基于layui+cropper.js实现上传图片的裁剪功能

　　最近因项目需求，需要在上传图片的时候先对图片裁剪，然后在上传，所以就有了本文的出现。

　　开始正文之前，要提一下这个图片的裁剪：图片的裁剪，有前端裁剪，也可以后端裁剪

　　前端的裁剪我知道的可以分为这么两种：flash一种，canvas一种。现在用的多的是canvas这种。

　　其实裁剪最本质的原理：通过工具获取到图片（不是JS那种获取DOM的方式，比如flash获取到图片，对图片任意操作，canvas也是一样，将图片放在画布上，任意操作）

　　本文使用的是canvas这种方式，借助的是cropper.js实现图片的裁剪，详细可以去官网看看，个人认为官网就是做好的demo。

　　官网http://fengyuanchen.github.io/cropper/ 
　　文档https://github.com/fengyuanchen/cropper/blob/master/README.md –v3.x版本

　　但是官方文档是英文的，英文不好的同学个人推荐一篇特别好的关于cropper的用法的说明，详细又易懂，特别适合新手

　　地址:https://blog.csdn.net/weixin_38023551/article/details/78792400

　　

　　说了这么多，接下来说正文，由于前端页面使用的是layui这个框架，所有使用cropper时，最好的能够将cropper这个包作为一个layui的扩展嵌入到layui中，这样都省事，嵌入很简单，具体可以参考下面我封装好的代码

　　备注：cropper默认裁剪后的图片格式为png格式，如果需要自定义上传图片的格式，可以参考下面这段代码，如果不需要请直接忽略

cropper修改上传图片的格式

var cas=imageEle.cropper('getCroppedCanvas');
var base64url=cas.toDataURL('image/jpeg');
console.log(base64url); //生成base64图片的格式

// 展示裁剪的图片的两种方式
// 方式一
$('.cavans').html(cas)  //在body显示出canvas元素

// 方式二
$('.canvans').attr("src", base64url);

 封装好的cropper源码如下，包括cropper-jQuery的

具体代码：

cropper-css

/*!
 * Cropper.js v1.4.3
 * https://fengyuanchen.github.io/cropperjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2018-10-24T13:07:11.429Z
 */

.cropper-container {
    direction: ltr;
    font-size: 0;
    line-height: 0;
    position: relative;
    -ms-touch-action: none;
    touch-action: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.cropper-container img {
    display: block;
    height: 100%;
    image-orientation: 0deg;
    max-height: none !important;
    max-width: none !important;
    min-height: 0 !important;
    min-width: 0 !important;
    width: 100%;
}

.cropper-wrap-box,
.cropper-canvas,
.cropper-drag-box,
.cropper-crop-box,
.cropper-modal {
    bottom: 0;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
}

.cropper-wrap-box,
.cropper-canvas {
    overflow: hidden;
}

.cropper-drag-box {
    background-color: #fff;
    opacity: 0;
}

.cropper-modal {
    background-color: #000;
    opacity: .5;
}

.cropper-view-box {
    display: block;
    height: 100%;
    outline-color: rgba(51, 153, 255, 0.75);
    outline: 1px solid #39f;
    overflow: hidden;
    width: 100%;
}

.cropper-dashed {
    border: 0 dashed #eee;
    display: block;
    opacity: .5;
    position: absolute;
}

.cropper-dashed.dashed-h {
    border-bottom-width: 1px;
    border-top-width: 1px;
    height: calc(100% / 3);
    left: 0;
    top: calc(100% / 3);
    width: 100%;
}

.cropper-dashed.dashed-v {
    border-left-width: 1px;
    border-right-width: 1px;
    height: 100%;
    left: calc(100% / 3);
    top: 0;
    width: calc(100% / 3);
}

.cropper-center {
    display: block;
    height: 0;
    left: 50%;
    opacity: .75;
    position: absolute;
    top: 50%;
    width: 0;
}

.cropper-center:before,
.cropper-center:after {
    background-color: #eee;
    content: ' ';
    display: block;
    position: absolute;
}

.cropper-center:before {
    height: 1px;
    left: -3px;
    top: 0;
    width: 7px;
}

.cropper-center:after {
    height: 7px;
    left: 0;
    top: -3px;
    width: 1px;
}

.cropper-face,
.cropper-line,
.cropper-point {
    display: block;
    height: 100%;
    opacity: .1;
    position: absolute;
    width: 100%;
}

.cropper-face {
    background-color: #fff;
    left: 0;
    top: 0;
}

.cropper-line {
    background-color: #39f;
}

.cropper-line.line-e {
    cursor: ew-resize;
    right: -3px;
    top: 0;
    width: 5px;
}

.cropper-line.line-n {
    cursor: ns-resize;
    height: 5px;
    left: 0;
    top: -3px;
}

.cropper-line.line-w {
    cursor: ew-resize;
    left: -3px;
    top: 0;
    width: 5px;
}

.cropper-line.line-s {
    bottom: -3px;
    cursor: ns-resize;
    height: 5px;
    left: 0;
}

.cropper-point {
    background-color: #39f;
    height: 5px;
    opacity: .75;
    width: 5px;
}

.cropper-point.point-e {
    cursor: ew-resize;
    margin-top: -3px;
    right: -3px;
    top: 50%;
}

.cropper-point.point-n {
    cursor: ns-resize;
    left: 50%;
    margin-left: -3px;
    top: -3px;
}

.cropper-point.point-w {
    cursor: ew-resize;
    left: -3px;
    margin-top: -3px;
    top: 50%;
}

.cropper-point.point-s {
    bottom: -3px;
    cursor: s-resize;
    left: 50%;
    margin-left: -3px;
}

.cropper-point.point-ne {
    cursor: nesw-resize;
    right: -3px;
    top: -3px;
}

.cropper-point.point-nw {
    cursor: nwse-resize;
    left: -3px;
    top: -3px;
}

.cropper-point.point-sw {
    bottom: -3px;
    cursor: nesw-resize;
    left: -3px;
}

.cropper-point.point-se {
    bottom: -3px;
    cursor: nwse-resize;
    height: 20px;
    opacity: 1;
    right: -3px;
    width: 20px;
}

@media (min-width: 768px) {
    .cropper-point.point-se {
        height: 15px;
        width: 15px;
    }
}

@media (min-width: 992px) {
    .cropper-point.point-se {
        height: 10px;
        width: 10px;
    }
}

@media (min-width: 1200px) {
    .cropper-point.point-se {
        height: 5px;
        opacity: .75;
        width: 5px;
    }
}

.cropper-point.point-se:before {
    background-color: #39f;
    bottom: -50%;
    content: ' ';
    display: block;
    height: 200%;
    opacity: 0;
    position: absolute;
    right: -50%;
    width: 200%;
}

.cropper-invisible {
    opacity: 0;
}

.cropper-bg {
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC');
}

.cropper-hide {
    display: block;
    height: 0;
    position: absolute;
    width: 0;
}

.cropper-hidden {
    display: none !important;
}

.cropper-move {
    cursor: move;
}

.cropper-crop {
    cursor: crosshair;
}

.cropper-disabled .cropper-drag-box,
.cropper-disabled .cropper-face,
.cropper-disabled .cropper-line,
.cropper-disabled .cropper-point {
    cursor: not-allowed;
}

cropper-js

/*!
 * Cropper.js v1.4.3
 * https://fengyuanchen.github.io/cropperjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2018-10-24T13:07:15.032Z
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            global.layui && layui.define ? layui.define(function (exports) {
                    exports('cropper', factory())
                }) :
                (global.Cropper = factory());
}(this, (function () {
    'use strict';

    function _typeof(obj) {
        if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
            _typeof = function (obj) {
                return typeof obj;
            };
        } else {
            _typeof = function (obj) {
                return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
            };
        }

        return _typeof(obj);
    }

    function _classCallCheck(instance, Constructor) {
        if (!(instance instanceof Constructor)) {
            throw new TypeError("Cannot call a class as a function");
        }
    }

    function _defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
            var descriptor = props[i];
            descriptor.enumerable = descriptor.enumerable || false;
            descriptor.configurable = true;
            if ("value" in descriptor) descriptor.writable = true;
            Object.defineProperty(target, descriptor.key, descriptor);
        }
    }

    function _createClass(Constructor, protoProps, staticProps) {
        if (protoProps) _defineProperties(Constructor.prototype, protoProps);
        if (staticProps) _defineProperties(Constructor, staticProps);
        return Constructor;
    }

    function _toConsumableArray(arr) {
        return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
    }

    function _arrayWithoutHoles(arr) {
        if (Array.isArray(arr)) {
            for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

            return arr2;
        }
    }

    function _iterableToArray(iter) {
        if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
    }

    function _nonIterableSpread() {
        throw new TypeError("Invalid attempt to spread non-iterable instance");
    }

    var IN_BROWSER = typeof window !== 'undefined';
    var WINDOW = IN_BROWSER ? window : {};
    var NAMESPACE = 'cropper'; // Actions

    var ACTION_ALL = 'all';
    var ACTION_CROP = 'crop';
    var ACTION_MOVE = 'move';
    var ACTION_ZOOM = 'zoom';
    var ACTION_EAST = 'e';
    var ACTION_WEST = 'w';
    var ACTION_SOUTH = 's';
    var ACTION_NORTH = 'n';
    var ACTION_NORTH_EAST = 'ne';
    var ACTION_NORTH_WEST = 'nw';
    var ACTION_SOUTH_EAST = 'se';
    var ACTION_SOUTH_WEST = 'sw'; // Classes

    var CLASS_CROP = "".concat(NAMESPACE, "-crop");
    var CLASS_DISABLED = "".concat(NAMESPACE, "-disabled");
    var CLASS_HIDDEN = "".concat(NAMESPACE, "-hidden");
    var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
    var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
    var CLASS_MODAL = "".concat(NAMESPACE, "-modal");
    var CLASS_MOVE = "".concat(NAMESPACE, "-move"); // Data keys

    var DATA_ACTION = "".concat(NAMESPACE, "Action");
    var DATA_PREVIEW = "".concat(NAMESPACE, "Preview"); // Drag modes

    var DRAG_MODE_CROP = 'crop';
    var DRAG_MODE_MOVE = 'move';
    var DRAG_MODE_NONE = 'none'; // Events

    var EVENT_CROP = 'crop';
    var EVENT_CROP_END = 'cropend';
    var EVENT_CROP_MOVE = 'cropmove';
    var EVENT_CROP_START = 'cropstart';
    var EVENT_DBLCLICK = 'dblclick';
    var EVENT_POINTER_DOWN = WINDOW.PointerEvent ? 'pointerdown' : 'touchstart mousedown';
    var EVENT_POINTER_MOVE = WINDOW.PointerEvent ? 'pointermove' : 'touchmove mousemove';
    var EVENT_POINTER_UP = WINDOW.PointerEvent ? 'pointerup pointercancel' : 'touchend touchcancel mouseup';
    var EVENT_READY = 'ready';
    var EVENT_RESIZE = 'resize';
    var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';
    var EVENT_ZOOM = 'zoom'; // Mime types

    var MIME_TYPE_JPEG = 'image/jpeg'; // RegExps

    var REGEXP_ACTIONS = /^(?:e|w|s|n|se|sw|ne|nw|all|crop|move|zoom)$/;
    var REGEXP_DATA_URL = /^data:/;
    var REGEXP_DATA_URL_JPEG = /^data:image\/jpeg;base64,/;
    var REGEXP_TAG_NAME = /^(?:img|canvas)$/i;

    var DEFAULTS = {
        // Define the view mode of the cropper
        viewMode: 0,
        // 0, 1, 2, 3
        // Define the dragging mode of the cropper
        dragMode: DRAG_MODE_CROP,
        // 'crop', 'move' or 'none'
        // Define the initial aspect ratio of the crop box
        initialAspectRatio: NaN,
        // Define the aspect ratio of the crop box
        aspectRatio: NaN,
        // An object with the previous cropping result data
        data: null,
        // A selector for adding extra containers to preview
        preview: '',
        // Re-render the cropper when resize the window
        responsive: true,
        // Restore the cropped area after resize the window
        restore: true,
        // Check if the current image is a cross-origin image
        checkCrossOrigin: false,
        // Check the current image's Exif Orientation information
        checkOrientation: true,
        // Show the black modal
        modal: true,
        // Show the dashed lines for guiding
        guides: true,
        // Show the center indicator for guiding
        center: true,
        // Show the white modal to highlight the crop box
        highlight: true,
        // Show the grid background
        background: true,
        // Enable to crop the image automatically when initialize
        autoCrop: true,
        // Define the percentage of automatic cropping area when initializes
        autoCropArea: 0.8,
        // Enable to move the image
        movable: true,
        // Enable to rotate the image
        rotatable: true,
        // Enable to scale the image
        scalable: true,
        // Enable to zoom the image
        zoomable: true,
        // Enable to zoom the image by dragging touch
        zoomOnTouch: true,
        // Enable to zoom the image by wheeling mouse
        zoomOnWheel: true,
        // Define zoom ratio when zoom the image by wheeling mouse
        wheelZoomRatio: 0.1,
        // Enable to move the crop box
        cropBoxMovable: true,
        // Enable to resize the crop box
        cropBoxResizable: true,
        // Toggle drag mode between "crop" and "move" when click twice on the cropper
        toggleDragModeOnDblclick: true,
        // Size limitation
        minCanvasWidth: 0,
        minCanvasHeight: 0,
        minCropBoxWidth: 0,
        minCropBoxHeight: 0,
        minContainerWidth: 200,
        minContainerHeight: 100,
        // Shortcuts of events
        ready: null,
        cropstart: null,
        cropmove: null,
        cropend: null,
        crop: null,
        zoom: null
    };

    var TEMPLATE = '<div class="cropper-container" touch-action="none">' + '<div class="cropper-wrap-box">' + '<div class="cropper-canvas"></div>' + '</div>' + '<div class="cropper-drag-box"></div>' + '<div class="cropper-crop-box">' + '<span class="cropper-view-box"></span>' + '<span class="cropper-dashed dashed-h"></span>' + '<span class="cropper-dashed dashed-v"></span>' + '<span class="cropper-center"></span>' + '<span class="cropper-face"></span>' + '<span class="cropper-line line-e" data-cropper-action="e"></span>' + '<span class="cropper-line line-n" data-cropper-action="n"></span>' + '<span class="cropper-line line-w" data-cropper-action="w"></span>' + '<span class="cropper-line line-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-e" data-cropper-action="e"></span>' + '<span class="cropper-point point-n" data-cropper-action="n"></span>' + '<span class="cropper-point point-w" data-cropper-action="w"></span>' + '<span class="cropper-point point-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-ne" data-cropper-action="ne"></span>' + '<span class="cropper-point point-nw" data-cropper-action="nw"></span>' + '<span class="cropper-point point-sw" data-cropper-action="sw"></span>' + '<span class="cropper-point point-se" data-cropper-action="se"></span>' + '</div>' + '</div>';

    /**
     * Check if the given value is not a number.
     */

    var isNaN = Number.isNaN || WINDOW.isNaN;

    /**
     * Check if the given value is a number.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a number, else `false`.
     */

    function isNumber(value) {
        return typeof value === 'number' && !isNaN(value);
    }

    /**
     * Check if the given value is undefined.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
     */

    function isUndefined(value) {
        return typeof value === 'undefined';
    }

    /**
     * Check if the given value is an object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is an object, else `false`.
     */

    function isObject(value) {
        return _typeof(value) === 'object' && value !== null;
    }

    var hasOwnProperty = Object.prototype.hasOwnProperty;

    /**
     * Check if the given value is a plain object.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
     */

    function isPlainObject(value) {
        if (!isObject(value)) {
            return false;
        }

        try {
            var _constructor = value.constructor;
            var prototype = _constructor.prototype;
            return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
        } catch (e) {
            return false;
        }
    }

    /**
     * Check if the given value is a function.
     * @param {*} value - The value to check.
     * @returns {boolean} Returns `true` if the given value is a function, else `false`.
     */

    function isFunction(value) {
        return typeof value === 'function';
    }

    /**
     * Iterate the given data.
     * @param {*} data - The data to iterate.
     * @param {Function} callback - The process function for each element.
     * @returns {*} The original data.
     */

    function forEach(data, callback) {
        if (data && isFunction(callback)) {
            if (Array.isArray(data) || isNumber(data.length)
            /* array-like */
            ) {
                var length = data.length;
                var i;

                for (i = 0; i < length; i += 1) {
                    if (callback.call(data, data[i], i, data) === false) {
                        break;
                    }
                }
            } else if (isObject(data)) {
                Object.keys(data).forEach(function (key) {
                    callback.call(data, data[key], key, data);
                });
            }
        }

        return data;
    }

    /**
     * Extend the given object.
     * @param {*} obj - The object to be extended.
     * @param {*} args - The rest objects which will be merged to the first object.
     * @returns {Object} The extended object.
     */

    var assign = Object.assign || function assign(obj) {
        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
            args[_key - 1] = arguments[_key];
        }

        if (isObject(obj) && args.length > 0) {
            args.forEach(function (arg) {
                if (isObject(arg)) {
                    Object.keys(arg).forEach(function (key) {
                        obj[key] = arg[key];
                    });
                }
            });
        }

        return obj;
    };
    var REGEXP_DECIMALS = /\.\d*(?:0|9){12}\d*$/;

    /**
     * Normalize decimal number.
     * Check out {@link http://0.30000000000000004.com/}
     * @param {number} value - The value to normalize.
     * @param {number} [times=100000000000] - The times for normalizing.
     * @returns {number} Returns the normalized number.
     */

    function normalizeDecimalNumber(value) {
        var times = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100000000000;
        return REGEXP_DECIMALS.test(value) ? Math.round(value * times) / times : value;
    }

    var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;

    /**
     * Apply styles to the given element.
     * @param {Element} element - The target element.
     * @param {Object} styles - The styles for applying.
     */

    function setStyle(element, styles) {
        var style = element.style;
        forEach(styles, function (value, property) {
            if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
                value += 'px';
            }

            style[property] = value;
        });
    }

    /**
     * Check if the given element has a special class.
     * @param {Element} element - The element to check.
     * @param {string} value - The class to search.
     * @returns {boolean} Returns `true` if the special class was found.
     */

    function hasClass(element, value) {
        return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
    }

    /**
     * Add classes to the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be added.
     */

    function addClass(element, value) {
        if (!value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                addClass(elem, value);
            });
            return;
        }

        if (element.classList) {
            element.classList.add(value);
            return;
        }

        var className = element.className.trim();

        if (!className) {
            element.className = value;
        } else if (className.indexOf(value) < 0) {
            element.className = "".concat(className, " ").concat(value);
        }
    }

    /**
     * Remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be removed.
     */

    function removeClass(element, value) {
        if (!value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                removeClass(elem, value);
            });
            return;
        }

        if (element.classList) {
            element.classList.remove(value);
            return;
        }

        if (element.className.indexOf(value) >= 0) {
            element.className = element.className.replace(value, '');
        }
    }

    /**
     * Add or remove classes from the given element.
     * @param {Element} element - The target element.
     * @param {string} value - The classes to be toggled.
     * @param {boolean} added - Add only.
     */

    function toggleClass(element, value, added) {
        if (!value) {
            return;
        }

        if (isNumber(element.length)) {
            forEach(element, function (elem) {
                toggleClass(elem, value, added);
            });
            return;
        } // IE10-11 doesn't support the second parameter of `classList.toggle`


        if (added) {
            addClass(element, value);
        } else {
            removeClass(element, value);
        }
    }

    var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;

    /**
     * Transform the given string from camelCase to kebab-case
     * @param {string} value - The value to transform.
     * @returns {string} The transformed value.
     */

    function hyphenate(value) {
        return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
    }

    /**
     * Get data from the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to get.
     * @returns {string} The data value.
     */

    function getData(element, name) {
        if (isObject(element[name])) {
            return element[name];
        }

        if (element.dataset) {
            return element.dataset[name];
        }

        return element.getAttribute("data-".concat(hyphenate(name)));
    }

    /**
     * Set data to the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to set.
     * @param {string} data - The data value.
     */

    function setData(element, name, data) {
        if (isObject(data)) {
            element[name] = data;
        } else if (element.dataset) {
            element.dataset[name] = data;
        } else {
            element.setAttribute("data-".concat(hyphenate(name)), data);
        }
    }

    /**
     * Remove data from the given element.
     * @param {Element} element - The target element.
     * @param {string} name - The data key to remove.
     */

    function removeData(element, name) {
        if (isObject(element[name])) {
            try {
                delete element[name];
            } catch (e) {
                element[name] = undefined;
            }
        } else if (element.dataset) {
            // #128 Safari not allows to delete dataset property
            try {
                delete element.dataset[name];
            } catch (e) {
                element.dataset[name] = undefined;
            }
        } else {
            element.removeAttribute("data-".concat(hyphenate(name)));
        }
    }

    var REGEXP_SPACES = /\s\s*/;

    var onceSupported = function () {
        var supported = false;

        if (IN_BROWSER) {
            var once = false;

            var listener = function listener() {
            };

            var options = Object.defineProperty({}, 'once', {
                get: function get() {
                    supported = true;
                    return once;
                },

                /**
                 * This setter can fix a `TypeError` in strict mode
                 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
                 * @param {boolean} value - The value to set
                 */
                set: function set(value) {
                    once = value;
                }
            });
            WINDOW.addEventListener('test', listener, options);
            WINDOW.removeEventListener('test', listener, options);
        }

        return supported;
    }();

    /**
     * Remove event listener from the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */


    function removeListener(element, type, listener) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        var handler = listener;
        type.trim().split(REGEXP_SPACES).forEach(function (event) {
            if (!onceSupported) {
                var listeners = element.listeners;

                if (listeners && listeners[event] && listeners[event][listener]) {
                    handler = listeners[event][listener];
                    delete listeners[event][listener];

                    if (Object.keys(listeners[event]).length === 0) {
                        delete listeners[event];
                    }

                    if (Object.keys(listeners).length === 0) {
                        delete element.listeners;
                    }
                }
            }

            element.removeEventListener(event, handler, options);
        });
    }

    /**
     * Add event listener to the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Function} listener - The event listener.
     * @param {Object} options - The event options.
     */

    function addListener(element, type, listener) {
        var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
        var _handler = listener;
        type.trim().split(REGEXP_SPACES).forEach(function (event) {
            if (options.once && !onceSupported) {
                var _element$listeners = element.listeners,
                    listeners = _element$listeners === void 0 ? {} : _element$listeners;

                _handler = function handler() {
                    delete listeners[event][listener];
                    element.removeEventListener(event, _handler, options);

                    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
                        args[_key2] = arguments[_key2];
                    }

                    listener.apply(element, args);
                };

                if (!listeners[event]) {
                    listeners[event] = {};
                }

                if (listeners[event][listener]) {
                    element.removeEventListener(event, listeners[event][listener], options);
                }

                listeners[event][listener] = _handler;
                element.listeners = listeners;
            }

            element.addEventListener(event, _handler, options);
        });
    }

    /**
     * Dispatch event on the target element.
     * @param {Element} element - The event target.
     * @param {string} type - The event type(s).
     * @param {Object} data - The additional event data.
     * @returns {boolean} Indicate if the event is default prevented or not.
     */

    function dispatchEvent(element, type, data) {
        var event; // Event and CustomEvent on IE9-11 are global objects, not constructors

        if (isFunction(Event) && isFunction(CustomEvent)) {
            event = new CustomEvent(type, {
                detail: data,
                bubbles: true,
                cancelable: true
            });
        } else {
            event = document.createEvent('CustomEvent');
            event.initCustomEvent(type, true, true, data);
        }

        return element.dispatchEvent(event);
    }

    /**
     * Get the offset base on the document.
     * @param {Element} element - The target element.
     * @returns {Object} The offset data.
     */

    function getOffset(element) {
        var box = element.getBoundingClientRect();
        return {
            left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
            top: box.top + (window.pageYOffset - document.documentElement.clientTop)
        };
    }

    var location = WINDOW.location;
    var REGEXP_ORIGINS = /^(https?:)\/\/([^:/?#]+):?(\d*)/i;

    /**
     * Check if the given URL is a cross origin URL.
     * @param {string} url - The target URL.
     * @returns {boolean} Returns `true` if the given URL is a cross origin URL, else `false`.
     */

    function isCrossOriginURL(url) {
        var parts = url.match(REGEXP_ORIGINS);
        return parts && (parts[1] !== location.protocol || parts[2] !== location.hostname || parts[3] !== location.port);
    }

    /**
     * Add timestamp to the given URL.
     * @param {string} url - The target URL.
     * @returns {string} The result URL.
     */

    function addTimestamp(url) {
        var timestamp = "timestamp=".concat(new Date().getTime());
        return url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp;
    }

    /**
     * Get transforms base on the given object.
     * @param {Object} obj - The target object.
     * @returns {string} A string contains transform values.
     */

    function getTransforms(_ref) {
        var rotate = _ref.rotate,
            scaleX = _ref.scaleX,
            scaleY = _ref.scaleY,
            translateX = _ref.translateX,
            translateY = _ref.translateY;
        var values = [];

        if (isNumber(translateX) && translateX !== 0) {
            values.push("translateX(".concat(translateX, "px)"));
        }

        if (isNumber(translateY) && translateY !== 0) {
            values.push("translateY(".concat(translateY, "px)"));
        } // Rotate should come first before scale to match orientation transform


        if (isNumber(rotate) && rotate !== 0) {
            values.push("rotate(".concat(rotate, "deg)"));
        }

        if (isNumber(scaleX) && scaleX !== 1) {
            values.push("scaleX(".concat(scaleX, ")"));
        }

        if (isNumber(scaleY) && scaleY !== 1) {
            values.push("scaleY(".concat(scaleY, ")"));
        }

        var transform = values.length ? values.join(' ') : 'none';
        return {
            WebkitTransform: transform,
            msTransform: transform,
            transform: transform
        };
    }

    /**
     * Get the max ratio of a group of pointers.
     * @param {string} pointers - The target pointers.
     * @returns {number} The result ratio.
     */

    function getMaxZoomRatio(pointers) {
        var pointers2 = assign({}, pointers);
        var ratios = [];
        forEach(pointers, function (pointer, pointerId) {
            delete pointers2[pointerId];
            forEach(pointers2, function (pointer2) {
                var x1 = Math.abs(pointer.startX - pointer2.startX);
                var y1 = Math.abs(pointer.startY - pointer2.startY);
                var x2 = Math.abs(pointer.endX - pointer2.endX);
                var y2 = Math.abs(pointer.endY - pointer2.endY);
                var z1 = Math.sqrt(x1 * x1 + y1 * y1);
                var z2 = Math.sqrt(x2 * x2 + y2 * y2);
                var ratio = (z2 - z1) / z1;
                ratios.push(ratio);
            });
        });
        ratios.sort(function (a, b) {
            return Math.abs(a) < Math.abs(b);
        });
        return ratios[0];
    }

    /**
     * Get a pointer from an event object.
     * @param {Object} event - The target event object.
     * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
     * @returns {Object} The result pointer contains start and/or end point coordinates.
     */

    function getPointer(_ref2, endOnly) {
        var pageX = _ref2.pageX,
            pageY = _ref2.pageY;
        var end = {
            endX: pageX,
            endY: pageY
        };
        return endOnly ? end : assign({
            startX: pageX,
            startY: pageY
        }, end);
    }

    /**
     * Get the center point coordinate of a group of pointers.
     * @param {Object} pointers - The target pointers.
     * @returns {Object} The center point coordinate.
     */

    function getPointersCenter(pointers) {
        var pageX = 0;
        var pageY = 0;
        var count = 0;
        forEach(pointers, function (_ref3) {
            var startX = _ref3.startX,
                startY = _ref3.startY;
            pageX += startX;
            pageY += startY;
            count += 1;
        });
        pageX /= count;
        pageY /= count;
        return {
            pageX: pageX,
            pageY: pageY
        };
    }

    /**
     * Check if the given value is a finite number.
     */

    var isFinite = Number.isFinite || WINDOW.isFinite;

    /**
     * Get the max sizes in a rectangle under the given aspect ratio.
     * @param {Object} data - The original sizes.
     * @param {string} [type='contain'] - The adjust type.
     * @returns {Object} The result sizes.
     */

    function getAdjustedSizes(_ref4) // or 'cover'
    {
        var aspectRatio = _ref4.aspectRatio,
            height = _ref4.height,
            width = _ref4.width;
        var type = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'contain';

        var isValidNumber = function isValidNumber(value) {
            return isFinite(value) && value > 0;
        };

        if (isValidNumber(width) && isValidNumber(height)) {
            var adjustedWidth = height * aspectRatio;

            if (type === 'contain' && adjustedWidth > width || type === 'cover' && adjustedWidth < width) {
                height = width / aspectRatio;
            } else {
                width = height * aspectRatio;
            }
        } else if (isValidNumber(width)) {
            height = width / aspectRatio;
        } else if (isValidNumber(height)) {
            width = height * aspectRatio;
        }

        return {
            width: width,
            height: height
        };
    }

    /**
     * Get the new sizes of a rectangle after rotated.
     * @param {Object} data - The original sizes.
     * @returns {Object} The result sizes.
     */

    function getRotatedSizes(_ref5) {
        var width = _ref5.width,
            height = _ref5.height,
            degree = _ref5.degree;
        degree = Math.abs(degree) % 180;

        if (degree === 90) {
            return {
                width: height,
                height: width
            };
        }

        var arc = degree % 90 * Math.PI / 180;
        var sinArc = Math.sin(arc);
        var cosArc = Math.cos(arc);
        var newWidth = width * cosArc + height * sinArc;
        var newHeight = width * sinArc + height * cosArc;
        return degree > 90 ? {
            width: newHeight,
            height: newWidth
        } : {
            width: newWidth,
            height: newHeight
        };
    }

    /**
     * Get a canvas which drew the given image.
     * @param {HTMLImageElement} image - The image for drawing.
     * @param {Object} imageData - The image data.
     * @param {Object} canvasData - The canvas data.
     * @param {Object} options - The options.
     * @returns {HTMLCanvasElement} The result canvas.
     */

    function getSourceCanvas(image, _ref6, _ref7, _ref8) {
        var imageAspectRatio = _ref6.aspectRatio,
            imageNaturalWidth = _ref6.naturalWidth,
            imageNaturalHeight = _ref6.naturalHeight,
            _ref6$rotate = _ref6.rotate,
            rotate = _ref6$rotate === void 0 ? 0 : _ref6$rotate,
            _ref6$scaleX = _ref6.scaleX,
            scaleX = _ref6$scaleX === void 0 ? 1 : _ref6$scaleX,
            _ref6$scaleY = _ref6.scaleY,
            scaleY = _ref6$scaleY === void 0 ? 1 : _ref6$scaleY;
        var aspectRatio = _ref7.aspectRatio,
            naturalWidth = _ref7.naturalWidth,
            naturalHeight = _ref7.naturalHeight;
        var _ref8$fillColor = _ref8.fillColor,
            fillColor = _ref8$fillColor === void 0 ? 'transparent' : _ref8$fillColor,
            _ref8$imageSmoothingE = _ref8.imageSmoothingEnabled,
            imageSmoothingEnabled = _ref8$imageSmoothingE === void 0 ? true : _ref8$imageSmoothingE,
            _ref8$imageSmoothingQ = _ref8.imageSmoothingQuality,
            imageSmoothingQuality = _ref8$imageSmoothingQ === void 0 ? 'low' : _ref8$imageSmoothingQ,
            _ref8$maxWidth = _ref8.maxWidth,
            maxWidth = _ref8$maxWidth === void 0 ? Infinity : _ref8$maxWidth,
            _ref8$maxHeight = _ref8.maxHeight,
            maxHeight = _ref8$maxHeight === void 0 ? Infinity : _ref8$maxHeight,
            _ref8$minWidth = _ref8.minWidth,
            minWidth = _ref8$minWidth === void 0 ? 0 : _ref8$minWidth,
            _ref8$minHeight = _ref8.minHeight,
            minHeight = _ref8$minHeight === void 0 ? 0 : _ref8$minHeight;
        var canvas = document.createElement('canvas');
        var context = canvas.getContext('2d');
        var maxSizes = getAdjustedSizes({
            aspectRatio: aspectRatio,
            width: maxWidth,
            height: maxHeight
        });
        var minSizes = getAdjustedSizes({
            aspectRatio: aspectRatio,
            width: minWidth,
            height: minHeight
        }, 'cover');
        var width = Math.min(maxSizes.width, Math.max(minSizes.width, naturalWidth));
        var height = Math.min(maxSizes.height, Math.max(minSizes.height, naturalHeight)); // Note: should always use image's natural sizes for drawing as
        // imageData.naturalWidth === canvasData.naturalHeight when rotate % 180 === 90

        var destMaxSizes = getAdjustedSizes({
            aspectRatio: imageAspectRatio,
            width: maxWidth,
            height: maxHeight
        });
        var destMinSizes = getAdjustedSizes({
            aspectRatio: imageAspectRatio,
            width: minWidth,
            height: minHeight
        }, 'cover');
        var destWidth = Math.min(destMaxSizes.width, Math.max(destMinSizes.width, imageNaturalWidth));
        var destHeight = Math.min(destMaxSizes.height, Math.max(destMinSizes.height, imageNaturalHeight));
        var params = [-destWidth / 2, -destHeight / 2, destWidth, destHeight];
        canvas.width = normalizeDecimalNumber(width);
        canvas.height = normalizeDecimalNumber(height);
        context.fillStyle = fillColor;
        context.fillRect(0, 0, width, height);
        context.save();
        context.translate(width / 2, height / 2);
        context.rotate(rotate * Math.PI / 180);
        context.scale(scaleX, scaleY);
        context.imageSmoothingEnabled = imageSmoothingEnabled;
        context.imageSmoothingQuality = imageSmoothingQuality;
        context.drawImage.apply(context, [image].concat(_toConsumableArray(params.map(function (param) {
            return Math.floor(normalizeDecimalNumber(param));
        }))));
        context.restore();
        return canvas;
    }

    var fromCharCode = String.fromCharCode;

    /**
     * Get string from char code in data view.
     * @param {DataView} dataView - The data view for read.
     * @param {number} start - The start index.
     * @param {number} length - The read length.
     * @returns {string} The read result.
     */

    function getStringFromCharCode(dataView, start, length) {
        var str = '';
        var i;
        length += start;

        for (i = start; i < length; i += 1) {
            str += fromCharCode(dataView.getUint8(i));
        }

        return str;
    }

    var REGEXP_DATA_URL_HEAD = /^data:.*,/;

    /**
     * Transform Data URL to array buffer.
     * @param {string} dataURL - The Data URL to transform.
     * @returns {ArrayBuffer} The result array buffer.
     */

    function dataURLToArrayBuffer(dataURL) {
        var base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, '');
        var binary = atob(base64);
        var arrayBuffer = new ArrayBuffer(binary.length);
        var uint8 = new Uint8Array(arrayBuffer);
        forEach(uint8, function (value, i) {
            uint8[i] = binary.charCodeAt(i);
        });
        return arrayBuffer;
    }

    /**
     * Transform array buffer to Data URL.
     * @param {ArrayBuffer} arrayBuffer - The array buffer to transform.
     * @param {string} mimeType - The mime type of the Data URL.
     * @returns {string} The result Data URL.
     */

    function arrayBufferToDataURL(arrayBuffer, mimeType) {
        var chunks = [];
        var chunkSize = 8192;
        var uint8 = new Uint8Array(arrayBuffer);

        while (uint8.length > 0) {
            chunks.push(fromCharCode.apply(void 0, _toConsumableArray(uint8.subarray(0, chunkSize))));
            uint8 = uint8.subarray(chunkSize);
        }

        return "data:".concat(mimeType, ";base64,").concat(btoa(chunks.join('')));
    }

    /**
     * Get orientation value from given array buffer.
     * @param {ArrayBuffer} arrayBuffer - The array buffer to read.
     * @returns {number} The read orientation value.
     */

    function resetAndGetOrientation(arrayBuffer) {
        var dataView = new DataView(arrayBuffer);
        var orientation; // Ignores range error when the image does not have correct Exif information

        try {
            var littleEndian;
            var app1Start;
            var ifdStart; // Only handle JPEG image (start by 0xFFD8)

            if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) {
                var length = dataView.byteLength;
                var offset = 2;

                while (offset + 1 < length) {
                    if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) {
                        app1Start = offset;
                        break;
                    }

                    offset += 1;
                }
            }

            if (app1Start) {
                var exifIDCode = app1Start + 4;
                var tiffOffset = app1Start + 10;

                if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
                    var endianness = dataView.getUint16(tiffOffset);
                    littleEndian = endianness === 0x4949;

                    if (littleEndian || endianness === 0x4D4D
                    /* bigEndian */
                    ) {
                        if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) {
                            var firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);

                            if (firstIFDOffset >= 0x00000008) {
                                ifdStart = tiffOffset + firstIFDOffset;
                            }
                        }
                    }
                }
            }

            if (ifdStart) {
                var _length = dataView.getUint16(ifdStart, littleEndian);

                var _offset;

                var i;

                for (i = 0; i < _length; i += 1) {
                    _offset = ifdStart + i * 12 + 2;

                    if (dataView.getUint16(_offset, littleEndian) === 0x0112
                    /* Orientation */
                    ) {
                        // 8 is the offset of the current tag's value
                        _offset += 8; // Get the original orientation value

                        orientation = dataView.getUint16(_offset, littleEndian); // Override the orientation with its default value

                        dataView.setUint16(_offset, 1, littleEndian);
                        break;
                    }
                }
            }
        } catch (e) {
            orientation = 1;
        }

        return orientation;
    }

    /**
     * Parse Exif Orientation value.
     * @param {number} orientation - The orientation to parse.
     * @returns {Object} The parsed result.
     */

    function parseOrientation(orientation) {
        var rotate = 0;
        var scaleX = 1;
        var scaleY = 1;

        switch (orientation) {
            // Flip horizontal
            case 2:
                scaleX = -1;
                break;
            // Rotate left 180°

            case 3:
                rotate = -180;
                break;
            // Flip vertical

            case 4:
                scaleY = -1;
                break;
            // Flip vertical and rotate right 90°

            case 5:
                rotate = 90;
                scaleY = -1;
                break;
            // Rotate right 90°

            case 6:
                rotate = 90;
                break;
            // Flip horizontal and rotate right 90°

            case 7:
                rotate = 90;
                scaleX = -1;
                break;
            // Rotate left 90°

            case 8:
                rotate = -90;
                break;

            default:
        }

        return {
            rotate: rotate,
            scaleX: scaleX,
            scaleY: scaleY
        };
    }

    var render = {
        render: function render() {
            this.initContainer();
            this.initCanvas();
            this.initCropBox();
            this.renderCanvas();

            if (this.cropped) {
                this.renderCropBox();
            }
        },
        initContainer: function initContainer() {
            var element = this.element,
                options = this.options,
                container = this.container,
                cropper = this.cropper;
            addClass(cropper, CLASS_HIDDEN);
            removeClass(element, CLASS_HIDDEN);
            var containerData = {
                width: Math.max(container.offsetWidth, Number(options.minContainerWidth) || 200),
                height: Math.max(container.offsetHeight, Number(options.minContainerHeight) || 100)
            };
            this.containerData = containerData;
            setStyle(cropper, {
                width: containerData.width,
                height: containerData.height
            });
            addClass(element, CLASS_HIDDEN);
            removeClass(cropper, CLASS_HIDDEN);
        },
        // Canvas (image wrapper)
        initCanvas: function initCanvas() {
            var containerData = this.containerData,
                imageData = this.imageData;
            var viewMode = this.options.viewMode;
            var rotated = Math.abs(imageData.rotate) % 180 === 90;
            var naturalWidth = rotated ? imageData.naturalHeight : imageData.naturalWidth;
            var naturalHeight = rotated ? imageData.naturalWidth : imageData.naturalHeight;
            var aspectRatio = naturalWidth / naturalHeight;
            var canvasWidth = containerData.width;
            var canvasHeight = containerData.height;

            if (containerData.height * aspectRatio > containerData.width) {
                if (viewMode === 3) {
                    canvasWidth = containerData.height * aspectRatio;
                } else {
                    canvasHeight = containerData.width / aspectRatio;
                }
            } else if (viewMode === 3) {
                canvasHeight = containerData.width / aspectRatio;
            } else {
                canvasWidth = containerData.height * aspectRatio;
            }

            var canvasData = {
                aspectRatio: aspectRatio,
                naturalWidth: naturalWidth,
                naturalHeight: naturalHeight,
                width: canvasWidth,
                height: canvasHeight
            };
            canvasData.left = (containerData.width - canvasWidth) / 2;
            canvasData.top = (containerData.height - canvasHeight) / 2;
            canvasData.oldLeft = canvasData.left;
            canvasData.oldTop = canvasData.top;
            this.canvasData = canvasData;
            this.limited = viewMode === 1 || viewMode === 2;
            this.limitCanvas(true, true);
            this.initialImageData = assign({}, imageData);
            this.initialCanvasData = assign({}, canvasData);
        },
        limitCanvas: function limitCanvas(sizeLimited, positionLimited) {
            var options = this.options,
                containerData = this.containerData,
                canvasData = this.canvasData,
                cropBoxData = this.cropBoxData;
            var viewMode = options.viewMode;
            var aspectRatio = canvasData.aspectRatio;
            var cropped = this.cropped && cropBoxData;

            if (sizeLimited) {
                var minCanvasWidth = Number(options.minCanvasWidth) || 0;
                var minCanvasHeight = Number(options.minCanvasHeight) || 0;

                if (viewMode > 1) {
                    minCanvasWidth = Math.max(minCanvasWidth, containerData.width);
                    minCanvasHeight = Math.max(minCanvasHeight, containerData.height);

                    if (viewMode === 3) {
                        if (minCanvasHeight * aspectRatio > minCanvasWidth) {
                            minCanvasWidth = minCanvasHeight * aspectRatio;
                        } else {
                            minCanvasHeight = minCanvasWidth / aspectRatio;
                        }
                    }
                } else if (viewMode > 0) {
                    if (minCanvasWidth) {
                        minCanvasWidth = Math.max(minCanvasWidth, cropped ? cropBoxData.width : 0);
                    } else if (minCanvasHeight) {
                        minCanvasHeight = Math.max(minCanvasHeight, cropped ? cropBoxData.height : 0);
                    } else if (cropped) {
                        minCanvasWidth = cropBoxData.width;
                        minCanvasHeight = cropBoxData.height;

                        if (minCanvasHeight * aspectRatio > minCanvasWidth) {
                            minCanvasWidth = minCanvasHeight * aspectRatio;
                        } else {
                            minCanvasHeight = minCanvasWidth / aspectRatio;
                        }
                    }
                }

                var _getAdjustedSizes = getAdjustedSizes({
                    aspectRatio: aspectRatio,
                    width: minCanvasWidth,
                    height: minCanvasHeight
                });

                minCanvasWidth = _getAdjustedSizes.width;
                minCanvasHeight = _getAdjustedSizes.height;
                canvasData.minWidth = minCanvasWidth;
                canvasData.minHeight = minCanvasHeight;
                canvasData.maxWidth = Infinity;
                canvasData.maxHeight = Infinity;
            }

            if (positionLimited) {
                if (viewMode > (cropped ? 0 : 1)) {
                    var newCanvasLeft = containerData.width - canvasData.width;
                    var newCanvasTop = containerData.height - canvasData.height;
                    canvasData.minLeft = Math.min(0, newCanvasLeft);
                    canvasData.minTop = Math.min(0, newCanvasTop);
                    canvasData.maxLeft = Math.max(0, newCanvasLeft);
                    canvasData.maxTop = Math.max(0, newCanvasTop);

                    if (cropped && this.limited) {
                        canvasData.minLeft = Math.min(cropBoxData.left, cropBoxData.left + (cropBoxData.width - canvasData.width));
                        canvasData.minTop = Math.min(cropBoxData.top, cropBoxData.top + (cropBoxData.height - canvasData.height));
                        canvasData.maxLeft = cropBoxData.left;
                        canvasData.maxTop = cropBoxData.top;

                        if (viewMode === 2) {
                            if (canvasData.width >= containerData.width) {
                                canvasData.minLeft = Math.min(0, newCanvasLeft);
                                canvasData.maxLeft = Math.max(0, newCanvasLeft);
                            }

                            if (canvasData.height >= containerData.height) {
                                canvasData.minTop = Math.min(0, newCanvasTop);
                                canvasData.maxTop = Math.max(0, newCanvasTop);
                            }
                        }
                    }
                } else {
                    canvasData.minLeft = -canvasData.width;
                    canvasData.minTop = -canvasData.height;
                    canvasData.maxLeft = containerData.width;
                    canvasData.maxTop = containerData.height;
                }
            }
        },
        renderCanvas: function renderCanvas(changed, transformed) {
            var canvasData = this.canvasData,
                imageData = this.imageData;

            if (transformed) {
                var _getRotatedSizes = getRotatedSizes({
                        width: imageData.naturalWidth * Math.abs(imageData.scaleX || 1),
                        height: imageData.naturalHeight * Math.abs(imageData.scaleY || 1),
                        degree: imageData.rotate || 0
                    }),
                    naturalWidth = _getRotatedSizes.width,
                    naturalHeight = _getRotatedSizes.height;

                var width = canvasData.width * (naturalWidth / canvasData.naturalWidth);
                var height = canvasData.height * (naturalHeight / canvasData.naturalHeight);
                canvasData.left -= (width - canvasData.width) / 2;
                canvasData.top -= (height - canvasData.height) / 2;
                canvasData.width = width;
                canvasData.height = height;
                canvasData.aspectRatio = naturalWidth / naturalHeight;
                canvasData.naturalWidth = naturalWidth;
                canvasData.naturalHeight = naturalHeight;
                this.limitCanvas(true, false);
            }

            if (canvasData.width > canvasData.maxWidth || canvasData.width < canvasData.minWidth) {
                canvasData.left = canvasData.oldLeft;
            }

            if (canvasData.height > canvasData.maxHeight || canvasData.height < canvasData.minHeight) {
                canvasData.top = canvasData.oldTop;
            }

            canvasData.width = Math.min(Math.max(canvasData.width, canvasData.minWidth), canvasData.maxWidth);
            canvasData.height = Math.min(Math.max(canvasData.height, canvasData.minHeight), canvasData.maxHeight);
            this.limitCanvas(false, true);
            canvasData.left = Math.min(Math.max(canvasData.left, canvasData.minLeft), canvasData.maxLeft);
            canvasData.top = Math.min(Math.max(canvasData.top, canvasData.minTop), canvasData.maxTop);
            canvasData.oldLeft = canvasData.left;
            canvasData.oldTop = canvasData.top;
            setStyle(this.canvas, assign({
                width: canvasData.width,
                height: canvasData.height
            }, getTransforms({
                translateX: canvasData.left,
                translateY: canvasData.top
            })));
            this.renderImage(changed);

            if (this.cropped && this.limited) {
                this.limitCropBox(true, true);
            }
        },
        renderImage: function renderImage(changed) {
            var canvasData = this.canvasData,
                imageData = this.imageData;
            var width = imageData.naturalWidth * (canvasData.width / canvasData.naturalWidth);
            var height = imageData.naturalHeight * (canvasData.height / canvasData.naturalHeight);
            assign(imageData, {
                width: width,
                height: height,
                left: (canvasData.width - width) / 2,
                top: (canvasData.height - height) / 2
            });
            setStyle(this.image, assign({
                width: imageData.width,
                height: imageData.height
            }, getTransforms(assign({
                translateX: imageData.left,
                translateY: imageData.top
            }, imageData))));

            if (changed) {
                this.output();
            }
        },
        initCropBox: function initCropBox() {
            var options = this.options,
                canvasData = this.canvasData;
            var aspectRatio = options.aspectRatio || options.initialAspectRatio;
            var autoCropArea = Number(options.autoCropArea) || 0.8;
            var cropBoxData = {
                width: canvasData.width,
                height: canvasData.height
            };

            if (aspectRatio) {
                if (canvasData.height * aspectRatio > canvasData.width) {
                    cropBoxData.height = cropBoxData.width / aspectRatio;
                } else {
                    cropBoxData.width = cropBoxData.height * aspectRatio;
                }
            }

            this.cropBoxData = cropBoxData;
            this.limitCropBox(true, true); // Initialize auto crop area

            cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth);
            cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight); // The width/height of auto crop area must large than "minWidth/Height"

            cropBoxData.width = Math.max(cropBoxData.minWidth, cropBoxData.width * autoCropArea);
            cropBoxData.height = Math.max(cropBoxData.minHeight, cropBoxData.height * autoCropArea);
            cropBoxData.left = canvasData.left + (canvasData.width - cropBoxData.width) / 2;
            cropBoxData.top = canvasData.top + (canvasData.height - cropBoxData.height) / 2;
            cropBoxData.oldLeft = cropBoxData.left;
            cropBoxData.oldTop = cropBoxData.top;
            this.initialCropBoxData = assign({}, cropBoxData);
        },
        limitCropBox: function limitCropBox(sizeLimited, positionLimited) {
            var options = this.options,
                containerData = this.containerData,
                canvasData = this.canvasData,
                cropBoxData = this.cropBoxData,
                limited = this.limited;
            var aspectRatio = options.aspectRatio;

            if (sizeLimited) {
                var minCropBoxWidth = Number(options.minCropBoxWidth) || 0;
                var minCropBoxHeight = Number(options.minCropBoxHeight) || 0;
                var maxCropBoxWidth = limited ? Math.min(containerData.width, canvasData.width, canvasData.width + canvasData.left, containerData.width - canvasData.left) : containerData.width;
                var maxCropBoxHeight = limited ? Math.min(containerData.height, canvasData.height, canvasData.height + canvasData.top, containerData.height - canvasData.top) : containerData.height; // The min/maxCropBoxWidth/Height must be less than container's width/height

                minCropBoxWidth = Math.min(minCropBoxWidth, containerData.width);
                minCropBoxHeight = Math.min(minCropBoxHeight, containerData.height);

                if (aspectRatio) {
                    if (minCropBoxWidth && minCropBoxHeight) {
                        if (minCropBoxHeight * aspectRatio > minCropBoxWidth) {
                            minCropBoxHeight = minCropBoxWidth / aspectRatio;
                        } else {
                            minCropBoxWidth = minCropBoxHeight * aspectRatio;
                        }
                    } else if (minCropBoxWidth) {
                        minCropBoxHeight = minCropBoxWidth / aspectRatio;
                    } else if (minCropBoxHeight) {
                        minCropBoxWidth = minCropBoxHeight * aspectRatio;
                    }

                    if (maxCropBoxHeight * aspectRatio > maxCropBoxWidth) {
                        maxCropBoxHeight = maxCropBoxWidth / aspectRatio;
                    } else {
                        maxCropBoxWidth = maxCropBoxHeight * aspectRatio;
                    }
                } // The minWidth/Height must be less than maxWidth/Height


                cropBoxData.minWidth = Math.min(minCropBoxWidth, maxCropBoxWidth);
                cropBoxData.minHeight = Math.min(minCropBoxHeight, maxCropBoxHeight);
                cropBoxData.maxWidth = maxCropBoxWidth;
                cropBoxData.maxHeight = maxCropBoxHeight;
            }

            if (positionLimited) {
                if (limited) {
                    cropBoxData.minLeft = Math.max(0, canvasData.left);
                    cropBoxData.minTop = Math.max(0, canvasData.top);
                    cropBoxData.maxLeft = Math.min(containerData.width, canvasData.left + canvasData.width) - cropBoxData.width;
                    cropBoxData.maxTop = Math.min(containerData.height, canvasData.top + canvasData.height) - cropBoxData.height;
                } else {
                    cropBoxData.minLeft = 0;
                    cropBoxData.minTop = 0;
                    cropBoxData.maxLeft = containerData.width - cropBoxData.width;
                    cropBoxData.maxTop = containerData.height - cropBoxData.height;
                }
            }
        },
        renderCropBox: function renderCropBox() {
            var options = this.options,
                containerData = this.containerData,
                cropBoxData = this.cropBoxData;

            if (cropBoxData.width > cropBoxData.maxWidth || cropBoxData.width < cropBoxData.minWidth) {
                cropBoxData.left = cropBoxData.oldLeft;
            }

            if (cropBoxData.height > cropBoxData.maxHeight || cropBoxData.height < cropBoxData.minHeight) {
                cropBoxData.top = cropBoxData.oldTop;
            }

            cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth);
            cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight);
            this.limitCropBox(false, true);
            cropBoxData.left = Math.min(Math.max(cropBoxData.left, cropBoxData.minLeft), cropBoxData.maxLeft);
            cropBoxData.top = Math.min(Math.max(cropBoxData.top, cropBoxData.minTop), cropBoxData.maxTop);
            cropBoxData.oldLeft = cropBoxData.left;
            cropBoxData.oldTop = cropBoxData.top;

            if (options.movable && options.cropBoxMovable) {
                // Turn to move the canvas when the crop box is equal to the container
                setData(this.face, DATA_ACTION, cropBoxData.width >= containerData.width && cropBoxData.height >= containerData.height ? ACTION_MOVE : ACTION_ALL);
            }

            setStyle(this.cropBox, assign({
                width: cropBoxData.width,
                height: cropBoxData.height
            }, getTransforms({
                translateX: cropBoxData.left,
                translateY: cropBoxData.top
            })));

            if (this.cropped && this.limited) {
                this.limitCanvas(true, true);
            }

            if (!this.disabled) {
                this.output();
            }
        },
        output: function output() {
            this.preview();
            dispatchEvent(this.element, EVENT_CROP, this.getData());
        }
    };

    var preview = {
        initPreview: function initPreview() {
            var crossOrigin = this.crossOrigin;
            var preview = this.options.preview;
            var url = crossOrigin ? this.crossOriginUrl : this.url;
            var image = document.createElement('img');

            if (crossOrigin) {
                image.crossOrigin = crossOrigin;
            }

            image.src = url;
            this.viewBox.appendChild(image);
            this.viewBoxImage = image;

            if (!preview) {
                return;
            }

            var previews = preview;

            if (typeof preview === 'string') {
                previews = this.element.ownerDocument.querySelectorAll(preview);
            } else if (preview.querySelector) {
                previews = [preview];
            }

            this.previews = previews;
            forEach(previews, function (el) {
                var img = document.createElement('img'); // Save the original size for recover

                setData(el, DATA_PREVIEW, {
                    width: el.offsetWidth,
                    height: el.offsetHeight,
                    html: el.innerHTML
                });

                if (crossOrigin) {
                    img.crossOrigin = crossOrigin;
                }

                img.src = url;
                /**
                 * Override img element styles
                 * Add `display:block` to avoid margin top issue
                 * Add `height:auto` to override `height` attribute on IE8
                 * (Occur only when margin-top <= -height)
                 */

                img.style.cssText = 'display:block;' + 'width:100%;' + 'height:auto;' + 'min-width:0!important;' + 'min-height:0!important;' + 'max-width:none!important;' + 'max-height:none!important;' + 'image-orientation:0deg!important;"';
                el.innerHTML = '';
                el.appendChild(img);
            });
        },
        resetPreview: function resetPreview() {
            forEach(this.previews, function (element) {
                var data = getData(element, DATA_PREVIEW);
                setStyle(element, {
                    width: data.width,
                    height: data.height
                });
                element.innerHTML = data.html;
                removeData(element, DATA_PREVIEW);
            });
        },
        preview: function preview() {
            var imageData = this.imageData,
                canvasData = this.canvasData,
                cropBoxData = this.cropBoxData;
            var cropBoxWidth = cropBoxData.width,
                cropBoxHeight = cropBoxData.height;
            var width = imageData.width,
                height = imageData.height;
            var left = cropBoxData.left - canvasData.left - imageData.left;
            var top = cropBoxData.top - canvasData.top - imageData.top;

            if (!this.cropped || this.disabled) {
                return;
            }

            setStyle(this.viewBoxImage, assign({
                width: width,
                height: height
            }, getTransforms(assign({
                translateX: -left,
                translateY: -top
            }, imageData))));
            forEach(this.previews, function (element) {
                var data = getData(element, DATA_PREVIEW);
                var originalWidth = data.width;
                var originalHeight = data.height;
                var newWidth = originalWidth;
                var newHeight = originalHeight;
                var ratio = 1;

                if (cropBoxWidth) {
                    ratio = originalWidth / cropBoxWidth;
                    newHeight = cropBoxHeight * ratio;
                }

                if (cropBoxHeight && newHeight > originalHeight) {
                    ratio = originalHeight / cropBoxHeight;
                    newWidth = cropBoxWidth * ratio;
                    newHeight = originalHeight;
                }

                setStyle(element, {
                    width: newWidth,
                    height: newHeight
                });
                setStyle(element.getElementsByTagName('img')[0], assign({
                    width: width * ratio,
                    height: height * ratio
                }, getTransforms(assign({
                    translateX: -left * ratio,
                    translateY: -top * ratio
                }, imageData))));
            });
        }
    };

    var events = {
        bind: function bind() {
            var element = this.element,
                options = this.options,
                cropper = this.cropper;

            if (isFunction(options.cropstart)) {
                addListener(element, EVENT_CROP_START, options.cropstart);
            }

            if (isFunction(options.cropmove)) {
                addListener(element, EVENT_CROP_MOVE, options.cropmove);
            }

            if (isFunction(options.cropend)) {
                addListener(element, EVENT_CROP_END, options.cropend);
            }

            if (isFunction(options.crop)) {
                addListener(element, EVENT_CROP, options.crop);
            }

            if (isFunction(options.zoom)) {
                addListener(element, EVENT_ZOOM, options.zoom);
            }

            addListener(cropper, EVENT_POINTER_DOWN, this.onCropStart = this.cropStart.bind(this));

            if (options.zoomable && options.zoomOnWheel) {
                addListener(cropper, EVENT_WHEEL, this.onWheel = this.wheel.bind(this));
            }

            if (options.toggleDragModeOnDblclick) {
                addListener(cropper, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
            }

            addListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onCropMove = this.cropMove.bind(this));
            addListener(element.ownerDocument, EVENT_POINTER_UP, this.onCropEnd = this.cropEnd.bind(this));

            if (options.responsive) {
                addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));
            }
        },
        unbind: function unbind() {
            var element = this.element,
                options = this.options,
                cropper = this.cropper;

            if (isFunction(options.cropstart)) {
                removeListener(element, EVENT_CROP_START, options.cropstart);
            }

            if (isFunction(options.cropmove)) {
                removeListener(element, EVENT_CROP_MOVE, options.cropmove);
            }

            if (isFunction(options.cropend)) {
                removeListener(element, EVENT_CROP_END, options.cropend);
            }

            if (isFunction(options.crop)) {
                removeListener(element, EVENT_CROP, options.crop);
            }

            if (isFunction(options.zoom)) {
                removeListener(element, EVENT_ZOOM, options.zoom);
            }

            removeListener(cropper, EVENT_POINTER_DOWN, this.onCropStart);

            if (options.zoomable && options.zoomOnWheel) {
                removeListener(cropper, EVENT_WHEEL, this.onWheel);
            }

            if (options.toggleDragModeOnDblclick) {
                removeListener(cropper, EVENT_DBLCLICK, this.onDblclick);
            }

            removeListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onCropMove);
            removeListener(element.ownerDocument, EVENT_POINTER_UP, this.onCropEnd);

            if (options.responsive) {
                removeListener(window, EVENT_RESIZE, this.onResize);
            }
        }
    };

    var handlers = {
        resize: function resize() {
            var options = this.options,
                container = this.container,
                containerData = this.containerData;
            var minContainerWidth = Number(options.minContainerWidth) || 200;
            var minContainerHeight = Number(options.minContainerHeight) || 100;

            if (this.disabled || containerData.width <= minContainerWidth || containerData.height <= minContainerHeight) {
                return;
            }

            var ratio = container.offsetWidth / containerData.width; // Resize when width changed or height changed

            if (ratio !== 1 || container.offsetHeight !== containerData.height) {
                var canvasData;
                var cropBoxData;

                if (options.restore) {
                    canvasData = this.getCanvasData();
                    cropBoxData = this.getCropBoxData();
                }

                this.render();

                if (options.restore) {
                    this.setCanvasData(forEach(canvasData, function (n, i) {
                        canvasData[i] = n * ratio;
                    }));
                    this.setCropBoxData(forEach(cropBoxData, function (n, i) {
                        cropBoxData[i] = n * ratio;
                    }));
                }
            }
        },
        dblclick: function dblclick() {
            if (this.disabled || this.options.dragMode === DRAG_MODE_NONE) {
                return;
            }

            this.setDragMode(hasClass(this.dragBox, CLASS_CROP) ? DRAG_MODE_MOVE : DRAG_MODE_CROP);
        },
        wheel: function wheel(e) {
            var _this = this;

            var ratio = Number(this.options.wheelZoomRatio) || 0.1;
            var delta = 1;

            if (this.disabled) {
                return;
            }

            e.preventDefault(); // Limit wheel speed to prevent zoom too fast (#21)

            if (this.wheeling) {
                return;
            }

            this.wheeling = true;
            setTimeout(function () {
                _this.wheeling = false;
            }, 50);

            if (e.deltaY) {
                delta = e.deltaY > 0 ? 1 : -1;
            } else if (e.wheelDelta) {
                delta = -e.wheelDelta / 120;
            } else if (e.detail) {
                delta = e.detail > 0 ? 1 : -1;
            }

            this.zoom(-delta * ratio, e);
        },
        cropStart: function cropStart(e) {
            if (this.disabled) {
                return;
            }

            var options = this.options,
                pointers = this.pointers;
            var action;

            if (e.changedTouches) {
                // Handle touch event
                forEach(e.changedTouches, function (touch) {
                    pointers[touch.identifier] = getPointer(touch);
                });
            } else {
                // Handle mouse event and pointer event
                pointers[e.pointerId || 0] = getPointer(e);
            }

            if (Object.keys(pointers).length > 1 && options.zoomable && options.zoomOnTouch) {
                action = ACTION_ZOOM;
            } else {
                action = getData(e.target, DATA_ACTION);
            }

            if (!REGEXP_ACTIONS.test(action)) {
                return;
            }

            if (dispatchEvent(this.element, EVENT_CROP_START, {
                    originalEvent: e,
                    action: action
                }) === false) {
                return;
            } // This line is required for preventing page zooming in iOS browsers


            e.preventDefault();
            this.action = action;
            this.cropping = false;

            if (action === ACTION_CROP) {
                this.cropping = true;
                addClass(this.dragBox, CLASS_MODAL);
            }
        },
        cropMove: function cropMove(e) {
            var action = this.action;

            if (this.disabled || !action) {
                return;
            }

            var pointers = this.pointers;
            e.preventDefault();

            if (dispatchEvent(this.element, EVENT_CROP_MOVE, {
                    originalEvent: e,
                    action: action
                }) === false) {
                return;
            }

            if (e.changedTouches) {
                forEach(e.changedTouches, function (touch) {
                    // The first parameter should not be undefined (#432)
                    assign(pointers[touch.identifier] || {}, getPointer(touch, true));
                });
            } else {
                assign(pointers[e.pointerId || 0] || {}, getPointer(e, true));
            }

            this.change(e);
        },
        cropEnd: function cropEnd(e) {
            if (this.disabled) {
                return;
            }

            var action = this.action,
                pointers = this.pointers;

            if (e.changedTouches) {
                forEach(e.changedTouches, function (touch) {
                    delete pointers[touch.identifier];
                });
            } else {
                delete pointers[e.pointerId || 0];
            }

            if (!action) {
                return;
            }

            e.preventDefault();

            if (!Object.keys(pointers).length) {
                this.action = '';
            }

            if (this.cropping) {
                this.cropping = false;
                toggleClass(this.dragBox, CLASS_MODAL, this.cropped && this.options.modal);
            }

            dispatchEvent(this.element, EVENT_CROP_END, {
                originalEvent: e,
                action: action
            });
        }
    };

    var change = {
        change: function change(e) {
            var options = this.options,
                canvasData = this.canvasData,
                containerData = this.containerData,
                cropBoxData = this.cropBoxData,
                pointers = this.pointers;
            var action = this.action;
            var aspectRatio = options.aspectRatio;
            var left = cropBoxData.left,
                top = cropBoxData.top,
                width = cropBoxData.width,
                height = cropBoxData.height;
            var right = left + width;
            var bottom = top + height;
            var minLeft = 0;
            var minTop = 0;
            var maxWidth = containerData.width;
            var maxHeight = containerData.height;
            var renderable = true;
            var offset; // Locking aspect ratio in "free mode" by holding shift key

            if (!aspectRatio && e.shiftKey) {
                aspectRatio = width && height ? width / height : 1;
            }

            if (this.limited) {
                minLeft = cropBoxData.minLeft;
                minTop = cropBoxData.minTop;
                maxWidth = minLeft + Math.min(containerData.width, canvasData.width, canvasData.left + canvasData.width);
                maxHeight = minTop + Math.min(containerData.height, canvasData.height, canvasData.top + canvasData.height);
            }

            var pointer = pointers[Object.keys(pointers)[0]];
            var range = {
                x: pointer.endX - pointer.startX,
                y: pointer.endY - pointer.startY
            };

            var check = function check(side) {
                switch (side) {
                    case ACTION_EAST:
                        if (right + range.x > maxWidth) {
                            range.x = maxWidth - right;
                        }

                        break;

                    case ACTION_WEST:
                        if (left + range.x < minLeft) {
                            range.x = minLeft - left;
                        }

                        break;

                    case ACTION_NORTH:
                        if (top + range.y < minTop) {
                            range.y = minTop - top;
                        }

                        break;

                    case ACTION_SOUTH:
                        if (bottom + range.y > maxHeight) {
                            range.y = maxHeight - bottom;
                        }

                        break;

                    default:
                }
            };

            switch (action) {
                // Move crop box
                case ACTION_ALL:
                    left += range.x;
                    top += range.y;
                    break;
                // Resize crop box

                case ACTION_EAST:
                    if (range.x >= 0 && (right >= maxWidth || aspectRatio && (top <= minTop || bottom >= maxHeight))) {
                        renderable = false;
                        break;
                    }

                    check(ACTION_EAST);
                    width += range.x;

                    if (width < 0) {
                        action = ACTION_WEST;
                        width = -width;
                        left -= width;
                    }

                    if (aspectRatio) {
                        height = width / aspectRatio;
                        top += (cropBoxData.height - height) / 2;
                    }

                    break;

                case ACTION_NORTH:
                    if (range.y <= 0 && (top <= minTop || aspectRatio && (left <= minLeft || right >= maxWidth))) {
                        renderable = false;
                        break;
                    }

                    check(ACTION_NORTH);
                    height -= range.y;
                    top += range.y;

                    if (height < 0) {
                        action = ACTION_SOUTH;
                        height = -height;
                        top -= height;
                    }

                    if (aspectRatio) {
                        width = height * aspectRatio;
                        left += (cropBoxData.width - width) / 2;
                    }

                    break;

                case ACTION_WEST:
                    if (range.x <= 0 && (left <= minLeft || aspectRatio && (top <= minTop || bottom >= maxHeight))) {
                        renderable = false;
                        break;
                    }

                    check(ACTION_WEST);
                    width -= range.x;
                    left += range.x;

                    if (width < 0) {
                        action = ACTION_EAST;
                        width = -width;
                        left -= width;
                    }

                    if (aspectRatio) {
                        height = width / aspectRatio;
                        top += (cropBoxData.height - height) / 2;
                    }

                    break;

                case ACTION_SOUTH:
                    if (range.y >= 0 && (bottom >= maxHeight || aspectRatio && (left <= minLeft || right >= maxWidth))) {
                        renderable = false;
                        break;
                    }

                    check(ACTION_SOUTH);
                    height += range.y;

                    if (height < 0) {
                        action = ACTION_NORTH;
                        height = -height;
                        top -= height;
                    }

                    if (aspectRatio) {
                        width = height * aspectRatio;
                        left += (cropBoxData.width - width) / 2;
                    }

                    break;

                case ACTION_NORTH_EAST:
                    if (aspectRatio) {
                        if (range.y <= 0 && (top <= minTop || right >= maxWidth)) {
                            renderable = false;
                            break;
                        }

                        check(ACTION_NORTH);
                        height -= range.y;
                        top += range.y;
                        width = height * aspectRatio;
                    } else {
                        check(ACTION_NORTH);
                        check(ACTION_EAST);

                        if (range.x >= 0) {
                            if (right < maxWidth) {
                                width += range.x;
                            } else if (range.y <= 0 && top <= minTop) {
                                renderable = false;
                            }
                        } else {
                            width += range.x;
                        }

                        if (range.y <= 0) {
                            if (top > minTop) {
                                height -= range.y;
                                top += range.y;
                            }
                        } else {
                            height -= range.y;
                            top += range.y;
                        }
                    }

                    if (width < 0 && height < 0) {
                        action = ACTION_SOUTH_WEST;
                        height = -height;
                        width = -width;
                        top -= height;
                        left -= width;
                    } else if (width < 0) {
                        action = ACTION_NORTH_WEST;
                        width = -width;
                        left -= width;
                    } else if (height < 0) {
                        action = ACTION_SOUTH_EAST;
                        height = -height;
                        top -= height;
                    }

                    break;

                case ACTION_NORTH_WEST:
                    if (aspectRatio) {
                        if (range.y <= 0 && (top <= minTop || left <= minLeft)) {
                            renderable = false;
                            break;
                        }

                        check(ACTION_NORTH);
                        height -= range.y;
                        top += range.y;
                        width = height * aspectRatio;
                        left += cropBoxData.width - width;
                    } else {
                        check(ACTION_NORTH);
                        check(ACTION_WEST);

                        if (range.x <= 0) {
                            if (left > minLeft) {
                                width -= range.x;
                                left += range.x;
                            } else if (range.y <= 0 && top <= minTop) {
                                renderable = false;
                            }
                        } else {
                            width -= range.x;
                            left += range.x;
                        }

                        if (range.y <= 0) {
                            if (top > minTop) {
                                height -= range.y;
                                top += range.y;
                            }
                        } else {
                            height -= range.y;
                            top += range.y;
                        }
                    }

                    if (width < 0 && height < 0) {
                        action = ACTION_SOUTH_EAST;
                        height = -height;
                        width = -width;
                        top -= height;
                        left -= width;
                    } else if (width < 0) {
                        action = ACTION_NORTH_EAST;
                        width = -width;
                        left -= width;
                    } else if (height < 0) {
                        action = ACTION_SOUTH_WEST;
                        height = -height;
                        top -= height;
                    }

                    break;

                case ACTION_SOUTH_WEST:
                    if (aspectRatio) {
                        if (range.x <= 0 && (left <= minLeft || bottom >= maxHeight)) {
                            renderable = false;
                            break;
                        }

                        check(ACTION_WEST);
                        width -= range.x;
                        left += range.x;
                        height = width / aspectRatio;
                    } else {
                        check(ACTION_SOUTH);
                        check(ACTION_WEST);

                        if (range.x <= 0) {
                            if (left > minLeft) {
                                width -= range.x;
                                left += range.x;
                            } else if (range.y >= 0 && bottom >= maxHeight) {
                                renderable = false;
                            }
                        } else {
                            width -= range.x;
                            left += range.x;
                        }

                        if (range.y >= 0) {
                            if (bottom < maxHeight) {
                                height += range.y;
                            }
                        } else {
                            height += range.y;
                        }
                    }

                    if (width < 0 && height < 0) {
                        action = ACTION_NORTH_EAST;
                        height = -height;
                        width = -width;
                        top -= height;
                        left -= width;
                    } else if (width < 0) {
                        action = ACTION_SOUTH_EAST;
                        width = -width;
                        left -= width;
                    } else if (height < 0) {
                        action = ACTION_NORTH_WEST;
                        height = -height;
                        top -= height;
                    }

                    break;

                case ACTION_SOUTH_EAST:
                    if (aspectRatio) {
                        if (range.x >= 0 && (right >= maxWidth || bottom >= maxHeight)) {
                            renderable = false;
                            break;
                        }

                        check(ACTION_EAST);
                        width += range.x;
                        height = width / aspectRatio;
                    } else {
                        check(ACTION_SOUTH);
                        check(ACTION_EAST);

                        if (range.x >= 0) {
                            if (right < maxWidth) {
                                width += range.x;
                            } else if (range.y >= 0 && bottom >= maxHeight) {
                                renderable = false;
                            }
                        } else {
                            width += range.x;
                        }

                        if (range.y >= 0) {
                            if (bottom < maxHeight) {
                                height += range.y;
                            }
                        } else {
                            height += range.y;
                        }
                    }

                    if (width < 0 && height < 0) {
                        action = ACTION_NORTH_WEST;
                        height = -height;
                        width = -width;
                        top -= height;
                        left -= width;
                    } else if (width < 0) {
                        action = ACTION_SOUTH_WEST;
                        width = -width;
                        left -= width;
                    } else if (height < 0) {
                        action = ACTION_NORTH_EAST;
                        height = -height;
                        top -= height;
                    }

                    break;
                // Move canvas

                case ACTION_MOVE:
                    this.move(range.x, range.y);
                    renderable = false;
                    break;
                // Zoom canvas

                case ACTION_ZOOM:
                    this.zoom(getMaxZoomRatio(pointers), e);
                    renderable = false;
                    break;
                // Create crop box

                case ACTION_CROP:
                    if (!range.x || !range.y) {
                        renderable = false;
                        break;
                    }

                    offset = getOffset(this.cropper);
                    left = pointer.startX - offset.left;
                    top = pointer.startY - offset.top;
                    width = cropBoxData.minWidth;
                    height = cropBoxData.minHeight;

                    if (range.x > 0) {
                        action = range.y > 0 ? ACTION_SOUTH_EAST : ACTION_NORTH_EAST;
                    } else if (range.x < 0) {
                        left -= width;
                        action = range.y > 0 ? ACTION_SOUTH_WEST : ACTION_NORTH_WEST;
                    }

                    if (range.y < 0) {
                        top -= height;
                    } // Show the crop box if is hidden


                    if (!this.cropped) {
                        removeClass(this.cropBox, CLASS_HIDDEN);
                        this.cropped = true;

                        if (this.limited) {
                            this.limitCropBox(true, true);
                        }
                    }

                    break;

                default:
            }

            if (renderable) {
                cropBoxData.width = width;
                cropBoxData.height = height;
                cropBoxData.left = left;
                cropBoxData.top = top;
                this.action = action;
                this.renderCropBox();
            } // Override


            forEach(pointers, function (p) {
                p.startX = p.endX;
                p.startY = p.endY;
            });
        }
    };

    var methods = {
        // Show the crop box manually
        crop: function crop() {
            if (this.ready && !this.cropped && !this.disabled) {
                this.cropped = true;
                this.limitCropBox(true, true);

                if (this.options.modal) {
                    addClass(this.dragBox, CLASS_MODAL);
                }

                removeClass(this.cropBox, CLASS_HIDDEN);
                this.setCropBoxData(this.initialCropBoxData);
            }

            return this;
        },
        // Reset the image and crop box to their initial states
        reset: function reset() {
            if (this.ready && !this.disabled) {
                this.imageData = assign({}, this.initialImageData);
                this.canvasData = assign({}, this.initialCanvasData);
                this.cropBoxData = assign({}, this.initialCropBoxData);
                this.renderCanvas();

                if (this.cropped) {
                    this.renderCropBox();
                }
            }

            return this;
        },
        // Clear the crop box
        clear: function clear() {
            if (this.cropped && !this.disabled) {
                assign(this.cropBoxData, {
                    left: 0,
                    top: 0,
                    width: 0,
                    height: 0
                });
                this.cropped = false;
                this.renderCropBox();
                this.limitCanvas(true, true); // Render canvas after crop box rendered

                this.renderCanvas();
                removeClass(this.dragBox, CLASS_MODAL);
                addClass(this.cropBox, CLASS_HIDDEN);
            }

            return this;
        },

        /**
         * Replace the image's src and rebuild the cropper
         * @param {string} url - The new URL.
         * @param {boolean} [hasSameSize] - Indicate if the new image has the same size as the old one.
         * @returns {Cropper} this
         */
        replace: function replace(url) {
            var hasSameSize = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

            if (!this.disabled && url) {
                if (this.isImg) {
                    this.element.src = url;
                }

                if (hasSameSize) {
                    this.url = url;
                    this.image.src = url;

                    if (this.ready) {
                        this.viewBoxImage.src = url;
                        forEach(this.previews, function (element) {
                            element.getElementsByTagName('img')[0].src = url;
                        });
                    }
                } else {
                    if (this.isImg) {
                        this.replaced = true;
                    }

                    this.options.data = null;
                    this.uncreate();
                    this.load(url);
                }
            }

            return this;
        },
        // Enable (unfreeze) the cropper
        enable: function enable() {
            if (this.ready && this.disabled) {
                this.disabled = false;
                removeClass(this.cropper, CLASS_DISABLED);
            }

            return this;
        },
        // Disable (freeze) the cropper
        disable: function disable() {
            if (this.ready && !this.disabled) {
                this.disabled = true;
                addClass(this.cropper, CLASS_DISABLED);
            }

            return this;
        },

        /**
         * Destroy the cropper and remove the instance from the image
         * @returns {Cropper} this
         */
        destroy: function destroy() {
            var element = this.element;

            if (!element[NAMESPACE]) {
                return this;
            }

            element[NAMESPACE] = undefined;

            if (this.isImg && this.replaced) {
                element.src = this.originalUrl;
            }

            this.uncreate();
            return this;
        },

        /**
         * Move the canvas with relative offsets
         * @param {number} offsetX - The relative offset distance on the x-axis.
         * @param {number} [offsetY=offsetX] - The relative offset distance on the y-axis.
         * @returns {Cropper} this
         */
        move: function move(offsetX) {
            var offsetY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : offsetX;
            var _this$canvasData = this.canvasData,
                left = _this$canvasData.left,
                top = _this$canvasData.top;
            return this.moveTo(isUndefined(offsetX) ? offsetX : left + Number(offsetX), isUndefined(offsetY) ? offsetY : top + Number(offsetY));
        },

        /**
         * Move the canvas to an absolute point
         * @param {number} x - The x-axis coordinate.
         * @param {number} [y=x] - The y-axis coordinate.
         * @returns {Cropper} this
         */
        moveTo: function moveTo(x) {
            var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
            var canvasData = this.canvasData;
            var changed = false;
            x = Number(x);
            y = Number(y);

            if (this.ready && !this.disabled && this.options.movable) {
                if (isNumber(x)) {
                    canvasData.left = x;
                    changed = true;
                }

                if (isNumber(y)) {
                    canvasData.top = y;
                    changed = true;
                }

                if (changed) {
                    this.renderCanvas(true);
                }
            }

            return this;
        },

        /**
         * Zoom the canvas with a relative ratio
         * @param {number} ratio - The target ratio.
         * @param {Event} _originalEvent - The original event if any.
         * @returns {Cropper} this
         */
        zoom: function zoom(ratio, _originalEvent) {
            var canvasData = this.canvasData;
            ratio = Number(ratio);

            if (ratio < 0) {
                ratio = 1 / (1 - ratio);
            } else {
                ratio = 1 + ratio;
            }

            return this.zoomTo(canvasData.width * ratio / canvasData.naturalWidth, null, _originalEvent);
        },

        /**
         * Zoom the canvas to an absolute ratio
         * @param {number} ratio - The target ratio.
         * @param {Object} pivot - The zoom pivot point coordinate.
         * @param {Event} _originalEvent - The original event if any.
         * @returns {Cropper} this
         */
        zoomTo: function zoomTo(ratio, pivot, _originalEvent) {
            var options = this.options,
                canvasData = this.canvasData;
            var width = canvasData.width,
                height = canvasData.height,
                naturalWidth = canvasData.naturalWidth,
                naturalHeight = canvasData.naturalHeight;
            ratio = Number(ratio);

            if (ratio >= 0 && this.ready && !this.disabled && options.zoomable) {
                var newWidth = naturalWidth * ratio;
                var newHeight = naturalHeight * ratio;

                if (dispatchEvent(this.element, EVENT_ZOOM, {
                        ratio: ratio,
                        oldRatio: width / naturalWidth,
                        originalEvent: _originalEvent
                    }) === false) {
                    return this;
                }

                if (_originalEvent) {
                    var pointers = this.pointers;
                    var offset = getOffset(this.cropper);
                    var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : {
                        pageX: _originalEvent.pageX,
                        pageY: _originalEvent.pageY
                    }; // Zoom from the triggering point of the event

                    canvasData.left -= (newWidth - width) * ((center.pageX - offset.left - canvasData.left) / width);
                    canvasData.top -= (newHeight - height) * ((center.pageY - offset.top - canvasData.top) / height);
                } else if (isPlainObject(pivot) && isNumber(pivot.x) && isNumber(pivot.y)) {
                    canvasData.left -= (newWidth - width) * ((pivot.x - canvasData.left) / width);
                    canvasData.top -= (newHeight - height) * ((pivot.y - canvasData.top) / height);
                } else {
                    // Zoom from the center of the canvas
                    canvasData.left -= (newWidth - width) / 2;
                    canvasData.top -= (newHeight - height) / 2;
                }

                canvasData.width = newWidth;
                canvasData.height = newHeight;
                this.renderCanvas(true);
            }

            return this;
        },

        /**
         * Rotate the canvas with a relative degree
         * @param {number} degree - The rotate degree.
         * @returns {Cropper} this
         */
        rotate: function rotate(degree) {
            return this.rotateTo((this.imageData.rotate || 0) + Number(degree));
        },

        /**
         * Rotate the canvas to an absolute degree
         * @param {number} degree - The rotate degree.
         * @returns {Cropper} this
         */
        rotateTo: function rotateTo(degree) {
            degree = Number(degree);

            if (isNumber(degree) && this.ready && !this.disabled && this.options.rotatable) {
                this.imageData.rotate = degree % 360;
                this.renderCanvas(true, true);
            }

            return this;
        },

        /**
         * Scale the image on the x-axis.
         * @param {number} scaleX - The scale ratio on the x-axis.
         * @returns {Cropper} this
         */
        scaleX: function scaleX(_scaleX) {
            var scaleY = this.imageData.scaleY;
            return this.scale(_scaleX, isNumber(scaleY) ? scaleY : 1);
        },

        /**
         * Scale the image on the y-axis.
         * @param {number} scaleY - The scale ratio on the y-axis.
         * @returns {Cropper} this
         */
        scaleY: function scaleY(_scaleY) {
            var scaleX = this.imageData.scaleX;
            return this.scale(isNumber(scaleX) ? scaleX : 1, _scaleY);
        },

        /**
         * Scale the image
         * @param {number} scaleX - The scale ratio on the x-axis.
         * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
         * @returns {Cropper} this
         */
        scale: function scale(scaleX) {
            var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
            var imageData = this.imageData;
            var transformed = false;
            scaleX = Number(scaleX);
            scaleY = Number(scaleY);

            if (this.ready && !this.disabled && this.options.scalable) {
                if (isNumber(scaleX)) {
                    imageData.scaleX = scaleX;
                    transformed = true;
                }

                if (isNumber(scaleY)) {
                    imageData.scaleY = scaleY;
                    transformed = true;
                }

                if (transformed) {
                    this.renderCanvas(true, true);
                }
            }

            return this;
        },

        /**
         * Get the cropped area position and size data (base on the original image)
         * @param {boolean} [rounded=false] - Indicate if round the data values or not.
         * @returns {Object} The result cropped data.
         */
        getData: function getData$$1() {
            var rounded = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
            var options = this.options,
                imageData = this.imageData,
                canvasData = this.canvasData,
                cropBoxData = this.cropBoxData;
            var data;

            if (this.ready && this.cropped) {
                data = {
                    x: cropBoxData.left - canvasData.left,
                    y: cropBoxData.top - canvasData.top,
                    width: cropBoxData.width,
                    height: cropBoxData.height
                };
                var ratio = imageData.width / imageData.naturalWidth;
                forEach(data, function (n, i) {
                    data[i] = n / ratio;
                });

                if (rounded) {
                    // In case rounding off leads to extra 1px in right or bottom border
                    // we should round the top-left corner and the dimension (#343).
                    var bottom = Math.round(data.y + data.height);
                    var right = Math.round(data.x + data.width);
                    data.x = Math.round(data.x);
                    data.y = Math.round(data.y);
                    data.width = right - data.x;
                    data.height = bottom - data.y;
                }
            } else {
                data = {
                    x: 0,
                    y: 0,
                    width: 0,
                    height: 0
                };
            }

            if (options.rotatable) {
                data.rotate = imageData.rotate || 0;
            }

            if (options.scalable) {
                data.scaleX = imageData.scaleX || 1;
                data.scaleY = imageData.scaleY || 1;
            }

            return data;
        },

        /**
         * Set the cropped area position and size with new data
         * @param {Object} data - The new data.
         * @returns {Cropper} this
         */
        setData: function setData$$1(data) {
            var options = this.options,
                imageData = this.imageData,
                canvasData = this.canvasData;
            var cropBoxData = {};

            if (this.ready && !this.disabled && isPlainObject(data)) {
                var transformed = false;

                if (options.rotatable) {
                    if (isNumber(data.rotate) && data.rotate !== imageData.rotate) {
                        imageData.rotate = data.rotate;
                        transformed = true;
                    }
                }

                if (options.scalable) {
                    if (isNumber(data.scaleX) && data.scaleX !== imageData.scaleX) {
                        imageData.scaleX = data.scaleX;
                        transformed = true;
                    }

                    if (isNumber(data.scaleY) && data.scaleY !== imageData.scaleY) {
                        imageData.scaleY = data.scaleY;
                        transformed = true;
                    }
                }

                if (transformed) {
                    this.renderCanvas(true, true);
                }

                var ratio = imageData.width / imageData.naturalWidth;

                if (isNumber(data.x)) {
                    cropBoxData.left = data.x * ratio + canvasData.left;
                }

                if (isNumber(data.y)) {
                    cropBoxData.top = data.y * ratio + canvasData.top;
                }

                if (isNumber(data.width)) {
                    cropBoxData.width = data.width * ratio;
                }

                if (isNumber(data.height)) {
                    cropBoxData.height = data.height * ratio;
                }

                this.setCropBoxData(cropBoxData);
            }

            return this;
        },

        /**
         * Get the container size data.
         * @returns {Object} The result container data.
         */
        getContainerData: function getContainerData() {
            return this.ready ? assign({}, this.containerData) : {};
        },

        /**
         * Get the image position and size data.
         * @returns {Object} The result image data.
         */
        getImageData: function getImageData() {
            return this.sized ? assign({}, this.imageData) : {};
        },

        /**
         * Get the canvas position and size data.
         * @returns {Object} The result canvas data.
         */
        getCanvasData: function getCanvasData() {
            var canvasData = this.canvasData;
            var data = {};

            if (this.ready) {
                forEach(['left', 'top', 'width', 'height', 'naturalWidth', 'naturalHeight'], function (n) {
                    data[n] = canvasData[n];
                });
            }

            return data;
        },

        /**
         * Set the canvas position and size with new data.
         * @param {Object} data - The new canvas data.
         * @returns {Cropper} this
         */
        setCanvasData: function setCanvasData(data) {
            var canvasData = this.canvasData;
            var aspectRatio = canvasData.aspectRatio;

            if (this.ready && !this.disabled && isPlainObject(data)) {
                if (isNumber(data.left)) {
                    canvasData.left = data.left;
                }

                if (isNumber(data.top)) {
                    canvasData.top = data.top;
                }

                if (isNumber(data.width)) {
                    canvasData.width = data.width;
                    canvasData.height = data.width / aspectRatio;
                } else if (isNumber(data.height)) {
                    canvasData.height = data.height;
                    canvasData.width = data.height * aspectRatio;
                }

                this.renderCanvas(true);
            }

            return this;
        },

        /**
         * Get the crop box position and size data.
         * @returns {Object} The result crop box data.
         */
        getCropBoxData: function getCropBoxData() {
            var cropBoxData = this.cropBoxData;
            var data;

            if (this.ready && this.cropped) {
                data = {
                    left: cropBoxData.left,
                    top: cropBoxData.top,
                    width: cropBoxData.width,
                    height: cropBoxData.height
                };
            }

            return data || {};
        },

        /**
         * Set the crop box position and size with new data.
         * @param {Object} data - The new crop box data.
         * @returns {Cropper} this
         */
        setCropBoxData: function setCropBoxData(data) {
            var cropBoxData = this.cropBoxData;
            var aspectRatio = this.options.aspectRatio;
            var widthChanged;
            var heightChanged;

            if (this.ready && this.cropped && !this.disabled && isPlainObject(data)) {
                if (isNumber(data.left)) {
                    cropBoxData.left = data.left;
                }

                if (isNumber(data.top)) {
                    cropBoxData.top = data.top;
                }

                if (isNumber(data.width) && data.width !== cropBoxData.width) {
                    widthChanged = true;
                    cropBoxData.width = data.width;
                }

                if (isNumber(data.height) && data.height !== cropBoxData.height) {
                    heightChanged = true;
                    cropBoxData.height = data.height;
                }

                if (aspectRatio) {
                    if (widthChanged) {
                        cropBoxData.height = cropBoxData.width / aspectRatio;
                    } else if (heightChanged) {
                        cropBoxData.width = cropBoxData.height * aspectRatio;
                    }
                }

                this.renderCropBox();
            }

            return this;
        },

        /**
         * Get a canvas drawn the cropped image.
         * @param {Object} [options={}] - The config options.
         * @returns {HTMLCanvasElement} - The result canvas.
         */
        getCroppedCanvas: function getCroppedCanvas() {
            var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

            if (!this.ready || !window.HTMLCanvasElement) {
                return null;
            }

            var canvasData = this.canvasData;
            var source = getSourceCanvas(this.image, this.imageData, canvasData, options); // Returns the source canvas if it is not cropped.

            if (!this.cropped) {
                return source;
            }

            var _this$getData = this.getData(),
                initialX = _this$getData.x,
                initialY = _this$getData.y,
                initialWidth = _this$getData.width,
                initialHeight = _this$getData.height;

            var ratio = source.width / Math.floor(canvasData.naturalWidth);

            if (ratio !== 1) {
                initialX *= ratio;
                initialY *= ratio;
                initialWidth *= ratio;
                initialHeight *= ratio;
            }

            var aspectRatio = initialWidth / initialHeight;
            var maxSizes = getAdjustedSizes({
                aspectRatio: aspectRatio,
                width: options.maxWidth || Infinity,
                height: options.maxHeight || Infinity
            });
            var minSizes = getAdjustedSizes({
                aspectRatio: aspectRatio,
                width: options.minWidth || 0,
                height: options.minHeight || 0
            }, 'cover');

            var _getAdjustedSizes = getAdjustedSizes({
                    aspectRatio: aspectRatio,
                    width: options.width || (ratio !== 1 ? source.width : initialWidth),
                    height: options.height || (ratio !== 1 ? source.height : initialHeight)
                }),
                width = _getAdjustedSizes.width,
                height = _getAdjustedSizes.height;

            width = Math.min(maxSizes.width, Math.max(minSizes.width, width));
            height = Math.min(maxSizes.height, Math.max(minSizes.height, height));
            var canvas = document.createElement('canvas');
            var context = canvas.getContext('2d');
            canvas.width = normalizeDecimalNumber(width);
            canvas.height = normalizeDecimalNumber(height);
            context.fillStyle = options.fillColor || 'transparent';
            context.fillRect(0, 0, width, height);
            var _options$imageSmoothi = options.imageSmoothingEnabled,
                imageSmoothingEnabled = _options$imageSmoothi === void 0 ? true : _options$imageSmoothi,
                imageSmoothingQuality = options.imageSmoothingQuality;
            context.imageSmoothingEnabled = imageSmoothingEnabled;

            if (imageSmoothingQuality) {
                context.imageSmoothingQuality = imageSmoothingQuality;
            } // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D.drawImage


            var sourceWidth = source.width;
            var sourceHeight = source.height; // Source canvas parameters

            var srcX = initialX;
            var srcY = initialY;
            var srcWidth;
            var srcHeight; // Destination canvas parameters

            var dstX;
            var dstY;
            var dstWidth;
            var dstHeight;

            if (srcX <= -initialWidth || srcX > sourceWidth) {
                srcX = 0;
                srcWidth = 0;
                dstX = 0;
                dstWidth = 0;
            } else if (srcX <= 0) {
                dstX = -srcX;
                srcX = 0;
                srcWidth = Math.min(sourceWidth, initialWidth + srcX);
                dstWidth = srcWidth;
            } else if (srcX <= sourceWidth) {
                dstX = 0;
                srcWidth = Math.min(initialWidth, sourceWidth - srcX);
                dstWidth = srcWidth;
            }

            if (srcWidth <= 0 || srcY <= -initialHeight || srcY > sourceHeight) {
                srcY = 0;
                srcHeight = 0;
                dstY = 0;
                dstHeight = 0;
            } else if (srcY <= 0) {
                dstY = -srcY;
                srcY = 0;
                srcHeight = Math.min(sourceHeight, initialHeight + srcY);
                dstHeight = srcHeight;
            } else if (srcY <= sourceHeight) {
                dstY = 0;
                srcHeight = Math.min(initialHeight, sourceHeight - srcY);
                dstHeight = srcHeight;
            }

            var params = [srcX, srcY, srcWidth, srcHeight]; // Avoid "IndexSizeError"

            if (dstWidth > 0 && dstHeight > 0) {
                var scale = width / initialWidth;
                params.push(dstX * scale, dstY * scale, dstWidth * scale, dstHeight * scale);
            } // All the numerical parameters should be integer for `drawImage`
            // https://github.com/fengyuanchen/cropper/issues/476


            context.drawImage.apply(context, [source].concat(_toConsumableArray(params.map(function (param) {
                return Math.floor(normalizeDecimalNumber(param));
            }))));
            return canvas;
        },

        /**
         * Change the aspect ratio of the crop box.
         * @param {number} aspectRatio - The new aspect ratio.
         * @returns {Cropper} this
         */
        setAspectRatio: function setAspectRatio(aspectRatio) {
            var options = this.options;

            if (!this.disabled && !isUndefined(aspectRatio)) {
                // 0 -> NaN
                options.aspectRatio = Math.max(0, aspectRatio) || NaN;

                if (this.ready) {
                    this.initCropBox();

                    if (this.cropped) {
                        this.renderCropBox();
                    }
                }
            }

            return this;
        },

        /**
         * Change the drag mode.
         * @param {string} mode - The new drag mode.
         * @returns {Cropper} this
         */
        setDragMode: function setDragMode(mode) {
            var options = this.options,
                dragBox = this.dragBox,
                face = this.face;

            if (this.ready && !this.disabled) {
                var croppable = mode === DRAG_MODE_CROP;
                var movable = options.movable && mode === DRAG_MODE_MOVE;
                mode = croppable || movable ? mode : DRAG_MODE_NONE;
                options.dragMode = mode;
                setData(dragBox, DATA_ACTION, mode);
                toggleClass(dragBox, CLASS_CROP, croppable);
                toggleClass(dragBox, CLASS_MOVE, movable);

                if (!options.cropBoxMovable) {
                    // Sync drag mode to crop box when it is not movable
                    setData(face, DATA_ACTION, mode);
                    toggleClass(face, CLASS_CROP, croppable);
                    toggleClass(face, CLASS_MOVE, movable);
                }
            }

            return this;
        }
    };

    var AnotherCropper = WINDOW.Cropper;

    var Cropper =
        /*#__PURE__*/
        function () {
            /**
             * Create a new Cropper.
             * @param {Element} element - The target element for cropping.
             * @param {Object} [options={}] - The configuration options.
             */
            function Cropper(element) {
                var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

                _classCallCheck(this, Cropper);

                if (!element || !REGEXP_TAG_NAME.test(element.tagName)) {
                    throw new Error('The first argument is required and must be an <img> or <canvas> element.');
                }

                this.element = element;
                this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
                this.cropped = false;
                this.disabled = false;
                this.pointers = {};
                this.ready = false;
                this.reloading = false;
                this.replaced = false;
                this.sized = false;
                this.sizing = false;
                this.init();
            }

            _createClass(Cropper, [{
                key: "init",
                value: function init() {
                    var element = this.element;
                    var tagName = element.tagName.toLowerCase();
                    var url;

                    if (element[NAMESPACE]) {
                        return;
                    }

                    element[NAMESPACE] = this;

                    if (tagName === 'img') {
                        this.isImg = true; // e.g.: "img/picture.jpg"

                        url = element.getAttribute('src') || '';
                        this.originalUrl = url; // Stop when it's a blank image

                        if (!url) {
                            return;
                        } // e.g.: "http://example.com/img/picture.jpg"


                        url = element.src;
                    } else if (tagName === 'canvas' && window.HTMLCanvasElement) {
                        url = element.toDataURL();
                    }

                    this.load(url);
                }
            }, {
                key: "load",
                value: function load(url) {
                    var _this = this;

                    if (!url) {
                        return;
                    }

                    this.url = url;
                    this.imageData = {};
                    var element = this.element,
                        options = this.options;

                    if (!options.rotatable && !options.scalable) {
                        options.checkOrientation = false;
                    } // Only IE10+ supports Typed Arrays


                    if (!options.checkOrientation || !window.ArrayBuffer) {
                        this.clone();
                        return;
                    } // XMLHttpRequest disallows to open a Data URL in some browsers like IE11 and Safari


                    if (REGEXP_DATA_URL.test(url)) {
                        if (REGEXP_DATA_URL_JPEG.test(url)) {
                            this.read(dataURLToArrayBuffer(url));
                        } else {
                            this.clone();
                        }

                        return;
                    }

                    var xhr = new XMLHttpRequest();
                    var clone = this.clone.bind(this);
                    this.reloading = true;
                    this.xhr = xhr;
                    xhr.ontimeout = clone;
                    xhr.onabort = clone;
                    xhr.onerror = clone;

                    xhr.onprogress = function () {
                        if (xhr.getResponseHeader('content-type') !== MIME_TYPE_JPEG) {
                            xhr.abort();
                        }
                    };

                    xhr.onload = function () {
                        _this.read(xhr.response);
                    };

                    xhr.onloadend = function () {
                        _this.reloading = false;
                        _this.xhr = null;
                    }; // Bust cache when there is a "crossOrigin" property to avoid browser cache error


                    if (options.checkCrossOrigin && isCrossOriginURL(url) && element.crossOrigin) {
                        url = addTimestamp(url);
                    }

                    xhr.open('GET', url);
                    xhr.responseType = 'arraybuffer';
                    xhr.withCredentials = element.crossOrigin === 'use-credentials';
                    xhr.send();
                }
            }, {
                key: "read",
                value: function read(arrayBuffer) {
                    var options = this.options,
                        imageData = this.imageData;
                    var orientation = resetAndGetOrientation(arrayBuffer);
                    var rotate = 0;
                    var scaleX = 1;
                    var scaleY = 1;

                    if (orientation > 1) {
                        // Generate a new Data URL with the orientation value set to 1
                        // as some iOS browsers will render image with its orientation
                        this.url = arrayBufferToDataURL(arrayBuffer, MIME_TYPE_JPEG);

                        var _parseOrientation = parseOrientation(orientation);

                        rotate = _parseOrientation.rotate;
                        scaleX = _parseOrientation.scaleX;
                        scaleY = _parseOrientation.scaleY;
                    }

                    if (options.rotatable) {
                        imageData.rotate = rotate;
                    }

                    if (options.scalable) {
                        imageData.scaleX = scaleX;
                        imageData.scaleY = scaleY;
                    }

                    this.clone();
                }
            }, {
                key: "clone",
                value: function clone() {
                    var element = this.element,
                        url = this.url;
                    var crossOrigin;
                    var crossOriginUrl;

                    if (this.options.checkCrossOrigin && isCrossOriginURL(url)) {
                        crossOrigin = element.crossOrigin;

                        if (crossOrigin) {
                            crossOriginUrl = url;
                        } else {
                            crossOrigin = 'anonymous'; // Bust cache when there is not a "crossOrigin" property

                            crossOriginUrl = addTimestamp(url);
                        }
                    }

                    this.crossOrigin = crossOrigin;
                    this.crossOriginUrl = crossOriginUrl;
                    var image = document.createElement('img');

                    if (crossOrigin) {
                        image.crossOrigin = crossOrigin;
                    }

                    image.src = crossOriginUrl || url;
                    this.image = image;
                    image.onload = this.start.bind(this);
                    image.onerror = this.stop.bind(this);
                    addClass(image, CLASS_HIDE);
                    element.parentNode.insertBefore(image, element.nextSibling);
                }
            }, {
                key: "start",
                value: function start() {
                    var _this2 = this;

                    var image = this.isImg ? this.element : this.image;
                    image.onload = null;
                    image.onerror = null;
                    this.sizing = true;
                    var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);

                    var done = function done(naturalWidth, naturalHeight) {
                        assign(_this2.imageData, {
                            naturalWidth: naturalWidth,
                            naturalHeight: naturalHeight,
                            aspectRatio: naturalWidth / naturalHeight
                        });
                        _this2.sizing = false;
                        _this2.sized = true;

                        _this2.build();
                    }; // Modern browsers (except Safari)


                    if (image.naturalWidth && !IS_SAFARI) {
                        done(image.naturalWidth, image.naturalHeight);
                        return;
                    }

                    var sizingImage = document.createElement('img');
                    var body = document.body || document.documentElement;
                    this.sizingImage = sizingImage;

                    sizingImage.onload = function () {
                        done(sizingImage.width, sizingImage.height);

                        if (!IS_SAFARI) {
                            body.removeChild(sizingImage);
                        }
                    };

                    sizingImage.src = image.src; // iOS Safari will convert the image automatically
                    // with its orientation once append it into DOM (#279)

                    if (!IS_SAFARI) {
                        sizingImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
                        body.appendChild(sizingImage);
                    }
                }
            }, {
                key: "stop",
                value: function stop() {
                    var image = this.image;
                    image.onload = null;
                    image.onerror = null;
                    image.parentNode.removeChild(image);
                    this.image = null;
                }
            }, {
                key: "build",
                value: function build() {
                    if (!this.sized || this.ready) {
                        return;
                    }

                    var element = this.element,
                        options = this.options,
                        image = this.image; // Create cropper elements

                    var container = element.parentNode;
                    var template = document.createElement('div');
                    template.innerHTML = TEMPLATE;
                    var cropper = template.querySelector(".".concat(NAMESPACE, "-container"));
                    var canvas = cropper.querySelector(".".concat(NAMESPACE, "-canvas"));
                    var dragBox = cropper.querySelector(".".concat(NAMESPACE, "-drag-box"));
                    var cropBox = cropper.querySelector(".".concat(NAMESPACE, "-crop-box"));
                    var face = cropBox.querySelector(".".concat(NAMESPACE, "-face"));
                    this.container = container;
                    this.cropper = cropper;
                    this.canvas = canvas;
                    this.dragBox = dragBox;
                    this.cropBox = cropBox;
                    this.viewBox = cropper.querySelector(".".concat(NAMESPACE, "-view-box"));
                    this.face = face;
                    canvas.appendChild(image); // Hide the original image

                    addClass(element, CLASS_HIDDEN); // Inserts the cropper after to the current image

                    container.insertBefore(cropper, element.nextSibling); // Show the image if is hidden

                    if (!this.isImg) {
                        removeClass(image, CLASS_HIDE);
                    }

                    this.initPreview();
                    this.bind();
                    options.initialAspectRatio = Math.max(0, options.initialAspectRatio) || NaN;
                    options.aspectRatio = Math.max(0, options.aspectRatio) || NaN;
                    options.viewMode = Math.max(0, Math.min(3, Math.round(options.viewMode))) || 0;
                    addClass(cropBox, CLASS_HIDDEN);

                    if (!options.guides) {
                        addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-dashed")), CLASS_HIDDEN);
                    }

                    if (!options.center) {
                        addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-center")), CLASS_HIDDEN);
                    }

                    if (options.background) {
                        addClass(cropper, "".concat(NAMESPACE, "-bg"));
                    }

                    if (!options.highlight) {
                        addClass(face, CLASS_INVISIBLE);
                    }

                    if (options.cropBoxMovable) {
                        addClass(face, CLASS_MOVE);
                        setData(face, DATA_ACTION, ACTION_ALL);
                    }

                    if (!options.cropBoxResizable) {
                        addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-line")), CLASS_HIDDEN);
                        addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-point")), CLASS_HIDDEN);
                    }

                    this.render();
                    this.ready = true;
                    this.setDragMode(options.dragMode);

                    if (options.autoCrop) {
                        this.crop();
                    }

                    this.setData(options.data);

                    if (isFunction(options.ready)) {
                        addListener(element, EVENT_READY, options.ready, {
                            once: true
                        });
                    }

                    dispatchEvent(element, EVENT_READY);
                }
            }, {
                key: "unbuild",
                value: function unbuild() {
                    if (!this.ready) {
                        return;
                    }

                    this.ready = false;
                    this.unbind();
                    this.resetPreview();
                    this.cropper.parentNode.removeChild(this.cropper);
                    removeClass(this.element, CLASS_HIDDEN);
                }
            }, {
                key: "uncreate",
                value: function uncreate() {
                    if (this.ready) {
                        this.unbuild();
                        this.ready = false;
                        this.cropped = false;
                    } else if (this.sizing) {
                        this.sizingImage.onload = null;
                        this.sizing = false;
                        this.sized = false;
                    } else if (this.reloading) {
                        this.xhr.onabort = null;
                        this.xhr.abort();
                    } else if (this.image) {
                        this.stop();
                    }
                }
                /**
                 * Get the no conflict cropper class.
                 * @returns {Cropper} The cropper class.
                 */

            }], [{
                key: "noConflict",
                value: function noConflict() {
                    window.Cropper = AnotherCropper;
                    return Cropper;
                }
                /**
                 * Change the default options.
                 * @param {Object} options - The new default options.
                 */

            }, {
                key: "setDefaults",
                value: function setDefaults(options) {
                    assign(DEFAULTS, isPlainObject(options) && options);
                }
            }]);

            return Cropper;
        }();

    assign(Cropper.prototype, render, preview, events, handlers, change, methods);

    return Cropper;

})));

cropper-jquery-js

/*!
 * jQuery Cropper v1.0.0
 * https://github.com/fengyuanchen/jquery-cropper
 *
 * Copyright (c) 2018 Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2018-04-01T06:20:13.168Z
 */

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('jquery'), require('cropperjs')) :
        typeof define === 'function' && define.amd ? define(['jquery', 'cropperjs'], factory) :
            global.layui && layui.define ? layui.define(['jquery', 'cropper'], function (exports) {
                    exports('jqcropper', factory(layui.jquery, layui.cropper))
                }) :
                (factory(global.jQuery, global.Cropper));
}(this, (function ($, Cropper) {
    'use strict';

    $ = $ && $.hasOwnProperty('default') ? $['default'] : $;
    Cropper = Cropper && Cropper.hasOwnProperty('default') ? Cropper['default'] : Cropper;

    if ($.fn) {
        var AnotherCropper = $.fn.cropper;
        var NAMESPACE = 'cropper';

        $.fn.cropper = function jQueryCropper(option) {
            for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
                args[_key - 1] = arguments[_key];
            }

            var result = void 0;

            this.each(function (i, element) {
                var $element = $(element);
                var isDestroy = option === 'destroy';
                var cropper = $element.data(NAMESPACE);

                if (!cropper) {
                    if (isDestroy) {
                        return;
                    }

                    var options = $.extend({}, $element.data(), $.isPlainObject(option) && option);

                    cropper = new Cropper(element, options);
                    $element.data(NAMESPACE, cropper);
                }

                if (typeof option === 'string') {
                    var fn = cropper[option];

                    if ($.isFunction(fn)) {
                        result = fn.apply(cropper, args);

                        if (result === cropper) {
                            result = undefined;
                        }

                        if (isDestroy) {
                            $element.removeData(NAMESPACE);
                        }
                    }
                }
            });

            return result !== undefined ? result : this;
        };

        $.fn.cropper.Constructor = Cropper;
        $.fn.cropper.setDefaults = Cropper.setDefaults;
        $.fn.cropper.noConflict = function noConflict() {
            $.fn.cropper = AnotherCropper;
            return this;
        };
    }

})));

 

本人实现的图片裁剪的代码

裁剪HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <link rel="stylesheet" href="{{static_url('layui/css/layui.css')}}" media="all">
    <link rel="stylesheet" href="{{static_url('cropper/cropper.css')}}">
    <style>
        #choice-btn {
            display: inline-block;
            height: 38px;
            line-height: 38px;
            padding: 0 18px;
            background-color: #009688;
            color: #fff;
            white-space: nowrap;
            text-align: center;
            font-size: 14px;
            border: none;
            border-radius: 2px;
            cursor: pointer;
        }
    </style>
</head>
<body>
<div style="margin: 20px;">
    <div style="margin-bottom:30px;">
        <label for="cropper_imgUpload">
            <span id="choice-btn"><i class="layui-icon">&#xe67c;</i>选择图片</span>
        </label>
        <input type="file" id="cropper_imgUpload" name="file" style="display:none" accept="image/*">
    </div>
    <div class="layui-row layui-col-space15">
        <div class="layui-col-xs9">
            <div id="readyimg"
                 style="height: 360px;width: 100%;border: 1px dashed black;background-color: rgb(247, 247, 247);">
                <img id="img" src="" alt="">
            </div>
        </div>
        <div class="layui-col-xs3">
            <div>预览:</div>
            <div id="img-preview" style="width: 180px;height: 120px;overflow: hidden;border: 1px dashed black;">
            </div>
        </div>
    </div>
    <div class="layui-row layui-hide oper-btn" style="margin-top: 20px;">
        <div class="layui-col-xs9">
            <button type="button" class="layui-btn layui-icon layui-icon-left" cropper-event="rotate" data-option="-15"
                    title="Rotate -90 degrees"> 向左旋转
            </button>
            <button type="button" class="layui-btn layui-icon layui-icon-right" cropper-event="rotate" data-option="15"
                    title="Rotate 90 degrees"> 向右旋转
            </button>
            <button type="button" class="layui-btn layui-icon layui-icon-refresh" cropper-event="reset"
                    title="reset-image">重置图片
            </button>
        </div>
        <div class="layui-col-xs2 layui-col-xs-offset1">
            <button type="button" class="layui-btn layui-btn-fluid" id="keep-save" cropper-event="confirmSave">保存修改
            </button>
        </div>
    </div>
</div>

<script src="{{static_url('layui/layui.js')}}" charset="utf-8"></script>
<script>
    layui.config({
        base: '/static/cropper/'
    }).extend({
        cropper: 'cropper'
    }).use(['element', 'layer', 'cropper', 'jquery', 'jqcropper'], function () {
        var element = layui.element;
        var $ = layui.jquery;
        var layer = layui.layer;
        var cropper = layui.cropper;

        var imageEle = $("#img")
            , preview = '#img-preview'
            , file = $("input[name='file']")
            , uploadImageMaxSize = 2048 //文件上传大小限制
            , options = {
            aspectRatio: 3 / 2,
            viewMode: 1,
            preview: preview,
            dragMode: 'none',
            responsive: false,
            restore: false
            // cropBoxMovable:false,
            // cropBoxResizable:false,
        };
        // 找到上传图片的input标签绑定change事件
        $("#cropper_imgUpload").change(function () {
            $(".oper-btn").removeClass("layui-hide");
            // 1. 创建一个读取文件的对象
            var fileReader = new FileReader();
            fileReader.readAsDataURL(this.files[0]);
            fileReader.onload = function () {
                // 2. 等上一步读完文件之后才 把图片加载到img标签中
                imageEle.attr("src", fileReader.result); //图片链接（base64）
                imageEle.cropper(options);
            };
        });

        $(".layui-btn").on('click', function () {
            var event = $(this).attr("cropper-event");
            //监听确认保存图像
            if (event === 'confirmSave') {
                imageEle.cropper("getCroppedCanvas").toBlob(function (blob) {
                    var filesize = (blob["size"] / 1024).toFixed(2);
                    if (filesize < uploadImageMaxSize) {
                        var formData = new FormData();
                        formData.append('file', blob);

                        $.ajax({
                            method: "post",
                            url: '/web/api/upload/upload?option={{option}}', //用于文件上传的服务器端请求地址
                            data: formData,
                            processData: false,
                            contentType: false,
                            success: function (response) {
                                if (response.code === 0) {
                                    // 代开裁剪页面的回调函数
                                    parent.cropperCallback(response.data, '{{index}}');
                                    layer.msg("上传成功", {
                                        icon: 1,
                                        time: 2500 // 默认三秒
                                    }, function () {
                                        // 回调关闭弹出层
                                        var index = parent.layer.getFrameIndex(window.name);
                                        parent.layer.close(index);
                                    });
                                    $(".canvanslog").attr("src", response.data[0].fp_show);
                                } else {
                                    layer.alert(response.msg, {icon: 2});
                                }
                            },
                            error: function (response) {
                                layer.alert("网络异常", {icon: 2});
                            }
                        });
                    } else {
                        layer.alert("上传图片大小不超过" + uploadImageMaxSize + "KB", {icon: 2})
                    }
                });
            } else if (event === 'rotate') {
                //监听旋转
                var option = $(this).attr('data-option');
                imageEle.cropper('rotate', option);
            } else if (event === 'reset') {
                //重设图片
                imageEle.cropper('reset');
            }
        });
    });
</script>
</body>
</html>

父页面的回调

 // 图片上传成功回调函数
    function cropperCallback(response, index) {
        if (response) {
            var inputEle = document.getElementById("imgInput");
            if (index === "None") {
                // 添加图片的回调
                var trEle = document.createElement("tr");
                var addImageIndex = totalArray.length;
                trEle.innerHTML = '<td><img src="' + response[0].fp_show + '" alt=""></td><td><span style="color: #5FB878;">添加成功</span></td><td>' +
                    '<button type="button" class="layui-btn layui-btn-sm edit-btn" id="edit_' + addImageIndex + '">修改</button>' +
                    '<button type="button" class="layui-btn layui-btn-sm delete-btn" id="delete_' + addImageIndex + '">删除</button></td>';
                document.getElementById("imgList").appendChild(trEle);
                totalArray.push(response[0].fp_relative);
            } else {
                // 修改图片的回调
                var thisTrChild = document.getElementById("edit_" + index).parentElement.parentElement.children;
                thisTrChild[0].innerHTML = '<img src="' + response[0].fp_show + '" alt="">';
                thisTrChild[1].innerHTML = '<span style="color: #5FB878;">修改成功</span>';
                totalArray[parseInt(index)] = response[0].fp_relative;
            }
            inputEle.value = totalArray.join(",");
        }
    }