JQuery.iviewer

from: http://test.dpetroff.ru/jquery.iviewer/test/#

jquery.iviewer.js:

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/*  * iviewer Widget for jQuery UI  * https://github.com/can3p/iviewer  *  * Copyright (c) 2009 - 2012 Dmitry Petrov  * Dual licensed under the MIT and GPL licenses.  *  - http://www.opensource.org/licenses/mit-license.php  *  - http://www.gnu.org/copyleft/gpl.html  *  * Author: Dmitry Petrov  * Version: 0.7.4  */   ( function( $, undefined ) {   //this code was taken from the https://github.com/furf/jquery-ui-touch-punch var mouseEvents = {         touchstart: 'mousedown',         touchmove: 'mousemove',         touchend: 'mouseup'     },     gesturesSupport = 'ongesturestart' in document.createElement('div');     /**  * Convert a touch event to a mouse-like  */ function makeMouseEvent (event) {     var touch = event.originalEvent.changedTouches[0];       return $.extend(event, {         type:    mouseEvents[event.type],         which:   1,         pageX:   touch.pageX,         pageY:   touch.pageY,         screenX: touch.screenX,         screenY: touch.screenY,         clientX: touch.clientX,         clientY: touch.clientY,         isTouchEvent: true     }); }   var mouseProto = $.ui.mouse.prototype,     _mouseInit = $.ui.mouse.prototype._mouseInit;   mouseProto._mouseInit = function() {     var self = this;     self._touchActive = false;       this.element.bind( 'touchstart.' + this.widgetName, function(event) {         if (gesturesSupport && event.originalEvent.touches.length > 1) { return; }         self._touchActive = true;         return self._mouseDown(makeMouseEvent(event));     })       var self = this;     // these delegates are required to keep context     this._mouseMoveDelegate = function(event) {         if (gesturesSupport && event.originalEvent.touches && event.originalEvent.touches.length > 1) { return; }         if (self._touchActive) {             return self._mouseMove(makeMouseEvent(event));         }     };     this._mouseUpDelegate = function(event) {         if (self._touchActive) {             self._touchActive = false;             return self._mouseUp(makeMouseEvent(event));         }     };       $(document)         .bind('touchmove.'+ this.widgetName, this._mouseMoveDelegate)         .bind('touchend.' + this.widgetName, this._mouseUpDelegate);       _mouseInit.apply(this); }   /**  * Simple implementation of jQuery like getters/setters  * var val = something();  * something(val);  */ var setter = function(setter, getter) {     return function(val) {         if (arguments.length === 0) {             return getter.apply(this);         } else {             setter.apply(this, arguments);         }     } };   /**  * Internet explorer rotates image relative left top corner, so we should  * shift image when it's rotated.  */ var ieTransforms = {         '0': {             marginLeft: 0,             marginTop: 0,             filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod="auto expand")'         },           '90': {             marginLeft: -1,             marginTop: 1,             filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=-1, M21=1, M22=0, SizingMethod="auto expand")'         },           '180': {             marginLeft: 0,             marginTop: 0,             filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=-1, M12=0, M21=0, M22=-1, SizingMethod="auto expand")'         },           '270': {             marginLeft: -1,             marginTop: 1,             filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=1, M21=-1, M22=0, SizingMethod="auto expand")'         }     },     useIeTransforms = (jQuery.browser.msie && parseInt(jQuery.browser.version, 10) <= 8);   $.widget( "ui.iviewer", $.ui.mouse, {     widgetEventPrefix: "iviewer",     options : {         /**         * start zoom value for image, not used now         * may be equal to "fit" to fit image into container or scale in %         **/         zoom: "fit",         /**         * base value to scale image         **/         zoom_base: 100,         /**         * maximum zoom         **/         zoom_max: 800,         /**         * minimum zoom         **/         zoom_min: 25,         /**         * base of rate multiplier.         * zoom is calculated by formula: zoom_base * zoom_delta^rate         **/         zoom_delta: 1.4,         /**         * whether the zoom should be animated.         */         zoom_animation: true,         /**         * if true plugin doesn't add its own controls         **/         ui_disabled: false,         /**          * If false mousewheel will be disabled          */         mousewheel: true,         /**         * if false, plugin doesn't bind resize event on window and this must         * be handled manually         **/         update_on_resize: true,         /**         * event is triggered when zoom value is changed         * @param int new zoom value         * @return boolean if false zoom action is aborted         **/         onZoom: jQuery.noop,         /**         * event is triggered when zoom value is changed after image is set to the new dimensions         * @param int new zoom value         * @return boolean if false zoom action is aborted         **/         onAfterZoom: jQuery.noop,         /**         * event is fired on drag begin         * @param object coords mouse coordinates on the image         * @return boolean if false is returned, drag action is aborted         **/         onStartDrag: jQuery.noop,         /**         * event is fired on drag action         * @param object coords mouse coordinates on the image         **/         onDrag: jQuery.noop,         /**         * event is fired on drag stop         * @param object coords mouse coordinates on the image         **/         onStopDrag: jQuery.noop,         /**         * event is fired when mouse moves over image         * @param object coords mouse coordinates on the image         **/         onMouseMove: jQuery.noop,         /**         * mouse click event         * @param object coords mouse coordinates on the image         **/         onClick: jQuery.noop,         /**         * event is fired when image starts to load         */         onStartLoad: null,         /**         * event is fired, when image is loaded and initially positioned         */         onFinishLoad: null     },       _create: function() {         var me = this;           //drag variables         this.dx = 0;         this.dy = 0;           /* object containing actual information about image         *   @img_object.object - jquery img object         *   @img_object.orig_{width|height} - original dimensions         *   @img_object.display_{width|height} - actual dimensions         */         this.img_object = {};           this.zoom_object = {}; //object to show zoom status           this._angle = 0;           this.current_zoom = this.options.zoom;           if(this.options.src === null){             return;         }           this.container = this.element;           this._updateContainerInfo();           //init container         this.container.css("overflow","hidden");           if(this.options.update_on_resize == true)         {             $(window).resize(function()             {                 me._updateContainerInfo();             });         }           this.img_object = new $.ui.iviewer.ImageObject(this.options.zoom_animation);           if (this.options.mousewheel) {             this.img_object.object()                 .mousewheel(function(ev, delta)                 {                     //this event is there instead of containing div, because                     //at opera it triggers many times on div                     var zoom = (delta > 0)?1:-1,                         container_offset = me.container.offset(),                         mouse_pos = {                             x: ev.pageX - container_offset.left,                             y: ev.pageY - container_offset.top                         };                       me.zoom_by(zoom, mouse_pos);                     return false;                 });               if (gesturesSupport) {                 var gestureThrottle = +new Date();                 var originalScale, originalCenter;                 this.img_object.object()                     // .bind('gesturestart', function(ev) {                     .bind('touchstart', function(ev) {                         originalScale = me.current_zoom;                         var touches = ev.originalEvent.touches,                             container_offset;                         if (touches.length == 2) {                             container_offset = me.container.offset();                             originalCenter = {                                 x: (touches[0].pageX + touches[1].pageX) / 2  - container_offset.left,                                 y: (touches[0].pageY + touches[1].pageY) / 2 - container_offset.top                             };                         } else {                             originalCenter = null;                         }                     }).bind('gesturechange', function(ev) {                         //do not want to import throttle function from underscore                         var d = +new Date();                         if ((d - gestureThrottle) < 50) { return; }                         gestureThrottle = d;                         var zoom = originalScale * ev.originalEvent.scale;                         me.set_zoom(zoom, originalCenter);                         ev.preventDefault();                     }).bind('gestureend', function(ev) {                         originalCenter = null;                     });             }         }           //init object         this.img_object.object()             //bind mouse events             .click(function(e){return me._click(e)})                 .prependTo(this.container);           this.container.bind('mousemove', function(ev) { me._handleMouseMove(ev); });           this.loadImage(this.options.src);           if(!this.options.ui_disabled)         {             this.createui();         }           this._mouseInit();     },       destroy: function() {         this._mouseDestroy();     },       _updateContainerInfo: function()     {         this.options.height = this.container.height();         this.options.width = this.container.width();     },       loadImage: function( src )     {         this.current_zoom = this.options.zoom;         var me = this;           this._trigger('onStartLoad', 0, src);           this.container.addClass("iviewer_loading");         this.img_object.load(src, function() {             me._imageLoaded(src);         });     },       _imageLoaded: function(src) {         this.container.removeClass("iviewer_loading");         this.container.addClass("iviewer_cursor");           if(this.options.zoom == "fit"){             this.fit(true);         }         else {             this.set_zoom(this.options.zoom, true);         }           this._trigger('onFinishLoad', 0, src);     },       /**     * fits image in the container     *     * @param {boolean} skip_animation     **/     fit: function(skip_animation)     {         var aspect_ratio = this.img_object.orig_width() / this.img_object.orig_height();         var window_ratio = this.options.width /  this.options.height;         var choose_left = (aspect_ratio > window_ratio);         var new_zoom = 0;           if(choose_left){             new_zoom = this.options.width / this.img_object.orig_width() * 100;         }         else {             new_zoom = this.options.height / this.img_object.orig_height() * 100;         }         this.set_zoom(new_zoom, skip_animation);     },       /**     * center image in container     **/     center: function()     {         this.setCoords(-Math.round((this.img_object.display_width() - this.options.width)/2),                 -Math.round((this.img_object.display_height() - this.options.height)/2));     },       /**     *   move a point in container to the center of display area     *   @param x a point in container     *   @param y a point in container     **/     moveTo: function(x, y)     {         var dx = x-Math.round(this.options.width/2);         var dy = y-Math.round(this.options.height/2);           var new_x = this.img_object.x() - dx;         var new_y = this.img_object.y() - dy;           this.setCoords(new_x, new_y);     },       /**      * Get container offset object.      */     getContainerOffset: function() {         return jQuery.extend({}, this.container.offset());     },       /**     * set coordinates of upper left corner of image object     **/     setCoords: function(x,y)     {         //do nothing while image is being loaded         if(!this.img_object.loaded()) { return; }           var coords = this._correctCoords(x,y);         this.img_object.x(coords.x);         this.img_object.y(coords.y);     },       _correctCoords: function( x, y )     {         x = parseInt(x, 10);         y = parseInt(y, 10);           //check new coordinates to be correct (to be in rect)         if(y > 0){             y = 0;         }         if(x > 0){             x = 0;         }         if(y + this.img_object.display_height() < this.options.height){             y = this.options.height - this.img_object.display_height();         }         if(x + this.img_object.display_width() < this.options.width){             x = this.options.width - this.img_object.display_width();         }         if(this.img_object.display_width() <= this.options.width){             x = -(this.img_object.display_width() - this.options.width)/2;         }         if(this.img_object.display_height() <= this.options.height){             y = -(this.img_object.display_height() - this.options.height)/2;         }           return { x: x, y:y };     },         /**     * convert coordinates on the container to the coordinates on the image (in original size)     *     * @return object with fields x,y according to coordinates or false     * if initial coords are not inside image     **/     containerToImage : function (x,y)     {         var coords = { x : x - this.img_object.x(),                  y :  y - this.img_object.y()         };           coords = this.img_object.toOriginalCoords(coords);           return { x :  util.descaleValue(coords.x, this.current_zoom),                  y :  util.descaleValue(coords.y, this.current_zoom)         };     },       /**     * convert coordinates on the image (in original size, and zero angle) to the coordinates on the container     *     * @return object with fields x,y according to coordinates     **/     imageToContainer : function (x,y)     {         var coords = {                 x : util.scaleValue(x, this.current_zoom),                 y : util.scaleValue(y, this.current_zoom)             };           return this.img_object.toRealCoords(coords);     },       /**     * get mouse coordinates on the image     * @param e - object containing pageX and pageY fields, e.g. mouse event object     *     * @return object with fields x,y according to coordinates or false     * if initial coords are not inside image     **/     _getMouseCoords : function(e)     {         var containerOffset = this.container.offset();             coords = this.containerToImage(e.pageX - containerOffset.left, e.pageY - containerOffset.top);           return coords;     },       /**     * set image scale to the new_zoom     *     * @param {number} new_zoom image scale in %     * @param {boolean} skip_animation     * @param {x: number, y: number} Coordinates of point the should not be moved on zoom. The default is the center of image.     **/     set_zoom: function(new_zoom, skip_animation, zoom_center)     {         if (this._trigger('onZoom', 0, new_zoom) == false) {             return;         }           //do nothing while image is being loaded         if(!this.img_object.loaded()) { return; }           zoom_center = zoom_center || {             x: Math.round(this.options.width/2),             y: Math.round(this.options.height/2)         }           if(new_zoom <  this.options.zoom_min)         {             new_zoom = this.options.zoom_min;         }         else if(new_zoom > this.options.zoom_max)         {             new_zoom = this.options.zoom_max;         }           /* we fake these values to make fit zoom properly work */         if(this.current_zoom == "fit")         {             var old_x = zoom_center.x + Math.round(this.img_object.orig_width()/2);             var old_y = zoom_center.y + Math.round(this.img_object.orig_height()/2);             this.current_zoom = 100;         }         else {             var old_x = -this.img_object.x() + zoom_center.x;             var old_y = -this.img_object.y() + zoom_center.y         }           var new_width = util.scaleValue(this.img_object.orig_width(), new_zoom);         var new_height = util.scaleValue(this.img_object.orig_height(), new_zoom);         var new_x = util.scaleValue( util.descaleValue(old_x, this.current_zoom), new_zoom);         var new_y = util.scaleValue( util.descaleValue(old_y, this.current_zoom), new_zoom);           new_x = zoom_center.x - new_x;         new_y = zoom_center.y - new_y;           new_width = Math.floor(new_width);         new_height = Math.floor(new_height);         new_x = Math.floor(new_x);         new_y = Math.floor(new_y);           this.img_object.display_width(new_width);         this.img_object.display_height(new_height);           var coords = this._correctCoords( new_x, new_y ),             self = this;           this.img_object.setImageProps(new_width, new_height, coords.x, coords.y,                                         skip_animation, function() {             self._trigger('onAfterZoom', 0, new_zoom );         });         this.current_zoom = new_zoom;           this.update_status();     },       /**     * changes zoom scale by delta     * zoom is calculated by formula: zoom_base * zoom_delta^rate     * @param Integer delta number to add to the current multiplier rate number     * @param {x: number, y: number=} Coordinates of point the should not be moved on zoom.     **/     zoom_by: function(delta, zoom_center)     {         var closest_rate = this.find_closest_zoom_rate(this.current_zoom);           var next_rate = closest_rate + delta;         var next_zoom = this.options.zoom_base * Math.pow(this.options.zoom_delta, next_rate)         if(delta > 0 && next_zoom < this.current_zoom)         {             next_zoom *= this.options.zoom_delta;         }           if(delta < 0 && next_zoom > this.current_zoom)         {             next_zoom /= this.options.zoom_delta;         }           this.set_zoom(next_zoom, undefined, zoom_center);     },       /**     * Rotate image     * @param {num} deg Degrees amount to rotate. Positive values rotate image clockwise.     *     Currently 0, 90, 180, 270 and -90, -180, -270 values are supported     *     * @param {boolean} abs If the flag is true if, the deg parameter will be considered as     *     a absolute value and relative otherwise.     * @return {num|null} Method will return current image angle if called without any arguments.     **/     angle: function(deg, abs) {         if (arguments.length === 0) { return this.img_object.angle(); }           if (deg < -270 || deg > 270 || deg % 90 !== 0) { return; }         if (!abs) { deg += this.img_object.angle(); }         if (deg < 0) { deg += 360; }         if (deg >= 360) { deg -= 360; }           if (deg === this.img_object.angle()) { return; }           this.img_object.angle(deg);         //the rotate behavior is different in all editors. For now we  just center the         //image. However, it will be better to try to keep the position.         this.center();         this._trigger('angle', 0, { angle: this.img_object.angle() });     },       /**     * finds closest multiplier rate for value     * basing on zoom_base and zoom_delta values from settings     * @param Number value zoom value to examine     **/     find_closest_zoom_rate: function(value)     {         if(value == this.options.zoom_base)         {             return 0;         }           function div(val1,val2) { return val1 / val2 };         function mul(val1,val2) { return val1 * val2 };           var func = (value > this.options.zoom_base)?mul:div;         var sgn = (value > this.options.zoom_base)?1:-1;           var mltplr = this.options.zoom_delta;         var rate = 1;           while(Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate)) - value) >               Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate+1)) - value))         {             rate++;         }           return sgn * rate;     },       /* update scale info in the container */     update_status: function()     {         if(!this.options.ui_disabled)         {             var percent = Math.round(100*this.img_object.display_height()/this.img_object.orig_height());             if(percent)             {                 this.zoom_object.html(percent + "%");             }         }     },       /**      * Get some information about the image.      *     Currently orig_(width|height), display_(width|height), angle, zoom and src params are supported.      *      *  @param {string} parameter to check      *  @param {boolean} withoutRotation if param is orig_width or orig_height and this flag is set to true,      *      method will return original image width without considering rotation.      *      */     info: function(param, withoutRotation) {         if (!param) { return; }           switch (param) {             case 'orig_width':             case 'orig_height':                 if (withoutRotation) {                     return (this.img_object.angle() % 180 === 0 ? this.img_object[param]() :                             param === 'orig_width' ? this.img_object.orig_height() :                                                         this.img_object.orig_width());                 } else {                     return this.img_object[param]();                 }             case 'display_width':             case 'display_height':             case 'angle':                 return this.img_object[param]();             case 'zoom':                 return this.current_zoom;             case 'src':                 return this.img_object.object().attr('src');             case 'coords':                 return {                     x: this.img_object.x(),                     y: this.img_object.y()                 };         }     },       /**     *   callback for handling mousdown event to start dragging image     **/     _mouseStart: function( e )     {         $.ui.mouse.prototype._mouseStart.call(this, e);         if (this._trigger('onStartDrag', 0, this._getMouseCoords(e)) === false) {             return false;         }           /* start drag event*/         this.container.addClass("iviewer_drag_cursor");           //#10: fix movement quirks for ipad         this._dragInitialized = !(e.originalEvent.changedTouches && e.originalEvent.changedTouches.length==1);           this.dx = e.pageX - this.img_object.x();         this.dy = e.pageY - this.img_object.y();         return true;     },       _mouseCapture: function( e ) {         return true;     },       /**      * Handle mouse move if needed. User can avoid using this callback, because      *    he can get the same information through public methods.      *  @param {jQuery.Event} e      */     _handleMouseMove: function(e) {         this._trigger('onMouseMove', e, this._getMouseCoords(e));     },       /**     *   callback for handling mousemove event to drag image     **/     _mouseDrag: function(e)     {         $.ui.mouse.prototype._mouseDrag.call(this, e);           //#10: imitate mouseStart, because we can get here without it on iPad for some reason         if (!this._dragInitialized) {             this.dx = e.pageX - this.img_object.x();             this.dy = e.pageY - this.img_object.y();             this._dragInitialized = true;         }           var ltop =  e.pageY - this.dy;         var lleft = e.pageX - this.dx;           this.setCoords(lleft, ltop);         this._trigger('onDrag', e, this._getMouseCoords(e));         return false;     },       /**     *   callback for handling stop drag     **/     _mouseStop: function(e)     {         $.ui.mouse.prototype._mouseStop.call(this, e);         this.container.removeClass("iviewer_drag_cursor");         this._trigger('onStopDrag', 0, this._getMouseCoords(e));     },       _click: function(e)     {         this._trigger('onClick', 0, this._getMouseCoords(e));     },       /**     *   create zoom buttons info box     **/     createui: function()     {         var me=this;           $("<div>", { 'class': "iviewer_zoom_in iviewer_common iviewer_button"})                     .bind('mousedown touchstart',function(){me.zoom_by(1); return false;})                     .appendTo(this.container);           $("<div>", { 'class': "iviewer_zoom_out iviewer_common iviewer_button"})                     .bind('mousedown touchstart',function(){me.zoom_by(- 1); return false;})                     .appendTo(this.container);           $("<div>", { 'class': "iviewer_zoom_zero iviewer_common iviewer_button"})                     .bind('mousedown touchstart',function(){me.set_zoom(100); return false;})                     .appendTo(this.container);           $("<div>", { 'class': "iviewer_zoom_fit iviewer_common iviewer_button"})                     .bind('mousedown touchstart',function(){me.fit(this); return false;})                     .appendTo(this.container);           this.zoom_object = $("<div>").addClass("iviewer_zoom_status iviewer_common")                                     .appendTo(this.container);           $("<div>", { 'class': "iviewer_rotate_left iviewer_common iviewer_button"})                     .bind('mousedown touchstart',function(){me.angle(-90); return false;})                     .appendTo(this.container);           $("<div>", { 'class': "iviewer_rotate_right iviewer_common iviewer_button" })                     .bind('mousedown touchstart',function(){me.angle(90); return false;})                     .appendTo(this.container);           this.update_status(); //initial status update     }   } );   /**  * @class $.ui.iviewer.ImageObject Class represents image and provides public api without  *     extending image prototype.  * @constructor  * @param {boolean} do_anim Do we want to animate image on dimension changes?  */ $.ui.iviewer.ImageObject = function(do_anim) {     this._img = $("<img>")             //this is needed, because chromium sets them auto otherwise             .css({ position: "absolute", top :"0px", left: "0px"});       this._loaded = false;     this._swapDimensions = false;     this._do_anim = do_anim || false;     this.x(0, true);     this.y(0, true);     this.angle(0); };     /** @lends $.ui.iviewer.ImageObject.prototype */ (function() {     /**      * Restore initial object state.      *      * @param {number} w Image width.      * @param {number} h Image height.      */     this._reset = function(w, h) {         this._angle = 0;         this._swapDimensions = false;         this.x(0);         this.y(0);           this.orig_width(w);         this.orig_height(h);         this.display_width(w);         this.display_height(h);     };       /**      * Check if image is loaded.      *      * @return {boolean}      */     this.loaded = function() { return this._loaded; };       /**      * Load image.      *      * @param {string} src Image url.      * @param {Function=} loaded Function will be called on image load.      */     this.load = function(src, loaded) {         var self = this;           loaded = loaded || jQuery.noop;         this._loaded = false;           //If we assign new image url to the this._img IE9 fires onload event and image width and         //height are set to zero. So, we create another image object and load image through it.         var img = new Image();         img.onload = function() {             self._loaded = true;             self._reset(this.width, this.height);               self._img                 .removeAttr("src")                 .removeAttr("width")                 .removeAttr("height")                 .removeAttr("style")                 //max-width is reset, because plugin breaks in the twitter bootstrap otherwise                 .css({ position: "absolute", top :"0px", left: "0px", maxWidth: "none"})               self._img[0].src = src;             loaded();         };           img.src = src;         this.angle(0);     };       this._dimension = function(prefix, name) {         var horiz = '_' + prefix + '_' + name,             vert = '_' + prefix + '_' + (name === 'height' ? 'width' : 'height');         return setter(function(val) {                 this[this._swapDimensions ? horiz: vert] = val;             },             function() {                 return this[this._swapDimensions ? horiz: vert];             });     };       /**      * Getters and setter for common image dimensions.      *    display_ means real image tag dimensions      *    orig_ means physical image dimensions.      *  Note, that dimensions are swapped if image is rotated. It necessary,      *  because as little as possible code should know about rotation.      */     this.display_width = this._dimension('display', 'width'),     this.display_height = this._dimension('display', 'height'),     this.display_diff = function() { return Math.floor( this.display_width() - this.display_height() ) };     this.orig_width = this._dimension('orig', 'width'),     this.orig_height = this._dimension('orig', 'height'),       /**      * Setter for  X coordinate. If image is rotated we need to additionaly shift an      *     image to map image coordinate to the visual position.      *      * @param {number} val Coordinate value.      * @param {boolean} skipCss If true, we only set the value and do not touch the dom.      */     this.x = setter(function(val, skipCss) {             this._x = val;             if (!skipCss) {                 this._img.css("left",this._x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px");             }         },         function() {             return this._x;         });       /**      * Setter for  Y coordinate. If image is rotated we need to additionaly shift an      *     image to map image coordinate to the visual position.      *      * @param {number} val Coordinate value.      * @param {boolean} skipCss If true, we only set the value and do not touch the dom.      */     this.y = setter(function(val, skipCss) {             this._y = val;             if (!skipCss) {                 this._img.css("top",this._y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px");             }         },        function() {             return this._y;        });       /**      * Perform image rotation.      *      * @param {number} deg Absolute image angle. The method will work with values 0, 90, 180, 270 degrees.      */     this.angle = setter(function(deg) {             var prevSwap = this._swapDimensions;               this._angle = deg;             this._swapDimensions = deg % 180 !== 0;                           if (prevSwap !== this._swapDimensions) {                 var verticalMod = this._swapDimensions ? -1 : 1;                 this.x(this.x() - verticalMod * this.display_diff() / 2, true);                 this.y(this.y() + verticalMod * this.display_diff() / 2, true);             };               var cssVal = 'rotate(' + deg + 'deg)',                 img = this._img;               jQuery.each(['', '-webkit-', '-moz-', '-o-', '-ms-'], function(i, prefix) {                 img.css(prefix + 'transform', cssVal);             });               if (useIeTransforms) {                 jQuery.each(['-ms-', ''], function(i, prefix) {                     img.css(prefix + 'filter', ieTransforms[deg].filter);                 });                   img.css({                     marginLeft: ieTransforms[deg].marginLeft * this.display_diff() / 2,                     marginTop: ieTransforms[deg].marginTop * this.display_diff() / 2                 });             }         },        function() { return this._angle; });       /**      * Map point in the container coordinates to the point in image coordinates.      *     You will get coordinates of point on image with respect to rotation,      *     but will be set as if image was not rotated.      *     So, if image was rotated 90 degrees, it's (0,0) point will be on the      *     top right corner.      *      * @param {{x: number, y: number}} point Point in container coordinates.      * @return  {{x: number, y: number}}      */     this.toOriginalCoords = function(point) {         switch (this.angle()) {             case 0: return { x: point.x, y: point.y }             case 90: return { x: point.y, y: this.display_width() - point.x }             case 180: return { x: this.display_width() - point.x, y: this.display_height() - point.y }             case 270: return { x: this.display_height() - point.y, y: point.x }         }     };       /**      * Map point in the image coordinates to the point in container coordinates.      *     You will get coordinates of point on container with respect to rotation.      *     Note, if image was rotated 90 degrees, it's (0,0) point will be on the      *     top right corner.      *      * @param {{x: number, y: number}} point Point in container coordinates.      * @return  {{x: number, y: number}}      */     this.toRealCoords = function(point) {         switch (this.angle()) {             case 0: return { x: this.x() + point.x, y: this.y() + point.y }             case 90: return { x: this.x() + this.display_width() - point.y, y: this.y() + point.x}             case 180: return { x: this.x() + this.display_width() - point.x, y: this.y() + this.display_height() - point.y}             case 270: return { x: this.x() + point.y, y: this.y() + this.display_height() - point.x}         }     };       /**      * @return {jQuery} Return image node. this is needed to add event handlers.      */     this.object = setter(jQuery.noop,                            function() { return this._img; });       /**      * Change image properties.      *      * @param {number} disp_w Display width;      * @param {number} disp_h Display height;      * @param {number} x      * @param {number} y      * @param {boolean} skip_animation If true, the animation will be skiped despite the      *     value set in constructor.      * @param {Function=} complete Call back will be fired when zoom will be complete.      */     this.setImageProps = function(disp_w, disp_h, x, y, skip_animation, complete) {         complete = complete || jQuery.noop;           this.display_width(disp_w);         this.display_height(disp_h);         this.x(x, true);         this.y(y, true);           var w = this._swapDimensions ? disp_h : disp_w;         var h = this._swapDimensions ? disp_w : disp_h;           var params = {             width: w,             height: h,             top: y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px",             left: x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px"         };           if (useIeTransforms) {             jQuery.extend(params, {                 marginLeft: ieTransforms[this.angle()].marginLeft * this.display_diff() / 2,                 marginTop: ieTransforms[this.angle()].marginTop * this.display_diff() / 2             });         }           var swapDims = this._swapDimensions,             img = this._img;           //here we come: another IE oddness. If image is rotated 90 degrees with a filter, than         //width and height getters return real width and height of rotated image. The bad news         //is that to set height you need to set a width and vice versa. Fuck IE.         //So, in this case we have to animate width and height manually.         if(useIeTransforms && swapDims) {             var ieh = this._img.width(),                 iew = this._img.height(),                 iedh = params.height - ieh;                 iedw = params.width - iew;               delete params.width;             delete params.height;         }           if (this._do_anim && !skip_animation) {             this._img.stop(true)                 .animate(params, {                     duration: 200,                     complete: complete,                     step: function(now, fx) {                         if(useIeTransforms && swapDims && (fx.prop === 'top')) {                             var percent = (now - fx.start) / (fx.end - fx.start);                               img.height(ieh + iedh * percent);                             img.width(iew + iedw * percent);                             img.css('top', now);                         }                     }                 });         } else {             this._img.css(params);             setTimeout(complete, 0); //both if branches should behave equally.         }     };   }).apply($.ui.iviewer.ImageObject.prototype);       var util = {     scaleValue: function(value, toZoom)     {         return value * toZoom / 100;     },       descaleValue: function(value, fromZoom)     {         return value * 100 / fromZoom;     } };    } )( jQuery, undefined );

 

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<!DOCTYPE html> <html>     <head>         <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />         <title>jquery.iviewer test</title>         <script type="text/javascript" src="jquery.js" ></script>         <script type="text/javascript" src="jqueryui.js" ></script>         <script type="text/javascript" src="jquery.mousewheel.min.js" ></script>         <script type="text/javascript" src="jquery.iviewer.js" ></script>         <script type="text/javascript">             var $ = jQuery;             $(document).ready(function(){                   var iv1 = $("#viewer").iviewer({                        src: "test_image.jpg",                        update_on_resize: false,                        zoom_animation: false,                        mousewheel: false,                        onMouseMove: function(ev, coords) { },                        onStartDrag: function(ev, coords) { return false; }, //this image will not be dragged                        onDrag: function(ev, coords) { }                   });                      $("#in").click(function(){ iv1.iviewer('zoom_by', 1); });                    $("#out").click(function(){ iv1.iviewer('zoom_by', -1); });                    $("#fit").click(function(){ iv1.iviewer('fit'); });                    $("#orig").click(function(){ iv1.iviewer('set_zoom', 100); });                    $("#update").click(function(){ iv1.iviewer('update_container_info'); });                     var iv2 = $("#viewer2").iviewer(                   {                       src: "test_image2.jpg"                   });                     $("#chimg").click(function()                   {                     iv2.iviewer('loadImage', "test_image.jpg");                     return false;                   });             });         </script>         <link rel="stylesheet" href="jquery.iviewer.css" />         <style>             .viewer             {                 width: 50%;                 height: 500px;                 border: 1px solid black;                 position: relative;             }                           .wrapper             {                 overflow: hidden;             }         </style>     </head>     <body>         <h1>JQuery.iviewer test</h1>         <!-- wrapper div is needed for opera because it shows scroll bars for reason -->         <div class="wrapper">             <span>                 <a id="in" href="#">+</a>                 <a id="out" href="#">-</a>                 <a id="fit" href="#">fit</a>                 <a id="orig" href="#">orig</a>                 <a id="update" href="#">update</a>             </span>             <div id="viewer" class="viewer"></div>             <br />             <div id="viewer2" class="viewer"></div>             <br />             <p><a href="#" id="chimg">Change Image</a></p>         </div>     </body> </html>

 效果圖：