fabric.js 翻转,复制粘贴,隐藏, 删除,历史记录,撤销, 剪切, 图层,组合打散,锁定等功能
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | 用vue写的 显示,隐藏 hide(){ this.canvas.getActiveObject().set('opacity', 0).setCoords(); this.canvas.requestRenderAll() }, display(){ this.canvas.getActiveObject().set('opacity', 1).setCoords(); this.canvas.requestRenderAll() }, 翻转 水平 垂直用scaleY flip(){ this.canvas.getActiveObject().set('scaleX', -1).setCoords(); this.canvas.requestRenderAll(); }, 克隆(复制粘贴) paste(_clipboard){ // clone again, so you can do multiple copies. let canvas = this.canvas; _clipboard.clone(function(clonedObj) { canvas.discardActiveObject(); clonedObj.set({ left: clonedObj.left + 20, top: clonedObj.top + 20, evented: true, }); if (clonedObj.type === 'activeSelection') { // active selection needs a reference to the canvas. clonedObj.canvas = canvas; clonedObj.forEachObject(function(obj) { canvas.add(obj); }); // this should solve the unselectability clonedObj.setCoords(); } else { canvas.add(clonedObj); } _clipboard.top += 20; _clipboard.left += 20; canvas.setActiveObject(clonedObj); // canvas.requestRenderAll(); }); }, copy(){ let canvas = this.canvas; var _self = this; canvas.getActiveObject().clone(function(cloned){ // let _clipboard = cloned; _self.paste(cloned); }) }, 历史记录,回退撤销 data 初始化 config : { canvasState : [], currentStateIndex : -1, redoStatus : false, //撤销状态 undoStatus : false, // 重做状态 undoFinishedStatus : 1, redoFinishedStatus : 1, undoButton : this.$refs.undo, //得不到 在 mounted 得到 redoButton : this.$refs.redo, } 记录事件 canvasDataChange(){ let _self = this; this.canvas.on('object:modified', function(){ _self.updateCanvasState(); }); this.canvas.on('object:added', function(){ _self.updateCanvasState() }); this.canvas.on('object:removed', function(){ _self.updateCanvasState() }); this.canvas.on('object:rotating', function(){ _self.updateCanvasState() }); }, undo() { let _self =this; if(this.config.undoFinishedStatus){ if(this.config.currentStateIndex == -1){ this.config.undoStatus = false; } else{ if (this.config.canvasState.length >= 1) { this.config.undoFinishedStatus = 0; if(this.config.currentStateIndex != 0){ this.config.undoStatus = true; this.canvas.loadFromJSON(this.config.canvasState[this.config.currentStateIndex-1],function(){ var jsonData = JSON.parse(_self.config.canvasState[_self.config.currentStateIndex-1]); _self.canvas.renderAll(); _self.config.undoStatus = false; _self.config.currentStateIndex -= 1; // _self.config.undoButton.removeAttribute("disabled"); // _self.config.undoButton.disabled = false; if(_self.config.currentStateIndex !== _self.config.canvasState.length-1){ // _self.config.redoButton.removeAttribute('disabled'); // _self.config.redoButton.disabled = false; } _self.config.undoFinishedStatus = 1; }); } else if(_self.config.currentStateIndex == 0){ _self.canvas.clear(); _self.config.undoFinishedStatus = 1; // _self.config.undoButton.disabled= "disabled"; // _self.config.redoButton.removeAttribute('disabled'); // _self.config.redoButton.disabled = false; _self.config.currentStateIndex -= 1; } } } } }, redo() { let _self = this; if(this.config.redoFinishedStatus){ if((this.config.currentStateIndex == this.config.canvasState.length-1) && this.config.currentStateIndex != -1){ // this.config.redoButton.disabled= true; }else{ if(this.config.canvasState.length > this.config.currentStateIndex && this.config.canvasState.length != 0){ this.config.redoFinishedStatus = 0; this.config.redoStatus = true; this.canvas.loadFromJSON(this.config.canvasState[this.config.currentStateIndex+1],function(){ var jsonData = JSON.parse(_self.config.canvasState[_self.config.currentStateIndex+1]); _self.canvas.renderAll(); _self.config.redoStatus = false; _self.config.currentStateIndex += 1; if(_self.config.currentStateIndex != -1){ // _self.config.redoButton.disabled = false; } _self.config.redoFinishedStatus = 1; if((_self.config.currentStateIndex == _self.config.canvasState.length-1) && _self.config.currentStateIndex != -1){ // _self.config.redoButton.disabled= true; } }); } } } }, 删除 del() { var el = this.canvas.getActiveObject(); this.canvas.remove(el); }, 格式化 数据 toJson(){ console.log(JSON.stringify(this.canvas.toJSON())); }, toSVG(){ // return this.canvas.toSVG() console.log(this.canvas.toSVG()); }, canvas导出为图片并下载 canvasToImage(){ var MIME_TYPE = "image/png"; //转换成base64 var imgURL = this.canvas.toDataURL(MIME_TYPE); //创建一个a链接,模拟点击下载 var dlLink = document.createElement('a'); var filename = '个人画板_' + (new Date()).getTime() + '.png'; dlLink.download = filename; dlLink.href = imgURL; dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(':'); document.body.appendChild(dlLink); dlLink.click(); document.body.removeChild(dlLink); }, 或者 downloadimage(event){ // 图片导出为 png 格式 var type = 'png'; // 返回一个包含JPG图片的< img >元素 var img_png_src = this.canvas.toDataURL("image/png"); //将画板保存为图片格式的函数 var imgData = img_png_src.replace(this._fixType(type),'image/octet-stream'); var filename = '个人画板_' + (new Date()).getTime() + '.' + type; this.saveFile(imgData,filename); }, saveFile(data, filename){ var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a'); save_link.href = data; save_link.download = filename; var event = document.createEvent('MouseEvents'); event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); save_link.dispatchEvent(event); }, _fixType(type) { type = type.toLowerCase().replace(/jpg/i, 'jpeg'); var r = type.match(/png|jpeg|bmp|gif/)[0]; return 'image/' + r; }, 组合 打散 group() { this.fabricAction.fabricObjGroup(this); }, ungroup() { this.fabricAction.fabricObjUnGroup(this); }, 锁定 lock() { this.fabricAction.lockOption(this); }, |
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