├── .gitattributes ├── .gitignore ├── DistSnapScreen.html ├── LICENSE ├── README.md ├── SnapScreeServer.zip ├── css └── DistSnapScreen.css └── js ├── DistSnapScreen.js └── jquery-2.2.4.min.js /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | 4 | # Custom for Visual Studio 5 | *.cs diff=csharp 6 | 7 | # Standard to msysgit 8 | *.doc diff=astextplain 9 | *.DOC diff=astextplain 10 | *.docx diff=astextplain 11 | *.DOCX diff=astextplain 12 | *.dot diff=astextplain 13 | *.DOT diff=astextplain 14 | *.pdf diff=astextplain 15 | *.PDF diff=astextplain 16 | *.rtf diff=astextplain 17 | *.RTF diff=astextplain 18 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Windows image file caches 2 | Thumbs.db 3 | ehthumbs.db 4 | 5 | # Folder config file 6 | Desktop.ini 7 | 8 | # Recycle Bin used on file shares 9 | $RECYCLE.BIN/ 10 | 11 | # Windows Installer files 12 | *.cab 13 | *.msi 14 | *.msm 15 | *.msp 16 | 17 | # Windows shortcuts 18 | *.lnk 19 | 20 | # ========================= 21 | # Operating System Files 22 | # ========================= 23 | 24 | # OSX 25 | # ========================= 26 | 27 | .DS_Store 28 | .AppleDouble 29 | .LSOverride 30 | 31 | # Thumbnails 32 | ._* 33 | 34 | # Files that might appear on external disk 35 | .Spotlight-V100 36 | .Trashes 37 | 38 | # Directories potentially created on remote AFP share 39 | .AppleDB 40 | .AppleDesktop 41 | Network Trash Folder 42 | Temporary Items 43 | .apdisk 44 | -------------------------------------------------------------------------------- /DistSnapScreen.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 23 | 24 | 25 | 26 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 最近因为产品需要，用js 写了一个能网页截图并涂鸦的js库(类似QQ 截图工具)。这个库与html2canvas 等类似的库有巨大的差异:html2canvas 只能做到截取“网页”的部分元素类型，而网页之外的内容(浏览器窗口之外)，或者跨域的iframe，java applet 等元素是无法截取的。而我们的需求是要能截取桌面上的任何东西，不限窗口和元素类型，换言之：要做一个类似“QQ 截图工具“的js库来在网页上使用。 2 | 3 | 所以就只能自己琢磨了,我们的产品用的是dojo，所以我最开始写的是一个dojo的widget，后来又单独写成了一个jquery的插件，如下使用即可： 4 | 5 | ![这里写图片描述](http://imglf2.ph.126.net/3qh9GeT1jt0PtCMN8mH0cQ==/6631831926279972386.png) 6 | 7 | 初始化的参数就是图片上传的相关地址，demo 效果如下： 8 | 9 | ![这里写图片描述](http://imglf2.ph.126.net/3tVZN3SgwkOVwByBs4mHpg==/4874865121752669899.png) 10 | 11 | 当点击截图后，鼠标状态会变成截图状态，然后拉取桌面的任意一个区域即可： 12 | 13 | ![这里写图片描述](http://imglf1.ph.126.net/d9swzoqZZoeF1eMQJbzKpQ==/4863324647708399071.png) 14 | 15 | 截取到的区域会“立刻绘制到页面的canvas“（严格来说，图片此时还没有绘制到画布上，后面有介绍）中，在这里我也添加了一些操作到画布上，比如添加文字、矩形、圆，设置颜色等，如下所示： 16 | 17 | ![这里写图片描述](http://imglf0.ph.126.net/FpfhvdyGBHCkhNCVmgdXTQ==/6631739567303236395.png) 18 | 19 | 各种操作完成之后，点击确定即可： 20 | 21 | ![这里写图片描述](http://imglf0.ph.126.net/aBRyaz96OXRF5LfxuFHsvA==/6631666999535804970.png) 22 | 23 | 图片就会插入到编辑框中，查看dom: 24 | 25 | ![这里写图片描述](http://imglf0.ph.126.net/1pPJCNZJU4vKxRoGX7v51Q==/6631790144838114030.png) 26 | 27 | 如上就是完整的过程，当然，也可以只截图不涂鸦。这里说下相关的注意事项： 28 | 29 | > 前提： 30 | > >1. 安装一个截图插件(如果你会C++，可以查看我的这边文章[《兼容各大浏览器的插件开发》](http://www.chenyp.com/2015/09/11/browser-plugin/) 了解如何开发浏览器插件； 31 | > 32 | > >2. 启动图片上传的服务器(允许跨域)。 33 | > 34 | >流程 35 | >>1. 点击截图，调用插件的方法来截图，完成后，插件会把图片上传到服务器中，并将上传后的地址返回给前端； 36 | >>2. 前端拿到地址后，将此地址当作canvas画布的背景(因为橡皮擦的功能设计，这个时候并不会将图片绘制到canvas上，而是当点击确定后，再把图片绘制到canvas上)，img 的crossOrigin 设为anonymous(如果没跨域就不需要)； 37 | >>3. 各种操作……. (注意，点击橡皮擦时，要将canvas.context.globalCompositeOperation设为destination-out)； 38 | >>4. 点击确定，绘制图片到canvas上，要将canvas.context.globalCompositeOperation设为destination-over； 39 | >>5. 然后通过canvas.toDataURL("image/png")即可取到涂鸦后的图片了。 40 | > 41 | >涂鸦状态中的dom 结构如下所示: 42 | 43 | ![这里写图片描述](http://imglf0.ph.126.net/NteWyr7aaSBrjRTA9MgE2Q==/6631586735186975823.png) 44 | 45 | 可以看到在canvas的下面有一个img，这也就是为什么图片还没绘制到画布上也能看到图片的原因。不足之处，请多多指教。 46 | -------------------------------------------------------------------------------- /SnapScreeServer.zip: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/DistChen/DistSnapScreen/af2e4194fa508486ab5f0fe55ec4d8c37a1b7ad9/SnapScreeServer.zip -------------------------------------------------------------------------------- /css/DistSnapScreen.css: -------------------------------------------------------------------------------- 1 | .SnapContainer{ 2 | position: fixed; 3 | top: 0px; 4 | left: 0px; 5 | bottom: 0px; 6 | right: 0px; 7 | background-color: rgba(0,0,0,0.5); 8 | display: none; 9 | } 10 | .SnapContainer > div{ 11 | position: absolute; 12 | background-color: #ffffff; 13 | display: none; 14 | } 15 | .SnapContainerCanvas { 16 | } 17 | .SnapContainerCanvas > img{ 18 | position: absolute; 19 | left: 0px; 20 | top: 0px; 21 | -webkit-user-select: none; 22 | -moz-user-select: none; 23 | -ms-user-select: none; 24 | user-select: none; 25 | } 26 | .SnapContainerCanvas > input{ 27 | position: absolute; 28 | display: block; 29 | border: 1px dashed; 30 | outline: none; 31 | background-color: transparent; 32 | display: none; 33 | } 34 | .SnapContainerCanvas > canvas{ 35 | cursor: crosshair; 36 | position: relative; 37 | } 38 | .SnapContainerCanvas > div{ 39 | text-align: right; 40 | background-color: white; 41 | margin-top: -3px; 42 | padding-bottom: 1px; 43 | } 44 | .SnapContainerCanvas > div > button{ 45 | display:inline-block; 46 | outline:none; 47 | border: none; 48 | background-color: #585d68; 49 | color: white; 50 | font-size: 12px; 51 | padding: 2px 8px; 52 | cursor: pointer; 53 | margin-left: -3px; 54 | } 55 | .SnapContainerCanvas > div > button:last-child, 56 | .SnapContainerCanvas > div > .active, 57 | .SnapContainerCanvas > div > button:hover{ 58 | background-color:#f97935; 59 | } 60 | .SnapContainerCanvas > div > button:last-child{ 61 | margin-left: 3px; 62 | } 63 | .SnapContainerDownLoad{ 64 | text-align: center; 65 | width: 340px; 66 | height: 100px; 67 | left: calc(50% - 170px); 68 | top: calc(50% - 50px); 69 | } 70 | .SnapContainerDownLoad a{ 71 | display: inline-block; 72 | height: 30px; 73 | line-height: 30px; 74 | background-color: #f97935; 75 | color: white; 76 | text-decoration: none; 77 | width: 60px; 78 | cursor: pointer; 79 | } 80 | .SnapContainerDownLoad a:last-child{ 81 | margin-left: 5px; 82 | background-color: #585d68; 83 | } -------------------------------------------------------------------------------- /js/DistSnapScreen.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Date：2016/6/5 3 | * Author: DistChen 4 | * Desc：www.chenyp.com 5 | */ 6 | (function (factory) { 7 | if (typeof define === "function" && define.amd) { 8 | define([ "jquery" ], factory); 9 | } else { 10 | factory(jQuery); 11 | } 12 | }(function ($) { 13 | 'use strict'; 14 | 15 | if (typeof $ === 'undefined') { 16 | throw new Error('DistSnapScreen\'s JavaScript requires jQuery'); 17 | } 18 | 19 | var DistSnapScreen=function(){ 20 | this.plugin = null; 21 | this.context = null; 22 | this.snapContainer = null; 23 | this.snapContainerCanvas = null; 24 | this.snapContainerDownLoad = null; 25 | this.img = null; 26 | this.textInput = null; 27 | this.paintType = 1; 28 | }; 29 | 30 | DistSnapScreen.prototype.PaintType={ 31 | Pencil:1, 32 | Eraser:1, 33 | Rect:2, 34 | Circle:3, 35 | Text:4 36 | }; 37 | 38 | DistSnapScreen.prototype.config={ 39 | host:"127.0.0.1", 40 | port:"8080", 41 | serverApp:"SnapScreen", 42 | uploadAction:"/upload.jsp?action=uploadimage" 43 | }; 44 | 45 | DistSnapScreen.prototype.init=function(options){ 46 | $.extend(DistSnapScreen.prototype.config,options); 47 | _insertTemplate.apply(this); 48 | }; 49 | 50 | DistSnapScreen.prototype.snapScreen=function(){ 51 | var result; 52 | try{ 53 | result = this.plugin.saveSnapshot(this.config.host, "/"+this.config.serverApp+this.config.uploadAction, this.config.port); 54 | }catch (e){ 55 | this.snapContainer.show(); 56 | this.snapContainerDownLoad.show(); 57 | this.snapContainerCanvas.hide(); 58 | return ""; 59 | } 60 | result = eval("("+ result +")"); 61 | return "http://"+this.config.host+":"+this.config.port+"/"+this.config.serverApp+"/"+result.url; 62 | }; 63 | 64 | DistSnapScreen.prototype.snapScreenAndScrawl=function(callback){ 65 | var url = this.snapScreen(); 66 | if(url!=""){ 67 | this.callback = callback; 68 | this.snapContainer.show(); 69 | this.snapContainerCanvas.show(); 70 | _renderBackgroundImg.call(this,url); 71 | } 72 | }; 73 | 74 | var _renderBackgroundImg = function(url){ 75 | var widget = this; 76 | this.img.setAttribute('crossOrigin', 'Anonymous'); 77 | this.img.src=url; 78 | this.img.onload = function(){ 79 | var width = widget.img.naturalWidth; 80 | var height = widget.img.naturalHeight; 81 | widget.canvas.width = width; 82 | widget.canvas.height = height; 83 | widget.snapContainerCanvas.css({ 84 | width:width+"px", 85 | height:height+"px", 86 | left:"calc(50% - "+width/2+"px)", 87 | top:"calc(50% - "+height/2+"px)" 88 | }); 89 | _switchBoard.call(widget,{}); 90 | }; 91 | }; 92 | 93 | var _insertTemplate=function(){ 94 | var container = $('

').appendTo(document.body); 95 | _insertSnapContainer.apply(this,container); 96 | _insertSnapPlugin.apply(this,container); 97 | }; 98 | 99 | var _insertSnapContainer = function(container){ 100 | this.snapContainer = $('

').appendTo(container); 101 | _insertSnapContainerCanvas.apply(this); 102 | _insertSnapContainerDownLoad.apply(this); 103 | }; 104 | 105 | var _insertSnapContainerCanvas=function(){ 106 | this.snapContainerCanvas = $('

').appendTo(this.snapContainer); 107 | this.img = $('

').appendTo(this.snapContainerCanvas)[0]; 108 | this.canvas = $('

').appendTo(this.snapContainerCanvas)[0]; 109 | this.textInput = $('').appendTo(this.snapContainerCanvas)[0]; 110 | _registerOpeBtn.apply(this,$("

").appendTo(this.snapContainerCanvas)); 111 | }; 112 | 113 | var _registerOpeBtn=function(container){ 114 | var widget = this; 115 | var activeBtn; 116 | var textBtn = $("").appendTo(container); 117 | textBtn.on("click",function(){ 118 | activeBtn = _activeBtn(activeBtn,textBtn); 119 | _switchBoard.call(widget,{ 120 | paintType:widget.PaintType.Text, 121 | fillStyle:"red", 122 | font:"20px Arial" 123 | }); 124 | }); 125 | var rectBtn = $("").appendTo(container); 126 | rectBtn.on("click",function(){ 127 | activeBtn = _activeBtn(activeBtn,rectBtn); 128 | _switchBoard.call(widget,{ 129 | paintType:widget.PaintType.Rect 130 | }); 131 | }); 132 | var circleBtn = $("").appendTo(container); 133 | circleBtn.on("click",function(){ 134 | activeBtn = _activeBtn(activeBtn,circleBtn); 135 | _switchBoard.call(widget,{ 136 | paintType:widget.PaintType.Circle 137 | }); 138 | }); 139 | var pencilBtn = $("").appendTo(container); 140 | pencilBtn.on("click",function(){ 141 | activeBtn = _activeBtn(activeBtn,pencilBtn); 142 | _switchBoard.call(widget,{ 143 | paintType:widget.PaintType.Pencil 144 | }); 145 | }); 146 | var eraserBtn = $("").appendTo(container); 147 | eraserBtn.on("click",function(){ 148 | activeBtn = _activeBtn(activeBtn,eraserBtn); 149 | _switchBoard.call(widget,{ 150 | paintType:widget.PaintType.Eraser, 151 | lineWidth:10, 152 | globalCompositeOperation:"destination-out" 153 | }); 154 | }); 155 | var okBtn = $("").appendTo(container); 156 | okBtn.on("click",function(){ 157 | widget.context.globalCompositeOperation = "destination-over"; 158 | widget.context.drawImage(widget.img,0,0); 159 | widget.snapContainer.css("display","none"); 160 | widget.snapContainerCanvas.css("display","none"); 161 | widget.callback(widget.canvas.toDataURL("image/png")); 162 | }); 163 | activeBtn = pencilBtn; 164 | activeBtn.addClass("active"); 165 | }; 166 | 167 | var _activeBtn=function(lastBtn,btn){ 168 | lastBtn.removeClass("active"); 169 | btn.addClass("active"); 170 | return btn; 171 | }; 172 | 173 | var _switchBoard = function(paras){ 174 | if(!this.context){ 175 | this.context = this.canvas.getContext("2d"); 176 | _addCanvasEvent.apply(this); 177 | } 178 | this.context.closePath(); 179 | this.paintType = paras.paintType||this.paintType; 180 | this.context.font = paras.font||"14px Arial"; 181 | this.context.lineWidth = paras.lineWidth||3; 182 | this.context.strokeStyle = paras.strokeStyle||"red"; 183 | this.context.fillStyle=paras.fillStyle||"transparent"; 184 | this.context.lineCap = paras.lineCap||"round"; 185 | this.context.globalCompositeOperation = paras.globalCompositeOperation || "source-over"; 186 | this.textInput.value=""; 187 | $(this.textInput).css({ 188 | display:"none", 189 | font:this.context.font, 190 | color:this.context.fillStyle, 191 | "border-color":this.context.fillStyle 192 | }); 193 | }; 194 | 195 | var _addCanvasEvent = function(){ 196 | var widget = this; 197 | var painting = false; 198 | var startX,startY,endX,endY,lineWidth; 199 | var minX,minY,maxX=0,maxY= 0,maxRadius = -1; 200 | $(this.canvas).mousedown(function(e){ 201 | lineWidth = widget.context.lineWidth; 202 | painting = true; 203 | startX = e.offsetX; 204 | startY = e.offsetY; 205 | if(widget.paintType==widget.PaintType.Pencil|| 206 | widget.paintType==widget.PaintType.Eraser){ 207 | widget.context.beginPath(); 208 | }else if(widget.paintType==widget.PaintType.Text){ 209 | painting = false; 210 | if(widget.textInput.value.trim()!=""){ 211 | widget.context.fillText(widget.textInput.value.trim(),widget.textX-7,widget.textY+8); 212 | widget.textInput.value=""; 213 | $(widget.textInput).hide(); 214 | }else{ 215 | $(widget.textInput).css({ 216 | display:"block", 217 | left:startX-10+"px", 218 | top:startY-15+"px" 219 | }); 220 | widget.textX = startX; 221 | widget.textY = startY; 222 | } 223 | }else if(widget.paintType==widget.PaintType.Rect){ 224 | minX = startX; 225 | minY = startY; 226 | maxX = startX; 227 | maxY = startY; 228 | }else if(widget.paintType==widget.PaintType.Circle){ 229 | maxRadius = -1; 230 | } 231 | }); 232 | $(this.canvas).mousemove(function(e){ 233 | if(painting){ 234 | endX = e.offsetX; 235 | endY = e.offsetY; 236 | if(widget.paintType==widget.PaintType.Pencil || widget.paintType==widget.PaintType.Eraser) { 237 | widget.context.moveTo(startX, startY); 238 | widget.context.lineTo(endX, endY); 239 | startX = endX; 240 | startY = endY; 241 | widget.context.stroke(); 242 | }else if(widget.paintType==widget.PaintType.Rect){ 243 | if(endX > maxX){maxX = endX;} 244 | if(endX < minX){minX = endX;} 245 | if(endY > maxY){maxY = endY;} 246 | if(endY < minY){minY = endY;} 247 | widget.context.clearRect(minX-lineWidth,minY-lineWidth,maxX - minX+2*lineWidth,maxY - minY+2*lineWidth); 248 | widget.context.strokeRect(startX,startY,e.offsetX -startX,e.offsetY - startY); 249 | }else if(widget.paintType==widget.PaintType.Circle){ 250 | var radius = Math.sqrt(Math.pow(e.offsetX -startX,2),Math.pow(e.offsetY - startY,2)); 251 | if(maxRadius < radius){maxRadius = radius;} 252 | widget.context.clearRect(startX-maxRadius-lineWidth,startY-maxRadius-lineWidth,2*maxRadius+2*lineWidth,2*maxRadius+2*lineWidth); 253 | widget.context.beginPath(); 254 | widget.context.arc(startX,startY,radius,0,2*Math.PI); 255 | widget.context.stroke(); 256 | widget.context.closePath(); 257 | } 258 | } 259 | }); 260 | $(this.canvas).mouseup(function(e){ 261 | painting = false; 262 | widget.context.closePath(); 263 | }); 264 | }; 265 | var _insertSnapContainerDownLoad=function(){ 266 | this.snapContainerDownLoad = $('

'+ 267 | '

使用截屏功能需要安装插件,是否下载？

' 268 | +'

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