{"id":29427,"date":"2024-11-25T13:11:18","date_gmt":"2024-11-25T05:11:18","guid":{"rendered":"https:\/\/fwq.ai\/blog\/29427\/"},"modified":"2024-11-25T13:11:18","modified_gmt":"2024-11-25T05:11:18","slug":"%e5%be%ae%e4%bf%a1%e5%b0%8f%e7%a8%8b%e5%ba%8fdemo%e6%8e%a8%e8%8d%90%ef%bc%9a%e5%be%ae%e4%bf%a1%e6%b6%82%e9%b8%a6%e3%80%81canvas%e5%ad%a6%e4%b9%a0%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/29427\/","title":{"rendered":"\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b"},"content":{"rendered":"<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\">\u8fd9\u4e2ademo\uff0c\u5e94\u8be5\u662f\u4f5c\u8005\u7684\u7ec3\u4e60demo\uff0c\u8868\u9762\u4e0a\u5e76\u6ca1\u6709\u5c55\u793a\u5b8c\u5168\uff1b<\/span><\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\">\u7ed3\u6784\u56fe\uff1a<\/span><\/p>\n<p style=\"padding:0px;margin-top:0px;text-align:center;margin-bottom:0px\"><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/013\/35f5000e2fd9680b9f5943c69c6f141e-0.png\" style=\"max-width:90%\" class=\"aligncenter\" title=\"\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b\u63d2\u56fe\" alt=\"\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b\u63d2\u56fe\" \/><\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\">\u5176\u4e2d\u5fae\u4fe1\u6d82\u9e26\u90e8\u5206\u9884\u89c8\u56fe\uff1a<\/span><\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;text-align:center;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\"><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/013\/35f5000e2fd9680b9f5943c69c6f141e-1.gif\" style=\"max-width:90%\" class=\"aligncenter\" title=\"\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b\u63d2\u56fe1\" alt=\"\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b\u63d2\u56fe1\" \/><br \/><\/span><\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\">\u5176\u4e2d\u5fae\u4fe1\u6d82\u9e26\u90e8\u5206\u9884\u89c8\u56fe\uff1a<\/span><\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/span><\/p>\n<pre>Page({\r\n&nbsp;&nbsp;data:{\r\n&nbsp;&nbsp;&nbsp;&nbsp;pen&nbsp;:&nbsp;3,&nbsp;\/\/\u753b\u7b14\u7c97\u7ec6\u9ed8\u8ba4\u503c\r\n&nbsp;&nbsp;&nbsp;&nbsp;color&nbsp;:&nbsp;'#cc0033'&nbsp;\/\/\u753b\u7b14\u989c\u8272\u9ed8\u8ba4\u503c\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;startX:&nbsp;0,&nbsp;\/\/\u4fdd\u5b58X\u5750\u6807\u8f74\u53d8\u91cf\r\n&nbsp;&nbsp;startY:&nbsp;0,&nbsp;\/\/\u4fdd\u5b58Y\u5750\u6807\u8f74\u53d8\u91cf\r\n&nbsp;&nbsp;isClear&nbsp;:&nbsp;false,&nbsp;\/\/\u662f\u5426\u542f\u7528\u6a61\u76ae\u64e6\u6807\u8bb0\r\n&nbsp;&nbsp;\/\/\u624b\u6307\u89e6\u6478\u52a8\u4f5c\u5f00\u59cb\r\n&nbsp;&nbsp;touchStart:&nbsp;function&nbsp;(e)&nbsp;{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/\u5f97\u5230\u89e6\u6478\u70b9\u7684\u5750\u6807\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startX&nbsp;=&nbsp;e.changedTouches[0].x\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startY&nbsp;=&nbsp;e.changedTouches[0].y\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context&nbsp;=&nbsp;wx.createContext()\r\n&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(this.isClear){&nbsp;\/\/\u5224\u65ad\u662f\u5426\u542f\u7528\u7684\u6a61\u76ae\u64e6\u529f\u80fd&nbsp;&nbsp;ture\u8868\u793a\u6e05\u9664&nbsp;&nbsp;false\u8868\u793a\u753b\u753b\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setStrokeStyle('#FFFFFF')&nbsp;\/\/\u8bbe\u7f6e\u7ebf\u6761\u6837\u5f0f&nbsp;\u6b64\u5904\u8bbe\u7f6e\u4e3a\u753b\u5e03\u7684\u80cc\u666f\u989c\u8272&nbsp;&nbsp;\u6a61\u76ae\u64e6\u539f\u7406\u5c31\u662f\uff1a\u5229\u7528\u64e6\u8fc7\u7684\u5730\u65b9\u88ab\u586b\u5145\u4e3a\u753b\u5e03\u7684\u80cc\u666f\u989c\u8272\u4e00\u81f4&nbsp;\u4ece\u800c\u8fbe\u5230\u6a61\u76ae\u64e6\u7684\u6548\u679c&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineCap('round')&nbsp;\/\/\u8bbe\u7f6e\u7ebf\u6761\u7aef\u70b9\u7684\u6837\u5f0f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineJoin('round')&nbsp;\/\/\u8bbe\u7f6e\u4e24\u7ebf\u76f8\u4ea4\u5904\u7684\u6837\u5f0f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineWidth(20)&nbsp;\/\/\u8bbe\u7f6e\u7ebf\u6761\u5bbd\u5ea6\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.save();&nbsp;&nbsp;\/\/\u4fdd\u5b58\u5f53\u524d\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.beginPath()&nbsp;\/\/\u5f00\u59cb\u4e00\u4e2a\u8def\u5f84&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.arc(this.startX,this.startY,5,0,2*Math.PI,true);&nbsp;&nbsp;\/\/\u6dfb\u52a0\u4e00\u4e2a\u5f27\u5f62\u8def\u5f84\u5230\u5f53\u524d\u8def\u5f84\uff0c\u987a\u65f6\u9488\u7ed8\u5236&nbsp;&nbsp;\u8fd9\u91cc\u603b\u5171\u753b\u4e86360\u5ea6&nbsp;&nbsp;\u4e5f\u5c31\u662f\u4e00\u4e2a\u5706\u5f62&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.fill();&nbsp;&nbsp;\/\/\u5bf9\u5f53\u524d\u8def\u5f84\u8fdb\u884c\u586b\u5145\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.restore();&nbsp;&nbsp;\/\/\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u8fc7\u7684\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}else{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setStrokeStyle(this.data.color)\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineWidth(this.data.pen)\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineCap('round')&nbsp;\/\/&nbsp;\u8ba9\u7ebf\u6761\u5706\u6da6&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.beginPath()\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;\/\/\u624b\u6307\u89e6\u6478\u540e\u79fb\u52a8\r\n&nbsp;&nbsp;touchMove:&nbsp;function&nbsp;(e)&nbsp;{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;startX1&nbsp;=&nbsp;e.changedTouches[0].x\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;startY1&nbsp;=&nbsp;e.changedTouches[0].y\r\n&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(this.isClear){&nbsp;\/\/\u5224\u65ad\u662f\u5426\u542f\u7528\u7684\u6a61\u76ae\u64e6\u529f\u80fd&nbsp;&nbsp;ture\u8868\u793a\u6e05\u9664&nbsp;&nbsp;false\u8868\u793a\u753b\u753b\r\n&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.save();&nbsp;&nbsp;\/\/\u4fdd\u5b58\u5f53\u524d\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.moveTo(this.startX,this.startY);&nbsp;&nbsp;\/\/\u628a\u8def\u5f84\u79fb\u52a8\u5230\u753b\u5e03\u4e2d\u7684\u6307\u5b9a\u70b9\uff0c\u4f46\u4e0d\u521b\u5efa\u7ebf\u6761\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.lineTo(startX1,startY1);&nbsp;&nbsp;\/\/\u6dfb\u52a0\u4e00\u4e2a\u65b0\u70b9\uff0c\u7136\u540e\u5728\u753b\u5e03\u4e2d\u521b\u5efa\u4ece\u8be5\u70b9\u5230\u6700\u540e\u6307\u5b9a\u70b9\u7684\u7ebf\u6761\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.stroke();&nbsp;&nbsp;\/\/\u5bf9\u5f53\u524d\u8def\u5f84\u8fdb\u884c\u63cf\u8fb9\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.restore()&nbsp;&nbsp;\/\/\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u8fc7\u7684\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startX&nbsp;=&nbsp;startX1;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startY&nbsp;=&nbsp;startY1;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}else{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.moveTo(this.startX,&nbsp;this.startY)\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.lineTo(startX1,&nbsp;startY1)\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.stroke()\r\n&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startX&nbsp;=&nbsp;startX1;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startY&nbsp;=&nbsp;startY1;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/\u53ea\u662f\u4e00\u4e2a\u8bb0\u5f55\u65b9\u6cd5\u8c03\u7528\u7684\u5bb9\u5668\uff0c\u7528\u4e8e\u751f\u6210\u8bb0\u5f55\u7ed8\u5236\u884c\u4e3a\u7684actions\u6570\u7ec4\u3002context\u8ddf\u4e0d\u5b58\u5728\u5bf9\u5e94\u5173\u7cfb\uff0c\u4e00\u4e2acontext\u751f\u6210\u753b\u5e03\u7684\u7ed8\u5236\u52a8\u4f5c\u6570\u7ec4\u53ef\u4ee5\u5e94\u7528\u4e8e\u591a\u4e2a\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;wx.drawCanvas({\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;canvasId:&nbsp;'myCanvas',\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reserve:&nbsp;true,\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;actions:&nbsp;this.context.getActions()&nbsp;\/\/&nbsp;\u83b7\u53d6\u7ed8\u56fe\u52a8\u4f5c\u6570\u7ec4\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;})\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;\/\/\u624b\u6307\u89e6\u6478\u52a8\u4f5c\u7ed3\u675f\r\n&nbsp;&nbsp;touchEnd:&nbsp;function&nbsp;()&nbsp;{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;\/\/\u542f\u52a8\u6a61\u76ae\u64e6\u65b9\u6cd5\r\n&nbsp;&nbsp;clearCanvas:&nbsp;function(){\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(this.isClear){\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.isClear&nbsp;=&nbsp;false;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}else{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.isClear&nbsp;=&nbsp;true;\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;penSelect:&nbsp;function(e){&nbsp;\/\/\u66f4\u6539\u753b\u7b14\u5927\u5c0f\u7684\u65b9\u6cd5\r\n&nbsp;&nbsp;&nbsp;&nbsp;console.log(e.currentTarget);\r\n&nbsp;&nbsp;&nbsp;&nbsp;this.setData({pen:parseInt(e.currentTarget.dataset.param)});\r\n&nbsp;&nbsp;&nbsp;&nbsp;this.isClear&nbsp;=&nbsp;false;\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;colorSelect:&nbsp;function(e){&nbsp;\/\/\u66f4\u6539\u753b\u7b14\u989c\u8272\u7684\u65b9\u6cd5\r\n&nbsp;&nbsp;&nbsp;&nbsp;console.log(e.currentTarget);\r\n&nbsp;&nbsp;&nbsp;&nbsp;this.setData({color:e.currentTarget.dataset.param});\r\n&nbsp;&nbsp;&nbsp;&nbsp;this.isClear&nbsp;=&nbsp;false;\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;\/\/&nbsp;\u4e0b\u62c9\u5237\u65b0\r\n&nbsp;&nbsp;onPullDownRefresh:&nbsp;function(){\r\n&nbsp;&nbsp;&nbsp;&nbsp;wx.stopPullDownRefresh()\r\n&nbsp;&nbsp;},\r\n&nbsp;&nbsp;\/\/&nbsp;\u9875\u9762\u5206\u4eab\r\n&nbsp;&nbsp;onShareAppMessage:&nbsp;function&nbsp;()&nbsp;{\r\n&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;{\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;title:&nbsp;'\u5fae\u4fe1\u5c0f\u7a0b\u5e8f',\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;desc:&nbsp;'\u8fd9\u662f\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u7684\u5206\u4eab\u529f\u80fd',\r\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;path:&nbsp;'\/page\/canvas'\r\n&nbsp;&nbsp;&nbsp;&nbsp;}\r\n&nbsp;&nbsp;}\r\n})<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p style=\"padding:0px;margin-top:0px;line-height:2em;margin-bottom:0px\"><span style=\"font-family:\u5fae\u8f6f\u96c5\u9ed1,\"><\/span><\/p>\n<p style=\"text-align: center\"><\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5fae\u4fe1\u5c0f\u7a0b\u5e8fdemo\u63a8\u8350\uff1a\u5fae\u4fe1\u6d82\u9e26\u3001canvas\u5b66\u4e60\u5b9e\u4f8b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e2ademo\uff0c\u5e94\u8be5\u662f\u4f5c\u8005\u7684\u7ec3\u4e60demo\uff0c\u8868\u9762\u4e0a\u5e76\u6ca1\u6709\u5c55\u793a\u5b8c\u5168\uff1b \u7ed3\u6784\u56fe\uff1a \u5176\u4e2d\u5fae\u4fe1\u6d82\u9e26\u90e8\u5206\u9884\u89c8\u56fe\uff1a \u5176\u4e2d\u5fae\u4fe1\u6d82\u9e26\u90e8\u5206\u9884\u89c8\u56fe\uff1a \u793a\u4f8b\u4ee3\u7801\uff1a Page({ &nbsp;&nbsp;data:{ &nbsp;&nbsp;&nbsp;&nbsp;pen&nbsp;:&nbsp;3,&nbsp;\/\/\u753b\u7b14\u7c97\u7ec6\u9ed8\u8ba4\u503c &nbsp;&nbsp;&nbsp;&nbsp;color&nbsp;:&nbsp;&#8216;#cc0033&#8217;&nbsp;\/\/\u753b\u7b14\u989c\u8272\u9ed8\u8ba4\u503c &nbsp;&nbsp;}, &nbsp;&nbsp;startX:&nbsp;0,&nbsp;\/\/\u4fdd\u5b58X\u5750\u6807\u8f74\u53d8\u91cf &nbsp;&nbsp;startY:&nbsp;0,&nbsp;\/\/\u4fdd\u5b58Y\u5750\u6807\u8f74\u53d8\u91cf &nbsp;&nbsp;isClear&nbsp;:&nbsp;false,&nbsp;\/\/\u662f\u5426\u542f\u7528\u6a61\u76ae\u64e6\u6807\u8bb0 &nbsp;&nbsp;\/\/\u624b\u6307\u89e6\u6478\u52a8\u4f5c\u5f00\u59cb &nbsp;&nbsp;touchStart:&nbsp;function&nbsp;(e)&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/\u5f97\u5230\u89e6\u6478\u70b9\u7684\u5750\u6807 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startX&nbsp;=&nbsp;e.changedTouches[0].x &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startY&nbsp;=&nbsp;e.changedTouches[0].y &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context&nbsp;=&nbsp;wx.createContext() &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(this.isClear){&nbsp;\/\/\u5224\u65ad\u662f\u5426\u542f\u7528\u7684\u6a61\u76ae\u64e6\u529f\u80fd&nbsp;&nbsp;ture\u8868\u793a\u6e05\u9664&nbsp;&nbsp;false\u8868\u793a\u753b\u753b &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setStrokeStyle(&#8216;#FFFFFF&#8217;)&nbsp;\/\/\u8bbe\u7f6e\u7ebf\u6761\u6837\u5f0f&nbsp;\u6b64\u5904\u8bbe\u7f6e\u4e3a\u753b\u5e03\u7684\u80cc\u666f\u989c\u8272&nbsp;&nbsp;\u6a61\u76ae\u64e6\u539f\u7406\u5c31\u662f\uff1a\u5229\u7528\u64e6\u8fc7\u7684\u5730\u65b9\u88ab\u586b\u5145\u4e3a\u753b\u5e03\u7684\u80cc\u666f\u989c\u8272\u4e00\u81f4&nbsp;\u4ece\u800c\u8fbe\u5230\u6a61\u76ae\u64e6\u7684\u6548\u679c&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineCap(&#8217;round&#8217;)&nbsp;\/\/\u8bbe\u7f6e\u7ebf\u6761\u7aef\u70b9\u7684\u6837\u5f0f 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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.fill();&nbsp;&nbsp;\/\/\u5bf9\u5f53\u524d\u8def\u5f84\u8fdb\u884c\u586b\u5145 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.restore();&nbsp;&nbsp;\/\/\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u8fc7\u7684\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setStrokeStyle(this.data.color) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineWidth(this.data.pen) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.setLineCap(&#8217;round&#8217;)&nbsp;\/\/&nbsp;\u8ba9\u7ebf\u6761\u5706\u6da6&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.beginPath() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;}, 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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.lineTo(startX1,startY1);&nbsp;&nbsp;\/\/\u6dfb\u52a0\u4e00\u4e2a\u65b0\u70b9\uff0c\u7136\u540e\u5728\u753b\u5e03\u4e2d\u521b\u5efa\u4ece\u8be5\u70b9\u5230\u6700\u540e\u6307\u5b9a\u70b9\u7684\u7ebf\u6761 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.stroke();&nbsp;&nbsp;\/\/\u5bf9\u5f53\u524d\u8def\u5f84\u8fdb\u884c\u63cf\u8fb9 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.context.restore()&nbsp;&nbsp;\/\/\u6062\u590d\u4e4b\u524d\u4fdd\u5b58\u8fc7\u7684\u5750\u6807\u8f74\u7684\u7f29\u653e\u3001\u65cb\u8f6c\u3001\u5e73\u79fb\u4fe1\u606f &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startX&nbsp;=&nbsp;startX1; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;this.startY&nbsp;=&nbsp;startY1; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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