{"id":186041,"date":"2023-06-07T20:16:44","date_gmt":"2023-06-07T12:16:44","guid":{"rendered":"http:\/\/www.idc.net\/help\/186041\/"},"modified":"2023-06-07T20:16:44","modified_gmt":"2023-06-07T12:16:44","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91%e7%99%be%e5%ba%a6%e5%b0%8f%e7%a8%8b%e5%ba%8f%e6%95%99%e7%a8%8b%ef%bc%9acanvascontext","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/186041\/","title":{"rendered":"\u540e\u6d6a\u4e91\u767e\u5ea6\u5c0f\u7a0b\u5e8f\u6559\u7a0b\uff1aCanvasContext"},"content":{"rendered":"<ul>\n<li>CanvasContext\n<ul>\n<li>\u65b9\u6cd5\u53c2\u6570<\/li>\n<li>\u793a\u4f8b\n<ul>\n<li>\u56fe\u7247\u793a\u4f8b<\/li>\n<li>\u4ee3\u7801\u793a\u4f8b\n<ul><\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><span><\/span>CanvasContext<\/h1>\n<p><strong>\u89e3\u91ca<\/strong>\uff1a \u7ed8\u56fe\u4e0a\u4e0b\u6587\u3002<\/p>\n<h2><span><\/span>\u65b9\u6cd5\u53c2\u6570<\/h2>\n<p>\u65e0<\/p>\n<h2><span><\/span>\u793a\u4f8b<\/h2>\n<p>\u8df3\u8f6c\u7f16\u8f91\u5de5\u5177<\/p>\n<p>\u5728\u5f00\u53d1\u8005\u5de5\u5177\u4e2d\u6253\u5f00<\/p>\n<p>\u5728 WEB IDE \u4e2d\u6253\u5f00<\/p>\n<p>\u626b\u7801\u4f53\u9a8c<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/static.sitestack.cn\/projects\/smartprogram-20210306\/97ebf63311ffac886baad1c970c1b97b.png\" class=\"aligncenter\"><\/p>\n<p>\u8bf7\u4f7f\u7528\u767e\u5ea6APP\u626b\u7801<\/p>\n<h3><span><\/span>\u56fe\u7247\u793a\u4f8b<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/static.sitestack.cn\/projects\/smartprogram-20210306\/8ae1db5648af1e15f87af8cf6459ea79.gif\" class=\"aligncenter\"><\/p>\n<\/p>\n<h3><span><\/span>\u4ee3\u7801\u793a\u4f8b<\/h3>\n<ul>\n<li>SWAN<\/li>\n<li>JS<\/li>\n<li>CSS<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>&lt;view<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"wrap\"<\/span><span>&gt;<\/span><span> <\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"card-area\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;canvas<\/span><span> <\/span><span>canvas-id<\/span><span>=<\/span><span>\"canvas\"<\/span><span>&gt;&lt;\/canvas&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"card-area flexBottom swan-security-padding-bottom\"<\/span><span> <\/span><span>style<\/span><span>=<\/span><span>\"<\/span><span>height<\/span><span>:{{<\/span><span>isIPhoneX <\/span><span>?<\/span><span> <\/span><span>5.4<\/span><span> <\/span><span>:<\/span><span> <\/span><span>4.1<\/span><span>}}<\/span><span>rem<\/span><span>\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"top-description border-bottom\"<\/span><span>&gt;<\/span><span>\u5c55\u793a\u7ed8\u56fe<\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;scroll-view<\/span><span> <\/span><span>scroll-y<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"scroll\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;button<\/span><span> <\/span><span>s-for<\/span><span>=<\/span><span>\"item in methods\"<\/span><span> <\/span><span>class<\/span><span>=<\/span><span>\"canvas-button\"<\/span><span> <\/span><span>type<\/span><span>=<\/span><span>\"primary\"<\/span><span> <\/span><span>bindtap<\/span><span>=<\/span><span>\"{{item}}\"<\/span><span>&gt;<\/span><span>{{item}}<\/span><span>&lt;\/button&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;button<\/span><span> <\/span><span>bindtap<\/span><span>=<\/span><span>\"toTempFilePath\"<\/span><span> <\/span><span>type<\/span><span>=<\/span><span>\"primary\"<\/span><span>&gt;<\/span><span>toTempFilePath<\/span><span>&lt;\/button&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/scroll-view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;\/view&gt;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<ul>\n<li>\n<p>\u5728 canvas \u6587\u4ef6\u4e2d<\/p>\n<\/li>\n<li>\n<p>JS<\/p>\n<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>const<\/span><span> canvas <\/span><span>=<\/span><span> <\/span><span>{};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>arc <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>arc<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>2<\/span><span> <\/span><span>*<\/span><span> <\/span><span>Math<\/span><span>.<\/span><span>PI<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fill<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>draw<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>beginPath <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>5<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'#ff0000'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>250<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'#0000ff'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>50<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>150<\/span><span>,<\/span><span> <\/span><span>130<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>bezierCurveTo <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>bezierCurveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'black'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>clearRect <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>250<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>clearRect<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>draw<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>clip <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>50<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>120<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>clip<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>closePath <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>70<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>closePath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>createCircularGradient <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>\/\/ Create circular gradient<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>const<\/span><span> grd <\/span><span>=<\/span><span> context<\/span><span>.<\/span><span>createCircularGradient<\/span><span>(<\/span><span>75<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>\/\/ Fill with gradient<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>grd<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>80<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>createLinearGradient <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>const<\/span><span> grd <\/span><span>=<\/span><span> context<\/span><span>.<\/span><span>createLinearGradient<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>\/\/ Fill with gradient<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>grd<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>80<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>drawImage <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>drawImage<\/span><span>(<\/span><span>'https:\/\/b.bdstatic.com\/searchbox\/icms\/searchbox\/img\/api_logo.png'<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>fill <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fill<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>fillRect <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>fillText <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'Hello'<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'World'<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>font <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>font <\/span><span>=<\/span><span> <\/span><span>'50px oblique bold Microsoft YaiHei'<\/span><span>;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'\u5fae\u8f6f\u96c5\u9ed1'<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>font <\/span><span>=<\/span><span> <\/span><span>'50px \u6977\u4f53'<\/span><span>;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'\u6977\u4f53'<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>lineTo <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>110<\/span><span>,<\/span><span> <\/span><span>60<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>moveTo <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>quadraticCurveTo <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>quadraticCurveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>rect <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>rotate <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rotate<\/span><span>(<\/span><span>10<\/span><span> <\/span><span>*<\/span><span> <\/span><span>Math<\/span><span>.<\/span><span>PI <\/span><span>\/<\/span><span> <\/span><span>180<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rotate<\/span><span>(<\/span><span>10<\/span><span> <\/span><span>*<\/span><span> <\/span><span>Math<\/span><span>.<\/span><span>PI <\/span><span>\/<\/span><span> <\/span><span>180<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fill<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>saveAndRestore <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>save<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>restore<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>50<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>scale <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>25<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>scale<\/span><span>(<\/span><span>2<\/span><span>,<\/span><span> <\/span><span>2<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>25<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>scale<\/span><span>(<\/span><span>2<\/span><span>,<\/span><span> <\/span><span>2<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>25<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setFillStyle <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>[<\/span><span>'blue'<\/span><span>,<\/span><span> <\/span><span>'#ffff00'<\/span><span>,<\/span><span> <\/span><span>'rgba(255,255,0, 0.3)'<\/span><span>].<\/span><span>forEach<\/span><span>(<\/span><span>function<\/span><span> <\/span><span>(<\/span><span>item<\/span><span>,<\/span><span> index<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>item<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>0<\/span><span> <\/span><span>+<\/span><span> <\/span><span>75<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fill<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>});<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setFontSize <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'20'<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>30<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'30'<\/span><span>,<\/span><span> <\/span><span>40<\/span><span>,<\/span><span> <\/span><span>40<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>40<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'40'<\/span><span>,<\/span><span> <\/span><span>60<\/span><span>,<\/span><span> <\/span><span>60<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'50'<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setGlobalAlpha <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setGlobalAlpha<\/span><span>(<\/span><span>0.2<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>50<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'yellow'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>draw<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setLineCap <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>200<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>[<\/span><span>'butt'<\/span><span>,<\/span><span> <\/span><span>'round'<\/span><span>,<\/span><span> <\/span><span>'square'<\/span><span>].<\/span><span>forEach<\/span><span>(<\/span><span>function<\/span><span> <\/span><span>(<\/span><span>item<\/span><span>,<\/span><span> index<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineCap<\/span><span>(<\/span><span>item<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>20<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>20<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>200<\/span><span>,<\/span><span> <\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>20<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>});<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setLineDash <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineDash<\/span><span>([<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>],<\/span><span> <\/span><span>5<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>400<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setLineJoin <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>90<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>[<\/span><span>'bevel'<\/span><span>,<\/span><span> <\/span><span>'round'<\/span><span>,<\/span><span> <\/span><span>'miter'<\/span><span>].<\/span><span>forEach<\/span><span>(<\/span><span>function<\/span><span> <\/span><span>(<\/span><span>item<\/span><span>,<\/span><span> index<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineJoin<\/span><span>(<\/span><span>item<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>30<\/span><span> <\/span><span>+<\/span><span> <\/span><span>80<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>120<\/span><span> <\/span><span>+<\/span><span> <\/span><span>80<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>30<\/span><span> <\/span><span>+<\/span><span> <\/span><span>80<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>});<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setLineWidth <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>[<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>5<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>].<\/span><span>forEach<\/span><span>(<\/span><span>function<\/span><span> <\/span><span>(<\/span><span>item<\/span><span>,<\/span><span> index<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>item<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>10<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>20<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>20<\/span><span> <\/span><span>+<\/span><span> <\/span><span>20<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>});<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setMiterLimit <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>[<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>2<\/span><span>,<\/span><span> <\/span><span>3<\/span><span>,<\/span><span> <\/span><span>4<\/span><span>].<\/span><span>forEach<\/span><span>(<\/span><span>function<\/span><span> <\/span><span>(<\/span><span>item<\/span><span>,<\/span><span> index<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setMiterLimit<\/span><span>(<\/span><span>item<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineJoin<\/span><span>(<\/span><span>'miter'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>50<\/span><span> <\/span><span>+<\/span><span> <\/span><span>40<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>140<\/span><span> <\/span><span>+<\/span><span> <\/span><span>40<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>50<\/span><span> <\/span><span>+<\/span><span> <\/span><span>40<\/span><span> <\/span><span>*<\/span><span> index<\/span><span>,<\/span><span> <\/span><span>90<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>});<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setShadow <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setShadow<\/span><span>(<\/span><span>15<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>,<\/span><span> <\/span><span>15<\/span><span>,<\/span><span> <\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>rect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fill<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setStrokeStyle <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setTextAlign <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>150<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>150<\/span><span>,<\/span><span> <\/span><span>170<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>15<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextAlign<\/span><span>(<\/span><span>'left'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'textAlign=left'<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>60<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextAlign<\/span><span>(<\/span><span>'center'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'textAlign=center'<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>80<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextAlign<\/span><span>(<\/span><span>'right'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'textAlign=right'<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setTextBaseline <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>5<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>295<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextBaseline<\/span><span>(<\/span><span>'top'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'top'<\/span><span>,<\/span><span> <\/span><span>5<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextBaseline<\/span><span>(<\/span><span>'middle'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'middle'<\/span><span>,<\/span><span> <\/span><span>50<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextBaseline<\/span><span>(<\/span><span>'bottom'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'bottom'<\/span><span>,<\/span><span> <\/span><span>120<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTextBaseline<\/span><span>(<\/span><span>'normal'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillText<\/span><span>(<\/span><span>'normal'<\/span><span>,<\/span><span> <\/span><span>200<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>setTransform <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTransform<\/span><span>(<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>0.5<\/span><span>,<\/span><span> <\/span><span>-<\/span><span>0.5<\/span><span>,<\/span><span> <\/span><span>1<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setTransform<\/span><span>(<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>0.5<\/span><span>,<\/span><span> <\/span><span>-<\/span><span>0.5<\/span><span>,<\/span><span> <\/span><span>1<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>stroke <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>moveTo<\/span><span>(<\/span><span>100<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>lineTo<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>stroke<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>strokeRect <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>75<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>translate <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>translate<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>translate<\/span><span>(<\/span><span>20<\/span><span>,<\/span><span> <\/span><span>20<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>strokeRect<\/span><span>(<\/span><span>10<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>100<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>addColorStop <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>const<\/span><span> grd <\/span><span>=<\/span><span> context<\/span><span>.<\/span><span>createLinearGradient<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>,<\/span><span> <\/span><span>120<\/span><span>,<\/span><span> <\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>'red'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0.16<\/span><span>,<\/span><span> <\/span><span>'orange'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0.33<\/span><span>,<\/span><span> <\/span><span>'yellow'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0.5<\/span><span>,<\/span><span> <\/span><span>'green'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0.66<\/span><span>,<\/span><span> <\/span><span>'cyan'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>0.83<\/span><span>,<\/span><span> <\/span><span>'blue'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> grd<\/span><span>.<\/span><span>addColorStop<\/span><span>(<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>'purple'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>grd<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>fillRect<\/span><span>(<\/span><span>30<\/span><span>,<\/span><span> <\/span><span>30<\/span><span>,<\/span><span> <\/span><span>150<\/span><span>,<\/span><span> <\/span><span>80<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>canvas<\/span><span>.<\/span><span>reset <\/span><span>=<\/span><span> <\/span><span>function<\/span><span> <\/span><span>(<\/span><span>context<\/span><span>)<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>beginPath<\/span><span>();<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFillStyle<\/span><span>(<\/span><span>'#000000'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setStrokeStyle<\/span><span>(<\/span><span>'#000000'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setFontSize<\/span><span>(<\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setShadow<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>0<\/span><span>,<\/span><span> <\/span><span>'rgba(0, 0, 0, 0)'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineCap<\/span><span>(<\/span><span>'butt'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineJoin<\/span><span>(<\/span><span>'miter'<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setLineWidth<\/span><span>(<\/span><span>1<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span> context<\/span><span>.<\/span><span>setMiterLimit<\/span><span>(<\/span><span>10<\/span><span>);<\/span><\/code><\/li>\n  \n  \n  <li><code><span>};<\/span><\/code><\/li>\n  \n  \n  <li><code><\/code><\/li>\n  \n  \n  <li><code><span>module<\/span><span>.<\/span><span>exports <\/span><span>=<\/span><span> canvas<\/span><span>;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>CanvasContext \u65b9\u6cd5\u53c2\u6570 \u793a\u4f8b \u56fe\u7247\u793a\u4f8b \u4ee3\u7801\u793a\u4f8b CanvasContext \u89e3\u91ca\uff1a \u7ed8\u56fe\u4e0a\u4e0b\u6587 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":186042,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182398],"tags":[],"class_list":["post-186041","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mini-program"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/186041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=186041"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/186041\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/186042"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=186041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=186041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=186041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}