一、getContext()方法 翻译自：https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext...语法：canvas.getContext(contextType, contextAttributes); var ctx = canvas.getContext（contextType）; var...contextAttributes参数可传递多个参数集合用来创建渲染上下文： 例如：canvas.getContext('webgl', { antialias: false, depth: false...('myCanvas'); var gl = canvas.getContext('webgl'); 获得画布的WebGL渲染上下文后，可以在其中进行渲染。...; var gl = canvas.getContext('webgl2'); WebGL 2是WebGL 1的扩展。
在学习webgl的时候，看到别人的example里面有这样的代码： canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl...var gl = c.getContext('webgl') || c.getContext('experimental-webgl'); 如果浏览器支持webgl的话，这个时候gl就是你获取到的WebGL...关于getContext方法的用法参见笔者博客https://blog.csdn.net/acoolgiser/article/details/85800799
错误提示 Uncaught TypeError: Cannot read properties of null (reading 'getContext') 2. 错误截图 3.
cancelStopUntil(); void setContext(PumaContext context); void initContext(); PumaContext getContext...InstanceTask getInstanceTask(); TableSet getTableSet(); } TaskExecutor继承了LifeCycle，定义了initContext、getContext...()); getContext().setBinlogStartPos(4); getContext().setMasterUrl(currentSrcDbEntity.getHost...()); try { getContext().setNextBinlogPos...().setBinlogFileName(rotateEvent.getNextBinlogFileName()); getContext
cancelStopUntil(); void setContext(PumaContext context); void initContext(); PumaContext getContext...InstanceTask getInstanceTask(); TableSet getTableSet(); } TaskExecutor继承了LifeCycle，定义了initContext、getContext...()); getContext().setBinlogStartPos(4); getContext().setMasterUrl(currentSrcDbEntity.getHost...()); try { getContext().setNextBinlogPos...().setBinlogFileName(rotateEvent.getNextBinlogFileName()); getContext
> invoker, Invocation invocation) throws RpcException { RpcContext.getContext()...().getInvoker()); assertEquals(invocation, RpcContext.getContext().getInvocation());...assertEquals(NetUtils.getLocalHost() + ":0", RpcContext.getContext().getLocalAddressString());...assertEquals("test:11", RpcContext.getContext().getRemoteAddressString()); return result;...}); } } 这里使用asyncResult.thenApplyWithContext来验证一下RpcContext.getContext()的invoker、invocation
haha 可以通过if(canvas.getContext)来判断浏览器是否支持canvas...通过canvas.getContext('2d')可以获取 2D 绘图上下文。2D 绘图上下文提供了绘制 2D 图形的方法。...const mycanvas = document.getElementById("mycanvas"); // 确保浏览器支持canvas if (mycanvas.getContext) {...const context = mycanvas.getContext("2d"); context.fillStyle = "#000"; context.strokeStyle = "red...const mycanvas = document.getElementById("mycanvas"); // 确保浏览器支持canvas if (mycanvas.getContext) {
@Override public Slice onBindSlice(Uri sliceUri) { if (getContext() == null) { return null...SliceAction activityAction = createActivityAction(); return new ListBuilder(getContext(), sliceUri...public Slice createBrightnessSlice(Uri sliceUri) { if (getContext() == null) { return null...(), MyBroadcastReceiver.class); return PendingIntent.getBroadcast(getContext(), 0, intent, 0); }...public Slice createDynamicSlice(Uri sliceUri) { if (getContext() == null || sliceUri.getPath() ==
横的分界线 * * @return */ private View getWeekTransverseLine() { TextView mWeekline = new TextView(getContext...* 竖向分界线 * * @return */ private View getWeekVerticalLine() { TextView mWeekline = new TextView(getContext...; } 下面就看其它的View 那就从上到下开始先看星期的布局 private void initView() { mHorizontalWeekLayout = new LinearLayout(getContext...()); mHorizontalWeekLayout.setOrientation(HORIZONTAL); mVerticalWeekLaout = new LinearLayout(getContext...()); mTimeTableView.setOrientation(VERTICAL); TextView mTimeTableNameView = new TextView(getContext()
stationTextPaint, currentStationTextPaint, doorTextPaint; private float barHeight = DensityUtil.dp2Px(getContext...height / 2; //计算中间空白圆形宽度 if (0 == centerRingWidth) { centerRingWidth = (height - DensityUtil.dp2Px(getContext...} //计算中间圆的半径 if (0 == centerCircleWidth) { centerCircleWidth = centerRingWidth - DensityUtil.dp2Px(getContext...(), 10); float centerLineB = height - barHeight - DensityUtil.dp2Px(getContext(), 10); canvas.drawRect...(), 20); float stationWidth = DensityUtil.dp2Px(getContext(), 40); float stationPadding = DensityUtil.dp2Px
要在canvas上画图，需要取得canvas的上下文，通过getContext方法来获取上下文。 ...var context=canvas.getContext("2d"); 在使用getContext方法之前，需要判断浏览器是否支持该方法。 ...1 var canvas=document.getElementById("mycanvas"); 2 if(canvas.getContext){ 3 var...1 var canvas=document.getElementById("mycanvas"); 2 if(canvas.getContext){ 3 var...1 var canvas=document.getElementById("mycanvas"); 2 if(canvas.getContext){ 3 var
protected AnnotationConfigApplicationContext getContext(String name) { return super.getContext...(name); } //...... } SpringClientFactory的getContext方法调用了父类NamedContextFactory的getContext NamedContextFactory...protected AnnotationConfigApplicationContext getContext(String name) { if (!...(clientName)操作 SpringClientFactory的getContext方法调用了父类NamedContextFactory的getContext；NamedContextFactory...的getContext主要是返回或者创建AnnotationConfigApplicationContext doc RibbonClientConfiguration
){//判断浏览器是否支持getContext属性 var ctx = canvas.getContext('2d'); ctx.fillRect(0,0,150,150...){//判断浏览器是否支持getContext属性 var ctx = canvas.getContext('2d'); for(var i=0;i<3...){//判断浏览器是否支持getContext属性 var ctx = canvas.getContext('2d'); ctx.translate(75,75...){//判断浏览器是否支持getContext属性 var ctx = canvas.getContext('2d'); ctx.save();...){//判断浏览器是否支持getContext属性 var ctx = canvas.getContext('2d'); var sin = Math.sin
//获得 2d 上下文对象 var ctx = canvas.getContext (‘2d’); 检测支持性 if(canvas.getContext){ var ctx = canvas.getContext...canvas.getContext) return; var ctx =canvas.getContext("2d"); //开始代码draw(); } draw(); ...canvas.getContext) return; var ctx =canvas.getContext("2d"); //开始代码draw(); ctx.beginPath();//新建一条...canvas.getContext) return; var ctx =canvas.getContext("2d"); //开始代码draw(); ctx.beginPath();...canvas.getContext) return; var ctx =canvas.getContext("2d"); //开始代码draw(); ctx.beginPath();
delete/${file.id}">Delete 方法三、 还是查询用户 Authentication auth = SecurityContextHolder.getContext...= null && SecurityContextHolder.getContext().getAuthentication().isAuthenticated() && //when Anonymous...(SecurityContextHolder.getContext().getAuthentication() instanceof AnonymousAuthenticationToken...) if (SecurityContextHolder.getContext().getAuthentication().isAuthenticated()) { System.out.println...SecurityContextHolder.getContext().getAuthentication().getName().
().getText(id)); } public CustomToolBar setLeftText(CharSequence text) { Context context = this.getContext...().getText(Rid)); } public void setMyCenterTitle(CharSequence text) { Context context = this.getContext...(), resId)); } public void setMyCenterIcon(Drawable drawable) { Context context = this.getContext();...().getText(Rid)); } public void setMySettingText(CharSequence text) { Context context = this.getContext...) public CustomToolBar setMySettingIcon(Drawable drawable) { Context context = this.getContext(); if
protected AnnotationConfigApplicationContext getContext(String name) { return super.getContext(name);...} //...... } SpringClientFactory的getContext方法调用了父类NamedContextFactory的getContext NamedContextFactory...protected AnnotationConfigApplicationContext getContext(String name) { if (!...(clientName)操作 SpringClientFactory的getContext方法调用了父类NamedContextFactory的getContext；NamedContextFactory...的getContext主要是返回或者创建AnnotationConfigApplicationContext doc RibbonClientConfiguration
--------------- // 远程调用 xxxService.xxx(); // 本端是否为消费端，这里会返回true boolean isConsumerSide = RpcContext.getContext...().isConsumerSide(); // 获取最后一次调用的提供方IP地址 String serverIP = RpcContext.getContext().getRemoteHost(); /.../ 获取当前服务配置信息，所有配置信息都将转换为URL的参数 String application = RpcContext.getContext().getUrl().getParameter("application...().isProviderSide(); // 获取调用方IP地址 String clientIP = RpcContext.getContext().getRemoteHost...(); // 获取当前服务配置信息，所有配置信息都将转换为URL的参数 String application = RpcContext.getContext().getUrl
canvas.getContext) return; 16 var ctx = canvas.getContext("2d"); 17 //开始代码 18 19...canvas.getContext) return; var ctx = canvas.getContext("2d"); ctx.fillStyle = "rgb(200,0,0...canvas.getContext) return; 4 var ctx = canvas.getContext("2d"); 5 ctx.fillRect(10, 10, 100, 50...canvas.getContext) return; 4 var ctx = canvas.getContext("2d"); 5 ctx.beginPath(); //新建一条path...canvas.getContext) return; 4 var ctx = canvas.getContext("2d"); 5 ctx.beginPath(); 6 ctx.arc
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