# CanvasContext.strokeRect(number x, number y, number width, number height)画一个矩形(非填充)。用 setStrokeStyle 设置矩形线条的颜色,如果没设置默认是黑色。# CanvasContext.clearRect(number x, number y, number width, number height)清除画布上在该矩形区域内的内容...
Resets the rendering context, including the backing buffer, the drawing state stack, path, and styles. CanvasRenderingContext2D.isContextLost()Experimental Returnstrueif the rendering context was lost. Filters CanvasRenderingContext2D.filter Applies a CSS or SVG filter to the canvas, e.g., to cha...
object clearRect(real x, real y, real w, real h) Clears all pixels on the canvas in the rectangle specified by (x, y, w, h) to transparent black.object clip() Creates the clipping region from the current path. Any parts of the shape outside the clipping path are not displayed....
我选择的特征是：若最内层的圆半径为 1，那么所有开口之间的距离也是 1。带缺口的圆的绘制其实是圆弧...
(src,render,console.log);}else{image=newImage();image.src="graphics/image.jpg";image.onload=render;image.onerror=console.log;}functionrender(){if(context.isFast){context.clear();}else{context.clearRect(0,0,width,height);}context.translate(100,100);context.rotate(Math.PI);context.drawImage...
例如：常量当前帧=索引=〉（/scrolling/${index.toString().padStart(4, '0')}.JPG）上面显示了一...
例如：常量当前帧=索引=〉（/scrolling/${index.toString().padStart(4, '0')}.JPG）上面显示了一...
clearRect(x: number, y: number, width:number, height: number): void Clears the content in a rectangle on the canvas. Parameters Example <!-- xxx.hml --> <div> <canvas ref="canvas" style="width: 500px; height: 500px; background-color: #ffff00;"></canvas> ...
var draw = function() { var canvas = document.getElementById('canvas'); var context = canvas.getContext('2d'); context.clearRect(0, 0, canvas.width, canvas.height); var x = canvas.width / 2 var y = canvas.height / 2 context.fillStyle = 'red'; context.fillRect(20, y, canvas....
(); function redraw() { ctx.clearRect(0, 0, canvas.width, canvas.height); drawButton(button1, 20, 20); drawButton(button2, 20, 80); } function handleClick(e) { // Calculate click coordinates const x = e.clientX - canvas.offsetLeft; const y = e.clientY - canvas.offsetTop; //...