Use arc in canvas to draw circular patterns. The function prototype is: context.arc(x, y, radius, start angle, end angle, whether to rotate counterclockwise); so you can draw an arc by modifying the start angle and end angle.
The code is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>html5圆形</title>
<script type="text/javascript">
window.addEventListener("load",function(){
//canvas的2d上下文
var ctx=document.getElementById("canvas").getContext("2d");
//圆1
ctx.beginPath();
ctx.arc(150,45,35,0,Math.PI*2,false);
ctx.fillStyle="rgba(192,80,77,0.7)";//半透明的红色
ctx.fill();
ctx.strokeStyle="rgba(192,80,77,1)";//红色
ctx.stroke();
//圆2
ctx.beginPath();
ctx.arc(125,95,35,0,Math.PI*2,false);
ctx.fillStyle="rgba(155,187,89,0.7)";//半透明绿色
ctx.fill();
ctx.strokeStyle="rgba(155,187,89,1)";//绿色
ctx.stroke();
//圆3
ctx.beginPath();
ctx.arc(175,95,35,Math.PI*2,false);
ctx.fillStyle="rgba(128,100,162,0.7)";//半透明的紫色
ctx.fill();
ctx.strokeStyle="rgba(128,100,132,1)";//紫色
ctx.stroke();
});
</script>
</head>
<body>
<canvas id="canvas" width="600" height="600"></canvas>
</body>
</html>
The picture above shows three circles drawn tossing each other. In addition, you can directly modify the starting angle and ending arc to draw an arc.
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