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canvas绘制多边形

时间:2021-07-01 10:21:17 帮助过:39人阅读

效果图:

canvas绘制多边形

代码如下:

<!doctype html>
<html>
<head>
 <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
 <title>canvas 画多边形</title>
</head>
<body>
 <canvas id="myCanvas" width="500" height="500"></canvas>
</body>
<script>
 var canvas = document.getElementById("myCanvas");
 var ctx = canvas.getContext('2d');
 function draw(x,y,n,r){
  var i,ang;
  ang= Math.PI*2/n;
  ctx.save();
  ctx.fillStyle = 'rgba(255,0,0,.3)';
  ctx.strokeStyle = 'hsl(120,50%,50%)';
  ctx.lineWidth = 1;
  ctx.translate(x,y);
  ctx.moveTo(0,-r);
  ctx.beginPath();
  for(i=0;i<n;i++){
   ctx.rotate(ang);
   ctx.lineTo(0,-r);
  }
  ctx.closePath();
  ctx.fill();
  ctx.stroke();
  ctx.restore();
 }
 draw(100,100,3,40); 
 draw(200,100,4,40);
 draw(300,100,5,40);
 draw(100,200,6,40);
 draw(200,200,7,40);
 draw(300,200,8,40);
</script>
</html>

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