Canvas draws polygons

高洛峰

Release： 2017-02-25 16:05:11

Original

2525 people have browsed it

Rendering:

Canvas draws polygons

The code is as follows:

<!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(&#39;2d&#39;);
 function draw(x,y,n,r){
  var i,ang;
  ang= Math.PI*2/n;
  ctx.save();
  ctx.fillStyle = &#39;rgba(255,0,0,.3)&#39;;
  ctx.strokeStyle = &#39;hsl(120,50%,50%)&#39;;
  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>

Copy after login

For more articles related to canvas drawing polygons, please pay attention to the PHP Chinese website!

Related labels：

canvas polygon

source：php.cn

Previous article：js to achieve navigation ceiling effect Next article：Canvas realizes the effect of zooming in and out of pictures according to the slider

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn