HTML5 canvas如何绘制圆形？（代码实例）-木庄网络博客

本文摘自PHP中文网，作者不言，侵删。

canvas能用于绘制各种图形，那么如何使用HTML5 canvas绘制一个圆形呢？本篇文章就来给大家介绍关于HTML5 canvas绘制圆形的方法，下面我们来看具体的内容。

HTML5 canvas

我们来直接看示例

代码如下

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title></title>
  <meta charset="utf-8" />
 
  <script type="text/javascript">
       function draw() {
          var canvas = document.getElementById('SimpleCanvas');
 
          if ( ! canvas || ! canvas.getContext ) {
            return false;
          }
 
          var cx = 360;
          var cy = 400;
          var radius = 36;
 
          var context = canvas.getContext('2d');
          context.beginPath();
          context.arc(cx, cy, radius, 0, 2 * Math.PI, false);
          context.fillStyle = '#9fd9ef';
          context.fill();
          context.lineWidth = 1;
          context.strokeStyle = '#00477d';
          context.stroke();
 
      }
  </script>
</head>
<body onload="draw()" style="background-color:#D0D0D0;">
  <canvas id="SimpleCanvas" width="640" height="480" style="background-color:#FFFFFF;"></canvas>
  <div>Canvas Demo</div>
</body>
</html>