html5 canvas绘制矩形和圆形的实例代码
JavaScript Code复制内容到剪贴板
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="UTF-8">
- <title></title>
- </head>
- <body onload="draw(),drawarc()">
- <!--绘制的步骤：获取canvas元素->取得上下文->填充与绘制边框->设定绘图样式-->
- <!--绘制其他复杂图形需要使用路径：开始创建路径->创建图形路径->关闭路径->绘制图形-->
- <!--eg:绘制矩形-->
- 绘制矩形:<canvas id="ca"></canvas><br />
- 绘制圆形：<canvas id="yuan"></canvas>
- </body>
- </html>
- <script>
-
- function draw(){
- var canvas=document.getElementById('ca');
- if (canvas==null)
- return false;
- var context=canvas.getContext('2d');
- context.fillStyle='#EEEFF';
- context.fillRect(0,0,400,300);
- context.fillStyle='red';
- context.strokeStyle='blue';
- context.lineWidth=1;
- context.fillRect(50,50,100,100);
- context.strokeRect(50,50,100,100);
-
- }
-
- function drawarc(){
- var canvas2=document.getElementById('yuan');
- if (canvas2==null)
- if(canvas2==null)
- return false;
- var context2=canvas2.getContext('2d');
- context2.fillStyle='#EEEEEF';
- context2.fillRect(0,0,400,300);
- var n=0;
- for(var i=0;i<10;i++){
- context2.beginPath();
- context2.arc(i*25,i*25,i*10,0,Math.PI*2,true);
- context2.closePath();
- context2.fillStyle='Rgba(255,0,0,0.25)';
- context2.fill();
- }
- }
-
-
- </script>
以上就是小编为大家带来的html5 canvas绘制矩形和圆形的实例代码的全部内容了，希望大家多多支持脚步之家。
