怎么样使用Canvas绘制七巧板?

怎么样使用Canvas绘制七巧板?

效果如下所示:

怎么样使用Canvas绘制七巧板?

代码分享:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Canvas七巧板</title>
</head>
<body>
 <canvas id="canvas" style=" border: 1px solid #aaa;display:block;margin:50px auto;"></canvas>
 <script type="text/javascript">
  var tangram = [
   {p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:'#caff67'},
   {p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:'#67becf'},
   {p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:'#ef3d61'},
   {p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:'#f9f51a'},
   {p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:'#a594c0'},
   {p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:'#fa8ecc'},
   {p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:'#f6ca29'}
  ]
//  定义一个存放绘制路径和颜色的数组
  window.onload=function (){
   var canvas=document.getElementById('canvas');
//   获取canvas
   canvas.width = 800;
   canvas.height = 800;
//   定义画布的宽高
   var context=canvas.getContext('2d');
//   创建画布
   for( var i=0; i<tangram.length; i++){
    draw(tangram[i],context);
//    遍历数组tangram执行函数draw

   }
//   draw这个函数
   function draw(piece,cxt){
    cxt.beginPath();
//    开始路径的创建
    cxt.moveTo( piece.p[0].x , piece.p[0].y );
//    从这个坐标开始
    for( var i=1; i<piece.p.length; i++)
//     遍历数组中的p属性
     cxt.lineTo(piece.p[i].x , piece.p[i].y);
//    画路径到这个坐标
     cxt.closePath();
//     关闭这条打开的路径

     cxt.fillStyle = piece.color;
     cxt.fill();
//     给绘制的形状填充颜色
   }
  }
 </script>
</body>
</html>

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