canvas绘制七巧板

xdyangxiaoromg

2017-02-03

效果如下所示：

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>

七巧板 canvas