Canvas/03_canvas_七巧板.html

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Page Title</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

<body>
  <canvas id="myCanvas" style="border:1px solid red;">
    当前浏览器不支持canvas，请更换浏览器后再试
  </canvas>
  <script>
    var PANELS = [{
      path: [{ x: 0, y: 0 }, { x: 800, y: 0 }, { x: 400, y: 400 }],
      color: '#caff67'
    }, {
      path: [{ x: 0, y: 0 }, { x: 400, y: 400 }, { x: 0, y: 400 }],
      color: 'blue'
    }, {
      path: [{ x: 800, y: 0 }, { x: 400, y: 400 }, { x: 800, y: 200 }],
      color: 'pink'
    }, {
      path: [{ x: 800, y: 200 }, { x: 400, y: 400 }, { x: 800, y: 800 }],
      color: '#f0a'
    }, {
      path: [{ x: 800, y: 800 }, { x: 400, y: 400 }, { x: 400, y: 800 }],
      color: '#901'
    }, {
      path: [{ x: 400, y: 800 }, { x: 400, y: 400 }, { x: 0, y: 800 }],
      color: '#bcf'
    }, {
      path: [{ x: 0, y: 800 }, { x: 400, y: 400 }, { x: 0, y: 400 }],
      color: '#fc0'
    }]

    window.onload = function () {
      var canvas = document.getElementById('myCanvas')

      canvas.width = 800
      canvas.height = 800

      var ctx = canvas.getContext('2d')

      for (var i = 0, len = PANELS.length; i < len; i++) {
        draw(PANELS[i], ctx)
      }
    }

    function draw(panel, ctx) {
      var color = panel.color
      var path = panel.path

      ctx.beginPath()
      ctx.moveTo(path[0].x, path[0].y)
      for (var i = 1, len = path.length; i < len; i++) {
        ctx.lineTo(path[i].x, path[i].y)
      }
      ctx.closePath()

      ctx.lineWidth = 3
      ctx.strokeStyle = "#333"
      ctx.fillStyle = color

      ctx.stroke()
      ctx.fill()
    }
  </script>
</body>

</html>