content/canvas/test/test_2d.path.stroke.scale2.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.path.stroke.scale2</title>
   3 <!-- Testing: Stroke line widths are scaled by the current transformation matrix -->
   4 <script src="/MochiKit/MochiKit.js"></script>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 <body>
   8 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   9 <script>
  10 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  11     var pixel = ctx.getImageData(x, y, 1, 1);
  12     var pr = pixel.data[0],
  13         pg = pixel.data[1],
  14         pb = pixel.data[2],
  15         pa = pixel.data[3];
  16     ok(r-d <= pr && pr <= r+d &&
  17        g-d <= pg && pg <= g+d &&
  18        b-d <= pb && pb <= b+d &&
  19        a-d <= pa && pa <= a+d,
  20        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  21 }
  22
  23 SimpleTest.waitForExplicitFinish();
  24 MochiKit.DOM.addLoadEvent(function () {
  25
  26 var canvas = document.getElementById('c');
  27 var ctx = canvas.getContext('2d');
  28
  29 ctx.fillStyle = '#f00';
  30 ctx.fillRect(0, 0, 100, 50);
  31
  32 ctx.beginPath();
  33 ctx.rect(25, 12.5, 50, 25);
  34 ctx.save();
  35 ctx.rotate(Math.PI/2);
  36 ctx.scale(25, 50);
  37 ctx.strokeStyle = '#0f0';
  38 ctx.stroke();
  39 ctx.restore();
  40
  41 ctx.beginPath();
  42 ctx.rect(-25, -12.5, 150, 75);
  43 ctx.save();
  44 ctx.rotate(Math.PI/2);
  45 ctx.scale(25, 50);
  46 ctx.strokeStyle = '#f00';
  47 ctx.stroke();
  48 ctx.restore();
  49
  50 isPixel(ctx, 0,0, 0,255,0,255, "0,0", "0,255,0,255", 0);
  51 isPixel(ctx, 50,0, 0,255,0,255, "50,0", "0,255,0,255", 0);
  52 isPixel(ctx, 99,0, 0,255,0,255, "99,0", "0,255,0,255", 0);
  53 isPixel(ctx, 0,25, 0,255,0,255, "0,25", "0,255,0,255", 0);
  54 isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 0);
  55 isPixel(ctx, 99,25, 0,255,0,255, "99,25", "0,255,0,255", 0);
  56 isPixel(ctx, 0,49, 0,255,0,255, "0,49", "0,255,0,255", 0);
  57 isPixel(ctx, 50,49, 0,255,0,255, "50,49", "0,255,0,255", 0);
  58 isPixel(ctx, 99,49, 0,255,0,255, "99,49", "0,255,0,255", 0);
  59
  60 SimpleTest.finish();
  61
  62 });
  63 </script>
  64