content/canvas/test/test_2d.gradient.linear.transform.3.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.gradient.linear.transform.3</title>
   3 <!-- Testing: Linear gradient transforms do not experience broken caching effects -->
   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 function todo_isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  23     var pixel = ctx.getImageData(x, y, 1, 1);
  24     var pr = pixel.data[0],
  25         pg = pixel.data[1],
  26         pb = pixel.data[2],
  27         pa = pixel.data[3];
  28     todo(r-d <= pr && pr <= r+d &&
  29        g-d <= pg && pg <= g+d &&
  30        b-d <= pb && pb <= b+d &&
  31        a-d <= pa && pa <= a+d,
  32        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  33 }
  34
  35 SimpleTest.waitForExplicitFinish();
  36 MochiKit.DOM.addLoadEvent(function () {
  37
  38 var canvas = document.getElementById('c');
  39 var ctx = canvas.getContext('2d');
  40
  41 var g = ctx.createLinearGradient(0, 0, 200, 0);
  42 g.addColorStop(0, '#f00');
  43 g.addColorStop(0.25, '#0f0');
  44 g.addColorStop(0.75, '#0f0');
  45 g.addColorStop(1, '#f00');
  46 ctx.fillStyle = g;
  47 ctx.fillRect(0, 0, 100, 50);
  48 ctx.translate(-50, 0);
  49 ctx.fillRect(50, 0, 100, 50);
  50 todo_isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 0);
  51 isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 0);
  52 isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 0);
  53
  54 SimpleTest.finish();
  55
  56 });
  57 </script>
  58