content/canvas/test/test_2d.gradient.linear.transform.1.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.gradient.linear.transform.1</title>
   3 <!-- Testing: Linear gradient coordinates are relative to the coordinate space at the time of filling -->
   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 var g = ctx.createLinearGradient(0, 0, 200, 0);
  30 g.addColorStop(0, '#f00');
  31 g.addColorStop(0.25, '#0f0');
  32 g.addColorStop(0.75, '#0f0');
  33 g.addColorStop(1, '#f00');
  34 ctx.fillStyle = g;
  35 ctx.translate(-50, 0);
  36 ctx.fillRect(50, 0, 100, 50);
  37 isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 0);
  38 isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 0);
  39 isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 0);
  40
  41 SimpleTest.finish();
  42
  43 });
  44 </script>
  45