dom/canvas/test/test_2d.fillText.gradient.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.composite.canvas.xor</title>
   3 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   4 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   5 <body>
   6 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   7 <script>
   8 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
   9     var pixel = ctx.getImageData(x, y, 1, 1);
  10     var pr = pixel.data[0],
  11         pg = pixel.data[1],
  12         pb = pixel.data[2],
  13         pa = pixel.data[3];
  14     ok(r-d <= pr && pr <= r+d &&
  15        g-d <= pg && pg <= g+d &&
  16        b-d <= pb && pb <= b+d &&
  17        a-d <= pa && pa <= a+d,
  18        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  19 }
  20
  21 SimpleTest.waitForExplicitFinish();
  22 addLoadEvent(function () {
  23
  24 var canvas = document.getElementById('c');
  25 var ctx = canvas.getContext('2d');
  26                                 var text                = "I";
  27                                 var colorTop    = 'rgba(255,0,0,1)';
  28                                 var colorBottom = 'rgba(0,255,0,1)';
  29                                 var inset               = 10;
  30                                 var grad                = ctx.createLinearGradient(inset, inset, inset, inset + 30);
  31
  32                                 // add color stops
  33                                 grad.addColorStop(0, colorTop);
  34                                 grad.addColorStop(1, colorBottom);
  35
  36                                 ctx.fillStyle               = grad;
  37                                 ctx.textBaseline    = 'top';
  38                                 ctx.font                    = '110px sans-serif'
  39                                 ctx.fillText(text, -10, -20);
  40                                 ctx.fillText(text, -8, -20);
  41                                 ctx.fillText(text, -6, -20);
  42                                 ctx.fillText(text, -4, -20);
  43                                 ctx.fillText(text, -2, -20);
  44                                 ctx.fillText(text, 0, -20);
  45                                 ctx.fillText(text, 2, -20);
  46                                 ctx.fillText(text, 4, -20);
  47                                 ctx.fillText(text, 6, -20);
  48
  49                                 isPixel(ctx, 15,0, 255,0,0,255, "15,0", "255,0,0,255", 5);
  50                                 isPixel(ctx, 15,49, 0,255,0,255, "15,49", "0,255,0,255", 5);
  51 SimpleTest.finish();
  52
  53 });
  54 </script>
  55