content/canvas/test/test_2d.composite.globalAlpha.range.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.composite.globalAlpha.range</title>
   3 <script src="/MochiKit/MochiKit.js"></script>
   4 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   5 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   6 <body>
   7 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   8 <script>
   9
  10 SimpleTest.waitForExplicitFinish();
  11 MochiKit.DOM.addLoadEvent(function () {
  12
  13 var canvas = document.getElementById('c');
  14 var ctx = canvas.getContext('2d');
  15
  16 ctx.globalAlpha = 0.5;
  17 var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons
  18 ctx.globalAlpha = 1.1;
  19 ok(ctx.globalAlpha == a, "ctx.globalAlpha == a");
  20 ctx.globalAlpha = -0.1;
  21 ok(ctx.globalAlpha == a, "ctx.globalAlpha == a");
  22 ctx.globalAlpha = 0;
  23 ok(ctx.globalAlpha == 0, "ctx.globalAlpha == 0");
  24 ctx.globalAlpha = 1;
  25 ok(ctx.globalAlpha == 1, "ctx.globalAlpha == 1");
  26
  27 SimpleTest.finish();
  28
  29 });
  30 </script>
  31