| <!DOCTYPE html> |
| <title>Canvas test: 2d.composite.globalAlpha.range</title> |
| <meta name="author" content="Philip Taylor"> |
| <script src="../common/canvas-tests.js"></script> |
| <link rel="stylesheet" href="../common/canvas-tests.css"> |
| <body class="show_output"> |
| |
| <h1><a href="index.2d.html">2d</a>.<a href="index.2d.composite.html">composite</a>.<a href="index.2d.composite.globalAlpha.html">globalAlpha</a>.range</h1> |
| <p class="desc"></p> |
| |
| <div class="refs">Spec references: |
| <ul> |
| <li><a href="../annotated-spec/canvas.html#testrefs.2d.composite.globalAlpha.range">2d.composite.globalAlpha.range</a> |
| </ul> |
| </div> |
| |
| <p class="output">Actual output:</p> |
| <canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas> |
| |
| <ul id="d"></ul> |
| <script> |
| _addTest(function(canvas, ctx) { |
| |
| ctx.globalAlpha = 0.5; |
| var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons |
| ctx.globalAlpha = 1.1; |
| _assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = -0.1; |
| _assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = 0; |
| _assertEqual(ctx.globalAlpha, 0, "ctx.globalAlpha", "0"); |
| ctx.globalAlpha = 1; |
| _assertEqual(ctx.globalAlpha, 1, "ctx.globalAlpha", "1"); |
| |
| |
| }); |
| </script> |
| |
