| <!DOCTYPE html> |
| <title>Canvas test: 2d.transformation.rotate.wrap</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.transformation.html">transformation</a>.<a href="index.2d.transformation.rotate.html">rotate</a>.wrap</h1> |
| <p class="desc">rotate() wraps large positive values correctly</p> |
| |
| <div class="refs">Spec references: |
| <ul> |
| <li><a href="../annotated-spec/canvas.html#testrefs.2d.transformation.rotate">2d.transformation.rotate</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> |
| <p class="output expectedtext">Expected output:<p><img src="../resources/green-100x50.png" class="output expected" id="expected" alt=""> |
| <ul id="d"></ul> |
| <script> |
| _addTest(function(canvas, ctx) { |
| |
| ctx.fillStyle = '#f00'; |
| ctx.fillRect(0, 0, 100, 50); |
| |
| ctx.rotate(Math.PI * (1 + 4096)); // == pi (mod 2*pi) |
| // We need about pi +/- 0.001 in order to get correct-looking results |
| // 32-bit floats can store pi*4097 with precision 2^-10, so that should |
| // be safe enough on reasonable implementations |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(-100, -50, 100, 50); |
| _assertPixel(canvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255"); |
| _assertPixel(canvas, 98,2, 0,255,0,255, "98,2", "0,255,0,255"); |
| _assertPixel(canvas, 98,47, 0,255,0,255, "98,47", "0,255,0,255"); |
| |
| |
| }); |
| </script> |
| |
