| <!DOCTYPE HTML> |
| <!-- Test based on that found at |
| http://philip.html5.org/tests/canvas/suite/tests/index.2d.transformation.transform.html |
| --> |
| <title>Canvas test: 2d.transformation.transform.skewed</title> |
| <canvas id="canvas" class="output" width="100" height="100"><p class="fallback">FAIL (fallback content)</p></canvas> |
| <script> |
| var ctx = document.getElementById("canvas").getContext("2d"); |
| // Create green with a red square ring inside it |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(0, 0, 100, 100); |
| ctx.fillStyle = '#f00'; |
| // rectangle (20, 10, 60, 30) inset by 1 pixel to allow margin for numerical error. |
| ctx.fillRect(21, 11, 58, 28); |
| ctx.fillStyle = '#0f0'; |
| // rectangle (40, 20, 20, 10) outset by one pixel to allow margin for numerical error. |
| ctx.fillRect(39, 19, 22, 12); |
| |
| // Draw a skewed shape to fill that gap, to make sure it is aligned correctly |
| ctx.transform(1,4, 2,3, 5,6); |
| |
| // Post-transform coordinates: |
| // [[20,10],[80,10],[80,40],[20,40],[20,10],[40,20],[40,30],[60,30],[60,20],[40,20],[20,10]]; |
| // Hence pre-transform coordinates: |
| var pts=[[-7.4,11.2],[-43.4,59.2],[-31.4,53.2],[4.6,5.2],[-7.4,11.2], |
| [-15.4,25.2],[-11.4,23.2],[-23.4,39.2],[-27.4,41.2],[-15.4,25.2], |
| [-7.4,11.2]]; |
| ctx.beginPath(); |
| ctx.moveTo(pts[0][0], pts[0][1]); |
| for (var i = 0; i < pts.length; ++i) |
| ctx.lineTo(pts[i][0], pts[i][1]); |
| ctx.fill(); |
| </script> |
