| <!doctype HTML> |
| <html> |
| <head> |
| <title>HTML5 Canvas Test: createlinearGradient() with two points same</title> |
| <link rel="author" title="Microsoft" href="http://www.microsoft.com" /> |
| <link rel="help" href="http://www.w3.org/TR/2dcontext/#dom-context-2d-createlineargradient" /> |
| <meta name="assert" content="If the two points in a linear gradient have identical x,y coordinates, the canvas must paint nothing." /> |
| <script type="text/javascript"> |
| function runTest() |
| { |
| var canvas = document.getElementById("canvas1"); |
| var ctx = canvas.getContext("2d"); |
| |
| // Start by drawing a left to right, green-to-blue linear gradient. |
| var lingrad = ctx.createLinearGradient(0, 50, 100, 50); |
| lingrad.addColorStop(0, "rgba(0, 255, 0, 1.0)"); |
| lingrad.addColorStop(1, "rgba(0, 0, 255, 1.0)"); |
| ctx.fillStyle = lingrad; |
| ctx.fillRect(0, 0, 100, 50); |
| |
| // Nothing must be drawn if the two points in the linear gradient are the same. |
| lingrad = ctx.createLinearGradient(100, 100, 100, 100); |
| lingrad.addColorStop(0, "rgba(255, 0, 0, 1.0)"); |
| lingrad.addColorStop(1, "rgba(255, 0, 0, 1.0)"); |
| ctx.fillStyle = lingrad; |
| ctx.fillRect(0, 0, 300, 150); |
| } |
| </script> |
| </head> |
| <body onload="runTest()"> |
| <p>Description: If the two points in a linear gradient have identical x,y coordinates, the canvas must paint nothing.</p> |
| <p>Test passes if there is one left-to-right, green-to-blue linear gradient seen on the page and no red is seen on the page.</p> |
| <canvas id="canvas1" width="300" height="150">Browser does not support HTML5 Canvas.</canvas> |
| </body> |
| </html> |
