<!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> |