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35 lines
1.8 KiB
HTML
35 lines
1.8 KiB
HTML
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<!doctype HTML>
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<html>
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<head>
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<title>HTML5 Canvas Test: createlinearGradient() with two points same</title>
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<link rel="author" title="Microsoft" href="http://www.microsoft.com" />
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<link rel="help" href="http://www.w3.org/TR/2dcontext/#dom-context-2d-createlineargradient" />
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<meta name="assert" content="If the two points in a linear gradient have identical x,y coordinates, the canvas must paint nothing." />
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<script type="text/javascript">
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function runTest()
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{
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var canvas = document.getElementById("canvas1");
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var ctx = canvas.getContext("2d");
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// Start by drawing a left to right, green-to-blue linear gradient.
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var lingrad = ctx.createLinearGradient(0, 50, 100, 50);
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lingrad.addColorStop(0, "rgba(0, 255, 0, 1.0)");
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lingrad.addColorStop(1, "rgba(0, 0, 255, 1.0)");
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ctx.fillStyle = lingrad;
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ctx.fillRect(0, 0, 100, 50);
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// Nothing must be drawn if the two points in the linear gradient are the same.
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lingrad = ctx.createLinearGradient(100, 100, 100, 100);
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lingrad.addColorStop(0, "rgba(255, 0, 0, 1.0)");
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lingrad.addColorStop(1, "rgba(255, 0, 0, 1.0)");
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ctx.fillStyle = lingrad;
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ctx.fillRect(0, 0, 300, 150);
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}
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</script>
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</head>
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<body onload="runTest()">
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<p>Description: If the two points in a linear gradient have identical x,y coordinates, the canvas must paint nothing.</p>
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<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>
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<canvas id="canvas1" width="300" height="150">Browser does not support HTML5 Canvas.</canvas>
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</body>
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</html>
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