gecko/content/canvas/test/test_2d.gradient.linear.transform.1.html

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HTML

<!DOCTYPE HTML>
<title>Canvas test: 2d.gradient.linear.transform.1</title>
<!-- Testing: Linear gradient coordinates are relative to the coordinate space at the time of filling -->
<script src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
var pixel = ctx.getImageData(x, y, 1, 1);
var pr = pixel.data[0],
pg = pixel.data[1],
pb = pixel.data[2],
pa = pixel.data[3];
ok(r-d <= pr && pr <= r+d &&
g-d <= pg && pg <= g+d &&
b-d <= pb && pb <= b+d &&
a-d <= pa && pa <= a+d,
"pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
}
SimpleTest.waitForExplicitFinish();
MochiKit.DOM.addLoadEvent(function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var g = ctx.createLinearGradient(0, 0, 200, 0);
g.addColorStop(0, '#f00');
g.addColorStop(0.25, '#0f0');
g.addColorStop(0.75, '#0f0');
g.addColorStop(1, '#f00');
ctx.fillStyle = g;
ctx.translate(-50, 0);
ctx.fillRect(50, 0, 100, 50);
isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 0);
isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 0);
isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 0);
SimpleTest.finish();
});
</script>