gecko/content/canvas/test/test_2d.path.arc.shape.1.html

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HTML

<!DOCTYPE HTML>
<title>Canvas test: 2d.path.arc.shape.1</title>
<script src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50" style="background: #0f0"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
var _deferred = false;
function isPixel(ctx, x,y, r,g,b,a, pos, colour, d, f) {
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];
(f || 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');
ctx.lineWidth = 50;
ctx.strokeStyle = '#f00';
ctx.beginPath();
ctx.arc(50, 50, 50, 0, Math.PI, false);
ctx.stroke();
isPixel(ctx, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 0);
isPixel(ctx, 1,1, 0,0,0,0, "1,1", "0,0,0,0", 0);
isPixel(ctx, 98,1, 0,0,0,0, "98,1", "0,0,0,0", 0);
isPixel(ctx, 1,48, 0,0,0,0, "1,48", "0,0,0,0", 0);
isPixel(ctx, 20,48, 0,0,0,0, "20,48", "0,0,0,0", 0);
isPixel(ctx, 98,48, 0,0,0,0, "98,48", "0,0,0,0", 0);
if (!_deferred) SimpleTest.finish();
});
</script>