gecko/content/canvas/test/test_2d.transformation.transform.skewed.html

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HTML

<!DOCTYPE HTML>
<title>Canvas test: 2d.transformation.transform.skewed</title>
<!-- Testing: transform() with skewy matrix transforms correctly -->
<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');
// Create green with a red square ring inside it
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = '#f00';
ctx.fillRect(20, 10, 60, 30);
ctx.fillStyle = '#0f0';
ctx.fillRect(40, 20, 20, 10);
// Draw a skewed shape to fill that gap, to make sure it is aligned correctly
ctx.transform(1,4, 2,3, 5,6);
// Post-transform coordinates:
// [[20,10],[80,10],[80,40],[20,40],[20,10],[40,20],[40,30],[60,30],[60,20],[40,20],[20,10]];
// Hence pre-transform coordinates:
var pts=[[-7.4,11.2],[-43.4,59.2],[-31.4,53.2],[4.6,5.2],[-7.4,11.2],
[-15.4,25.2],[-11.4,23.2],[-23.4,39.2],[-27.4,41.2],[-15.4,25.2],
[-7.4,11.2]];
ctx.beginPath();
ctx.moveTo(pts[0][0], pts[0][1]);
for (var i = 0; i < pts.length; ++i)
ctx.lineTo(pts[i][0], pts[i][1]);
ctx.fill();
isPixel(ctx, 21,11, 0,255,0,255, "21,11", "0,255,0,255", 0);
isPixel(ctx, 79,11, 0,255,0,255, "79,11", "0,255,0,255", 0);
isPixel(ctx, 21,39, 0,255,0,255, "21,39", "0,255,0,255", 0);
isPixel(ctx, 79,39, 0,255,0,255, "79,39", "0,255,0,255", 0);
isPixel(ctx, 39,19, 0,255,0,255, "39,19", "0,255,0,255", 0);
isPixel(ctx, 61,19, 0,255,0,255, "61,19", "0,255,0,255", 0);
isPixel(ctx, 39,31, 0,255,0,255, "39,31", "0,255,0,255", 0);
isPixel(ctx, 61,31, 0,255,0,255, "61,31", "0,255,0,255", 0);
SimpleTest.finish();
});
</script>