content/canvas/test/test_2d.path.arcTo.zero.2.html
author L. David Baron <dbaron@dbaron.org>
Wed, 06 May 2009 13:46:04 -0700
changeset 28048 8f7b73d88f6bbedec99c6c8ef48b243ab922d05c
parent 16546 c321f9d28355a35365ccccd4167a7d7225c0cf6b
child 29295 b116b49459f89a8465c2a634d1de8b3a3ac2e48d
permissions -rw-r--r--
Switch HTML mochitests from using MochiKit.js to packed.js. (Bug 490955) r=sayrer

<!DOCTYPE HTML>
<title>Canvas test: 2d.path.arcTo.zero.2</title>
<!-- Testing: arcTo() with zero radius draws a straight line from P0 to P1, even when all points are collinear -->
<script src="/MochiKit/packed.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 _thrown_outer = false;
try {

ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.lineWidth = 50;

ctx.strokeStyle = '#0f0';
ctx.beginPath();
ctx.moveTo(0, 25);
ctx.arcTo(100, 25, -100, 25, 0);
ctx.stroke();

ctx.strokeStyle = '#f00';
ctx.beginPath();
ctx.moveTo(100, 25);
ctx.arcTo(200, 25, 50, 25, 0);
ctx.stroke();

isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 0);

} catch (e) {
    _thrown_outer = true;
}
todo(!_thrown_outer, 'should not throw exception');

SimpleTest.finish();

});
</script>