gecko/content/canvas/test/test_2d.line.width.basic.html

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<!DOCTYPE HTML>
<title>Canvas test: 2d.line.width.basic</title>
<!-- Testing: lineWidth determines the width of line strokes -->
<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');
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);
ctx.lineWidth = 20;
// Draw a green line over a red box, to check the line is not too small
ctx.fillStyle = '#f00';
ctx.strokeStyle = '#0f0';
ctx.fillRect(15, 15, 20, 20);
ctx.beginPath();
ctx.moveTo(25, 15);
ctx.lineTo(25, 35);
ctx.stroke();
// Draw a green box over a red line, to check the line is not too large
ctx.fillStyle = '#0f0';
ctx.strokeStyle = '#f00';
ctx.beginPath();
ctx.moveTo(75, 15);
ctx.lineTo(75, 35);
ctx.stroke();
ctx.fillRect(65, 15, 20, 20);
isPixel(ctx, 14,25, 0,255,0,255, "14,25", "0,255,0,255", 0);
isPixel(ctx, 15,25, 0,255,0,255, "15,25", "0,255,0,255", 0);
isPixel(ctx, 16,25, 0,255,0,255, "16,25", "0,255,0,255", 0);
isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 0);
isPixel(ctx, 34,25, 0,255,0,255, "34,25", "0,255,0,255", 0);
isPixel(ctx, 35,25, 0,255,0,255, "35,25", "0,255,0,255", 0);
isPixel(ctx, 36,25, 0,255,0,255, "36,25", "0,255,0,255", 0);
isPixel(ctx, 64,25, 0,255,0,255, "64,25", "0,255,0,255", 0);
isPixel(ctx, 65,25, 0,255,0,255, "65,25", "0,255,0,255", 0);
isPixel(ctx, 66,25, 0,255,0,255, "66,25", "0,255,0,255", 0);
isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 0);
isPixel(ctx, 84,25, 0,255,0,255, "84,25", "0,255,0,255", 0);
isPixel(ctx, 85,25, 0,255,0,255, "85,25", "0,255,0,255", 0);
isPixel(ctx, 86,25, 0,255,0,255, "86,25", "0,255,0,255", 0);
SimpleTest.finish();
});
</script>