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<title>Canvas test: 2d.transformation.rotate.wrap</title>
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<h1>2d.transformation.rotate.wrap</h1>
<p class="desc">rotate() wraps large positive values correctly</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="/images/green-100x50.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("rotate() wraps large positive values correctly");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.rotate(Math.PI * (1 + 4096)); // == pi (mod 2*pi)
// We need about pi +/- 0.001 in order to get correct-looking results
// 32-bit floats can store pi*4097 with precision 2^-10, so that should
// be safe enough on reasonable implementations
ctx.fillStyle = '#0f0';
ctx.fillRect(-100, -50, 100, 50);
_assertPixel(canvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
_assertPixel(canvas, 98,2, 0,255,0,255, "98,2", "0,255,0,255");
_assertPixel(canvas, 98,47, 0,255,0,255, "98,47", "0,255,0,255");
});
</script>