Content - 9c1333a3611630301bba4f7e50859739dcfbf251 - 0a9ac34/offscreen-canvas/transformations/2d.transformation.rotate.wrap.html

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Tip revision: e7c6b016a1314ce1547f5d09192b304ad9c5f359 authored by Hiroshige Hayashizaki on 04 May 2018, 20:45:01 UTC
[Layered API] Add wpt tests

Tip revision: e7c6b01

2d.transformation.rotate.wrap.html

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.transformation.rotate.wrap</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>

<h1>2d.transformation.rotate.wrap</h1>
<p class="desc">rotate() wraps large positive values correctly</p>


<script>
var t = async_test("rotate() wraps large positive values correctly");
t.step(function() {

var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');

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(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
_assertPixel(offscreenCanvas, 98,2, 0,255,0,255, "98,2", "0,255,0,255");
_assertPixel(offscreenCanvas, 98,47, 0,255,0,255, "98,47", "0,255,0,255");

t.done();

});
</script>

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