<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Transform Origin</title>
<style type="text/css" media="screen">
.container {
height: 100px;
width: 200px;
margin: 30px;
outline: 1px solid black;
}
.box {
height: 100%;
width: 100%;
padding: 5px;
margin: 5px;
border: 5px solid gray;
background-color: green;
-webkit-transform-origin: 20% 50%;
}
#results {
margin-top: 150px;
}
</style>
<script type="text/javascript" charset="utf-8">
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
}
var gTests = [
{ 'transform' : 'translate(80px, 90px)', 'result' : 'matrix(1, 0, 0, 1, 80, 90)' },
{ 'transform' : 'translate(10px, 50%)', 'result' : 'matrix(1, 0, 0, 1, 10, 60)' },
{ 'transform' : 'scale(1.2, 0.8)', 'result' : 'matrix(1.2, 0, 0, 0.8, 0, 0)' },
{ 'transform' : 'skew(-0.7rad, 20deg)', 'result' : 'matrix(1, 0.36397, -0.842288, 1, 0, 0)' },
{ 'transform' : 'rotate(45deg)', 'result' : 'matrix(0.707107, 0.707107, -0.707107, 0.707107, 0, 0)' },
];
function compareTransform(expected, computed)
{
var re = /^matrix\(([^,]+), ([^,]+), ([^,]+), ([^,]+), ([^,]+?)(?:px)?, ([^,]+?)(?:px)?\)$/;
var parsedExpected = re.exec(expected);
var parsedComputed = re.exec(computed);
for(var i = 1; i < 7; i++) {
// use +/- 0.05 to avoid problems with rounding
if (!(Math.abs(parsedComputed[i] - parsedExpected[i]) < 0.05))
return false;
}
return true;
}
function runTests()
{
var testBox = document.getElementById('test-box');
var testSpan = document.getElementById('test-span');
var resultsBox = document.getElementById('results');
gTests.forEach(function(curTest) {
// set one of our test transforms
testBox.style.webkitTransform = curTest.transform;
testSpan.style.webkitTransform = curTest.transform;
// read back computed style
var computedTransform = window.getComputedStyle(testBox).webkitTransform;
var computedSpanTransform = window.getComputedStyle(testSpan).webkitTransform;
// compare expected result to computed transformation matrix
var success = compareTransform(curTest.result, computedTransform);
var result;
if (success)
result = curTest.transform + ' expected <code>' + curTest.result + '</code> : PASS';
else
result = curTest.transform + ' expected <code>' + curTest.result + '</code>, got <code>' + computedTransform + '</code> : FAIL';
resultsBox.innerHTML += result + '<br>';
});
if (window.testRunner)
testRunner.notifyDone();
}
</script>
</head>
<body onload="runTests()">
<div class="container">
<div id="test-box" class="box"></div>
</div>
<span id="test-span" class="box"></span>
<div id="results">
</div>
</body>
</html>