JS解析CSS的transform的scale和rotate

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style>
#divTransform {
margin: 30px;
width: 200px;
height: 100px;
background-color: yellow;
/* Rotate div */
transform: rotate(9deg);
-ms-transform: rotate(9deg);
/* Internet Explorer */
-moz-transform: rotate(9deg);
/* Firefox */
-webkit-transform: rotate(9deg);
/* Safari 和 Chrome */
-o-transform: rotate(9deg);
/* Opera */
}
</style>

<body>
<div id="divTransform">
</div>
</body>
<script>
var el = document.getElementById("divTransform");
var st = window.getComputedStyle(el, null);
var tr = st.getPropertyValue("-webkit-transform") ||
st.getPropertyValue("-moz-transform") ||
st.getPropertyValue("-ms-transform") ||
st.getPropertyValue("-o-transform") ||
st.getPropertyValue("transform") ||
"FAIL";

// With rotate(30deg)...
// matrix(0.866025, 0.5, -0.5, 0.866025, 0px, 0px)
console.log('Matrix: ' + tr);

// rotation matrix - http://en.wikipedia.org/wiki/Rotation_matrix

var values = tr.split('(')[1].split(')')[0].split(',');
var a = values[0];
var b = values[1];
var c = values[2];
var d = values[3];

var scale = Math.sqrt(a * a + b * b);

console.log('Scale: ' + scale);

// arc sin, convert from radians to degrees, round
var sin = b / scale;
// next line works for 30deg but not 130deg (returns 50);
// var angle = Math.round(Math.asin(sin) * (180/Math.PI));
var angle = Math.round(Math.atan2(b, a) * (180 / Math.PI));

console.log('Rotate: ' + angle + 'deg');
</script>

</html>

本文标签:	网站制作网站建设 HTML JS
本文标题:	JS解析CSS的transform的scale和rotate
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JS解析CSS的transform的scale和rotate

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