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Last change
on this file since e4c61dd was e4c61dd, checked in by istevanoska <ilinastevanoska@…>, 6 months ago |
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Prototype 1.1
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Property mode
set to
100644
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File size:
672 bytes
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| 1 | var degrees = 180 / Math.PI;
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| 2 |
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| 3 | export var identity = {
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| 4 | translateX: 0,
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| 5 | translateY: 0,
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| 6 | rotate: 0,
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| 7 | skewX: 0,
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| 8 | scaleX: 1,
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| 9 | scaleY: 1
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| 10 | };
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| 11 |
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| 12 | export default function(a, b, c, d, e, f) {
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| 13 | var scaleX, scaleY, skewX;
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| 14 | if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
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| 15 | if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
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| 16 | if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
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| 17 | if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
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| 18 | return {
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| 19 | translateX: e,
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| 20 | translateY: f,
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| 21 | rotate: Math.atan2(b, a) * degrees,
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| 22 | skewX: Math.atan(skewX) * degrees,
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| 23 | scaleX: scaleX,
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| 24 | scaleY: scaleY
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| 25 | };
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| 26 | }
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