| var degrees = 180 / Math.PI; |
|
|
| export var identity = { |
| translateX: 0, |
| translateY: 0, |
| rotate: 0, |
| skewX: 0, |
| scaleX: 1, |
| scaleY: 1 |
| }; |
|
|
| export default function(a, b, c, d, e, f) { |
| var scaleX, scaleY, skewX; |
| if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX; |
| if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX; |
| if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY; |
| if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX; |
| return { |
| translateX: e, |
| translateY: f, |
| rotate: Math.atan2(b, a) * degrees, |
| skewX: Math.atan(skewX) * degrees, |
| scaleX: scaleX, |
| scaleY: scaleY |
| }; |
| } |
|
|
