scratchfoundation/paper.js
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Fix issues with matrix decomposition.

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Work in progress...
This commit is contained in:
Jürg Lehni 2013-02-08 22:17:32 -08:00
parent e6ca62da90
commit aec87f4ed1
1 changed files with 8 additions and 5 deletions

13
src/basic/Matrix.js
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@ -474,9 +474,12 @@ var Matrix = this.Matrix = Base.extend(/** @lends Matrix# */{
getScaling: function() {
// http://math.stackexchange.com/questions/13150/
var hor = Math.sqrt(this._a * this._a + this._c * this._c),
ver = Math.sqrt(this._b * this._b + this._d * this._d);
return Point.create(this._a < 0 ? -hor : hor, this._b < 0 ? -ver : ver);
// http://stackoverflow.com/questions/4361242/
var hor = Math.sqrt(this._a * this._a + this._b * this._b),
ver = Math.sqrt(this._c * this._c + this._d * this._d);
return Point.create(
this._a < 0 ? -hor : hor,
this._d < 0 ? -ver : ver);
},
/**
@ -488,8 +491,8 @@ var Matrix = this.Matrix = Base.extend(/** @lends Matrix# */{
* @bean
*/
getRotation: function() {
var angle1 = -Math.atan2(this._b, this._d),
angle2 = Math.atan2(this._c, this._a);
var angle1 = -Math.atan2(this._b, this._a),
angle2 = Math.atan2(this._c, this._d);
return Math.abs(angle1 - angle2) < /*#=*/ Numerical.EPSILON
? angle1 * 180 / Math.PI : undefined;
},