js-2dmath/docs/matrix22.markdown

Fast 2d geometry math: Vector2, Rectangle, Circle, Matrix2x3 (2D transformation), Circle, BoundingBox, Line2, Segment2, Intersections, Distances, Transitions (animation/tween), Random numbers, Noise

<a name="Matrix22"></a>
## Matrix22
  Stability: 0 (Anything could happen)

  2x2 matrix used for rotations 2D represented as a 5 coordinates array

  [m11:Number, m12:Number, m21:Number, m22:Number, angle:Number]

  Can be used to solve 2x2 matrices problems.

  *todo*: this need more work and testing...

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* **create** (*angle*: Number): Matrix22

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* **fromAngle** (*angle*: Number): Matrix22

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* **fromNumbers** (*m11*: Number, *m12*: Number, *m21*: Number, *m22*: Number): Matrix22

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* **zero** (): Matrix22

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* **identity** (): Matrix22

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* **copy** (*out*: Matrix22, *mat22*: Matrix22): Matrix22

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* **solve** (*out_vec2*: Vec2, *mat22*: Matrix22, *vec2*: Vec2): Vec2

  Solve A * x = b


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* **determinant** (*mat22*: Matrix22): Number

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* **setRotation** (*out*: Matrix22, *radians*: Number (Radians)): Matrix22

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* **rotate** (*out_vec2*: Vec2, *mat22*: Matrix22, *vec2*: Vec2): Vec2

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* **unrotate** (*out_vec2*: Vec2, *mat22*: Matrix22, *vec2*: Vec2): Vec2

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* **invert** (*out*: Matrix22, *mat22*: Matrix22): Matrix22