Box2D: b2Mat22 Struct Reference

b2Mat22 Struct Reference

A 2-by-2 matrix. Stored in column-major order. More...


Public Member Functions
	b2Mat22 ()
	The default constructor does nothing (for performance).
	b2Mat22 (const b2Vec2 &c1, const b2Vec2 &c2)
	Construct this matrix using columns.
	b2Mat22 (float32 a11, float32 a12, float32 a21, float32 a22)
	Construct this matrix using scalars.
	b2Mat22 (float32 angle)
	Construct this matrix using an angle.
void	Set (const b2Vec2 &c1, const b2Vec2 &c2)
	Initialize this matrix using columns.
void	Set (float32 angle)
	Initialize this matrix using an angle.
void	SetIdentity ()
	Set this to the identity matrix.
void	SetZero ()
	Set this matrix to all zeros.
float32	GetAngle () const
	Extract the angle from this matrix (assumed to be a rotation matrix).
b2Vec2	Solve (const b2Vec2 &b) const
	Solve A * x = b, where b is a column vector.

A 2-by-2 matrix. Stored in column-major order.

b2Mat22::b2Mat22 ( float32 angle ) [inline, explicit]

Construct this matrix using an angle.

This matrix becomes an orthonormal rotation matrix.

void b2Mat22::Set ( float32 angle ) [inline]

Initialize this matrix using an angle.

This matrix becomes an orthonormal rotation matrix.

float32 b2Mat22::GetAngle ( ) const [inline]

Extract the angle from this matrix (assumed to be a rotation matrix).

b2Vec2 b2Mat22::Solve ( const b2Vec2 & b ) const [inline]

Solve A * x = b, where b is a column vector.

This is more efficient than computing the inverse in one-shot cases.

The documentation for this struct was generated from the following file:

Generated on Sun Apr 13 15:21:27 2008 for Box2D by

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