b2Mat22 Struct Reference

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

#include <b2Math.h>

Collaboration diagram for b2Mat22:

List of all members.

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.
void	Set (const b2Vec2 &c1, const b2Vec2 &c2)
	Initialize this matrix using columns.
void	SetIdentity ()
	Set this to the identity matrix.
void	SetZero ()
	Set this matrix to all zeros.
b2Mat22	GetInverse () const
b2Vec2	Solve (const b2Vec2 &b) const
Public Attributes
b2Vec2	ex
b2Vec2	ey

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Detailed Description

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

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Constructor & Destructor Documentation

b2Mat22::b2Mat22

(

)

[inline]

The default constructor does nothing (for performance).

b2Mat22::b2Mat22	(	const b2Vec2 &	c1,
		const b2Vec2 &	c2
	)		[inline]

Construct this matrix using columns.

b2Mat22::b2Mat22	(	float32	a11,
		float32	a12,
		float32	a21,
		float32	a22
	)		[inline]

Construct this matrix using scalars.

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Member Function Documentation

void b2Mat22::Set	(	const b2Vec2 &	c1,
		const b2Vec2 &	c2
	)		[inline]

Initialize this matrix using columns.

void b2Mat22::SetIdentity

(

)

[inline]

Set this to the identity matrix.

void b2Mat22::SetZero

(

)

[inline]

Set this matrix to all zeros.

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.

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

• b2Math.h