b2Mat22 Struct Reference

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

#include <b2Math.h>

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.
b2Mat22	GetInverse () const
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.
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.

Definition at line 183 of file b2Math.h.

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Constructor & Destructor Documentation

b2Mat22::b2Mat22

(

)

[inline]

The default constructor does nothing (for performance).

Definition at line 186 of file b2Math.h.

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

Construct this matrix using columns.

Definition at line 189 of file b2Math.h.

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

Construct this matrix using scalars.

Definition at line 196 of file b2Math.h.

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Member Function Documentation

b2Mat22 b2Mat22::GetInverse

(

)

const [inline]

Definition at line 223 of file b2Math.h.

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

Initialize this matrix using columns.

Definition at line 203 of file b2Math.h.

void b2Mat22::SetIdentity

(

)

[inline]

Set this to the identity matrix.

Definition at line 210 of file b2Math.h.

void b2Mat22::SetZero

(

)

[inline]

Set this matrix to all zeros.

Definition at line 217 of file b2Math.h.

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.

Definition at line 239 of file b2Math.h.

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Member Data Documentation

b2Vec2 b2Mat22::ex

Definition at line 253 of file b2Math.h.

b2Vec2 b2Mat22::ey

Definition at line 253 of file b2Math.h.

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

• b2Math.h