b2Mat22 Struct Reference

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

#include <b2_math.h>

Public Member Functions
	b2Mat22 ()
	The default constructor does nothing (for performance). More...
	b2Mat22 (const b2Vec2 &c1, const b2Vec2 &c2)
	Construct this matrix using columns. More...
	b2Mat22 (float a11, float a12, float a21, float a22)
	Construct this matrix using scalars. More...
b2Mat22	GetInverse () const
void	Set (const b2Vec2 &c1, const b2Vec2 &c2)
	Initialize this matrix using columns. More...
void	SetIdentity ()
	Set this to the identity matrix. More...
void	SetZero ()
	Set this matrix to all zeros. More...
b2Vec2	Solve (const b2Vec2 &b) const

Public Attributes
b2Vec2	ex
b2Vec2	ey

Detailed Description

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

Definition at line 171 of file b2_math.h.

Constructor & Destructor Documentation

b2Mat22() [1/3]

b2Mat22::b2Mat22 ( )

inline

The default constructor does nothing (for performance).

Definition at line 174 of file b2_math.h.

b2Mat22() [2/3]

b2Mat22::b2Mat22 ( const b2Vec2 &  c1, const b2Vec2 &  c2  )

inline

Construct this matrix using columns.

Definition at line 177 of file b2_math.h.

b2Mat22() [3/3]

b2Mat22::b2Mat22 ( float  a11, float  a12, float  a21, float  a22  )

inline

Construct this matrix using scalars.

Definition at line 184 of file b2_math.h.

Member Function Documentation

GetInverse()

b2Mat22 b2Mat22::GetInverse ( ) const

inline

Definition at line 211 of file b2_math.h.

Set()

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

inline

Initialize this matrix using columns.

Definition at line 191 of file b2_math.h.

SetIdentity()

void b2Mat22::SetIdentity ( )

inline

Set this to the identity matrix.

Definition at line 198 of file b2_math.h.

SetZero()

void b2Mat22::SetZero ( )

inline

Set this matrix to all zeros.

Definition at line 205 of file b2_math.h.

Solve()

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 227 of file b2_math.h.

Member Data Documentation

ex

b2Vec2 b2Mat22::ex

Definition at line 241 of file b2_math.h.

ey

b2Vec2 b2Mat22::ey

Definition at line 241 of file b2_math.h.

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

• b2_math.h