| Box2D 2.2.1 A 2D Physics Engine for Games

- Main Page
- Classes
- Files

- Class List
- Class Index
- Class Hierarchy
- Class Members

Public Member Functions | Public Attributes
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.
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

## Detailed Description

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

## Member Function Documentation

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:

- b2Math.h

All Classes Files Functions Variables Enumerations Enumerator Defines