Box2D 2.4.1
A 2D physics engine for games
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A 2-by-2 matrix. Stored in column-major order. More...
#include <b2_math.h>
Public Member Functions | |
b2Mat22 ()=default | |
The default constructor does nothing (for performance). | |
b2Mat22 (const b2Vec2 &c1, const b2Vec2 &c2) | |
Construct this matrix using columns. | |
b2Mat22 (float a11, float a12, float a21, float 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 |
A 2-by-2 matrix. Stored in column-major order.
Solve A * x = b, where b is a column vector. This is more efficient than computing the inverse in one-shot cases.