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Matrix33 Class Reference

3x3 Matrix Used to represent a homogeneous 2D affine transform. More...

#include <Matrix33.h>

List of all members.

Public Types
enum	Matrix33_init { IDENTITY, ZERO }
enum	Matrix33_init_d { ROTATE, SCALE }
enum	Matrix33_init_v { TRANSLATE, SCALE_XY }
Public Methods
	Matrix33 (void)
	Default constructor.
	Matrix33 (Matrix33_init)
	Constructor for operations that take no arguments.
	Matrix33 (Matrix33_init_d, double)
	Constructor for operations that are defined by a double.
	Matrix33 (Matrix33_init_v, const Vector2 &)
	Constructor for operations that are defined by a ZVector2.
void	set_zero (void)
	Sets this matrix to the zero matrix.
void	set_identity (void)
	Sets this matrix to the identity matrix.
void	set_translation (const Vector2 &)
	Sets the elements of this matrix so that it represents a 2D translation of the given vector.
void	set_rotation (double angle)
	Sets the elements of this matrix so that it represents a 2D rotation about the origin by the given anti-clockwise angle in radians.
void	set_rotation (double angle, const Vector2 &origin)
	Sets the elements of this matrix so that it represents a 2D rotation about 'centre' by the given anti-clockwise angle in radians.
void	set_scale (double scale)
	Sets the elements of this matrix so that it represents a 2D scale centred on the origin by the given scale factor.
void	set_scale (const Vector2 &scale_xy)
	Sets the elements of this matrix so that it represents a 2D scale centred on the origin by the factors in X and Y given in the ZVector2.
void	transform (Vector2 *) const
	Transforms the given Vector2 by this matrix.
Matrix33	operator * (const Matrix33 &) const
	Returns the product of this matrix with the one given.
Private Attributes
double	m_elements [3][3]
	Matrix elements, [rows][cols].

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Detailed Description

3x3 Matrix Used to represent a homogeneous 2D affine transform.

The standard coordinate space has the Y-axis pointing up. Angles are measured in radians, and increase ACW.

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Member Enumeration Documentation

enum Matrix33::Matrix33_init

Enumeration values: IDENTITY  ZERO

enum Matrix33::Matrix33_init_d

Enumeration values: ROTATE  SCALE

enum Matrix33::Matrix33_init_v

Enumeration values: TRANSLATE  SCALE_XY

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Constructor & Destructor Documentation

Matrix33::Matrix33 (  void    )

Default constructor. Initialises the matrix to all 0s.

Matrix33::Matrix33 (  Matrix33_init    type )

Constructor for operations that take no arguments. The first argument should be one of the following values: IDENTITY ZERO

Matrix33::Matrix33 (  Matrix33_init_d    type, double    value )

Constructor for operations that are defined by a double. The first argument should be one of the following values: ROTATE SCALE

Matrix33::Matrix33 (  Matrix33_init_v    type, const Vector2 &    value )

Constructor for operations that are defined by a ZVector2. The first argument should be one of the following values: TRANSLATE SCALE_XY

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Member Function Documentation

Matrix33 Matrix33::operator * (  const Matrix33 &    m )  const

Returns the product of this matrix with the one given.

void Matrix33::set_identity (  void    )

Sets this matrix to the identity matrix.

void Matrix33::set_rotation (  double    a, const Vector2 &    centre )

Sets the elements of this matrix so that it represents a 2D rotation about 'centre' by the given anti-clockwise angle in radians.

void Matrix33::set_rotation (  double    a )

Sets the elements of this matrix so that it represents a 2D rotation about the origin by the given anti-clockwise angle in radians.

void Matrix33::set_scale (  const Vector2 &    s )

Sets the elements of this matrix so that it represents a 2D scale centred on the origin by the factors in X and Y given in the ZVector2.

void Matrix33::set_scale (  double    s )

Sets the elements of this matrix so that it represents a 2D scale centred on the origin by the given scale factor.

void Matrix33::set_translation (  const Vector2 &    v )

Sets the elements of this matrix so that it represents a 2D translation of the given vector.

void Matrix33::set_zero (  void    )

Sets this matrix to the zero matrix.

void Matrix33::transform (  Vector2 *    v )  const

Transforms the given Vector2 by this matrix.

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Member Data Documentation

double Matrix33::m_elements[3][3] [private]

Matrix elements, [rows][cols].

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The documentation for this class was generated from the following files:

• Matrix33.h
• Matrix33.cpp

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