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kicad/include/math/matrix3x3.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
*
* Matrix class (3x3)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*-
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef MATRIX3X3_H_
#define MATRIX3X3_H_
#include <math/vector2d.h>
/**
* Class MATRIX3x3 describes a general 3x3 matrix.
*
* Any linear transformation in 2D can be represented
* by a homogeneous 3x3 transformation matrix. Given a vector x, the linear transformation
* with the transformation matrix M is given as
*
* x' = M * x
*
* To represent an affine transformation, homogeneous coordinates have to be used. That means
* the 2D-vector (x, y) has to be extended to a 3D-vector by a third component (x, y, 1).
*
* Transformations can be easily combined by matrix multiplication.
*
* A * (B * x ) = (A * B) * x
* ( A, B: transformation matrices, x: vector )
*
* This class was implemented using templates, so flexible type combinations are possible.
*
*/
// Forward declaration for template friends
template <class T>
class MATRIX3x3;
template <class T>
std::ostream& operator<<( std::ostream& aStream, const MATRIX3x3<T>& aMatrix );
template <class T>
class MATRIX3x3
{
public:
T m_data[3][3];
/**
* @brief Constructor
*
* Initialize all matrix members to zero.
*/
MATRIX3x3();
/**
* @brief Constructor
*
* Initialize with given matrix members
*
* @param a00 is the component [0,0].
* @param a01 is the component [0,1].
* @param a02 is the component [0,2].
* @param a10 is the component [1,0].
* @param a11 is the component [1,1].
* @param a12 is the component [1,2].
* @param a20 is the component [2,0].
* @param a21 is the component [2,1].
* @param a22 is the component [2,2].
*/
MATRIX3x3( T a00, T a01, T a02, T a10, T a11, T a12, T a20, T a21, T a22 );
/**
* @brief Set the matrix to the identity matrix.
*
* The diagonal components of the matrix are set to 1.
*/
void SetIdentity();
/**
* @brief Set the translation components of the matrix.
*
* @param aTranslation is the translation, specified as 2D-vector.
*/
void SetTranslation( VECTOR2<T> aTranslation );
/**
* @brief Get the translation components of the matrix.
*
* @return is the translation (2D-vector).
*/
VECTOR2<T> GetTranslation() const;
/**
* @brief Set the rotation components of the matrix.
*
* The angle needs to have a positive value for an anti-clockwise rotation.
*
* @param aAngle is the rotation angle in [rad].
*/
void SetRotation( T aAngle );
/**
* @brief Set the scale components of the matrix.
*
* @param aScale contains the scale factors, specified as 2D-vector.
*/
void SetScale( VECTOR2<T> aScale );
/**
* @brief Get the scale components of the matrix.
*
* @return the scale factors, specified as 2D-vector.
*/
VECTOR2<T> GetScale() const;
/**
* @brief Compute the determinant of the matrix.
*
* @return the determinant value.
*/
T Determinant() const;
/**
* @brief Determine the inverse of the matrix.
*
* The inverse of a transformation matrix can be used to revert a transformation.
*
* x = Minv * ( M * x )
* ( M: transformation matrix, Minv: inverse transformation matrix, x: vector)
*
* @return the inverse matrix.
*/
MATRIX3x3 Inverse() const;
/**
* @brief Get the transpose of the matrix.
*
* @return the transpose matrix.
*/
MATRIX3x3 Transpose() const;
/**
* @brief Output to a stream.
*/
friend std::ostream& operator<<<T>( std::ostream& aStream, const MATRIX3x3<T>& aMatrix );
};
// Operators
//! @brief Matrix multiplication
template <class T> MATRIX3x3<T> const operator*( MATRIX3x3<T> const& aA, MATRIX3x3<T> const& aB );
//! @brief Multiplication with a 2D vector, the 3rd z-component is assumed to be 1
template <class T> VECTOR2<T> const operator*( MATRIX3x3<T> const& aA, VECTOR2<T> const& aB );
//! @brief Multiplication with a scalar
template <class T, class S> MATRIX3x3<T> const operator*( MATRIX3x3<T> const& aA, T aScalar );
template <class T, class S> MATRIX3x3<T> const operator*( T aScalar, MATRIX3x3<T> const& aMatrix );
// ----------------------
// --- Implementation ---
// ----------------------
template <class T>
MATRIX3x3<T>::MATRIX3x3()
{
for( int j = 0; j < 3; j++ )
{
for( int i = 0; i < 3; i++ )
{
m_data[i][j] = 0.0;
}
}
}
template <class T>
MATRIX3x3<T>::MATRIX3x3( T a00, T a01, T a02, T a10, T a11, T a12, T a20, T a21, T a22 )
{
m_data[0][0] = a00;
m_data[0][1] = a01;
m_data[0][2] = a02;
m_data[1][0] = a10;
m_data[1][1] = a11;
m_data[1][2] = a12;
m_data[2][0] = a20;
m_data[2][1] = a21;
m_data[2][2] = a22;
}
template <class T>
void MATRIX3x3<T>::SetIdentity( void )
{
for( int j = 0; j < 3; j++ )
{
for( int i = 0; i < 3; i++ )
{
if( i == j )
m_data[i][j] = 1.0;
else
m_data[i][j] = 0.0;
}
}
}
template <class T>
void MATRIX3x3<T>::SetTranslation( VECTOR2<T> aTranslation )
{
m_data[0][2] = aTranslation.x;
m_data[1][2] = aTranslation.y;
}
template <class T>
VECTOR2<T> MATRIX3x3<T>::GetTranslation() const
{
VECTOR2<T> result;
result.x = m_data[0][2];
result.y = m_data[1][2];
return result;
}
template <class T>
void MATRIX3x3<T>::SetRotation( T aAngle )
{
T cosValue = cos( aAngle );
T sinValue = sin( aAngle );
m_data[0][0] = cosValue;
m_data[0][1] = -sinValue;
m_data[1][0] = sinValue;
m_data[1][1] = cosValue;
}
template <class T>
void MATRIX3x3<T>::SetScale( VECTOR2<T> aScale )
{
m_data[0][0] = aScale.x;
m_data[1][1] = aScale.y;
}
template <class T>
VECTOR2<T> MATRIX3x3<T>::GetScale() const
{
VECTOR2<T> result( m_data[0][0], m_data[1][1] );
return result;
}
template <class T>
MATRIX3x3<T> const operator*( MATRIX3x3<T> const& aA, MATRIX3x3<T> const& aB )
{
MATRIX3x3<T> result;
for( int i = 0; i < 3; i++ )
{
for( int j = 0; j < 3; j++ )
{
result.m_data[i][j] = aA.m_data[i][0] * aB.m_data[0][j] +
aA.m_data[i][1] * aB.m_data[1][j] +
aA.m_data[i][2] * aB.m_data[2][j];
}
}
return result;
}
template <class T>
VECTOR2<T> const operator*( MATRIX3x3<T> const& aMatrix, VECTOR2<T> const& aVector )
{
VECTOR2<T> result( 0, 0 );
result.x = aMatrix.m_data[0][0] * aVector.x + aMatrix.m_data[0][1] * aVector.y
+ aMatrix.m_data[0][2];
result.y = aMatrix.m_data[1][0] * aVector.x + aMatrix.m_data[1][1] * aVector.y
+ aMatrix.m_data[1][2];
return result;
}
template <class T>
T MATRIX3x3<T>::Determinant() const
{
return m_data[0][0] * ( m_data[1][1] * m_data[2][2] - m_data[1][2] * m_data[2][1] )
- m_data[0][1] * ( m_data[1][0] * m_data[2][2] - m_data[1][2] * m_data[2][0] )
+ m_data[0][2] * ( m_data[1][0] * m_data[2][1] - m_data[1][1] * m_data[2][0] );
}
template <class T, class S>
MATRIX3x3<T> const operator*( MATRIX3x3<T> const& aMatrix, S aScalar )
{
MATRIX3x3<T> result;
for( int i = 0; i < 3; i++ )
{
for( int j = 0; j < 3; j++ )
{
result.m_data[i][j] = aMatrix.m_data[i][j] * aScalar;
}
}
return result;
}
template <class T, class S>
MATRIX3x3<T> const operator*( S aScalar, MATRIX3x3<T> const& aMatrix )
{
return aMatrix * aScalar;
}
template <class T>
MATRIX3x3<T> MATRIX3x3<T>::Inverse() const
{
MATRIX3x3<T> result;
result.m_data[0][0] = m_data[1][1] * m_data[2][2] - m_data[2][1] * m_data[1][2];
result.m_data[0][1] = m_data[0][2] * m_data[2][1] - m_data[2][2] * m_data[0][1];
result.m_data[0][2] = m_data[0][1] * m_data[1][2] - m_data[1][1] * m_data[0][2];
result.m_data[1][0] = m_data[1][2] * m_data[2][0] - m_data[2][2] * m_data[1][0];
result.m_data[1][1] = m_data[0][0] * m_data[2][2] - m_data[2][0] * m_data[0][2];
result.m_data[1][2] = m_data[0][2] * m_data[1][0] - m_data[1][2] * m_data[0][0];
result.m_data[2][0] = m_data[1][0] * m_data[2][1] - m_data[2][0] * m_data[1][1];
result.m_data[2][1] = m_data[0][1] * m_data[2][0] - m_data[2][1] * m_data[0][0];
result.m_data[2][2] = m_data[0][0] * m_data[1][1] - m_data[1][0] * m_data[0][1];
return result * ( 1.0 / Determinant() );
}
template <class T>
MATRIX3x3<T> MATRIX3x3<T>::Transpose() const
{
MATRIX3x3<T> result;
for( int i = 0; i < 3; i++ )
{
for( int j = 0; j < 3; j++ )
{
result.m_data[j][i] = m_data[i][j];
}
}
return result;
}
template <class T>
std::ostream& operator<<( std::ostream& aStream, const MATRIX3x3<T>& aMatrix )
{
for( int i = 0; i < 3; i++ )
{
aStream << "| ";
for( int j = 0; j < 3; j++ )
{
aStream << aMatrix.m_data[i][j];
aStream << " ";
}
aStream << "|";
aStream << "\n";
}
return aStream;
}
/* Default specializations */
typedef MATRIX3x3<double> MATRIX3x3D;
#endif /* MATRIX3X3_H_ */
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