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#ifndef MATH_UMATRIX_H
#define MATH_UMATRIX_H
/*
GLT OpenGL C++ Toolkit (LGPL)
Copyright (C) 2000-2002 Nigel Stewart
Email: nigels@nigels.com
WWW: http://www.nigels.com/glt/
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! \file
\brief 4 GltUnMatrix
\ingroup Math
*/
#include <iosfwd>
#include "glt_real.h"
#include "glt_vector3.h"
class GltMatrix;
////////////////////////// GltUnMatrix /////////////////////////////////
/*! \enum UnMatrixField
\brief 4x4 GltUnMatrix Field
\ingroup Math
\author Nigel Stewart, RMIT (nigels@nigels.com)
\author Spencer W. Thomas, University of Michigan
\todo Replace enums with descriptive class interface.
*/
typedef enum
{
U_SCALEX = 0,
U_SCALEY,
U_SCALEZ,
U_SHEARXY,
U_SHEARXZ,
U_SHEARYZ,
U_ROTATEX,
U_ROTATEY,
U_ROTATEZ,
U_TRANSX,
U_TRANSY,
U_TRANSZ,
U_PERSPX,
U_PERSPY,
U_PERSPZ,
U_PERSPW,
U_MAX
} UnMatrixField;
/*! \class GltUnMatrix
\brief 4x4 GltUnMatrix
\ingroup Math
\author Nigel Stewart, RMIT (nigels@nigels.com)
\author Spencer W. Thomas, University of Michigan
Graphics Gems II - Decomposing a matrix into simple transformations. Pg. 320
The unmatrix subroutine fills in a vector of floating point
values. These symbols make it easier to get the data back out.
*/
class GltUnMatrix
{
friend class GltMatrix;
friend std::ostream &operator<<(std::ostream &os,const UnMatrixField &field);
friend std::ostream &operator<<(std::ostream &os,const GltUnMatrix &unMatrix);
friend std::istream &operator>>(std::istream &is,UnMatrixField &field);
friend std::istream &operator>>(std::istream &is,GltUnMatrix &unMatrix);
friend GltUnMatrix operator-(const GltUnMatrix &b,const GltUnMatrix &a);
friend GltUnMatrix operator*(const GltUnMatrix &a,const double scaleFactor);
friend GltUnMatrix operator+(const GltUnMatrix &a,const GltUnMatrix &b);
public:
/// Constructor
GltUnMatrix();
/// Copy Constructor
GltUnMatrix(const GltUnMatrix &);
/// Construct from 4x4 matrix
GltUnMatrix(const GltMatrix &matrix);
/// Destructor
~GltUnMatrix();
/// Is the scale uniform?
bool uniformScale (const double tol = 1.0e-4) const;
/// Is there no rotation transformation?
bool noRotation (const double tol = 1.0e-4) const;
/// Is there no shear transformation?
bool noShear (const double tol = 1.0e-4) const;
/// Is there no perspective transformation?
bool noPerspective(const double tol = 1.0e-4) const;
/// Access GltUnMatrix fields
double &operator[](const UnMatrixField field) { return _tran[field]; };
private:
double _tran[16];
};
#endif
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