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# qwmatrix.h

This is the verbatim text of the qwmatrix.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id:  qt/qwmatrix.h   3.0.0   edited Aug 14 10:49 $
    **
    ** Definition of QWMatrix class
    **
    ** Created : 941020
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
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    **********************************************************************/

    #ifndef QWMATRIX_H
    #define QWMATRIX_H

    #ifndef QT_H
    #include "qwindowdefs.h"
    #include "qpointarray.h"
    #include "qrect.h"
    #endif // QT_H

    #ifndef QT_NO_WMATRIX

    class Q_EXPORT QWMatrix					// 2D transform matrix
    {
    public:
        QWMatrix();
        QWMatrix( double m11, double m12, double m21, double m22,
    	      double dx, double dy );

        void	setMatrix( double m11, double m12, double m21, double m22,
    			   double dx,  double dy );

        double	m11() const { return _m11; }
        double	m12() const { return _m12; }
        double	m21() const { return _m21; }
        double	m22() const { return _m22; }
        double	dx()  const { return _dx; }
        double	dy()  const { return _dy; }

        void	map( int x, int y, int *tx, int *ty )	      const;
        void	map( double x, double y, double *tx, double *ty ) const;
        QRect	mapRect( const QRect & )	const;

        QPoint	map( const QPoint &p )	const { return operator *( p ); }
        QRect	map( const QRect &r )	const { return mapRect ( r ); }
        QPointArray map( const QPointArray &a ) const { return operator * ( a ); }

        void	reset();
        bool	isIdentity() const;

        QWMatrix   &translate( double dx, double dy );
        QWMatrix   &scale( double sx, double sy );
        QWMatrix   &shear( double sh, double sv );
        QWMatrix   &rotate( double a );

        bool isInvertible() const { return (_m11*_m22 - _m12*_m21) != 0; }
        QWMatrix	invert( bool * = 0 ) const;

        bool	operator==( const QWMatrix & ) const;
        bool	operator!=( const QWMatrix & ) const;
        QWMatrix   &operator*=( const QWMatrix & );

        /* we use matrix multiplication semantics here */
        QPoint operator * (const QPoint & ) const;
        QRegion operator * (const QRect & ) const;
        QRegion operator * (const QRegion & ) const;
        QPointArray operator *  ( const QPointArray &a ) const;

    private:
        QWMatrix   &bmul( const QWMatrix & );
        double	_m11, _m12;
        double	_m21, _m22;
        double	_dx,  _dy;
    };

    Q_EXPORT QWMatrix operator*( const QWMatrix &, const QWMatrix & );

    /*****************************************************************************
      QWMatrix stream functions
     *****************************************************************************/

    Q_EXPORT QDataStream &operator<<( QDataStream &, const QWMatrix & );
    Q_EXPORT QDataStream &operator>>( QDataStream &, QWMatrix & );

    #endif // QT_NO_WMATRIX

    #endif // QWMATRIX_H