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# qpainter.h

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

    /****************************************************************************
    ** $Id: qt/src/kernel/qpainter.h   2.3.1   edited 2001-04-25 $
    **
    ** Definition of QPainter class
    **
    ** Created : 940112
    **
    ** 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.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QPAINTER_H
    #define QPAINTER_H

    #ifndef QT_H
    #include "qpaintdevice.h"
    #include "qcolor.h"
    #include "qfontmetrics.h"
    #include "qfontinfo.h"
    #include "qregion.h"
    #include "qpen.h"
    #include "qbrush.h"
    #include "qpointarray.h"
    #include "qwmatrix.h"
    #endif // QT_H

    class QGfx;
    class QTextCodec;

    class Q_EXPORT QPainter : public Qt
    {
    public:
        QPainter();
        QPainter( const QPaintDevice * );
        QPainter( const QPaintDevice *, const QWidget * );
       ~QPainter();

        bool        begin( const QPaintDevice * );
        bool        begin( const QPaintDevice *, const QWidget * );
        bool        end();
        QPaintDevice *device() const;

    #ifdef _WS_QWS_
        QGfx * internalGfx();
    #endif

        static void redirect( QPaintDevice *pdev, QPaintDevice *replacement );

        bool        isActive() const;

        void        flush();
        void        save();
        void        restore();

      // Drawing tools

        QFontMetrics fontMetrics()  const;
        QFontInfo    fontInfo()     const;

        const QFont &font()         const;
        void        setFont( const QFont & );
        const QPen &pen()           const;
        void        setPen( const QPen & );
        void        setPen( PenStyle );
        void        setPen( const QColor & );
        const QBrush &brush()       const;
        void        setBrush( const QBrush & );
        void        setBrush( BrushStyle );
        void        setBrush( const QColor & );
        QPoint      pos() const;

      // Drawing attributes/modes

        const QColor &backgroundColor() const;
        void        setBackgroundColor( const QColor & );
        BGMode      backgroundMode() const;
        void        setBackgroundMode( BGMode );
        RasterOp    rasterOp()      const;
        void        setRasterOp( RasterOp );
        const QPoint &brushOrigin() const;
        void        setBrushOrigin( int x, int y );
        void        setBrushOrigin( const QPoint & );

      // Scaling and transformations

    //    PaintUnit unit()         const;           // get set painter unit
    //    void      setUnit( PaintUnit );           // NOT IMPLEMENTED!!!

        bool        hasViewXForm() const;
        bool        hasWorldXForm() const;

    #ifndef QT_NO_TRANSFORMATIONS
        void        setViewXForm( bool );           // set xform on/off
        QRect       window()       const;           // get window
        void        setWindow( const QRect & );     // set window
        void        setWindow( int x, int y, int w, int h );
        QRect       viewport()   const;             // get viewport
        void        setViewport( const QRect & );   // set viewport
        void        setViewport( int x, int y, int w, int h );

        void        setWorldXForm( bool );          // set world xform on/off
        const QWMatrix &worldMatrix() const;        // get/set world xform matrix
        void        setWorldMatrix( const QWMatrix &, bool combine=FALSE );

        void        saveWorldMatrix();
        void        restoreWorldMatrix();

        void        scale( double sx, double sy );
        void        shear( double sh, double sv );
        void        rotate( double a );
    #endif
        void        translate( double dx, double dy );
        void        resetXForm();

        QPoint      xForm( const QPoint & ) const;  // map virtual -> device
        QRect       xForm( const QRect & )  const;
        QPointArray xForm( const QPointArray & ) const;
        QPointArray xForm( const QPointArray &, int index, int npoints ) const;
        QPoint      xFormDev( const QPoint & ) const; // map device -> virtual
        QRect       xFormDev( const QRect & )  const;
        QPointArray xFormDev( const QPointArray & ) const;
        QPointArray xFormDev( const QPointArray &, int index, int npoints ) const;

      // Clipping

        void        setClipping( bool );            // set clipping on/off
        bool        hasClipping() const;
        const QRegion &clipRegion() const;
        void        setClipRect( const QRect & );   // set clip rectangle
        void        setClipRect( int x, int y, int w, int h );
        void        setClipRegion( const QRegion &);// set clip region

      // Graphics drawing functions

        void        drawPoint( int x, int y );
        void        drawPoint( const QPoint & );
        void        drawPoints( const QPointArray& a,
                                int index=0, int npoints=-1 );
        void        moveTo( int x, int y );
        void        moveTo( const QPoint & );
        void        lineTo( int x, int y );
        void        lineTo( const QPoint & );
        void        drawLine( int x1, int y1, int x2, int y2 );
        void        drawLine( const QPoint &, const QPoint & );
        void        drawRect( int x, int y, int w, int h );
        void        drawRect( const QRect & );
        void        drawWinFocusRect( int x, int y, int w, int h );
        void        drawWinFocusRect( int x, int y, int w, int h,
                                      const QColor &bgColor );
        void        drawWinFocusRect( const QRect & );
        void        drawWinFocusRect( const QRect &,
                                      const QColor &bgColor );
        void        drawRoundRect( int x, int y, int w, int h, int, int );
        void        drawRoundRect( const QRect &, int, int );
        void        drawRoundRect( int x, int y, int w, int h );
        void        drawRoundRect( const QRect & );
        void        drawEllipse( int x, int y, int w, int h );
        void        drawEllipse( const QRect & );
        void        drawArc( int x, int y, int w, int h, int a, int alen );
        void        drawArc( const QRect &, int a, int alen );
        void        drawPie( int x, int y, int w, int h, int a, int alen );
        void        drawPie( const QRect &, int a, int alen );
        void        drawChord( int x, int y, int w, int h, int a, int alen );
        void        drawChord( const QRect &, int a, int alen );
        void        drawLineSegments( const QPointArray &,
                                      int index=0, int nlines=-1 );
        void        drawPolyline( const QPointArray &,
                                  int index=0, int npoints=-1 );
        void        drawPolygon( const QPointArray &, bool winding=FALSE,
                                 int index=0, int npoints=-1 );
        void        drawQuadBezier( const QPointArray &, int index=0 );
        void        drawPixmap( int x, int y, const QPixmap &,
                                int sx=0, int sy=0, int sw=-1, int sh=-1 );
        void        drawPixmap( const QPoint &, const QPixmap &,
                                const QRect &sr );
        void        drawPixmap( const QPoint &, const QPixmap & );
        void        drawImage( int x, int y, const QImage &,
                               int sx=0, int sy=0, int sw=-1, int sh=-1 );
        void        drawImage( const QPoint &, const QImage &, const QRect &sr );
        void        drawImage( const QPoint &, const QImage & );
        void        drawImage( int x, int y, const QImage &,
                               int sx, int sy, int sw, int sh, int conversion_flags );
        void        drawImage( const QPoint &, const QImage &, const QRect &sr, int conversion_flags );
        void        drawImage( const QPoint &, const QImage &, int conversion_flags );
        void        drawTiledPixmap( int x, int y, int w, int h, const QPixmap &,
                                     int sx=0, int sy=0 );
        void        drawTiledPixmap( const QRect &, const QPixmap &,
                                     const QPoint & );
        void        drawTiledPixmap( const QRect &, const QPixmap & );
    #ifndef QT_NO_PICTURE
        void        drawPicture( const QPicture & );
    #endif

        void        fillRect( int x, int y, int w, int h, const QBrush & );
        void        fillRect( const QRect &, const QBrush & );
        void        eraseRect( int x, int y, int w, int h );
        void        eraseRect( const QRect & );

      // Text drawing functions

        void        drawText( int x, int y, const QString &, int len = -1 );
        void        drawText( const QPoint &, const QString &, int len = -1 );
        void        drawText( int x, int y, int w, int h, int flags,
                              const QString&, int len = -1, QRect *br=0,
                              char **internal=0 );
        void        drawText( const QRect &, int flags,
                              const QString&, int len = -1, QRect *br=0,
                              char **internal=0 );

        //#####    void     drawText( const QPoint &, const QString &, int flags, int rotation = 0);

      // Text drawing functions

        QRect       boundingRect( int x, int y, int w, int h, int flags,
                                  const QString&, int len = -1, char **intern=0 );
        QRect       boundingRect( const QRect &, int flags,
                                  const QString&, int len = -1, char **intern=0 );

        int         tabStops() const;
        void        setTabStops( int );
        int        *tabArray() const;
        void        setTabArray( int * );

        // Other functions

    #if defined(_WS_WIN_)
        HDC         handle() const;
    #elif defined(_WS_X11_)
        HANDLE      handle() const;
    #endif

        static void initialize();
        static void cleanup();

    private:
        void        init();
        void        updateFont();
        void        updatePen();
        void        updateBrush();
    #ifndef QT_NO_TRANSFORMATIONS
        void        updateXForm();
        void        updateInvXForm();
    #endif
        void        map( int, int, int *rx, int *ry ) const;
        void        map( int, int, int, int, int *, int *, int *, int * ) const;
        void        mapInv( int, int, int *, int * ) const;
        void        mapInv( int, int, int, int, int *, int *, int *, int * ) const;
        void        drawPolyInternal( const QPointArray &, bool close=TRUE );
        void        drawWinFocusRect( int x, int y, int w, int h, bool xorPaint,
                                      const QColor &penColor );

        enum { IsActive=0x01, ExtDev=0x02, IsStartingUp=0x04, NoCache=0x08,
               VxF=0x10, WxF=0x20, ClipOn=0x40, SafePolygon=0x80, MonoDev=0x100,
               DirtyFont=0x200, DirtyPen=0x400, DirtyBrush=0x800,
               RGBColor=0x1000, FontMet=0x2000, FontInf=0x4000, CtorBegin=0x8000,
               UsePrivateCx=0x10000, VolatileDC=0x20000, PaintEventClipOn=0x40000 };
        uint        flags;
        bool        testf( uint b ) const { return (flags&b)!=0; }
        void        setf( uint b )  { flags |= b; }
        void        setf( uint b, bool v );
        void        clearf( uint b )        { flags &= (uint)(~b); }
        void        fix_neg_rect( int *x, int *y, int *w, int *h );

        QPaintDevice *pdev;
        QColor      bg_col;
        uchar       bg_mode;
        uchar       rop;
        uchar       pu;
        QPoint      bro;
        QFont       cfont;
        QPen        cpen;
        QBrush      cbrush;
        QRegion     crgn;
        int         tabstops;
        int        *tabarray;
        int         tabarraylen;

        // Transformations
    #ifndef QT_NO_TRANSFORMATIONS
        QCOORD      wx, wy, ww, wh;
        QCOORD      vx, vy, vw, vh;
        QWMatrix    wxmat;

        // Cached composition (and inverse) of transformations
        QWMatrix    xmat;
        QWMatrix    ixmat;

        double      m11() const { return xmat.m11(); }
        double      m12() const { return xmat.m12(); }
        double      m21() const { return xmat.m21(); }
        double      m22() const { return xmat.m22(); }
        double      dx() const { return xmat.dx(); }
        double      dy() const { return xmat.dy(); }
        double      im11() const { return ixmat.m11(); }
        double      im12() const { return ixmat.m12(); }
        double      im21() const { return ixmat.m21(); }
        double      im22() const { return ixmat.m22(); }
        double      idx() const { return ixmat.dx(); }
        double      idy() const { return ixmat.dy(); }

        int         txop;
        bool        txinv;

    #else
        // even without transformations we still have translations
        int         xlatex;
        int         xlatey;
    #endif

        void       *penRef;                         // pen cache ref
        void       *brushRef;                       // brush cache ref
        void       *ps_stack;
        void       *wm_stack;
        void        killPStack();

    protected:
    #if defined(_WS_WIN_)
        QT_WIN_PAINTER_MEMBERS
    #elif defined(_WS_X11_)
        Display    *dpy;                            // current display
        WId         hd;                             // handle to drawable
        GC          gc;                             // graphics context (standard)
        GC          gc_brush;                       // graphics contect for brush
        QPoint      curPt;                          // current point
    #elif defined(_WS_MAC_)
        int penx;
        int peny;
        void * hd;
    #elif defined(_WS_QWS_)
        QGfx * gfx;
    #endif
        friend class QFontMetrics;
        friend class QFontInfo;
        friend void qt_format_text( const QFontMetrics& fm, int x, int y, int w, int h,
                         int tf, const QString& str, int len, QRect *brect,
                         int tabstops, int* tabarray, int tabarraylen,
                         char **internal, QPainter* painter );

    private:        // Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QPainter( const QPainter & );
        QPainter &operator=( const QPainter & );
    #endif
    };

    /*****************************************************************************
      QPainter member functions
     *****************************************************************************/

    inline QPaintDevice *QPainter::device() const
    {
        return pdev;
    }

    inline bool QPainter::isActive() const
    {
        return testf(IsActive);
    }

    inline const QFont &QPainter::font() const
    {
        return cfont;
    }

    inline const QPen &QPainter::pen() const
    {
        return cpen;
    }

    inline const QBrush &QPainter::brush() const
    {
        return cbrush;
    }

    /*
    inline PaintUnit QPainter::unit() const
    {
        return (PaintUnit)pu;
    }
    */

    inline const QColor &QPainter::backgroundColor() const
    {
        return bg_col;
    }

    inline Qt::BGMode QPainter::backgroundMode() const
    {
        return (BGMode)bg_mode;
    }

    inline Qt::RasterOp QPainter::rasterOp() const
    {
        return (RasterOp)rop;
    }

    inline const QPoint &QPainter::brushOrigin() const
    {
        return bro;
    }

    inline bool QPainter::hasViewXForm() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return testf(VxF);
    #else
        return xlatex || xlatey;
    #endif
    }

    inline bool QPainter::hasWorldXForm() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return testf(WxF);
    #else
        return xlatex || xlatey;
    #endif
    }

    inline bool QPainter::hasClipping() const
    {
        return testf(ClipOn);
    }

    inline const QRegion &QPainter::clipRegion() const
    {
        return crgn;
    }

    inline int QPainter::tabStops() const
    {
        return tabstops;
    }

    inline int *QPainter::tabArray() const
    {
        return tabarray;
    }

    #if defined(_WS_WIN_)
    inline HDC QPainter::handle() const
    {
        return hdc;
    }
    #elif defined(_WS_X11_)
    inline HANDLE QPainter::handle() const
    {
        return hd;
    }
    #endif

    inline void QPainter::setBrushOrigin( const QPoint &p )
    {
        setBrushOrigin( p.x(), p.y() );
    }

    #ifndef QT_NO_TRANSFORMATIONS
    inline void QPainter::setWindow( const QRect &r )
    {
        setWindow( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::setViewport( const QRect &r )
    {
        setViewport( r.x(), r.y(), r.width(), r.height() );
    }
    #endif

    inline void QPainter::setClipRect( int x, int y, int w, int h )
    {
        setClipRect( QRect(x,y,w,h) );
    }

    inline void QPainter::drawPoint( const QPoint &p )
    {
        drawPoint( p.x(), p.y() );
    }

    inline void QPainter::moveTo( const QPoint &p )
    {
        moveTo( p.x(), p.y() );
    }

    inline void QPainter::lineTo( const QPoint &p )
    {
        lineTo( p.x(), p.y() );
    }

    inline void QPainter::drawLine( const QPoint &p1, const QPoint &p2 )
    {
        drawLine( p1.x(), p1.y(), p2.x(), p2.y() );
    }

    inline void QPainter::drawRect( const QRect &r )
    {
        drawRect( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawWinFocusRect( const QRect &r )
    {
        drawWinFocusRect( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawWinFocusRect( const QRect &r,const QColor &penColor )
    {
        drawWinFocusRect( r.x(), r.y(), r.width(), r.height(), penColor );
    }

    inline void QPainter::drawRoundRect( const QRect &r, int xRnd, int yRnd )
    {
        drawRoundRect( r.x(), r.y(), r.width(), r.height(), xRnd, yRnd );
    }

    inline void QPainter::drawRoundRect( const QRect &r )
    {
        // ### Qt 3.0 make one func. with def. args.
        drawRoundRect( r.x(), r.y(), r.width(), r.height(), 25, 25 );
    }

    inline void QPainter::drawRoundRect( int x, int y, int w, int h )
    {
        // ### Qt 3.0 make one func. with def. args.
        drawRoundRect( x, y, w, h, 25, 25 );
    }

    inline void QPainter::drawEllipse( const QRect &r )
    {
        drawEllipse( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawArc( const QRect &r, int a, int alen )
    {
        drawArc( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawPie( const QRect &r, int a, int alen )
    {
        drawPie( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawChord( const QRect &r, int a, int alen )
    {
        drawChord( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawPixmap( const QPoint &p, const QPixmap &pm,
                                      const QRect &sr )
    {
        drawPixmap( p.x(), p.y(), pm, sr.x(), sr.y(), sr.width(), sr.height() );
    }

    inline void QPainter::drawImage( const QPoint &p, const QImage &pm,
                                     const QRect &sr )
    {
        drawImage( p.x(), p.y(), pm, sr.x(), sr.y(), sr.width(), sr.height() );
    }

    inline void QPainter::drawTiledPixmap( const QRect &r, const QPixmap &pm,
                                           const QPoint &sp )
    {
        drawTiledPixmap( r.x(), r.y(), r.width(), r.height(), pm, sp.x(), sp.y() );
    }

    inline void QPainter::drawTiledPixmap( const QRect &r, const QPixmap &pm )
    {
        drawTiledPixmap( r.x(), r.y(), r.width(), r.height(), pm, 0, 0 );
    }

    inline void QPainter::fillRect( const QRect &r, const QBrush &brush )
    {
        fillRect( r.x(), r.y(), r.width(), r.height(), brush );
    }

    inline void QPainter::eraseRect( int x, int y, int w, int h )
    {
        fillRect( x, y, w, h, backgroundColor() );
    }

    inline void QPainter::eraseRect( const QRect &r )
    {
        fillRect( r.x(), r.y(), r.width(), r.height(), backgroundColor() );
    }

    inline void QPainter::drawText( const QPoint &p, const QString &s, int len )
    {
        drawText( p.x(), p.y(), s, len );
    }

    inline void QPainter::drawText( const QRect &r, int tf,
                                    const QString& str, int len, QRect *br, char **i )
    {
        drawText( r.x(), r.y(), r.width(), r.height(), tf, str, len, br, i );
    }

    inline QRect QPainter::boundingRect( const QRect &r, int tf,
                                         const QString& str, int len, char **i )
    {
        return boundingRect( r.x(), r.y(), r.width(), r.height(), tf, str, len,
                             i );
    }

    #if defined(_WS_WIN_)
    inline void *QPainter::textMetric()
    {
        if ( testf(DirtyFont) )
            updateFont();
        return textmet;
    }
    #endif

    #if defined(_WS_QWS_)
    inline QGfx * QPainter::internalGfx()
    {
        return gfx;
    }
    #endif

    #endif // QPAINTER_H