regband.hxx

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#ifndef INCLUDED_VCL_INC_REGBAND_HXX
#define INCLUDED_VCL_INC_REGBAND_HXX

/*

class ImplRegionBand

This class handles one y-band of the region. In this band may contain one
or more separations in x-direction. The y-Band do not contain any
separation after creation.

The separations are modified with basic clipping functions like Union and
Intersection - the Class will process the clipping for the actual band.

*/

// element for the list with x-separations
struct ImplRegionBandSep
{
    ImplRegionBandSep*          mpNextSep;
    long                        mnXLeft;
    long                        mnXRight;
    bool                        mbRemoved;
};

enum class LineType { Ascending, Descending };

// element for the list with x-separations
struct ImplRegionBandPoint
{
    ImplRegionBandPoint*        mpNextBandPoint;
    long                        mnX;
    long                        mnLineId;
    bool                        mbEndPoint;
    LineType                    meLineType;
};

class ImplRegionBand
{
public:
    ImplRegionBand*             mpNextBand;         // pointer to the next element of the list
    ImplRegionBand*             mpPrevBand;         // pointer to the previous element of the list (only used temporarily)
    ImplRegionBandSep*          mpFirstSep;         // root of the list with x-separations
    ImplRegionBandPoint*        mpFirstBandPoint;   // root of the list with lines
    long                        mnYTop;             // actual boundary of the band
    long                        mnYBottom;

    bool                        mbTouched : 1;

                                // create y-band with boundaries
                                ImplRegionBand( long nYTop, long nYBottom );
                                ImplRegionBand( const ImplRegionBand & theSourceBand,
                                                const bool bIgnorePoints = true);
                                ~ImplRegionBand();

    long                        GetXLeftBoundary() const;
    long                        GetXRightBoundary() const;

                                // combine overlapping bands
    void                        OptimizeBand();

                                // generate separations from lines and process
                                // union with existing separations
    void                        ProcessPoints();
                                // insert point in the list for later processing
    bool                        InsertPoint( long nX, long nLineID,
                                             bool bEndPoint, LineType eLineType );

    void                        Union( long nXLeft, long nXRight );
    void                        Intersect( long nXLeft, long nXRight );
    void                        Exclude( long nXLeft, long nXRight );
    void                        XOr( long nXLeft, long nXRight );

    void                        MoveX( long nHorzMove );
    void                        ScaleX( double fHorzScale );

    bool                        IsInside( long nX );

    bool                        IsEmpty() const { return ((!mpFirstSep) && (!mpFirstBandPoint)); }

    bool                        operator==( const ImplRegionBand& rRegionBand ) const;

    ImplRegionBand*             SplitBand (const sal_Int32 nY);
};

#endif // INCLUDED_VCL_INC_REGBAND_HXX

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