pathproc.h

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// $Id: pathproc.h 1282 2006-06-09 09:46:49Z alex $
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 */
// Definition of the processpath classes

#ifndef INC_PATHPROC
#define INC_PATHPROC

//#include "paths.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "ccobject.h" - in camtypes.h [AUTOMATICALLY REMOVED]

#define PROC_CACHE_SIZE 0x1000


/******************************************************************************************

>   class ProcessFlags

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/10/94
    Purpose:    

******************************************************************************************/

class ProcessFlags
{
public:
    ProcessFlags(BOOL flatten = TRUE, BOOL quantise = FALSE, BOOL quantiseall = FALSE);

    BYTE FlattenCurves : 1;
    BYTE QuantiseLines : 1;
    BYTE QuantiseAll : 1;
};



/******************************************************************************************

>   class ProcessPath

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/10/94
    Purpose:    

******************************************************************************************/

class ProcessPath : public CCObject
{
    CC_DECLARE_DYNAMIC(ProcessPath);

    public:
        ProcessPath(const double flat);
        ~ProcessPath();

        BOOL    Init(Path* pSource);
        BOOL    Process(const ProcessFlags& PFlags);
        
        virtual void OpenElement(PathVerb Verb, INT32 index);
        virtual BOOL NewPoint(PathVerb Verb, DocCoord* pCoord) = 0;
        virtual BOOL CloseElement(BOOL ok, PathVerb Verb, INT32 index);
        virtual void CloseFigure(void);
        
    protected:
        BOOL    FlattenCurve(INT32 Px0,INT32 Py0, INT32 Px1,INT32 Py1,
                             INT32 Px2,INT32 Py2, INT32 Px3,INT32 Py3, BOOL QuantiseAll=FALSE);
        BOOL    FlattenSplit(INT32 Px0,INT32 Py0, INT32 Px1,INT32 Py1,
                             INT32 Px2,INT32 Py2, INT32 Px3,INT32 Py3, BOOL QuantiseAll=FALSE);
        virtual BOOL InsertQuantisedLineTo(DocCoord * pEnd, DocCoord * pStart);

    protected:
        Path*       ProcSource;
        INT32*      ProcCache;              // Cache pointer for flattening
        INT32       ProcNumCached;          // Number of entries in cache
        BOOL        ProcFirstPoint;         // True if first point not processed yet
        double      ProcFlatness;           // <0 then dont flatten curves, approx 64 is good

        DocCoord    ProcPreviousEl;         // coord of previous element point
        
};


/******************************************************************************************

>   class FlattenPath

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/10/94
    Purpose:    Flattens a path to the user specified output buffer using a 
                given flatness

******************************************************************************************/

class ProcessFlatten : public ProcessPath
{
    public:
        ProcessFlatten(const double flat);
        BOOL FlattenPath(const ProcessFlags& PFlags, Path* pSource, Path* pDestin);
        virtual BOOL NewPoint(PathVerb Verb, DocCoord* pCoord);

    private:
        Path*   FlattenOutput;

};



/******************************************************************************************

>   class ProcessLength

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/10/94
    Purpose:    Calculates the length of a path

******************************************************************************************/

class ProcessLength : public ProcessPath
{
    public:
        ProcessLength(const double flat);
        BOOL PathLength(Path* Input, double* Length, INT32 Index = -1);
        virtual void OpenElement(PathVerb Verb, INT32 index);
        virtual BOOL NewPoint(PathVerb Verb, DocCoord* pCoord);
        virtual BOOL CloseElement(BOOL ok, PathVerb Verb, INT32 index);

    private:
        DocCoord PrevCoord;
        double   ElementLength;
        double   CurrLength;
        INT32    UserIndex;
};



/******************************************************************************************

>   class ProcessDistance

    Author:     Mike_Kenny (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/10/94
    Purpose:    If a platonic piece of string whose length l and endpoints (p0,p1) is laid 
                along a path [e0,e1,e2,....en], this class calculates the index of the 
                element ei, which contains p1 and the parameter mu (0<=mu<1) which can be 
                used to calculate the actual coordinate value of p1.
                
******************************************************************************************/

class ProcessDistance : public ProcessPath
{
    public:
        ProcessDistance(const double flat);
        double PathDistance(const double dist, Path* Input, INT32* index);
        virtual void OpenElement(PathVerb Verb, INT32 index);
        virtual BOOL NewPoint(PathVerb Verb, DocCoord* pCoord);
        virtual BOOL CloseElement(BOOL ok, PathVerb Verb, INT32 index);

    private:
        double      Distance;
        INT32       ElementIndex;
        double      ElementLength;
        double      ElementParam;
        DocCoord    PrevCoord;
};


/******************************************************************************************
>   class ProcessPathDistance : ProcessPath

    Author:     Ed_Cornes (Xara Group Ltd) <camelotdev@xara.com>
    Created:    9/4/95
    Purpose:    Process path to find Coord and Tangent at specified distance along path

    Additional: Diccon 2/12/99 - I have made some additions to this class with the intention
                of making it so that you can instantiate a PPD object and use it repeatedly
                to find points on a path without always traversing the path form the beginning.
                Unfortunately time pressure means that at the moment it is not finished except 
                for its particular application to the Brush.  If I get time I will 
                endeavour to make it generalised, but for now use with care.
    
******************************************************************************************/

class ProcessPathDistance : public ProcessPath
{
    public:
        ProcessPathDistance(const double flat);
        BOOL GetCoordAndTangent(DocCoord* pCoord, double* pTangent, BOOL* pFound,
                                double dist, Path* pPath, UINT32* pPressure = NULL);
        

        // version called by the nodebrushpath where previous results are cached
        INT32 GetCoordAndTangentWithCache(DocCoord* pCoord, double* pTangent, BOOL* pFound,
                                    double dist, Path* pPath, UINT32* pPressure = NULL);

        //INT32 GetCoordTangentAndPressure(DocCoord* pCoord, double* pTangent, UINT32* pPressure,
        //                              BOOL* pFound, double Dist, Path* pPath);
        virtual BOOL NewPoint(PathVerb Verb, DocCoord* pCoord);
        BOOL NewPointA(PathVerb Verb, DocCoord* pCoord, UINT32* pPressure = NULL);
        
        // the cached version of process
        INT32   Process(const ProcessFlags& PFlags, INT32 AlreadyProcessed);
    private:
        double   DesiredDist;
        double   CurrentDist;
        double   TangentAtDist;
        DocCoord CoordAtDist;
        UINT32   PressureAtDist;
        BOOL     Found;
        DocCoord PrevCoord;
        UINT32     m_PrevPressure;

        // members used to cache previous results
        INT32    m_LastFoundIndex;
        BOOL     m_bDrawingBrush;
        double   m_LastFoundDistance;

};

#endif

---