bevtrap.h

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// $Id: bevtrap.h 751 2006-03-31 15:43:49Z alex $
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               Xara LX, a vector drawing and manipulation program.
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 */
#ifndef _BEVTRAP_H
#define _BEVTRAP_H

#include "pathproc.h"
#include "pathtrap.h"


class CCreateBevelTrapezoids : public CCObject
{
    CC_DECLARE_DYNCREATE(CCreateBevelTrapezoids);

public:
    // creates the bevel trap list
    BOOL ProcessTrapsForBevelling(Path *pPath, TrapsList *RetnTraps, INT32 indent, JointType jType,
                            BOOL bOuter);

    // gives the inner point from a trap edge and puts it in dc
    static void CalcInnerPoint(TrapEdge * pEdge, INT32 indent, DocCoord * dc, BOOL bOuter);
    
#ifdef _DEBUG
    static void DumpList(TrapsList * pList);
#endif

    static BOOL CalculateIntersection(const DocCoord * start1, const NormCoord * dir1,
                                                   const DocCoord * start2, const NormCoord * dir2,
                                                   DocCoord * point, double * p, double * q);

    static void GetPathFromTraps(TrapsList * pTraps, const MILLIPOINT Width, Path * pPath);

    // elimintates the multiple points in the path
    static BOOL EliminateMultpilePoints(Path * pSrc, Path * pDest); 

    // calculates the intersection between two lines
private:

    // is this an outer turn on the path ?
    BOOL IsOuterTurn(NormCoord * nc1, NormCoord * nc2);

    // adds a given edge to the list
    BOOL AddEdgeToList(TrapEdgeList * pList, DocCoord * Centre, NormCoord * Normal, double Position,
                            NormCoord * pNormal2=NULL);

    // smooths off the corners (otherwise they come out as being jaggy
    BOOL SmoothCorners(TrapsList * pList, TrapsList * RetnList, double Indent, BOOL bOuterBevel);

    // offsets index by 'offset', with maximum value being max-1
    // used to circle around the paths
    INT32 AlterIndex(INT32 index, INT32 max, INT32 offset);

    // creates the traps from the path
    BOOL ProcessPath(Path * pPath, TrapsList *RetnTraps, INT32 indent, BOOL bOuter, JointType jType);

    // creates a round join (recursive)
    void CreateRoundJoin(TrapEdgeList * pList, DocCoord * pCentre, 
                                             NormCoord * pStartNorm, NormCoord * pEndNorm, 
                                             INT32 depth = 0);

    // makes sure all inner points are at a consistant distance from the original path
    // based on where the outer points are
    void FlattenInnerPoints(TrapEdgeList * pList, INT32 indent, BOOL bOuter);

    // adds edges between centre 1 and centre 2 with the same inner point
    void RecursivelyAddEdges(TrapEdgeList * pList, DocCoord * pCentre1, DocCoord * pCentre2,
                             DocCoord * pInnerPoint, double MOneDivIndent, INT32 depth = 0);

} ;

#endif

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