GQ/GQ_Face.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      David Wong
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        Quad Edge Library (C++)
 *
 * COMMENTS:    Code for a quad edge face
 *
 */

#ifndef _GQ_Face_h_
#define _GQ_Face_h_

#include "GQ_API.h"
class GQ_Edge;
class GQ_Point;
class GEO_PrimPoly;
class GEO_Point;

class GQ_API GQ_Face {
public:
    explicit             GQ_Face(GEO_PrimPoly *p)
                         {
                            myPoly = p;
                            myEdge = 0;
                            mySpare = 0;
                            myNormal = 0;
                            myFlags = 0;
                            myGQpt = 0;
                         }
                        ~GQ_Face()               { delete myNormal; }
    GEO_PrimPoly        *getPoly() const        { return myPoly; }
    void                 setPoly(GEO_PrimPoly *p) { myPoly = p; }

    // Assume no intersection of edges with plane 
    int                  aboveOrBelow(UT_Vector3 &normal, float distance);

    void                 setEdge(GQ_Edge *e)    { myEdge = e; }
    void                 adjustToSafeEdge();
    GQ_Edge             *getEdge() const        { return myEdge; }
    int                  getNumEdges() const;

    void                 setFlags(unsigned mask)        { myFlags = mask; }
    unsigned             getFlags(unsigned mask=~0) const
                                                      { return myFlags & mask; }
    void                 addFlags(unsigned mask)        { myFlags |= mask; }
    void                 clearFlags(unsigned mask=~0)   { myFlags &= ~mask; }

    // Face point operators, face points are temporarily created:
    void                 setGQPoint(GQ_Point *pt)       { myGQpt = pt; }
    GQ_Point            *getGQPoint() const     { return myGQpt; }
    GEO_Point           *getPoint() const;

    // Public data use it with care please
    void                *mySpare;
    UT_Vector3          *myNormal;
    int                  myIndex;

private:

    GEO_PrimPoly        *myPoly;
    GQ_Point            *myGQpt;
    GQ_Edge             *myEdge;       // an edge that share this face on left() 
    unsigned             myFlags;
};
#endif

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