polygonsurface.h

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#pragma once
                                                                                
/*+
________________________________________________________________________
(C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
Author:        Y.C. Liu
Date:          July 2008
________________________________________________________________________

-*/

#include "geometrymod.h"
#include "refcount.h"
#include "rowcolsurface.h"

namespace Geometry
{
/*<!Simple geometry for polygonsurface, for polygon plane, only three 
    directions are defined, i.e. along XY, XZ or YZ planes. So normals are 
    given by Coord3(0,0,1), Coord3(0,1,0) and Coord3(1,0,0) respectively.
    For Rcol variable rc, rc.r() represents polygonidx, rc.c() represents the 
    knots on the corresponding polygon. */
 
mExpClass(Geometry) PolygonSurface : public RowColSurface
{
public:
                        PolygonSurface();
                        ~PolygonSurface();
    bool                isEmpty() const         { return !polygons_.size(); }
    Element*            clone() const;
    enum ChangeTag      {PolygonChange=__mUndefIntVal+1,PolygonInsert,
                         PolygonRemove};

    bool                insertPolygon(const Coord3& firstpos,
                                      const Coord3& normal,int polygon=0,
                                      int firstknot=0);
    bool                removePolygon(int polygon);

    bool                insertKnot(const RowCol&,const Coord3&);
    bool                removeKnot(const RowCol&);

    int                 nrPolygons() const { return polygons_.size(); }
    StepInterval<int>   rowRange() const;
    virtual StepInterval<int> colRange() const
                        { return RowColSurface::colRange(); }
    StepInterval<int>   colRange(int polygon) const;
    
    bool                setKnot(const RowCol&,const Coord3&);
    Coord3              getKnot(const RowCol&) const;
    bool                isKnotDefined(const RowCol&) const;

    void                setBezierCurveSmoothness(int nrpoints_on_segment);
    int                 getBezierCurveSmoothness() const {return beziernrpts_;}
    void                getCubicBezierCurve(int plg,TypeSet<Coord3>& pts,
                                            const float zscale) const;
                        /*<The Bezier Curve smoothes the polygon, nrknotsinsert
                           on each edge will affect the smoothness. */
    void                getAllKnots(TypeSet<Coord3>&) const;
                        /*<Only get all the picked positions on the surface. */

    Coord3              getPolygonNormal(int polygonnr) const;
    Coord3              getPolygonConcaveDir(int polygonnr) const;

    void                getExceptionEdges(int plg,TypeSet<int>& edges) const;   
    void                getPolygonConcaveTriangles(int plg,TypeSet<int>&) const;
                        /*<the TypeSet has all the triangles which are concave 
                        relative to the polygon. ret v0, v1, v2 the 1st 
                        triangle; v3, v4, v5 the 2nd. */

    void                addUdfPolygon(int polygnr,int firstknotnr,int nrknots);
    void                addEditPlaneNormal(const Coord3& normal);

    char                bodyDimension() const;
                        /*<Return dim==3, it is a real body, otherwise, 
                           dim==2 a surface, dim==1 a line, dim==0 a point.*/

protected:

    bool                        linesegmentsIntersecting(const Coord3& v0, 
                                        const Coord3& v1,const Coord3& p0,
                                        const Coord3& p1) const;
    bool                        includesEdge(const TypeSet<int> edges,
                                             int v0,int v1) const;
    int                         firstpolygon_;
    TypeSet<int>                firstknots_;
    ObjectSet<TypeSet<Coord3> > polygons_;
                                /*<assume each polygon is made by connecting 
                                   the pts in order. */
    TypeSet<Coord3>             polygonnormals_;
    TypeSet<Coord3>             concavedirs_;
    int                         beziernrpts_;
};

};