posidxpair2coord.h

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#pragma once

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Bert
 Date:          Oct 2013
________________________________________________________________________

-*/

#include "basicmod.h"
#include "posidxpair.h"
#include "coord.h"


namespace Pos
{


mExpClass(Basic) IdxPair2Coord
{
public:

    typedef IdxPair::IdxType IdxType;

                        IdxPair2Coord()         {}

    bool                operator==(const IdxPair2Coord&) const;
    bool                isSubsetOf(const IdxPair2Coord&) const;
    bool                isValid() const         { return xtr.valid(ytr); }
    Coord               firstDir() const        { return Coord(xtr.b,ytr.b); }
    Coord               secondDir() const       { return Coord(xtr.c,ytr.c); }

    Coord               transform(const IdxPair&) const;
    IdxPair             transformBack(const Coord&) const;
    IdxPair             transformBack(const Coord&,const IdxPair& start,
                                        const IdxPairStep&) const;
    Coord               transformBackNoSnap(const Coord&) const;
    Coord               transform(const Coord& rc) const;
    bool                set3Pts(const Coord& c0,const Coord& c1,const Coord& c2,
                                const IdxPair& rc0,const IdxPair& rc1,
                                od_int32 col2 );
    struct DirTransform
    {
                        DirTransform()  { a = b = c = 0; }

        inline double   det( const DirTransform& bct ) const
                        { return b * bct.c - bct.b * c; }
        inline bool     valid( const DirTransform& bct ) const
                        { double d = det( bct ); return !mIsZero(d,mDefEps); }

        double          a, b, c;
    };

    void                setTransforms(  const DirTransform& x,
                                        const DirTransform& y )
                        { xtr = x; ytr = y; }
    const DirTransform& getTransform( bool x ) const
                        { return x ? xtr : ytr; }

    // aliases

    inline Coord        rowDir() const  { return firstDir(); }
    inline Coord        colDir() const  { return secondDir(); }
    inline Coord        inlDir() const  { return firstDir(); }
    inline Coord        crlDir() const  { return secondDir(); }

    void                fillPar(IOPar&) const;
    void                usePar(const IOPar&);
    static int          sizeInBuf()     { return 6*sizeof(double); }
    void                fillBuf(void*) const;
    void                useBuf(const void*);

protected:

    DirTransform        xtr;
    DirTransform        ytr;

    bool                isNodeOn(const Pos::IdxPair2Coord&,int,int) const;

};


} // namespace Pos