//----------------------------------------------------------------------------
//  EgalTech 2020-2024
//----------------------------------------------------------------------------
// File : EGkDistLineLine.h      Data : 10.05.24         Versione : 2.6e31
// Contenuto : Dichiarazione della classe distanza fra elementi lineari.
//
//
//
// Modifiche : 06.11.20 LM Creazione modulo.
//             10.05.24 DS Portata in Include.
//
//----------------------------------------------------------------------------

#pragma once

#include "/EgtDev/Include/EGkPoint3d.h"

//----------------------- Macro per import/export ----------------------------
#undef EGK_EXPORT
#if defined( I_AM_EGK)            // da definirsi solo nella DLL
   #define EGK_EXPORT __declspec( dllexport)
#else
   #define EGK_EXPORT __declspec( dllimport)
#endif

//----------------------------------------------------------------------------
class DistLineLine
{
   public :
      EGK_EXPORT DistLineLine( const Point3d& ptSt1, const Point3d& ptEn1,
                               const Point3d& ptSt2, const Point3d& ptEn2,
                               bool bIsSegment1 = true, bool bIsSegment2 = true) ;
      EGK_EXPORT DistLineLine( const Point3d& ptSt1, const Vector3d& vtD1, double dLen1,
                               const Point3d& ptSt2, const Vector3d& vtD2, double dLen2,
                               bool bIsSegment1 = true, bool bIsSegment2 = true) ;

   public :
      EGK_EXPORT bool GetSqDist( double& dSqDist) const ;
      EGK_EXPORT bool GetDist( double& dDist) const ;
      EGK_EXPORT bool IsEpsilon( double dTol) const
                         { double dSqDist ; return ( GetSqDist( dSqDist)  &&  ( dSqDist < SQ_EPS_ZERO  ||  dSqDist < dTol * dTol)) ; }
      EGK_EXPORT bool IsSmall( void) const
                         { return IsEpsilon( EPS_SMALL) ; }
      EGK_EXPORT bool IsZero( void) const
                         { return IsEpsilon( EPS_ZERO) ;  }
      EGK_EXPORT bool GetMinDistPoints( Point3d& ptMinDist1, Point3d& ptMinDist2) const ;
      EGK_EXPORT bool GetPositionsAtMinDistPoints( double& dPos1, double& dPos2) const ;

   private :
      void Calculate( const Point3d& ptSt1, const Vector3d& vtD1, double dLen1,
                      const Point3d& ptSt2, const Vector3d& vtD2, double dLen2,
                      bool bIsSegment1, bool bIsSegment2) ;
   private:
      double  m_dSqDist ;
      mutable double  m_dDist ;
      double  m_dPos1 ;
      double  m_dPos2 ;
      Point3d m_ptMinDist1 ;
      Point3d m_ptMinDist2 ;
} ;