//----------------------------------------------------------------------------
//  EgalTech 2020-2020
//----------------------------------------------------------------------------
// File : DistLineLine.h      Data : 06.11.20         Versione : 2.2k1
// Contenuto : Dichiarazione della classe distanza fra elementi lineari.
//
//
//
// Modifiche : 06.11.20 LM Creazione modulo.
//
//
//----------------------------------------------------------------------------

#pragma once

#include "/EgtDev/Include/EGkVector3d.h"
#include "/EgtDev/Include/EGkPoint3d.h"

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

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

   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 ;
      double  m_dDist ;
      double  m_dPos1 ;
      double  m_dPos2 ;
      Point3d m_ptMinDist1 ;
      Point3d m_ptMinDist2 ;
} ;