//----------------------------------------------------------------------------
//  EgalTech 2018-2020
//----------------------------------------------------------------------------
// File : DistPointSurfTm.cpp     Data : 19.12.20        Versione : 2.2l3
// Contenuto : Implementazione della classe distanza Punto da Trimesh.
//
//
//
// Modifiche : 07.12.18 LM Creazione modulo.
//
//
//----------------------------------------------------------------------------

#include "stdafx.h"
#include "SurfFlatRegion.h"
#include "/EgtDev/Include/EGkDistPointCurve.h"
#include "/EgtDev/Include/EGkDistPointSurfFr.h"

using namespace std ;

//----------------------------------------------------------------------------
DistPointSurfFr::DistPointSurfFr( const Point3d& ptP, const ISurfFlatRegion& frSurf)
   : m_dDist( -1)
{
  // FlatRegion non valida 
   if ( &frSurf == nullptr  ||  ! frSurf.IsValid())
      return ;
  // Calcolo la distanza
   Calculate( ptP, frSurf) ;
}

//----------------------------------------------------------------------------
void 
DistPointSurfFr::Calculate( const Point3d& ptP, const ISurfFlatRegion& frSurf)
{
  // Inizializzo distanza non calcolata
   m_dDist = -1 ;

  // Converto regione in classe base
   const SurfFlatRegion* pSfr = GetBasicSurfFlatRegion( &frSurf) ;
   if ( pSfr == nullptr)
      return ;

  // ciclo sulle parti della regione
   for ( int nC = 0 ; nC < pSfr->GetChunkCount() ; nC ++) {
      // ciclo sui loop della parte di regione
      for ( int nL = 0 ; nL < pSfr->GetLoopCount( nC) ; nL ++) {
         PtrOwner<ICurve> pLoop( pSfr->GetLoop( nC, nL)) ;
         if ( IsNull( pLoop)) {
            m_dDist = -1 ;
            return ;
         }
         DistPointCurve DPL( ptP, *pLoop) ;
         double dDist ;
         if ( DPL.GetDist( dDist)  &&  ( m_dDist < -EPS_SMALL  ||  dDist < m_dDist)) {
            m_dDist = dDist ;
            int nFlag ;
            m_nMinChunk = nC ;
            m_nMinLoop = nL ;
            DPL.GetParamAtMinDistPoint( 0, m_dMinPar, nFlag) ;
            DPL.GetMinDistPoint( 0, m_ptMinDistPoint, nFlag) ;
            DPL.GetSideAtMinDistPoint( 0, pSfr->GetNormVersor(), m_nSide) ;
         } 
      }
   }
  // se trovata, aggiorno minima distanza sul piano
   if ( m_dDist > - EPS_SMALL) {
      Point3d ptOn = ptP - ( ptP - pSfr->GetPlanePoint()) * pSfr->GetNormVersor() * pSfr->GetNormVersor() ;
      m_dDistOnPlane = min( Dist( ptOn, m_ptMinDistPoint), m_dDist) ;
   }
}

//----------------------------------------------------------------------------
bool
DistPointSurfFr::GetDist( double& dDist) const
{
   if ( m_dDist < 0)
      return false ;
   dDist = m_dDist ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointSurfFr::GetDistOnRegionPlane( double& dDist) const
{
   if ( m_dDist < 0)
      return false ;
   dDist = m_dDistOnPlane ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointSurfFr::GetPointAtMinDist( Point3d& ptMinDist) const
{
   if ( m_dDist < 0)
      return false ;
   ptMinDist = m_ptMinDistPoint ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointSurfFr::GetParamAtMinDist( int& nMinChunk, int& nMinLoop, double& dMinPar) const
{
   if ( m_dDist < 0)
      return false ;
   nMinChunk = m_nMinChunk ;
   nMinLoop = m_nMinLoop ;
   dMinPar = m_dMinPar ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointSurfFr::GetSideAtMinDist( int& nSide) const
{
   if ( m_dDist < 0)
      return false ;
   nSide = m_nSide ;
   return true ;
}

//----------------------------------------------------------------------------
bool
IsPointInsideSurfFr( const Point3d& ptP, const ISurfFlatRegion* pSfr, double dMinDist, bool& bInside, int& nChunk)
{
  // default non include
   bInside = false ;
   nChunk = -1 ;
  // verifica regione
   if ( pSfr == nullptr  ||  ! pSfr->IsValid())
      return false ;
  // verifico se la proiezione del punto sul piano della regione sta nel suo box
   Point3d ptOn = ptP - ( ptP - pSfr->GetPlanePoint()) * pSfr->GetNormVersor() * pSfr->GetNormVersor() ;
   BBox3d b3Box ;
   pSfr->GetLocalBBox( b3Box) ;
   b3Box.Expand( dMinDist) ;
   if ( ! b3Box.Encloses( ptOn))
      return true ;
  // determino dove sta il punto
   DistPointSurfFr DPR( ptP, *pSfr) ;
   double dDist ; int nMinCh, nMinL; double dMinPar ; int nSide ;
   if ( DPR.GetDistOnRegionPlane( dDist)  &&  DPR.GetParamAtMinDist( nMinCh, nMinL, dMinPar)  &&  DPR.GetSideAtMinDist( nSide)) {
      if ( abs( dMinDist) < EPS_SMALL)
         bInside = ( nSide != PRS_OUT) ;
      else if ( dMinDist < 0)
         bInside = ( nSide == PRS_IN  &&  dDist > abs( dMinDist) - EPS_SMALL) ;
      else
         bInside = ( nSide != PRS_OUT  ||  dDist < dMinDist + EPS_SMALL) ;
      if ( bInside)
         nChunk = nMinCh ;
   }
   return true ;
}