EgtGeomKernel/DistPointArc.cpp

//----------------------------------------------------------------------------
//  EgalTech 2013-2014
//----------------------------------------------------------------------------
// File : DistPointArc.cpp       Data : 13.01.14          Versione : 1.5a3
// Contenuto : Implementazione della classe distanza punto da circonferenza/arco.
//
//
//
// Modifiche : 28.12.13 DS Creazione modulo.
//             13.01.14 DS Implementata gestione elica.
//
//----------------------------------------------------------------------------

//--------------------------- Include ----------------------------------------
#include "stdafx.h"
#include "DistPointArc.h"
#include "DistPointCrvAux.h"
#include "GeoConst.h"


//----------------------------------------------------------------------------
DistPointArc::DistPointArc( const Point3d& ptP, const ICurveArc& arArc)
{
  // distanza non calcolata
   m_dDist = - 1 ;

   if ( &arArc == nullptr  ||  ! arArc.IsValid())
      return ;

  // se circonferenza
   if ( arArc.IsACircle())
      DistPointCircle( ptP, arArc) ; 

  // se arco in un piano
   else if ( arArc.IsFlat())
      DistPointFlatArc( ptP, arArc) ; 

  // altrimenti caso generico
   else
      DistPointHelix( ptP, arArc) ; 
}

//----------------------------------------------------------------------------
void
DistPointArc::DistPointCircle( const Point3d& ptP, const ICurveArc& arArc)
{
  // se il punto non sta sul centro dell'arco, posso calcolarne la posizione angolare
   double dAngDeg ;
   if ( arArc.CalcPointAngle( ptP, dAngDeg)) {
      double dParam = dAngDeg / arArc.GetAngCenter() ;
      if ( dParam < 0)
         dParam = 0 ;
      else if ( dParam > 1)
         dParam = 1 ;
     // calcolo del punto di minima distanza
      Point3d ptMinDist ;
      arArc.GetPointD1D2( dParam, ICurve::FROM_MINUS, ptMinDist) ;
     // calcolo del valore di minima distanza
      m_dDist = Dist( ptP, ptMinDist) ;
     // salvo i dati
      m_Info.push_back( MinDistPCInfo( MDPCI_NORMAL, dParam, ptMinDist)) ;
   }
  // altrimenti tutti i punti della circonferenza sono a minima distanza
   else {
     // calcolo del valore di minima distanza
      m_dDist = sqrt( SqDist( ptP, arArc.GetCenter()) + arArc.GetRadius() * arArc.GetRadius()) ;
     // salvo iniziale e finale, come estremi del range
      Point3d ptMinDist ;
      arArc.GetStartPoint( ptMinDist) ;
      m_Info.push_back( MinDistPCInfo( MDPCI_START_CONT, 0, ptMinDist)) ;
      arArc.GetEndPoint( ptMinDist) ;
      m_Info.push_back( MinDistPCInfo( MDPCI_END_CONT, 1, ptMinDist)) ;
   }
}

//----------------------------------------------------------------------------
void
DistPointArc::DistPointFlatArc( const Point3d& ptP, const ICurveArc& arArc)
{
  // calcolo come per il cerchio (ma angolo al centro corretto)
   DistPointCircle( ptP, arArc) ;

  // se non tutti i punti e il parametro è sui bordi, li verifico entrambi
   if ( m_Info[0].nFlag != MDPCI_START_CONT  &&
        ( fabs( m_Info[0].dPar) < EPS_ZERO  ||  fabs( m_Info[0].dPar - 1) < EPS_ZERO)) {
      for ( int i = 0 ; i <= 1 ; i ++) {
        // eseguo il calcolo
         double dU = i ;
         Point3d ptTest ;
         arArc.GetPointD1D2( dU, ICurve::FROM_MINUS, ptTest) ;
         double dDist = Dist( ptP, ptTest) ;
        // altro punto con la stessa minima distanza
         if ( i == 1  &&  fabs( dDist - m_dDist) < EPS_SMALL) {
           // lo aggiungo
            m_Info.push_back( MinDistPCInfo( MDPCI_NORMAL, dU, ptTest)) ;
         }
        // primo punto o punto con minima distanza più bassa
         else if ( i == 0  ||  dDist < m_dDist) {
           // aggiorno i minimi
            m_dDist = dDist ;
           // il nuovo vettore deve contenere solo quest'ultimo minimo
            m_Info.clear() ;
            m_Info.push_back( MinDistPCInfo( MDPCI_NORMAL, dU, ptTest)) ; 
         }
      }
   }
}

//----------------------------------------------------------------------------
void
DistPointArc::DistPointHelix( const Point3d& ptP, const ICurveArc& arArc)
{
  // determino tolleranza di approssimazione in base a raggio curva
   double dRad = arArc.GetRadius() ;
   const double FRAZ = 0.2 ;
   double dLinTol = ( ( FRAZ * dRad > LIN_TOL_APPROX) ? LIN_TOL_APPROX : FRAZ * dRad) ;

  // creo una polilinea di approssimazione
   PolyLine PL ;
   if ( ! arArc.ApproxWithLines( dLinTol, ANG_TOL_APPROX_DEG, PL))
      return ;

  // cerco la minima distanza per la polilinea
   MDCVECTOR vApproxMin ;
   MDCVECTOR::iterator Iter ;
   if ( ! CalcMinDistPointPolyLine( ptP, PL, dLinTol, vApproxMin))
      return ;

  // raffino i punti trovati
   double dPolishedPar ;
   Point3d ptPolishedQ ;
   for ( Iter = vApproxMin.begin() ; Iter != vApproxMin.end() ; ++Iter) {
     // eseguo raffinamento
      if ( PolishMinDistPointCurve( ptP, arArc, *Iter, dPolishedPar, ptPolishedQ)) {
         (*Iter).dDist = Dist( ptP, ptPolishedQ) ;
         (*Iter).dPar = dPolishedPar ;
         (*Iter).ptQ = ptPolishedQ ;
      }
      else
         (*Iter).dDist = INFINITO ;
   }

  // determino i minimi raffinati da tenere
   double dMinDist ;
   if ( FilterMinDistPointCurve( ptP, arArc, vApproxMin, dMinDist, m_Info))
      m_dDist = dMinDist ;
}

//----------------------------------------------------------------------------
bool
DistPointArc::GetSqDist( double& dSqDist)
{
   if ( m_dDist < 0)
      return false ;

   dSqDist = m_dDist * m_dDist ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointArc::GetDist( double& dDist)
{
   if ( m_dDist < 0)
      return false ;

   dDist = m_dDist ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointArc::GetMinDistPoint( int nInd, Point3d& ptMinDist, int& nFlag)
{
   if ( m_dDist < 0)
      return false ;

   if ( nInd < 0  ||  nInd >= (int) m_Info.size())
      return false ;

   ptMinDist = m_Info[nInd].ptQ ;
   nFlag = m_Info[nInd].nFlag ;
   return true ;
}

//----------------------------------------------------------------------------
bool
DistPointArc::GetParamAtMinDistPoint( int nInd, double& dParam, int& nFlag)
{
   if ( m_dDist < 0)
      return false ;

   if ( nInd < 0  ||  nInd >= (int) m_Info.size())
      return false ;

   dParam = m_Info[nInd].dPar ;
   nFlag = m_Info[nInd].nFlag ;
   return true ;
}