//----------------------------------------------------------------------------
//  EgalTech 2017-2017
//----------------------------------------------------------------------------
// File : RemoveCurveSpikes.cpp     Data : 02.10.17      Versione : 1.8j1
// Contenuto : Implementazione rimozione spikes di curva.
//
//
//
// Modifiche : 02.10.17 DS Creazione modulo.
//
//
//----------------------------------------------------------------------------

//--------------------------- Include ----------------------------------------
#include "stdafx.h"
#include "GeoConst.h"
#include "CurveComposite.h"
#include "DistPointLine.h"
#include "RemoveCurveSpikes.h"
#include <algorithm>

using namespace std ;

//----------------------------------------------------------------------------
bool
RemoveCurveSpikes( ICurveComposite* pCurve)
{
  // verifico validità curva
   if ( pCurve == nullptr)
      return false ;
  // recupero il numero di curve semplici componenti la composta
   int nCrvCount = pCurve->GetCurveCount() ;
   if ( nCrvCount < 2  ||  ( nCrvCount < 3  &&  pCurve->IsClosed()))
      return true ;
  // ciclo sulle curve elementari della composita
   int nStart = pCurve->IsClosed() ? 0 : 1 ;
   for ( int i = nStart ; i < nCrvCount ; ++ i) {
     // recupero due curve consecutive
      const ICurve* pPrevCrv = pCurve->GetCurve( ( i > 0 ? i - 1 : nCrvCount - 1)) ;
      const ICurve* pNextCrv = pCurve->GetCurve( i) ;
     // se sono entrambe rette
      if ( pPrevCrv->GetType() == CRV_LINE  &&  pNextCrv->GetType() == CRV_LINE) {
        // recupero i punti estremi
         Point3d ptStart ; pPrevCrv->GetStartPoint( ptStart) ;
         Point3d ptMid ; pPrevCrv->GetEndPoint( ptMid) ;
         Point3d ptEnd ; pNextCrv->GetEndPoint( ptEnd) ;
        // recupero le direzioni negli estremi
         Vector3d vtPrev ; pPrevCrv->GetStartDir( vtPrev) ;
         Vector3d vtNext ; pNextCrv->GetStartDir( vtNext) ;
        // verifico se spike
         double dPrevDist, dNextDist ;
         if ( vtPrev * vtNext < cos( 175 * DEGTORAD)  &&  
              (( DistPointLine( ptStart, ptMid, ptEnd).GetDist( dPrevDist)  &&  dPrevDist < EPS_SMALL)  ||
               ( DistPointLine( ptEnd, ptStart, ptMid).GetDist( dNextDist)  &&  dNextDist < EPS_SMALL))) {
           // se spike ha base abbastanza larga, basta togliere uno dei due lati
            if ( SqDist( ptStart, ptEnd) > SQ_EPS_SMALL) {
               pCurve->RemoveJoint( i) ;
               -- nCrvCount ;
               -- i ;
            }
           // altrimenti bisogna togliere entrambi
            else {
               pCurve->RemoveJoint( i - 1) ;
               pCurve->RemoveJoint( i) ;
               nCrvCount -= 2 ;
               i = max( i - 2, nStart - 1) ;
            }
         }
      }
     // !!! Aggiungere la gestione degli altri tipi di curve !!!
   }

   return true ;
}