OCCT

// Created on: 1995-12-21
// Created by: Jean Yves LEBEY
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <TopOpeBRepBuild_Area3dBuilder.hxx>
#include <TopOpeBRepBuild_Loop.hxx>
#include <TopOpeBRepBuild_LoopClassifier.hxx>
#include <TopOpeBRepBuild_LoopSet.hxx>

//=================================================================================================

TopOpeBRepBuild_Area3dBuilder::TopOpeBRepBuild_Area3dBuilder() = default;

//=================================================================================================

TopOpeBRepBuild_Area3dBuilder::TopOpeBRepBuild_Area3dBuilder(TopOpeBRepBuild_LoopSet&        LS,
                                                             TopOpeBRepBuild_LoopClassifier& LC,
                                                             const bool ForceClass)
{
  InitAreaBuilder(LS, LC, ForceClass);
}

//=================================================================================================

void TopOpeBRepBuild_Area3dBuilder::InitAreaBuilder(TopOpeBRepBuild_LoopSet&        LS,
                                                    TopOpeBRepBuild_LoopClassifier& LC,
                                                    const bool                      ForceClass)
{
  TopAbs_State state;
  bool         Loopinside;
  bool         loopoutside;

  NCollection_List<NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>>::Iterator AreaIter;
  NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>::Iterator                   LoopIter;
  // boundaryloops : list of boundary loops out of the areas.
  NCollection_List<occ::handle<TopOpeBRepBuild_Loop>> boundaryloops;

  myArea.Clear(); // Clear the list of Area to be built

  for (LS.InitLoop(); LS.MoreLoop(); LS.NextLoop())
  {

    // process a new loop : L is the new current Loop
    const occ::handle<TopOpeBRepBuild_Loop>& L         = LS.Loop();
    bool                                     boundaryL = L->IsShape();

    // L = shape et ForceClass  : on traite L comme un block
    // L = shape et !ForceClass : on traite L comme un pur shape
    // L = !shape               : on traite L comme un block
    bool traitercommeblock = (!boundaryL) || ForceClass;
    if (!traitercommeblock)
    {

      // the loop L is a boundary loop :
      // - try to insert it in an existing area, such as L is inside all
      //   the block loops. Only block loops of the area are compared.
      // - if L could not be inserted, store it in list of boundary loops.

      Loopinside = false;
      for (AreaIter.Initialize(myArea); AreaIter.More(); AreaIter.Next())
      {
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>& aArea = AreaIter.ChangeValue();
        if (aArea.IsEmpty())
        {
          continue;
        }
        state = CompareLoopWithListOfLoop(LC, L, aArea, TopOpeBRepBuild_BLOCK);
        if (state == TopAbs_UNKNOWN)
        {
          Atomize(state, TopAbs_IN);
        }
        Loopinside = (state == TopAbs_IN);
        if (Loopinside)
        {
          break;
        }
      } // end of Area scan

      if (Loopinside)
      {
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>& aArea = AreaIter.ChangeValue();
        ADD_Loop_TO_LISTOFLoop(L, aArea, (void*)("IN, to current area"));
      }
      else if (!Loopinside)
      {
        ADD_Loop_TO_LISTOFLoop(L, boundaryloops, (void*)("! IN, to boundaryloops"));
      }

    } // end of boundary loop

    else
    {
      // the loop L is a block loop
      // if L is IN theArea :
      //   - stop area scan, insert L in theArea.
      //   - remove from the area all the loops outside L
      //   - make a new area with them, unless they are all boundary
      //   - if they are all boundary put them back in boundaryLoops
      // else :
      //   - create a new area with L.
      //   - insert boundary loops that are IN the new area
      //     (and remove them from 'boundaryloops')

      Loopinside = false;
      for (AreaIter.Initialize(myArea); AreaIter.More(); AreaIter.Next())
      {
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>& aArea = AreaIter.ChangeValue();
        if (aArea.IsEmpty())
        {
          continue;
        }
        state = CompareLoopWithListOfLoop(LC, L, aArea, TopOpeBRepBuild_ANYLOOP);
        if (state == TopAbs_UNKNOWN)
        {
          Atomize(state, TopAbs_IN);
        }
        Loopinside = (state == TopAbs_IN);
        if (Loopinside)
        {
          break;
        }
      } // end of Area scan

      if (Loopinside)
      {
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>& aArea    = AreaIter.ChangeValue();
        bool                                                 allShape = true;
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>  removedLoops;
        LoopIter.Initialize(aArea);
        while (LoopIter.More())
        {
          const occ::handle<TopOpeBRepBuild_Loop>& LLI1 = LoopIter.Value();
          state                                         = LC.Compare(LLI1, L);
          if (state == TopAbs_UNKNOWN)
          {
            Atomize(state, TopAbs_IN); // not OUT
          }
          loopoutside = (state == TopAbs_OUT);
          if (loopoutside)
          {
            const occ::handle<TopOpeBRepBuild_Loop>& curL = LoopIter.Value();
            // remove the loop from the area
            ADD_Loop_TO_LISTOFLoop(curL,
                                   removedLoops,
                                   (void*)("loopoutside = 1, area = removedLoops"));

            allShape = allShape && curL->IsShape();
            REM_Loop_FROM_LISTOFLoop(LoopIter,
                                     AreaIter.ChangeValue(),
                                     (void*)("loop of cur. area, cur. area"));
          }
          else
          {
            LoopIter.Next();
          }
        }
        // insert the loop in the area
        ADD_Loop_TO_LISTOFLoop(L, aArea, (void*)("area = current"));
        if (!removedLoops.IsEmpty())
        {
          if (allShape)
          {
            ADD_LISTOFLoop_TO_LISTOFLoop(removedLoops,
                                         boundaryloops,
                                         (void*)("allShape = 1"),
                                         (void*)("removedLoops"),
                                         (void*)("boundaryloops"));
          }
          else
          {
            // make a new area with the removed loops
            NCollection_List<occ::handle<TopOpeBRepBuild_Loop>> thelist;
            myArea.Append(thelist);
            ADD_LISTOFLoop_TO_LISTOFLoop(removedLoops,
                                         myArea.Last(),
                                         (void*)("allShape = 0"),
                                         (void*)("removedLoops"),
                                         (void*)("new area"));
          }
        }
      } // Loopinside == True

      else
      {
        int                                                 ashapeinside, ablockinside;
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>> thelist1;
        myArea.Append(thelist1);
        NCollection_List<occ::handle<TopOpeBRepBuild_Loop>>& newArea0 = myArea.Last();
        ADD_Loop_TO_LISTOFLoop(L, newArea0, (void*)("new area"));

        LoopIter.Initialize(boundaryloops);
        while (LoopIter.More())
        {
          ashapeinside = ablockinside                   = false;
          const occ::handle<TopOpeBRepBuild_Loop>& LLI2 = LoopIter.Value();
          state                                         = LC.Compare(LLI2, L);
          if (state == TopAbs_UNKNOWN)
          {
            Atomize(state, TopAbs_IN);
          }
          ashapeinside = (state == TopAbs_IN);
          if (ashapeinside)
          {
            const occ::handle<TopOpeBRepBuild_Loop>& LLI3 = LoopIter.Value();
            state                                         = LC.Compare(L, LLI3);
            if (state == TopAbs_UNKNOWN)
            {
              Atomize(state, TopAbs_IN);
            }
            ablockinside = (state == TopAbs_IN);
          }
          if (ashapeinside && ablockinside)
          {
            const occ::handle<TopOpeBRepBuild_Loop>& curL = LoopIter.Value();
            ADD_Loop_TO_LISTOFLoop(curL,
                                   newArea0,
                                   (void*)("ashapeinside && ablockinside, new area"));

            REM_Loop_FROM_LISTOFLoop(LoopIter,
                                     boundaryloops,
                                     (void*)("loop of boundaryloops, boundaryloops"));
          }
          else
          {
            LoopIter.Next();
          }
        } // end of boundaryloops scan
      } // Loopinside == False
    } // end of block loop
  } // end of LoopSet LS scan

  InitArea();
}