include/opencascade/HLRAlgo.hxx

0001 // Created on: 1992-02-18
0002 // Created by: Christophe MARION
0003 // Copyright (c) 1992-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _HLRAlgo_HeaderFile
0018 #define _HLRAlgo_HeaderFile
0019
0020 #include <HLRAlgo_WiresBlock.hxx>
0021
0022 //! In order to have the precision required in
0023 //! industrial design, drawings need to offer the
0024 //! possibility of removing lines, which are hidden
0025 //! in a given projection. To do this, the Hidden
0026 //! Line Removal component provides two
0027 //! algorithms: HLRBRep_Algo and HLRBRep_PolyAlgo.
0028 //! These algorithms remove or indicate lines
0029 //! hidden by surfaces. For a given projection, they
0030 //! calculate a set of lines characteristic of the
0031 //! object being represented. They are also used
0032 //! in conjunction with extraction utilities, which
0033 //! reconstruct a new, simplified shape from a
0034 //! selection of calculation results. This new shape
0035 //! is made up of edges, which represent the lines
0036 //! of the visualized shape in a plane. This plane is the projection plane.
0037 //! HLRBRep_Algo takes into account the shape
0038 //! itself. HLRBRep_PolyAlgo works with a
0039 //! polyhedral simplification of the shape. When
0040 //! you use HLRBRep_Algo, you obtain an exact
0041 //! result, whereas, when you use
0042 //! HLRBRep_PolyAlgo, you reduce computation
0043 //! time but obtain polygonal segments.
0044 class HLRAlgo
0045 {
0046 public:
0047   DEFINE_STANDARD_ALLOC
0048
0049   //! Iterator  on the  visible or  hidden  parts of  an
0050   //! EdgeStatus.
0051   Standard_EXPORT static void UpdateMinMax(const Standard_Real x,
0052                                            const Standard_Real y,
0053                                            const Standard_Real z,
0054                                            Standard_Real       Min[16],
0055                                            Standard_Real       Max[16]);
0056
0057   Standard_EXPORT static void EnlargeMinMax(const Standard_Real tol,
0058                                             Standard_Real       Min[16],
0059                                             Standard_Real       Max[16]);
0060
0061   Standard_EXPORT static void InitMinMax(const Standard_Real Big,
0062                                          Standard_Real       Min[16],
0063                                          Standard_Real       Max[16]);
0064
0065   Standard_EXPORT static void EncodeMinMax(HLRAlgo_EdgesBlock::MinMaxIndices& Min,
0066                                            HLRAlgo_EdgesBlock::MinMaxIndices& Max,
0067                                            HLRAlgo_EdgesBlock::MinMaxIndices& MinMax);
0068
0069   Standard_EXPORT static Standard_Real SizeBox(HLRAlgo_EdgesBlock::MinMaxIndices& Min,
0070                                                HLRAlgo_EdgesBlock::MinMaxIndices& Max);
0071
0072   Standard_EXPORT static void DecodeMinMax(const HLRAlgo_EdgesBlock::MinMaxIndices& MinMax,
0073                                            HLRAlgo_EdgesBlock::MinMaxIndices&       Min,
0074                                            HLRAlgo_EdgesBlock::MinMaxIndices&       Max);
0075
0076   static void CopyMinMax(HLRAlgo_EdgesBlock::MinMaxIndices& IMin,
0077                          HLRAlgo_EdgesBlock::MinMaxIndices& IMax,
0078                          HLRAlgo_EdgesBlock::MinMaxIndices& OMin,
0079                          HLRAlgo_EdgesBlock::MinMaxIndices& OMax)
0080   {
0081     OMin = IMin;
0082     OMax = IMax;
0083   }
0084
0085   Standard_EXPORT static void AddMinMax(HLRAlgo_EdgesBlock::MinMaxIndices& IMin,
0086                                         HLRAlgo_EdgesBlock::MinMaxIndices& IMax,
0087                                         HLRAlgo_EdgesBlock::MinMaxIndices& OMin,
0088                                         HLRAlgo_EdgesBlock::MinMaxIndices& OMax);
0089 };
0090
0091 #endif // _HLRAlgo_HeaderFile