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42cf5bc1 | 1 | // Created on: 1993-07-22 |

2 | // Created by: Isabelle GRIGNON | |

3 | // Copyright (c) 1993-1999 Matra Datavision | |

4 | // Copyright (c) 1999-2014 OPEN CASCADE SAS | |

5 | // | |

6 | // This file is part of Open CASCADE Technology software library. | |

7 | // | |

8 | // This library is free software; you can redistribute it and/or modify it under | |

9 | // the terms of the GNU Lesser General Public License version 2.1 as published | |

10 | // by the Free Software Foundation, with special exception defined in the file | |

11 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT | |

12 | // distribution for complete text of the license and disclaimer of any warranty. | |

13 | // | |

14 | // Alternatively, this file may be used under the terms of Open CASCADE | |

15 | // commercial license or contractual agreement. | |

16 | ||

17 | #ifndef _BRepBndLib_HeaderFile | |

18 | #define _BRepBndLib_HeaderFile | |

19 | ||

20 | #include <Standard.hxx> | |

21 | #include <Standard_DefineAlloc.hxx> | |

22 | #include <Standard_Handle.hxx> | |

23 | ||

24 | #include <Standard_Boolean.hxx> | |

25 | class TopoDS_Shape; | |

26 | class Bnd_Box; | |

1a0339b4 | 27 | class Bnd_OBB; |

42cf5bc1 | 28 | |

29 | ||

30 | //! This package provides the bounding boxes for curves | |

31 | //! and surfaces from BRepAdaptor. | |

32 | //! Functions to add a topological shape to a bounding box | |

33 | class BRepBndLib | |

34 | { | |

35 | public: | |

36 | ||

37 | DEFINE_STANDARD_ALLOC | |

38 | ||

39 | ||

40 | //! Adds the shape S to the bounding box B. | |

41 | //! More precisely are successively added to B: | |

42 | //! - each face of S; the triangulation of the face is used if it exists, | |

43 | //! - then each edge of S which does not belong to a face, | |

44 | //! the polygon of the edge is used if it exists | |

45 | //! - and last each vertex of S which does not belong to an edge. | |

46 | //! After each elementary operation, the bounding box B is | |

47 | //! enlarged by the tolerance value of the relative sub-shape. | |

48 | //! When working with the triangulation of a face this value of | |

49 | //! enlargement is the sum of the triangulation deflection and | |

50 | //! the face tolerance. When working with the | |

51 | //! polygon of an edge this value of enlargement is | |

52 | //! the sum of the polygon deflection and the edge tolerance. | |

53 | //! Warning | |

54 | //! - This algorithm is time consuming if triangulation has not | |

55 | //! been inserted inside the data structure of the shape S. | |

56 | //! - The resulting bounding box may be somewhat larger than the object. | |

57 | Standard_EXPORT static void Add (const TopoDS_Shape& S, Bnd_Box& B, const Standard_Boolean useTriangulation = Standard_True); | |

58 | ||

59 | //! Adds the shape S to the bounding box B. | |

60 | //! This is a quick algorithm but only works if the shape S is | |

61 | //! composed of polygonal planar faces, as is the case if S is | |

62 | //! an approached polyhedral representation of an exact | |

63 | //! shape. Pay particular attention to this because this | |

64 | //! condition is not checked and, if it not respected, an error | |

65 | //! may occur in the algorithm for which the bounding box is built. | |

66 | //! Note that the resulting bounding box is not enlarged by the | |

67 | //! tolerance value of the sub-shapes as is the case with the | |

68 | //! Add function. So the added part of the resulting bounding | |

69 | //! box is closer to the shape S. | |

70 | Standard_EXPORT static void AddClose (const TopoDS_Shape& S, Bnd_Box& B); | |

71 | ||

3ba87fdb | 72 | //! Adds the shape S to the bounding box B. |

73 | //! This algorith builds precise bounding box, | |

74 | //! which differs from exact geometry boundaries of shape only on shape entities tolerances | |

75 | //! Algorithm is the same as for method Add(..), but uses more precise methods for building boxes | |

76 | //! for geometry objects. | |

77 | //! If useShapeTolerance = True, bounding box is enlardged by shape tolerances and | |

78 | //! these tolerances are used for numerical methods of bounding box size calculations, | |

79 | //! otherwise bounding box is built according to sizes of uderlined geometrical entities, | |

80 | //! numerical calculation use tolerance Precision::Confusion(). | |

81 | Standard_EXPORT static void AddOptimal (const TopoDS_Shape& S, Bnd_Box& B, | |

82 | const Standard_Boolean useTriangulation = Standard_True, | |

83 | const Standard_Boolean useShapeTolerance = Standard_False); | |

42cf5bc1 | 84 | |

85 | ||

1a0339b4 | 86 | //! Computes the Oriented Bounding box for the shape <theS>. |

87 | //! Two independent methods of computation are implemented: | |

88 | //! first method based on set of points (so, it demands the | |

89 | //! triangulated shape or shape with planar faces and linear edges). | |

90 | //! The second method is based on use of inertia axes and is called | |

91 | //! if use of the first method is impossible. | |

92 | //! If theIsTriangulationUsed == FALSE then the triangulation will | |

93 | //! be ignored at all. | |

94 | //! If theIsShapeToleranceUsed == TRUE then resulting box will be | |

95 | //! extended on the tolerance of the shape. | |

96 | //! theIsOptimal flag defines the algorithm for construction of initial | |

97 | //! Bnd_Box for the second method (if theIsOptimal == TRUE then | |

98 | //! this box will be created by AddOptimal(...) method). | |

99 | Standard_EXPORT static | |

100 | void AddOBB(const TopoDS_Shape& theS, | |

101 | Bnd_OBB& theOBB, | |

102 | const Standard_Boolean theIsTriangulationUsed = Standard_True, | |

103 | const Standard_Boolean theIsOptimal = Standard_False, | |

104 | const Standard_Boolean theIsShapeToleranceUsed = Standard_True); | |

42cf5bc1 | 105 | |

106 | protected: | |

107 | ||

108 | ||

109 | ||

110 | ||

111 | ||

112 | private: | |

113 | ||

114 | ||

115 | ||

116 | ||

117 | ||

118 | }; | |

119 | ||

120 | ||

121 | ||

122 | ||

123 | ||

124 | ||

125 | ||

126 | #endif // _BRepBndLib_HeaderFile |