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7fd59977 | 1 | -- File: BRepBndLib.cdl |

2 | -- Created: Thu Jul 22 16:12:28 1993 | |

3 | -- Author: Isabelle GRIGNON | |

4 | -- <isg@nonox> | |

5 | ---Copyright: Matra Datavision 1993 | |

6 | ||

7 | ||

8 | package BRepBndLib | |

9 | ||

10 | ---Purpose: This package provides the bounding boxes for curves | |

11 | -- and surfaces from BRepAdaptor. | |

12 | -- Functions to add a topological shape to a bounding box | |

13 | uses BRepAdaptor, | |

14 | Bnd, | |

15 | TopoDS, | |

16 | Geom, | |

17 | GeomAbs, | |

18 | TColgp, | |

19 | gp | |

20 | ||

21 | is | |

22 | ||

23 | -- | |

24 | -- Package methods for shapes | |

25 | -- | |

26 | ||

3c34883c O |
27 | Add(S : Shape from TopoDS; |

28 | B : in out Box from Bnd; | |

29 | useTriangulation: Boolean from Standard = Standard_True); | |

7fd59977 | 30 | ---Purpose:Adds the shape S to the bounding box B. |

31 | -- More precisely are successively added to B: | |

32 | -- - each face of S; the triangulation of the face is used if it exists, | |

33 | -- - then each edge of S which does not belong to a face, | |

34 | -- the polygon of the edge is used if it exists | |

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

36 | -- After each elementary operation, the bounding box B is | |

37 | -- enlarged by the tolerance value of the relative sub-shape. | |

38 | -- When working with the triangulation of a face this value of | |

39 | -- enlargement is the sum of the triangulation deflection and | |

40 | -- the face tolerance. When working with the | |

41 | -- polygon of an edge this value of enlargement is | |

42 | -- the sum of the polygon deflection and the edge tolerance. | |

43 | -- Warning | |

44 | -- - This algorithm is time consuming if triangulation has not | |

45 | -- been inserted inside the data structure of the shape S. | |

46 | -- - The resulting bounding box may be somewhat larger than the object. | |

47 | ||

48 | ||

49 | AddClose(S : Shape from TopoDS; B : in out Box from Bnd); | |

50 | ---Purpose: Adds the shape S to the bounding box B. | |

51 | -- This is a quick algorithm but only works if the shape S is | |

52 | -- composed of polygonal planar faces, as is the case if S is | |

53 | -- an approached polyhedral representation of an exact | |

54 | -- shape. Pay particular attention to this because this | |

55 | -- condition is not checked and, if it not respected, an error | |

56 | -- may occur in the algorithm for which the bounding box is built. | |

57 | -- Note that the resulting bounding box is not enlarged by the | |

58 | -- tolerance value of the sub-shapes as is the case with the | |

59 | -- Add function. So the added part of the resulting bounding | |

60 | -- box is closer to the shape S. | |

61 | ||

62 | ||

63 | end BRepBndLib; | |

64 | ||

65 | ||

66 | ||

67 |