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b311480e | 1 | -- Created on: 1991-10-28 |

2 | -- Created by: Remi LEQUETTE | |

3 | -- Copyright (c) 1991-1999 Matra Datavision | |

4 | -- Copyright (c) 1999-2012 OPEN CASCADE SAS | |

5 | -- | |

6 | -- The content of this file is subject to the Open CASCADE Technology Public | |

7 | -- License Version 6.5 (the "License"). You may not use the content of this file | |

8 | -- except in compliance with the License. Please obtain a copy of the License | |

9 | -- at http://www.opencascade.org and read it completely before using this file. | |

10 | -- | |

11 | -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its | |

12 | -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. | |

13 | -- | |

14 | -- The Original Code and all software distributed under the License is | |

15 | -- distributed on an "AS IS" basis, without warranty of any kind, and the | |

16 | -- Initial Developer hereby disclaims all such warranties, including without | |

17 | -- limitation, any warranties of merchantability, fitness for a particular | |

18 | -- purpose or non-infringement. Please see the License for the specific terms | |

19 | -- and conditions governing the rights and limitations under the License. | |

20 | ||

7fd59977 | 21 | |

22 | ||

23 | package TopTrans | |

24 | ||

25 | ---Purpose: This package provides algorithms to compute | |

26 | -- complex transitions. A transition is the status of | |

27 | -- geometry near the boundary of a Shape. An example | |

28 | -- is the intersection of a curve and a surface | |

29 | -- enclosing a solid , the transition tells if the | |

30 | -- parts of the curve just before and just after the | |

31 | -- intersection are inside, outside or on the | |

32 | -- boundary of the solid. | |

33 | -- | |

34 | -- The difficulty with transitions arise when dealing | |

35 | -- with trimmed geometries like edges and faces. When | |

36 | -- the geometric intersections are inside the trimmed | |

37 | -- geometry the transition is usually computed by the | |

38 | -- intersection algorithms as the trimming can be | |

39 | -- safely ignored. If the intersection falls on the | |

40 | -- trimming boundaries one must consider the | |

41 | -- neighbouring entities. Consider as an example the | |

42 | -- intersection of a curve and a solid, if the | |

43 | -- intersection falls on an edge of the solid it does | |

44 | -- not falls inside the two faces adjacent to the | |

45 | -- edge, a complex transition occurs. | |

46 | -- | |

47 | -- This package provides two classes : | |

48 | -- | |

49 | -- * CurveTransition is used to compute complex | |

50 | -- transitions with an other curve. | |

51 | -- | |

52 | -- * SurfaceTransition is used to compute complex | |

53 | -- transitions in 3D space. | |

54 | -- | |

55 | -- The curves and surfaces are given by a first or | |

56 | -- second order approximation around the intersection | |

57 | -- point. For a curve, the tangent vector or the | |

58 | -- osculating circle. For a surface the normal vector | |

59 | -- or the osculating quadric. | |

60 | ||

61 | uses | |

62 | Standard, | |

63 | TCollection, | |

64 | TColStd, | |

65 | gp, | |

66 | TopAbs | |

67 | ||

68 | is | |

69 | ||

70 | class Array2OfOrientation instantiates | |

71 | Array2 from TCollection (Orientation from TopAbs); | |

72 | ||

73 | class CurveTransition; | |

74 | ||

75 | class SurfaceTransition; | |

76 | ||

77 | end TopTrans; |