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1 | -- Created on: 1995-02-24 |

2 | -- Created by: Jacques GOUSSARD |

3 | -- Copyright (c) 1995-1999 Matra Datavision |

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

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5 | -- |

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

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7 | -- |

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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 |

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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. |

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13 | -- |

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

15 | -- commercial license or contractual agreement. |

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16 | |

17 | generic class SurfProps from Contap |

18 | (TheSurface as any; |

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19 | TheSurfaceTool as any) |

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20 | |

21 | ---Purpose: Internal tool used to compute the normal and its |

22 | -- derivatives. |

23 | |

24 | uses Pnt from gp, |

25 | Vec from gp |

26 | |

27 | is |

28 | |

29 | Normale(myclass; S: TheSurface; U,V: Real from Standard; |

30 | P: out Pnt from gp; |

31 | N: out Vec from gp); |

32 | |

33 | ---Purpose: Computes the point <P>, and normal vector <N> on |

34 | -- <S> at parameters U,V. |

35 | |

36 | |

37 | |

38 | DerivAndNorm(myclass; S: TheSurface; U,V: Real from Standard; |

39 | P : out Pnt from gp; |

40 | d1u,d1v: out Vec from gp; |

41 | N : out Vec from gp); |

42 | |

43 | ---Purpose: Computes the point <P>, and normal vector <N> on |

44 | -- <S> at parameters U,V. |

45 | |

46 | |

47 | |

48 | NormAndDn(myclass; S: TheSurface; U,V: Real from Standard; |

49 | P : out Pnt from gp; |

50 | N,Dnu,Dnv: out Vec from gp); |

51 | |

52 | ---Purpose: Computes the point <P>, normal vector <N>, and its |

53 | -- derivatives <Dnu> and <Dnv> on <S> at parameters U,V. |

54 | |

55 | |

56 | end SurfProps; |