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1 | // Created on: 1991-10-10 |
2 | // Created by: Jean Claude VAUTHIER |
3 | // Copyright (c) 1991-1999 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 _Convert_ParabolaToBSplineCurve_HeaderFile |
18 | #define _Convert_ParabolaToBSplineCurve_HeaderFile |
19 | |
20 | #include <Standard.hxx> |
21 | #include <Standard_DefineAlloc.hxx> |
22 | #include <Standard_Handle.hxx> |
23 | |
24 | #include <Convert_ConicToBSplineCurve.hxx> |
25 | #include <Standard_Real.hxx> |
26 | class gp_Parab2d; |
27 | |
28 | |
29 | |
30 | //! This algorithm converts a parabola into a non rational B-spline |
31 | //! curve. |
32 | //! The parabola is a Parab2d from package gp with the parametrization |
33 | //! P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the |
34 | //! apex of the parabola, Xdir is the normalized direction of the |
35 | //! symmetry axis of the parabola, Ydir is the normalized direction of |
36 | //! the directrix and F is the focal length. |
37 | //! KeyWords : |
38 | //! Convert, Parabola, BSplineCurve, 2D . |
39 | class Convert_ParabolaToBSplineCurve : public Convert_ConicToBSplineCurve |
40 | { |
41 | public: |
42 | |
43 | DEFINE_STANDARD_ALLOC |
44 | |
45 | |
46 | |
47 | //! The parabola Prb is limited between the parametric values U1, U2 |
48 | //! and the equivalent B-spline curve as the same orientation as the |
49 | //! parabola Prb. |
50 | Standard_EXPORT Convert_ParabolaToBSplineCurve(const gp_Parab2d& Prb, const Standard_Real U1, const Standard_Real U2); |
51 | |
52 | |
53 | |
54 | |
55 | protected: |
56 | |
57 | |
58 | |
59 | |
60 | |
61 | private: |
62 | |
63 | |
64 | |
65 | |
66 | |
67 | }; |
68 | |
69 | |
70 | |
71 | |
72 | |
73 | |
74 | |
75 | #endif // _Convert_ParabolaToBSplineCurve_HeaderFile |