42cf5bc1 |
1 | // Created on: 1992-08-26 |
2 | // Created by: Remi GILET |
3 | // Copyright (c) 1992-1999 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 _gce_MakeParab_HeaderFile |
18 | #define _gce_MakeParab_HeaderFile |
19 | |
20 | #include <Standard.hxx> |
21 | #include <Standard_DefineAlloc.hxx> |
22 | #include <Standard_Handle.hxx> |
23 | |
24 | #include <gp_Parab.hxx> |
25 | #include <gce_Root.hxx> |
26 | #include <Standard_Real.hxx> |
27 | class StdFail_NotDone; |
28 | class gp_Ax2; |
29 | class gp_Ax1; |
30 | class gp_Pnt; |
31 | class gp_Parab; |
32 | |
33 | |
34 | //! This class implements the following algorithms used to |
35 | //! create Parab from gp. |
36 | //! Defines the parabola in the parameterization range : |
37 | //! ]-infinite, +infinite[ |
38 | //! The vertex of the parabola is the "Location" point of the |
39 | //! local coordinate system (axis placement) of the parabola. |
40 | //! |
41 | //! The "XDirection" and the "YDirection" of this system define |
42 | //! the plane of the parabola. |
43 | //! |
44 | //! The "XAxis" of the parabola ("Location", "XDirection") is |
45 | //! the axis of symmetry of the parabola. The Xaxis is oriented |
46 | //! from the vertex of the parabola to the Focus of the parabola. |
47 | //! |
48 | //! The "YAxis" of the parabola ("Location", "YDirection") is |
49 | //! parallel to the directrix of the parabola. |
50 | //! |
51 | //! The equation of the parabola in the local coordinates system is |
52 | //! Y**2 = (2*P) * X |
53 | //! P is the distance between the focus and the directrix of the |
54 | //! parabola (called Parameter). |
55 | //! The focal length F = P/2 is the distance between the vertex |
56 | //! and the focus of the parabola. |
57 | //! |
58 | //! * Creates a parabola with its local coordinate system "A2" |
59 | //! and it's focal length "Focal". |
60 | //! * Create a parabola with its directrix and its focus point. |
61 | class gce_MakeParab : public gce_Root |
62 | { |
63 | public: |
64 | |
65 | DEFINE_STANDARD_ALLOC |
66 | |
67 | |
68 | //! --- Purpose ; |
69 | //! Creates a parabola with its local coordinate system "A2" |
70 | //! and it's focal length "Focal". |
71 | //! The XDirection of A2 defines the axis of symmetry of the |
72 | //! parabola. The YDirection of A2 is parallel to the directrix |
73 | //! of the parabola. The Location point of A2 is the vertex of |
74 | //! the parabola |
75 | //! The status is "NullFocusLength" if Focal < 0.0 |
76 | Standard_EXPORT gce_MakeParab(const gp_Ax2& A2, const Standard_Real Focal); |
77 | |
78 | |
79 | //! D is the directrix of the parabola and F the focus point. |
80 | //! The symmetry axis (XAxis) of the parabola is normal to the |
81 | //! directrix and pass through the focus point F, but its |
82 | //! location point is the vertex of the parabola. |
83 | //! The YAxis of the parabola is parallel to D and its location |
84 | //! point is the vertex of the parabola. The normal to the plane |
85 | //! of the parabola is the cross product between the XAxis and the |
86 | //! YAxis. |
87 | Standard_EXPORT gce_MakeParab(const gp_Ax1& D, const gp_Pnt& F); |
88 | |
89 | //! Returns the constructed parabola. |
90 | //! Exceptions StdFail_NotDone if no parabola is constructed. |
91 | Standard_EXPORT const gp_Parab& Value() const; |
92 | |
93 | Standard_EXPORT const gp_Parab& Operator() const; |
94 | Standard_EXPORT operator gp_Parab() const; |
95 | |
96 | |
97 | |
98 | |
99 | protected: |
100 | |
101 | |
102 | |
103 | |
104 | |
105 | private: |
106 | |
107 | |
108 | |
109 | gp_Parab TheParab; |
110 | |
111 | |
112 | }; |
113 | |
114 | |
115 | |
116 | |
117 | |
118 | |
119 | |
120 | #endif // _gce_MakeParab_HeaderFile |