1 // Copyright (c) 1995-1999 Matra Datavision
2 // Copyright (c) 1999-2014 OPEN CASCADE SAS
4 // This file is part of Open CASCADE Technology software library.
6 // This library is free software; you can redistribute it and/or modify it under
7 // the terms of the GNU Lesser General Public License version 2.1 as published
8 // by the Free Software Foundation, with special exception defined in the file
9 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
10 // distribution for complete text of the license and disclaimer of any warranty.
12 // Alternatively, this file may be used under the terms of Open CASCADE
13 // commercial license or contractual agreement.
17 #include <gp_Elips2d.hxx>
19 #include <gp_Ax2d.hxx>
20 #include <gp_Ax22d.hxx>
21 #include <gp_Pnt2d.hxx>
22 #include <gp_Trsf2d.hxx>
23 #include <gp_Vec2d.hxx>
25 void gp_Elips2d::Coefficients (Standard_Real& A,
30 Standard_Real& F) const
32 Standard_Real DMin = minorRadius * minorRadius;
33 Standard_Real DMaj = majorRadius * majorRadius;
34 if (DMin <= gp::Resolution() && DMaj <= gp::Resolution()) {
35 A = B = C = D = E = F = 0.0;
39 T.SetTransformation (pos.XAxis());
40 Standard_Real T11 = T.Value (1, 1);
41 Standard_Real T12 = T.Value (1, 2);
42 Standard_Real T13 = T.Value (1, 3);
43 if (DMin <= gp::Resolution()) {
44 A = T11 * T11; B = T12 * T12; C = T11 * T12;
45 D = T11 * T13; E = T12 * T13; F = T13 * T13 - DMaj;
48 Standard_Real T21 = T.Value (2, 1);
49 Standard_Real T22 = T.Value (2, 2);
50 Standard_Real T23 = T.Value (2, 3);
51 A = (T11 * T11 / DMaj) + (T21 * T21 / DMin);
52 B = (T12 * T12 / DMaj) + (T22 * T22 / DMin);
53 C = (T11 * T12 / DMaj) + (T21 * T22 / DMin);
54 D = (T11 * T13 / DMaj) + (T21 * T23 / DMin);
55 E = (T12 * T13 / DMaj) + (T22 * T23 / DMin);
56 F = (T13 * T13 / DMaj) + (T23 * T23 / DMin) - 1.0;
61 void gp_Elips2d::Mirror (const gp_Pnt2d& P)
64 gp_Elips2d gp_Elips2d::Mirrored (const gp_Pnt2d& P) const
71 void gp_Elips2d::Mirror (const gp_Ax2d& A)
74 gp_Elips2d gp_Elips2d::Mirrored (const gp_Ax2d& A) const