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1 | // Copyright (c) 1995-1999 Matra Datavision |
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2 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
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3 | // |
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4 | // This file is part of Open CASCADE Technology software library. |
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5 | // |
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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 |
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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. |
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11 | // |
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12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
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14 | |
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15 | //JCV 16/10/91 |
16 | |
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17 | #include <Convert_ParabolaToBSplineCurve.hxx> |
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18 | #include <gp.hxx> |
19 | #include <gp_Ax2d.hxx> |
20 | #include <gp_Dir2d.hxx> |
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21 | #include <gp_Parab2d.hxx> |
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22 | #include <gp_Trsf2d.hxx> |
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23 | #include <TColgp_Array1OfPnt2d.hxx> |
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24 | #include <TColgp_HArray1OfPnt2d.hxx> |
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25 | #include <TColStd_Array1OfReal.hxx> |
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26 | #include <TColStd_HArray1OfInteger.hxx> |
27 | #include <TColStd_HArray1OfReal.hxx> |
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28 | |
29 | static Standard_Integer TheDegree = 2; |
30 | static Standard_Integer MaxNbKnots = 2; |
31 | static Standard_Integer MaxNbPoles = 3; |
32 | |
33 | //======================================================================= |
34 | //function : Convert_ParabolaToBSplineCurve |
35 | //purpose : |
36 | //======================================================================= |
37 | |
38 | Convert_ParabolaToBSplineCurve::Convert_ParabolaToBSplineCurve |
39 | (const gp_Parab2d& Prb, |
40 | const Standard_Real U1 , |
41 | const Standard_Real U2 ) |
42 | : Convert_ConicToBSplineCurve (MaxNbPoles, MaxNbKnots, TheDegree) |
43 | { |
44 | Standard_DomainError_Raise_if( Abs(U2 - U1) < Epsilon(0.), |
45 | "Convert_ParabolaToBSplineCurve"); |
46 | |
47 | Standard_Real UF = Min (U1, U2); |
48 | Standard_Real UL = Max( U1, U2); |
49 | |
50 | Standard_Real p = Prb.Parameter(); |
51 | |
52 | nbPoles = 3; |
53 | nbKnots = 2; |
54 | isperiodic = Standard_False; |
55 | knots->ChangeArray1()(1) = UF; mults->ChangeArray1()(1) = 3; |
56 | knots->ChangeArray1()(2) = UL; mults->ChangeArray1()(2) = 3; |
57 | |
58 | weights->ChangeArray1()(1) = 1.; |
59 | weights->ChangeArray1()(2) = 1.; |
60 | weights->ChangeArray1()(3) = 1.; |
61 | |
62 | gp_Dir2d Ox = Prb.Axis().XDirection(); |
63 | gp_Dir2d Oy = Prb.Axis().YDirection(); |
64 | Standard_Real S = ( Ox.X() * Oy.Y() - Ox.Y() * Oy.X() > 0.) ? 1 : -1; |
65 | |
66 | |
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67 | // poles expressed in the reference mark |
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68 | poles->ChangeArray1()(1) = |
69 | gp_Pnt2d( ( UF * UF) / ( 2. * p), S * UF ); |
70 | poles->ChangeArray1()(2) = |
71 | gp_Pnt2d( ( UF * UL) / ( 2. * p), S * ( UF + UL) / 2. ); |
72 | poles->ChangeArray1()(3) = |
73 | gp_Pnt2d( ( UL * UL) / ( 2. * p), S * UL ); |
74 | |
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75 | // replace the bspline in the mark of the parabola |
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76 | gp_Trsf2d Trsf; |
77 | Trsf.SetTransformation( Prb.Axis().XAxis(), gp::OX2d()); |
78 | poles->ChangeArray1()(1).Transform( Trsf); |
79 | poles->ChangeArray1()(2).Transform( Trsf); |
80 | poles->ChangeArray1()(3).Transform( Trsf); |
81 | } |
82 | |
83 | |