1 // Created on: 1992-10-22
2 // Created by: Laurent BUCHARD
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
18 #include <Adaptor2d_Curve2d.hxx>
19 #include <Geom2d_BezierCurve.hxx>
20 #include <Geom2d_BSplineCurve.hxx>
21 #include <Geom2dInt_Geom2dCurveTool.hxx>
22 #include <GeomAbs_CurveType.hxx>
23 #include <gp_Pnt2d.hxx>
24 #include <gp_Vec2d.hxx>
25 #include <Precision.hxx>
26
27 //============================================================
NbSamples(const Adaptor2d_Curve2d & C,const Standard_Real U0,const Standard_Real U1)28 Standard_Integer Geom2dInt_Geom2dCurveTool::NbSamples (const Adaptor2d_Curve2d& C,
29 const Standard_Real U0,
30 const Standard_Real U1)
31 {
32 GeomAbs_CurveType typC = C.GetType();
33 Standard_Integer nbs = C.NbSamples();
34
35 if(typC == GeomAbs_BSplineCurve)
36 {
37 Standard_Real t=C.LastParameter()-C.FirstParameter();
38 if(t > Precision::PConfusion())
39 {
40 Standard_Real t1 = U1 - U0;
41 if(t1 < 0.0) t1 = -t1;
42 nbs = C.NbKnots();
43 nbs*= C.Degree();
44 Standard_Real anb = t1 / t * nbs;
45 nbs = (Standard_Integer)anb;
46
47 Standard_Integer aMinPntNb = Max(C.Degree() + 1, 4);
48 if(nbs < aMinPntNb)
49 nbs = aMinPntNb;
50 }
51 }
52 else if (typC == GeomAbs_Circle)
53 {
54 //Try to reach deflection = eps*R, eps = 0.01
55 const Standard_Real minR = 1.; //eps = 0.01
56 Standard_Real R = C.Circle().Radius();
57 if(R > minR)
58 {
59 Standard_Real angl = 0.283079; //2.*ACos(1. - eps);
60 Standard_Integer n = RealToInt(Abs(U1 - U0) / angl);
61 nbs = Max(n, nbs);
62 }
63 }
64
65 if(nbs>300)
66 nbs = 300;
67 return nbs;
68
69 }
70 //============================================================
NbSamples(const Adaptor2d_Curve2d & C)71 Standard_Integer Geom2dInt_Geom2dCurveTool::NbSamples (const Adaptor2d_Curve2d& C) {
72 Standard_Integer nbs = C.NbSamples();
73 GeomAbs_CurveType typC = C.GetType();
74 if (typC == GeomAbs_Circle)
75 {
76 //Try to reach deflection = eps*R, eps = 0.01
77 const Standard_Real minR = 1.; //eps = 0.01
78 Standard_Real R = C.Circle().Radius();
79 if(R > minR)
80 {
81 Standard_Real angl = 0.283079; //2.*ACos(1. - eps);
82 Standard_Integer n = RealToInt((C.LastParameter()-C.FirstParameter()) / angl);
83 nbs = Max(n, nbs);
84 }
85 }
86
87 return nbs;
88 }
89
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