1 // Created on: 1997-05-28
2 // Created by: Xavier BENVENISTE
3 // Copyright (c) 1997-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
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.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #include <GeomLib_Check2dBSplineCurve.ixx>
18 #include <Geom_BSplineCurve.hxx>
19 #include <gp_Pnt2d.hxx>
20 #include <gp_Vec2d.hxx>
21 #include <Geom2d_BSplineCurve.hxx>
22 //=======================================================================
23 //function : GeomLib_Check2dBSplineCurve
25 //=======================================================================
27 GeomLib_Check2dBSplineCurve::GeomLib_Check2dBSplineCurve(const Handle(Geom2d_BSplineCurve)& Curve,
28 const Standard_Real Tolerance,
29 const Standard_Real AngularTolerance)
31 myDone(Standard_False),
32 myFixFirstTangent(Standard_False),
33 myFixLastTangent(Standard_False),
34 myAngularTolerance(Abs(AngularTolerance)),
35 myTolerance(Abs(Tolerance)),
36 myFirstPole(1.0,0.0e0),
37 myLastPole(1.0e0,0.0e0)
43 Standard_Real tangent_magnitude,
48 num_poles = Curve->NbPoles() ;
49 if (( ! myCurve->IsPeriodic() )&& num_poles >= 4) {
54 for (ii = 1 ; ii <= 2 ; ii++) {
55 tangent.SetCoord(ii,myCurve->Pole(2).Coord(ii) - myCurve->Pole(1).Coord(ii)) ;
56 a_vector.SetCoord(ii, myCurve->Pole(3).Coord(ii) - myCurve->Pole(1).Coord(ii)) ;
58 tangent_magnitude = tangent.Magnitude() ;
59 vector_magnitude = a_vector.Magnitude() ;
60 if (tangent_magnitude > myTolerance &&
61 vector_magnitude > myTolerance)
63 value = tangent.Dot(a_vector) ;
65 for (ii = 1 ; ii <= 2 ; ii++) {
66 diff.SetCoord(ii, (tangent.Coord(ii) / tangent_magnitude) + (a_vector.Coord(ii) / vector_magnitude)) ;
70 if (angular_value < myAngularTolerance) {
71 myFixFirstTangent = Standard_True ;
73 if (tangent_magnitude > 0.5e0 * vector_magnitude) {
74 factor = 0.5e0 * vector_magnitude / tangent_magnitude ;
76 for (ii = 1 ; ii <= 2 ; ii++) {
77 myFirstPole.SetCoord(ii, myCurve->Pole(1).Coord(ii) - factor * tangent.Coord(ii)) ;
83 for (ii = 1 ; ii <= 2 ; ii++) {
84 tangent.SetCoord(ii,myCurve->Pole(num_poles-1).Coord(ii) - myCurve->Pole(num_poles).Coord(ii)) ;
85 a_vector.SetCoord(ii, myCurve->Pole(num_poles-2).Coord(ii) - myCurve->Pole(num_poles).Coord(ii)) ;
87 tangent_magnitude = tangent.Magnitude() ;
88 vector_magnitude = a_vector.Magnitude() ;
90 if (tangent_magnitude > myTolerance &&
91 vector_magnitude > myTolerance)
93 value = tangent.Dot(a_vector) ;
95 for (ii = 1 ; ii <= 2 ; ii++) {
96 diff.SetCoord(ii, (tangent.Coord(ii) / tangent_magnitude) + (a_vector.Coord(ii) / vector_magnitude)) ;
100 if ( angular_value < myAngularTolerance) {
101 myFixLastTangent = Standard_True ;
103 if (tangent_magnitude > 0.5e0 * vector_magnitude) {
104 factor = 0.5e0 * vector_magnitude / tangent_magnitude ;
106 for (ii = 1 ; ii <= 2 ; ii++) {
107 myLastPole.SetCoord(ii, myCurve->Pole(num_poles).Coord(ii) - factor * tangent.Coord(ii)) ;
116 myDone = Standard_True ;
120 //=======================================================================
121 //function : NeedTangentFix
123 //=======================================================================
125 void GeomLib_Check2dBSplineCurve::NeedTangentFix(Standard_Boolean & FirstFlag,
126 Standard_Boolean & LastFlag) const
128 FirstFlag = myFixFirstTangent ;
129 LastFlag = myFixLastTangent ;
131 //=======================================================================
132 //function : FixTangent
134 //=======================================================================
136 Handle(Geom2d_BSplineCurve) GeomLib_Check2dBSplineCurve::FixedTangent(const Standard_Boolean FirstFlag,
137 const Standard_Boolean LastFlag)
139 Handle(Geom2d_BSplineCurve) new_curve ;
140 if ((myFixFirstTangent && FirstFlag) ||(myFixLastTangent && LastFlag)) {
142 Handle(Geom2d_BSplineCurve)::DownCast(myCurve->Copy()) ;
145 if (myFixFirstTangent && FirstFlag) {
146 new_curve->SetPole(2,
149 if (myFixLastTangent && LastFlag) {
150 Standard_Integer num_poles = myCurve->NbPoles() ;
151 new_curve->SetPole(num_poles-1,
155 myDone = Standard_True ;
158 //=======================================================================
159 //function : FixTangent
161 //=======================================================================
163 void GeomLib_Check2dBSplineCurve::FixTangent(const Standard_Boolean FirstFlag,
164 const Standard_Boolean LastFlag)
167 if (myFixFirstTangent && FirstFlag) {
171 if (myFixLastTangent && LastFlag) {
172 Standard_Integer num_poles = myCurve->NbPoles() ;
173 myCurve->SetPole(num_poles-1,
177 myDone = Standard_True ;