1 // Created on: 1995-09-22
2 // Created by: Bruno DUMORTIER
3 // Copyright (c) 1995-1999 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 <BRepFill_ApproxSeewing.ixx>
19 #include <AppParCurves_MultiCurve.hxx>
20 #include <AppDef_Compute.hxx>
21 #include <AppDef_MultiLine.hxx>
22 #include <AppDef_MultiPointConstraint.hxx>
23 #include <BSplCLib.hxx>
25 #include <Geom_BSplineCurve.hxx>
26 #include <Geom2d_BSplineCurve.hxx>
27 #include <TColgp_Array1OfPnt.hxx>
28 #include <TColgp_Array1OfPnt2d.hxx>
29 #include <TColStd_Array1OfReal.hxx>
30 #include <TColStd_Array1OfInteger.hxx>
33 //=======================================================================
34 //function : BRepFill_ApproxSeewing
36 //=======================================================================
38 BRepFill_ApproxSeewing::BRepFill_ApproxSeewing()
39 :myIsDone(Standard_False)
44 //=======================================================================
45 //function : BRepFill_ApproxSeewing
47 //=======================================================================
49 BRepFill_ApproxSeewing::BRepFill_ApproxSeewing(const BRepFill_MultiLine& ML)
50 :myIsDone(Standard_False)
56 //=======================================================================
59 //=======================================================================
61 void BRepFill_ApproxSeewing::Perform(const BRepFill_MultiLine& ML)
65 // evaluate the approximative length of the 3dCurve
67 Standard_Real Length = 0.;
68 Standard_Real U1 = myML.FirstParameter();
69 Standard_Real U2 = myML.LastParameter();
70 Standard_Integer NbPoints = 50;
71 Standard_Real Dist, dU = (U2 - U1) / ( 2*NbPoints - 1);
73 TColgp_Array1OfPnt2d LP(1,2*NbPoints); // tableau Longueur <-> Param
77 for ( i = 0; i < 2*NbPoints ; i++) {
78 P2 = myML.Value(U1 + i*dU);
79 Dist = P1.Distance(P2);
81 LP(i+1) = gp_Pnt2d( Length, U1 + (i*dU));
85 // On cherche a mettre NbPoints dans la curve.
86 // on met les points environ a Length/NbPoints.
88 AppDef_MultiLine MLS ( NbPoints);
89 AppDef_MultiPointConstraint MP ( 1, 2);
93 ML.Value3dOnF1OnF2(U1,P3d,PF1,PF2);
95 MP.SetPoint2d(2, PF1);
96 MP.SetPoint2d(3, PF2);
99 Standard_Real DCorde = Length / ( NbPoints - 1);
100 Standard_Real Corde = DCorde;
101 Standard_Integer Index = 1;
102 Standard_Real U, Alpha;
103 for ( i = 2; i < NbPoints; i++) {
104 while ( LP(Index).X() < Corde) Index ++;
105 Alpha = (Corde - LP(Index-1).X()) / (LP(Index).X() - LP(Index-1).X());
106 U = LP(Index-1).Y() + Alpha * ( LP(Index).Y() - LP(Index-1).Y());
107 AppDef_MultiPointConstraint MPC( 1, 2);
108 ML.Value3dOnF1OnF2(U,P3d,PF1,PF2);
109 MPC.SetPoint (1, P3d);
110 MPC.SetPoint2d(2, PF1);
111 MPC.SetPoint2d(3, PF2);
112 MLS.SetValue (i, MPC);
115 AppDef_MultiPointConstraint MPE( 1, 2);
116 ML.Value3dOnF1OnF2(U2,P3d,PF1,PF2);
117 MPE.SetPoint (1, P3d);
118 MPE.SetPoint2d(2, PF1);
119 MPE.SetPoint2d(3, PF2);
120 MLS.SetValue (NbPoints, MPE);
122 AppDef_Compute Fit(MLS);
124 Standard_Integer NbCurves = Fit.NbMultiCurves();
125 // Standard_Integer MaxDeg = 0;
127 if ( NbCurves == 0) {
129 cout << " TrimSurfaceTool : Approx echoue, on met les polygones" << endl;
132 TColStd_Array1OfReal Knots(1,NbPoints);
133 TColStd_Array1OfInteger Mults(1,NbPoints);
135 Mults(1) = Mults(NbPoints) = 2;
136 TColgp_Array1OfPnt P (1,NbPoints);
137 TColgp_Array1OfPnt2d P1(1,NbPoints);
138 TColgp_Array1OfPnt2d P2(1,NbPoints);
140 Standard_Real Uf = ML.FirstParameter();
141 Standard_Real Ul = ML.LastParameter();
142 Standard_Real dU = (Ul-Uf)/(NbPoints-1);
143 AppDef_MultiPointConstraint MPC;
144 for ( i = 1; i<= NbPoints-1; i++) {
147 P (i) = MPC.Point(1);
148 P1(i) = MPC.Point2d(2);
149 P2(i) = MPC.Point2d(3);
152 // eval the last point on Ul
153 MPC = MLS.Value(NbPoints);
154 P (NbPoints) = MPC.Point(1);
155 P1(NbPoints) = MPC.Point2d(2);
156 P2(NbPoints) = MPC.Point2d(3);
157 Knots(NbPoints) = Ul;
159 myCurve = new Geom_BSplineCurve ( P , Knots, Mults, 1);
160 myPCurve1 = new Geom2d_BSplineCurve( P1, Knots, Mults, 1);
161 myPCurve2 = new Geom2d_BSplineCurve( P2, Knots, Mults, 1);
163 myIsDone = Standard_True;
168 // Les approx sont a priori OK.
170 const AppParCurves_MultiBSpCurve& MBSp =
172 Standard_Integer NbPoles = MBSp.NbPoles();
173 TColgp_Array1OfPnt Poles (1 , NbPoles);
174 TColgp_Array1OfPnt2d Poles2d1(1 , NbPoles);
175 TColgp_Array1OfPnt2d Poles2d2(1 , NbPoles);
177 MBSp.Curve(1, Poles);
178 MBSp.Curve(2, Poles2d1);
179 MBSp.Curve(3, Poles2d2);
181 const TColStd_Array1OfReal& Knots = MBSp.Knots();
182 const TColStd_Array1OfInteger& Mults = MBSp.Multiplicities();
183 Standard_Integer Degree = MBSp.Degree();
185 myCurve = new Geom_BSplineCurve (Poles, Knots,Mults,Degree);
186 myPCurve1 = new Geom2d_BSplineCurve(Poles2d1,Knots,Mults,Degree);
187 myPCurve2 = new Geom2d_BSplineCurve(Poles2d2,Knots,Mults,Degree);
189 myIsDone = Standard_True;
193 //=======================================================================
196 //=======================================================================
198 Standard_Boolean BRepFill_ApproxSeewing::IsDone() const
204 //=======================================================================
205 //function : Handle(Geom_Curve)&
207 //=======================================================================
209 const Handle(Geom_Curve)& BRepFill_ApproxSeewing::Curve() const
211 StdFail_NotDone_Raise_if( !myIsDone,
212 "BRepFill_ApproxSeewing::Curve");
217 //=======================================================================
218 //function : Handle(Geom2d_Curve)&
220 //=======================================================================
222 const Handle(Geom2d_Curve)& BRepFill_ApproxSeewing::CurveOnF1() const
224 StdFail_NotDone_Raise_if( !myIsDone,
225 "BRepFill_ApproxSeewing::CurveOnF1");
230 //=======================================================================
231 //function : Handle(Geom2d_Curve)&
233 //=======================================================================
235 const Handle(Geom2d_Curve)& BRepFill_ApproxSeewing::CurveOnF2() const
237 StdFail_NotDone_Raise_if( !myIsDone,
238 "BRepFill_ApproxSeewing::CurveOnF2");