1 // Created on: 1999-04-14
2 // Created by: Roman LYGIN
3 // Copyright (c) 1999-1999 Matra Datavision
4 // Copyright (c) 1999-2012 OPEN CASCADE SAS
6 // The content of this file is subject to the Open CASCADE Technology Public
7 // License Version 6.5 (the "License"). You may not use the content of this file
8 // except in compliance with the License. Please obtain a copy of the License
9 // at http://www.opencascade.org and read it completely before using this file.
11 // The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
12 // main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
14 // The Original Code and all software distributed under the License is
15 // distributed on an "AS IS" basis, without warranty of any kind, and the
16 // Initial Developer hereby disclaims all such warranties, including without
17 // limitation, any warranties of merchantability, fitness for a particular
18 // purpose or non-infringement. Please see the License for the specific terms
19 // and conditions governing the rights and limitations under the License.
23 #include <ShapeUpgrade_SplitCurve2dContinuity.ixx>
24 #include <Standard_ErrorHandler.hxx>
25 #include <Standard_Failure.hxx>
26 #include <Geom2d_BSplineCurve.hxx>
27 #include <Precision.hxx>
28 #include <ShapeUpgrade.hxx>
29 #include <Geom2d_TrimmedCurve.hxx>
30 #include <Geom2d_OffsetCurve.hxx>
31 #include <TColGeom2d_HArray1OfCurve.hxx>
32 #include <TColStd_HSequenceOfReal.hxx>
33 #include <TColGeom2d_HArray1OfCurve.hxx>
34 #include <ShapeExtend.hxx>
37 //=======================================================================
38 //function : ShapeUpgrade_SplitCurve2dContinuity
40 //=======================================================================
42 ShapeUpgrade_SplitCurve2dContinuity::ShapeUpgrade_SplitCurve2dContinuity()
44 myCriterion = GeomAbs_C1;
45 myTolerance = Precision::PConfusion();
49 //=======================================================================
50 //function : SetCriterion
52 //=======================================================================
54 void ShapeUpgrade_SplitCurve2dContinuity::SetCriterion(const GeomAbs_Shape Criterion)
56 myCriterion = Criterion;
57 switch (myCriterion) {
58 case GeomAbs_C0 : myCont = 0; break;
59 case GeomAbs_C1 : myCont = 1; break;
60 case GeomAbs_C2 : myCont = 2; break;
61 case GeomAbs_C3 : myCont = 3; break;
62 case GeomAbs_CN : myCont = 4; break;
67 //=======================================================================
68 //function : SetTolerance
70 //=======================================================================
72 void ShapeUpgrade_SplitCurve2dContinuity::SetTolerance(const Standard_Real Tol)
77 //=======================================================================
80 //=======================================================================
82 void ShapeUpgrade_SplitCurve2dContinuity::Compute()
84 if(myCurve->Continuity() < myCriterion)
85 myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
86 if (mySplitValues->Length() > 2)
87 myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
88 Standard_Real precision = Precision::PConfusion();
89 Standard_Real First = mySplitValues->Value(1);
90 Standard_Real Last = mySplitValues->Value(mySplitValues->Length());
91 if (myCurve->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))) {
92 Handle(Geom2d_TrimmedCurve) tmp = Handle(Geom2d_TrimmedCurve)::DownCast (myCurve);
93 Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve();
94 ShapeUpgrade_SplitCurve2dContinuity spc;
95 // spc.Init(BasCurve,Max(First,tmp->FirstParameter()),Min(Last,tmp->LastParameter()));
96 spc.Init(BasCurve,First,Last);
97 spc.SetSplitValues(mySplitValues);
98 spc.SetTolerance(myTolerance);
99 spc.SetCriterion(myCriterion);
101 mySplitValues->Clear();
102 mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
103 //mySplitValues = spc.SplitValues();
104 myStatus |= spc.myStatus;
107 else if (myCurve->IsKind(STANDARD_TYPE(Geom2d_OffsetCurve))) {
108 GeomAbs_Shape BasCriterion;
109 switch (myCriterion) {
111 case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break;
112 case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break;
113 case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset curve"<<endl;
115 cout << "Warning: ShapeUpgrade_SplitCurve2dContinuity: criterion C3 for Offset curve" << endl;
117 case GeomAbs_CN : BasCriterion = GeomAbs_CN; break;
119 Handle(Geom2d_OffsetCurve) tmp = Handle(Geom2d_OffsetCurve)::DownCast (myCurve);
120 Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve();
121 //Standard_Real Offset = tmp->Offset(); // Offset not used (skl)
122 ShapeUpgrade_SplitCurve2dContinuity spc;
123 // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last));
124 spc.Init(BasCurve,First,Last);
125 spc.SetSplitValues(mySplitValues);
126 spc.SetTolerance(myTolerance);
127 spc.SetCriterion(BasCriterion);
129 mySplitValues->Clear();
130 mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
131 myStatus |= spc.myStatus;
135 Handle(Geom2d_BSplineCurve) MyBSpline = Handle(Geom2d_BSplineCurve)::DownCast (myCurve);
136 if (MyBSpline.IsNull()) {
137 // if (ShapeUpgrade::Debug()) cout<<". curve is not a Bspline"<<endl;
142 Standard_Integer Deg=MyBSpline->Degree();
143 Standard_Integer NbKnots= MyBSpline->NbKnots();
144 // if (ShapeUpgrade::Debug()) cout<<". NbKnots="<<NbKnots<<endl;
148 Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1,
149 LastInd = MyBSpline->LastUKnotIndex()-1;
150 Standard_Integer iknot = FirstInd;
151 for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) {
152 Last = mySplitValues->Value(j);
153 for (; iknot <= LastInd; iknot++) {
154 Standard_Real valknot = MyBSpline->Knot(iknot);
155 if(valknot <= First + precision) continue;
156 if(valknot >= Last - precision) break;
157 Standard_Integer Continuity=Deg-MyBSpline->Multiplicity(iknot);
158 //Standard_Real tt = MyBSpline->Knot(iknot); // tt not used (skl)
159 if (Continuity < myCont) {
160 // At this knot, the curve is C0; try to remove Knot.
161 Standard_Boolean corrected = Standard_False;
162 Standard_Integer newMultiplicity = Deg - myCont;
163 if (newMultiplicity < 0) newMultiplicity = 0;
167 corrected = MyBSpline->RemoveKnot(iknot, newMultiplicity, myTolerance);
169 catch (Standard_Failure) {
170 corrected = Standard_False;
173 if (corrected && newMultiplicity > 0) {
174 Continuity=Deg-MyBSpline->Multiplicity(iknot);
175 corrected = (Continuity >= myCont);
178 // at this knot, the continuity is now C1. Nothing else to do.
179 // if (ShapeUpgrade::Debug()) cout<<". Correction at Knot "<<iknot<<endl;
180 myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
183 // impossible to force C1 within the tolerance:
184 // this knot will be a splitting value.
185 mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot));
187 // if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
195 if (mySplitValues->Length() > 2)
196 myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);