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1 | // Created on: 1999-04-15 |
2 | // Created by: Roman LYGIN |
3 | // Copyright (c) 1999-1999 Matra Datavision |
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4 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | // |
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6 | // This file is part of Open CASCADE Technology software library. |
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7 | // |
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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 |
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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. |
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13 | // |
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14 | // Alternatively, this file may be used under the terms of Open CASCADE |
15 | // commercial license or contractual agreement. |
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16 | |
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17 | |
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18 | #include <Geom_BSplineCurve.hxx> |
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19 | #include <Geom_Curve.hxx> |
20 | #include <Geom_OffsetCurve.hxx> |
21 | #include <Geom_TrimmedCurve.hxx> |
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22 | #include <Precision.hxx> |
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23 | #include <ShapeExtend.hxx> |
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24 | #include <ShapeUpgrade.hxx> |
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25 | #include <ShapeUpgrade_SplitCurve3dContinuity.hxx> |
26 | #include <Standard_ErrorHandler.hxx> |
27 | #include <Standard_Failure.hxx> |
28 | #include <Standard_Type.hxx> |
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29 | #include <TColGeom_HArray1OfCurve.hxx> |
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30 | #include <TColStd_HSequenceOfReal.hxx> |
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31 | |
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32 | IMPLEMENT_STANDARD_RTTIEXT(ShapeUpgrade_SplitCurve3dContinuity,ShapeUpgrade_SplitCurve3d) |
33 | |
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34 | //======================================================================= |
35 | //function : ShapeUpgrade_SplitCurve3dContinuity |
36 | //purpose : |
37 | //======================================================================= |
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38 | ShapeUpgrade_SplitCurve3dContinuity::ShapeUpgrade_SplitCurve3dContinuity() |
39 | { |
40 | myCriterion = GeomAbs_C1; |
41 | myTolerance = Precision::Confusion(); |
42 | myCont =1; |
43 | } |
44 | |
45 | //======================================================================= |
46 | //function : SetCriterion |
47 | //purpose : |
48 | //======================================================================= |
49 | |
50 | void ShapeUpgrade_SplitCurve3dContinuity::SetCriterion(const GeomAbs_Shape Criterion) |
51 | { |
52 | myCriterion = Criterion; |
53 | switch (myCriterion) { |
54 | case GeomAbs_C0 : myCont = 0; break; |
55 | case GeomAbs_C1 : myCont = 1; break; |
56 | case GeomAbs_C2 : myCont = 2; break; |
57 | case GeomAbs_C3 : myCont = 3; break; |
58 | case GeomAbs_CN : myCont = 4; break; |
59 | default : myCont = 1; |
60 | } |
61 | } |
62 | |
63 | //======================================================================= |
64 | //function : SetTolerance |
65 | //purpose : |
66 | //======================================================================= |
67 | |
68 | void ShapeUpgrade_SplitCurve3dContinuity::SetTolerance(const Standard_Real Tol) |
69 | { |
70 | myTolerance = Tol; |
71 | } |
72 | |
73 | //======================================================================= |
74 | //function : Compute |
75 | //purpose : |
76 | //=================================================================== |
77 | void ShapeUpgrade_SplitCurve3dContinuity::Compute() |
78 | { |
79 | Standard_Real First = mySplitValues->Value(1); |
80 | Standard_Real Last = mySplitValues->Value(mySplitValues->Length()); |
81 | Standard_Real precision = Precision::PConfusion(); |
82 | if(myCurve->Continuity() < myCriterion) |
83 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2); |
84 | if (mySplitValues->Length() > 2) |
85 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
86 | if (myCurve->IsKind(STANDARD_TYPE(Geom_TrimmedCurve))) { |
87 | Handle(Geom_TrimmedCurve) tmp = Handle(Geom_TrimmedCurve)::DownCast (myCurve); |
88 | Handle(Geom_Curve) BasCurve = tmp->BasisCurve(); |
89 | ShapeUpgrade_SplitCurve3dContinuity spc; |
90 | // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last)); |
91 | spc.Init(BasCurve,First,Last); |
92 | spc.SetSplitValues(mySplitValues); |
93 | spc.SetTolerance(myTolerance); |
94 | spc.SetCriterion(myCriterion); |
95 | spc.Compute(); |
96 | mySplitValues->Clear(); |
97 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
98 | myStatus |= spc.myStatus; |
99 | return; |
100 | } |
101 | else if (myCurve->IsKind(STANDARD_TYPE(Geom_OffsetCurve))) { |
102 | GeomAbs_Shape BasCriterion; |
103 | switch (myCriterion) { |
104 | default : |
105 | case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break; |
106 | case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break; |
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107 | case GeomAbs_C3 : // if (ShapeUpgrade::Debug()) std::cout<<". this criterion is not suitable for a Offset curve"<<std::endl; |
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108 | #ifdef OCCT_DEBUG |
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109 | std::cout << "Warning: ShapeUpgrade_SplitCurve3dContinuity: criterion C3 for Offset curve" << std::endl; |
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110 | #endif |
111 | case GeomAbs_CN : BasCriterion = GeomAbs_CN; break; |
112 | } |
113 | Handle(Geom_OffsetCurve) tmp = Handle(Geom_OffsetCurve)::DownCast (myCurve); |
114 | Handle(Geom_Curve) BasCurve = tmp->BasisCurve(); |
115 | //Standard_Real Offset = tmp->Offset(); // Offset not used (skl) |
116 | //gp_Dir Direct = tmp->Direction(); // Direct not used (skl) |
117 | ShapeUpgrade_SplitCurve3dContinuity spc; |
118 | // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last)); |
119 | spc.Init(BasCurve,First,Last); |
120 | spc.SetSplitValues(mySplitValues); |
121 | spc.SetTolerance(myTolerance); |
122 | spc.SetCriterion(BasCriterion); |
123 | spc.Compute(); |
124 | mySplitValues->Clear(); |
125 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
126 | myStatus |= spc.myStatus; |
127 | return ; |
128 | } |
129 | |
130 | Handle(Geom_BSplineCurve) MyBSpline = Handle(Geom_BSplineCurve)::DownCast (myCurve); |
131 | if (MyBSpline.IsNull()) { |
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132 | // if (ShapeUpgrade::Debug()) std::cout<<". curve is not a Bspline"<<std::endl; |
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133 | return ; |
134 | } |
135 | // it is a BSplineCurve |
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136 | // if (ShapeUpgrade::Debug()) std::cout<<". curve is a Bspline"<<std::endl; |
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137 | |
138 | myNbCurves=1; |
139 | Standard_Integer Deg=MyBSpline->Degree(); |
140 | Standard_Integer NbKnots= MyBSpline->NbKnots(); |
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141 | // if (ShapeUpgrade::Debug()) std::cout<<". NbKnots="<<NbKnots<<std::endl; |
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142 | if (NbKnots <= 2) { |
143 | return; |
144 | } |
145 | // Only the internal knots are checked. |
146 | Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1, |
147 | LastInd = MyBSpline->LastUKnotIndex()-1; |
148 | for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) { |
149 | Last = mySplitValues->Value(j); |
150 | for (Standard_Integer iknot = FirstInd; iknot <= LastInd; iknot++) { |
151 | Standard_Real valknot = MyBSpline->Knot(iknot); |
152 | if(valknot <= First + precision) continue; |
153 | if(valknot > Last - precision) break; |
154 | Standard_Integer Continuity=Deg-MyBSpline->Multiplicity(iknot); |
155 | if (Continuity < myCont) { |
156 | // At this knot, the curve is C0; try to remove Knot. |
157 | Standard_Boolean corrected = Standard_False; |
158 | Standard_Integer newMultiplicity = Deg - myCont; |
159 | if (newMultiplicity < 0) newMultiplicity = 0; |
160 | { |
161 | try { |
162 | OCC_CATCH_SIGNALS |
163 | corrected = MyBSpline->RemoveKnot(iknot, newMultiplicity, myTolerance); |
164 | } |
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165 | catch (Standard_Failure const&) { |
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166 | corrected = Standard_False; |
167 | } |
168 | } |
169 | |
170 | |
171 | if (corrected && newMultiplicity > 0) { |
172 | Continuity=Deg-MyBSpline->Multiplicity(iknot); |
173 | corrected = (Continuity >= myCont); |
174 | } |
175 | if (corrected) { |
176 | // at this knot, the continuity is now C1. Nothing else to do. |
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177 | // if (ShapeUpgrade::Debug()) std::cout<<". Correction at Knot "<<iknot<<std::endl; |
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178 | myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 ); |
179 | if(newMultiplicity == 0) { |
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180 | //in case if knot is completely removed |
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181 | //it is necessary to modify last idex and decrease current knot index |
182 | LastInd = MyBSpline->LastUKnotIndex()-1; |
183 | iknot--; |
184 | } |
185 | } |
186 | else { |
187 | // impossible to force C1 within the tolerance: |
188 | // this knot will be a splitting value. |
189 | mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot)); |
190 | myNbCurves++; |
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191 | // if (ShapeUpgrade::Debug()) std::cout<<". Splitting at Knot "<<iknot<<std::endl; |
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192 | } |
193 | } |
194 | } |
195 | First = Last; |
196 | } |
197 | |
198 | if (mySplitValues->Length() > 2) |
199 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
200 | } |
201 | |
202 | //======================================================================= |
203 | //function : GetCurve |
204 | //purpose : |
205 | //======================================================================= |
206 | |
207 | const Handle(Geom_Curve)& ShapeUpgrade_SplitCurve3dContinuity::GetCurve() const |
208 | { |
209 | return myCurve; |
210 | } |