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1 | // Created on: 1999-04-14 |
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 <Geom2d_BSplineCurve.hxx> |
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19 | #include <Geom2d_OffsetCurve.hxx> |
20 | #include <Geom2d_TrimmedCurve.hxx> |
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21 | #include <Precision.hxx> |
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22 | #include <ShapeExtend.hxx> |
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23 | #include <ShapeUpgrade.hxx> |
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24 | #include <ShapeUpgrade_SplitCurve2dContinuity.hxx> |
25 | #include <Standard_ErrorHandler.hxx> |
26 | #include <Standard_Failure.hxx> |
27 | #include <Standard_Type.hxx> |
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28 | #include <TColGeom2d_HArray1OfCurve.hxx> |
29 | #include <TColStd_HSequenceOfReal.hxx> |
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30 | |
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31 | IMPLEMENT_STANDARD_RTTIEXT(ShapeUpgrade_SplitCurve2dContinuity,ShapeUpgrade_SplitCurve2d) |
32 | |
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33 | //======================================================================= |
34 | //function : ShapeUpgrade_SplitCurve2dContinuity |
35 | //purpose : |
36 | //======================================================================= |
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37 | ShapeUpgrade_SplitCurve2dContinuity::ShapeUpgrade_SplitCurve2dContinuity() |
38 | { |
39 | myCriterion = GeomAbs_C1; |
40 | myTolerance = Precision::PConfusion(); |
41 | myCont =1; |
42 | } |
43 | |
44 | //======================================================================= |
45 | //function : SetCriterion |
46 | //purpose : |
47 | //======================================================================= |
48 | |
49 | void ShapeUpgrade_SplitCurve2dContinuity::SetCriterion(const GeomAbs_Shape Criterion) |
50 | { |
51 | myCriterion = Criterion; |
52 | switch (myCriterion) { |
53 | case GeomAbs_C0 : myCont = 0; break; |
54 | case GeomAbs_C1 : myCont = 1; break; |
55 | case GeomAbs_C2 : myCont = 2; break; |
56 | case GeomAbs_C3 : myCont = 3; break; |
57 | case GeomAbs_CN : myCont = 4; break; |
58 | default : myCont = 1; |
59 | } |
60 | } |
61 | |
62 | //======================================================================= |
63 | //function : SetTolerance |
64 | //purpose : |
65 | //======================================================================= |
66 | |
67 | void ShapeUpgrade_SplitCurve2dContinuity::SetTolerance(const Standard_Real Tol) |
68 | { |
69 | myTolerance = Tol; |
70 | } |
71 | |
72 | //======================================================================= |
73 | //function : Compute |
74 | //purpose : |
75 | //======================================================================= |
76 | |
77 | void ShapeUpgrade_SplitCurve2dContinuity::Compute() |
78 | { |
79 | if(myCurve->Continuity() < myCriterion) |
80 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2); |
81 | if (mySplitValues->Length() > 2) |
82 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
83 | Standard_Real precision = Precision::PConfusion(); |
84 | Standard_Real First = mySplitValues->Value(1); |
85 | Standard_Real Last = mySplitValues->Value(mySplitValues->Length()); |
86 | if (myCurve->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))) { |
87 | Handle(Geom2d_TrimmedCurve) tmp = Handle(Geom2d_TrimmedCurve)::DownCast (myCurve); |
88 | Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve(); |
89 | ShapeUpgrade_SplitCurve2dContinuity spc; |
90 | // spc.Init(BasCurve,Max(First,tmp->FirstParameter()),Min(Last,tmp->LastParameter())); |
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 | //mySplitValues = spc.SplitValues(); |
99 | myStatus |= spc.myStatus; |
100 | return; |
101 | } |
102 | else if (myCurve->IsKind(STANDARD_TYPE(Geom2d_OffsetCurve))) { |
103 | GeomAbs_Shape BasCriterion; |
104 | switch (myCriterion) { |
105 | default : |
106 | case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break; |
107 | case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break; |
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108 | case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) std::cout<<". this criterion is not suitable for a Offset curve"<<std::endl; |
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109 | #ifdef OCCT_DEBUG |
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110 | std::cout << "Warning: ShapeUpgrade_SplitCurve2dContinuity: criterion C3 for Offset curve" << std::endl; |
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111 | #endif |
112 | case GeomAbs_CN : BasCriterion = GeomAbs_CN; break; |
113 | } |
114 | Handle(Geom2d_OffsetCurve) tmp = Handle(Geom2d_OffsetCurve)::DownCast (myCurve); |
115 | Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve(); |
116 | //Standard_Real Offset = tmp->Offset(); // Offset not used (skl) |
117 | ShapeUpgrade_SplitCurve2dContinuity 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(Geom2d_BSplineCurve) MyBSpline = Handle(Geom2d_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 | |
136 | myNbCurves=1; |
137 | Standard_Integer Deg=MyBSpline->Degree(); |
138 | Standard_Integer NbKnots= MyBSpline->NbKnots(); |
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139 | // if (ShapeUpgrade::Debug()) std::cout<<". NbKnots="<<NbKnots<<std::endl; |
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140 | if (NbKnots <= 2) { |
141 | return; |
142 | } |
143 | Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1, |
144 | LastInd = MyBSpline->LastUKnotIndex()-1; |
145 | Standard_Integer iknot = FirstInd; |
146 | for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) { |
147 | Last = mySplitValues->Value(j); |
148 | for (; iknot <= LastInd; iknot++) { |
149 | Standard_Real valknot = MyBSpline->Knot(iknot); |
150 | if(valknot <= First + precision) continue; |
151 | if(valknot >= Last - precision) break; |
152 | Standard_Integer Continuity=Deg-MyBSpline->Multiplicity(iknot); |
153 | //Standard_Real tt = MyBSpline->Knot(iknot); // tt not used (skl) |
154 | if (Continuity < myCont) { |
155 | // At this knot, the curve is C0; try to remove Knot. |
156 | Standard_Boolean corrected = Standard_False; |
157 | Standard_Integer newMultiplicity = Deg - myCont; |
158 | if (newMultiplicity < 0) newMultiplicity = 0; |
159 | { |
160 | try { |
161 | OCC_CATCH_SIGNALS |
162 | corrected = MyBSpline->RemoveKnot(iknot, newMultiplicity, myTolerance); |
163 | } |
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164 | catch (Standard_Failure const&) { |
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165 | corrected = Standard_False; |
166 | } |
167 | } |
168 | if (corrected && newMultiplicity > 0) { |
169 | Continuity=Deg-MyBSpline->Multiplicity(iknot); |
170 | corrected = (Continuity >= myCont); |
171 | } |
172 | if (corrected) { |
173 | // at this knot, the continuity is now C1. Nothing else to do. |
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174 | // if (ShapeUpgrade::Debug()) std::cout<<". Correction at Knot "<<iknot<<std::endl; |
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175 | myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 ); |
176 | } |
177 | else { |
178 | // impossible to force C1 within the tolerance: |
179 | // this knot will be a splitting value. |
180 | mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot)); |
181 | myNbCurves++; |
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182 | // if (ShapeUpgrade::Debug()) std::cout<<". Splitting at Knot "<<iknot<<std::endl; |
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183 | } |
184 | } |
185 | } |
186 | |
187 | First = Last; |
188 | } |
189 | |
190 | if (mySplitValues->Length() > 2) |
191 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
192 | } |
193 | |