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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 | |
17 | #include <ShapeUpgrade_SplitCurve2dContinuity.ixx> |
18 | #include <Standard_ErrorHandler.hxx> |
19 | #include <Standard_Failure.hxx> |
20 | #include <Geom2d_BSplineCurve.hxx> |
21 | #include <Precision.hxx> |
22 | #include <ShapeUpgrade.hxx> |
23 | #include <Geom2d_TrimmedCurve.hxx> |
24 | #include <Geom2d_OffsetCurve.hxx> |
25 | #include <TColGeom2d_HArray1OfCurve.hxx> |
26 | #include <TColStd_HSequenceOfReal.hxx> |
27 | #include <TColGeom2d_HArray1OfCurve.hxx> |
28 | #include <ShapeExtend.hxx> |
29 | |
30 | |
31 | //======================================================================= |
32 | //function : ShapeUpgrade_SplitCurve2dContinuity |
33 | //purpose : |
34 | //======================================================================= |
35 | |
36 | ShapeUpgrade_SplitCurve2dContinuity::ShapeUpgrade_SplitCurve2dContinuity() |
37 | { |
38 | myCriterion = GeomAbs_C1; |
39 | myTolerance = Precision::PConfusion(); |
40 | myCont =1; |
41 | } |
42 | |
43 | //======================================================================= |
44 | //function : SetCriterion |
45 | //purpose : |
46 | //======================================================================= |
47 | |
48 | void ShapeUpgrade_SplitCurve2dContinuity::SetCriterion(const GeomAbs_Shape Criterion) |
49 | { |
50 | myCriterion = Criterion; |
51 | switch (myCriterion) { |
52 | case GeomAbs_C0 : myCont = 0; break; |
53 | case GeomAbs_C1 : myCont = 1; break; |
54 | case GeomAbs_C2 : myCont = 2; break; |
55 | case GeomAbs_C3 : myCont = 3; break; |
56 | case GeomAbs_CN : myCont = 4; break; |
57 | default : myCont = 1; |
58 | } |
59 | } |
60 | |
61 | //======================================================================= |
62 | //function : SetTolerance |
63 | //purpose : |
64 | //======================================================================= |
65 | |
66 | void ShapeUpgrade_SplitCurve2dContinuity::SetTolerance(const Standard_Real Tol) |
67 | { |
68 | myTolerance = Tol; |
69 | } |
70 | |
71 | //======================================================================= |
72 | //function : Compute |
73 | //purpose : |
74 | //======================================================================= |
75 | |
76 | void ShapeUpgrade_SplitCurve2dContinuity::Compute() |
77 | { |
78 | if(myCurve->Continuity() < myCriterion) |
79 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2); |
80 | if (mySplitValues->Length() > 2) |
81 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
82 | Standard_Real precision = Precision::PConfusion(); |
83 | Standard_Real First = mySplitValues->Value(1); |
84 | Standard_Real Last = mySplitValues->Value(mySplitValues->Length()); |
85 | if (myCurve->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))) { |
86 | Handle(Geom2d_TrimmedCurve) tmp = Handle(Geom2d_TrimmedCurve)::DownCast (myCurve); |
87 | Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve(); |
88 | ShapeUpgrade_SplitCurve2dContinuity spc; |
89 | // spc.Init(BasCurve,Max(First,tmp->FirstParameter()),Min(Last,tmp->LastParameter())); |
90 | spc.Init(BasCurve,First,Last); |
91 | spc.SetSplitValues(mySplitValues); |
92 | spc.SetTolerance(myTolerance); |
93 | spc.SetCriterion(myCriterion); |
94 | spc.Compute(); |
95 | mySplitValues->Clear(); |
96 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
97 | //mySplitValues = spc.SplitValues(); |
98 | myStatus |= spc.myStatus; |
99 | return; |
100 | } |
101 | else if (myCurve->IsKind(STANDARD_TYPE(Geom2d_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; |
107 | case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset curve"<<endl; |
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108 | #ifdef OCCT_DEBUG |
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109 | cout << "Warning: ShapeUpgrade_SplitCurve2dContinuity: criterion C3 for Offset curve" << endl; |
110 | #endif |
111 | case GeomAbs_CN : BasCriterion = GeomAbs_CN; break; |
112 | } |
113 | Handle(Geom2d_OffsetCurve) tmp = Handle(Geom2d_OffsetCurve)::DownCast (myCurve); |
114 | Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve(); |
115 | //Standard_Real Offset = tmp->Offset(); // Offset not used (skl) |
116 | ShapeUpgrade_SplitCurve2dContinuity spc; |
117 | // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last)); |
118 | spc.Init(BasCurve,First,Last); |
119 | spc.SetSplitValues(mySplitValues); |
120 | spc.SetTolerance(myTolerance); |
121 | spc.SetCriterion(BasCriterion); |
122 | spc.Compute(); |
123 | mySplitValues->Clear(); |
124 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
125 | myStatus |= spc.myStatus; |
126 | return; |
127 | } |
128 | |
129 | Handle(Geom2d_BSplineCurve) MyBSpline = Handle(Geom2d_BSplineCurve)::DownCast (myCurve); |
130 | if (MyBSpline.IsNull()) { |
131 | // if (ShapeUpgrade::Debug()) cout<<". curve is not a Bspline"<<endl; |
132 | return; |
133 | } |
134 | |
135 | myNbCurves=1; |
136 | Standard_Integer Deg=MyBSpline->Degree(); |
137 | Standard_Integer NbKnots= MyBSpline->NbKnots(); |
138 | // if (ShapeUpgrade::Debug()) cout<<". NbKnots="<<NbKnots<<endl; |
139 | if (NbKnots <= 2) { |
140 | return; |
141 | } |
142 | Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1, |
143 | LastInd = MyBSpline->LastUKnotIndex()-1; |
144 | Standard_Integer iknot = FirstInd; |
145 | for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) { |
146 | Last = mySplitValues->Value(j); |
147 | for (; iknot <= LastInd; iknot++) { |
148 | Standard_Real valknot = MyBSpline->Knot(iknot); |
149 | if(valknot <= First + precision) continue; |
150 | if(valknot >= Last - precision) break; |
151 | Standard_Integer Continuity=Deg-MyBSpline->Multiplicity(iknot); |
152 | //Standard_Real tt = MyBSpline->Knot(iknot); // tt not used (skl) |
153 | if (Continuity < myCont) { |
154 | // At this knot, the curve is C0; try to remove Knot. |
155 | Standard_Boolean corrected = Standard_False; |
156 | Standard_Integer newMultiplicity = Deg - myCont; |
157 | if (newMultiplicity < 0) newMultiplicity = 0; |
158 | { |
159 | try { |
160 | OCC_CATCH_SIGNALS |
161 | corrected = MyBSpline->RemoveKnot(iknot, newMultiplicity, myTolerance); |
162 | } |
163 | catch (Standard_Failure) { |
164 | corrected = Standard_False; |
165 | } |
166 | } |
167 | if (corrected && newMultiplicity > 0) { |
168 | Continuity=Deg-MyBSpline->Multiplicity(iknot); |
169 | corrected = (Continuity >= myCont); |
170 | } |
171 | if (corrected) { |
172 | // at this knot, the continuity is now C1. Nothing else to do. |
173 | // if (ShapeUpgrade::Debug()) cout<<". Correction at Knot "<<iknot<<endl; |
174 | myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 ); |
175 | } |
176 | else { |
177 | // impossible to force C1 within the tolerance: |
178 | // this knot will be a splitting value. |
179 | mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot)); |
180 | myNbCurves++; |
181 | // if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl; |
182 | } |
183 | } |
184 | } |
185 | |
186 | First = Last; |
187 | } |
188 | |
189 | if (mySplitValues->Length() > 2) |
190 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
191 | } |
192 | |