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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 | |
17 | #include <ShapeUpgrade_SplitCurve3dContinuity.ixx> |
18 | #include <Standard_ErrorHandler.hxx> |
19 | #include <Standard_Failure.hxx> |
20 | #include <Geom_BSplineCurve.hxx> |
21 | #include <Precision.hxx> |
22 | #include <ShapeUpgrade.hxx> |
23 | #include <Geom_TrimmedCurve.hxx> |
24 | #include <Geom_TrimmedCurve.hxx> |
25 | #include <Geom_OffsetCurve.hxx> |
26 | #include <Geom_Curve.hxx> |
27 | #include <TColStd_HSequenceOfReal.hxx> |
28 | #include <TColGeom_HArray1OfCurve.hxx> |
29 | #include <ShapeExtend.hxx> |
30 | |
31 | //======================================================================= |
32 | //function : ShapeUpgrade_SplitCurve3dContinuity |
33 | //purpose : |
34 | //======================================================================= |
35 | |
36 | ShapeUpgrade_SplitCurve3dContinuity::ShapeUpgrade_SplitCurve3dContinuity() |
37 | { |
38 | myCriterion = GeomAbs_C1; |
39 | myTolerance = Precision::Confusion(); |
40 | myCont =1; |
41 | } |
42 | |
43 | //======================================================================= |
44 | //function : SetCriterion |
45 | //purpose : |
46 | //======================================================================= |
47 | |
48 | void ShapeUpgrade_SplitCurve3dContinuity::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_SplitCurve3dContinuity::SetTolerance(const Standard_Real Tol) |
67 | { |
68 | myTolerance = Tol; |
69 | } |
70 | |
71 | //======================================================================= |
72 | //function : Compute |
73 | //purpose : |
74 | //=================================================================== |
75 | void ShapeUpgrade_SplitCurve3dContinuity::Compute() |
76 | { |
77 | Standard_Real First = mySplitValues->Value(1); |
78 | Standard_Real Last = mySplitValues->Value(mySplitValues->Length()); |
79 | Standard_Real precision = Precision::PConfusion(); |
80 | if(myCurve->Continuity() < myCriterion) |
81 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2); |
82 | if (mySplitValues->Length() > 2) |
83 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
84 | if (myCurve->IsKind(STANDARD_TYPE(Geom_TrimmedCurve))) { |
85 | Handle(Geom_TrimmedCurve) tmp = Handle(Geom_TrimmedCurve)::DownCast (myCurve); |
86 | Handle(Geom_Curve) BasCurve = tmp->BasisCurve(); |
87 | ShapeUpgrade_SplitCurve3dContinuity spc; |
88 | // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last)); |
89 | spc.Init(BasCurve,First,Last); |
90 | spc.SetSplitValues(mySplitValues); |
91 | spc.SetTolerance(myTolerance); |
92 | spc.SetCriterion(myCriterion); |
93 | spc.Compute(); |
94 | mySplitValues->Clear(); |
95 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
96 | myStatus |= spc.myStatus; |
97 | return; |
98 | } |
99 | else if (myCurve->IsKind(STANDARD_TYPE(Geom_OffsetCurve))) { |
100 | GeomAbs_Shape BasCriterion; |
101 | switch (myCriterion) { |
102 | default : |
103 | case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break; |
104 | case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break; |
105 | case GeomAbs_C3 : // if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset curve"<<endl; |
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106 | #ifdef SHAPEUPGRADE_DEB |
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107 | cout << "Warning: ShapeUpgrade_SplitCurve3dContinuity: criterion C3 for Offset curve" << endl; |
108 | #endif |
109 | case GeomAbs_CN : BasCriterion = GeomAbs_CN; break; |
110 | } |
111 | Handle(Geom_OffsetCurve) tmp = Handle(Geom_OffsetCurve)::DownCast (myCurve); |
112 | Handle(Geom_Curve) BasCurve = tmp->BasisCurve(); |
113 | //Standard_Real Offset = tmp->Offset(); // Offset not used (skl) |
114 | //gp_Dir Direct = tmp->Direction(); // Direct not used (skl) |
115 | ShapeUpgrade_SplitCurve3dContinuity spc; |
116 | // spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last)); |
117 | spc.Init(BasCurve,First,Last); |
118 | spc.SetSplitValues(mySplitValues); |
119 | spc.SetTolerance(myTolerance); |
120 | spc.SetCriterion(BasCriterion); |
121 | spc.Compute(); |
122 | mySplitValues->Clear(); |
123 | mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence(); |
124 | myStatus |= spc.myStatus; |
125 | return ; |
126 | } |
127 | |
128 | Handle(Geom_BSplineCurve) MyBSpline = Handle(Geom_BSplineCurve)::DownCast (myCurve); |
129 | if (MyBSpline.IsNull()) { |
130 | // if (ShapeUpgrade::Debug()) cout<<". curve is not a Bspline"<<endl; |
131 | return ; |
132 | } |
133 | // it is a BSplineCurve |
134 | // if (ShapeUpgrade::Debug()) cout<<". curve is a Bspline"<<endl; |
135 | |
136 | myNbCurves=1; |
137 | Standard_Integer Deg=MyBSpline->Degree(); |
138 | Standard_Integer NbKnots= MyBSpline->NbKnots(); |
139 | // if (ShapeUpgrade::Debug()) cout<<". NbKnots="<<NbKnots<<endl; |
140 | if (NbKnots <= 2) { |
141 | return; |
142 | } |
143 | // Only the internal knots are checked. |
144 | Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1, |
145 | LastInd = MyBSpline->LastUKnotIndex()-1; |
146 | for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) { |
147 | Last = mySplitValues->Value(j); |
148 | for (Standard_Integer iknot = FirstInd; 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 | 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 | |
168 | |
169 | if (corrected && newMultiplicity > 0) { |
170 | Continuity=Deg-MyBSpline->Multiplicity(iknot); |
171 | corrected = (Continuity >= myCont); |
172 | } |
173 | if (corrected) { |
174 | // at this knot, the continuity is now C1. Nothing else to do. |
175 | // if (ShapeUpgrade::Debug()) cout<<". Correction at Knot "<<iknot<<endl; |
176 | myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 ); |
177 | if(newMultiplicity == 0) { |
178 | //in case if knot is completelly removed |
179 | //it is necessary to modify last idex and decrease current knot index |
180 | LastInd = MyBSpline->LastUKnotIndex()-1; |
181 | iknot--; |
182 | } |
183 | } |
184 | else { |
185 | // impossible to force C1 within the tolerance: |
186 | // this knot will be a splitting value. |
187 | mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot)); |
188 | myNbCurves++; |
189 | // if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl; |
190 | } |
191 | } |
192 | } |
193 | First = Last; |
194 | } |
195 | |
196 | if (mySplitValues->Length() > 2) |
197 | myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1); |
198 | } |
199 | |
200 | //======================================================================= |
201 | //function : GetCurve |
202 | //purpose : |
203 | //======================================================================= |
204 | |
205 | const Handle(Geom_Curve)& ShapeUpgrade_SplitCurve3dContinuity::GetCurve() const |
206 | { |
207 | return myCurve; |
208 | } |