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1 | // Copyright (c) 1998-1999 Matra Datavision |
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2 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
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3 | // |
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4 | // This file is part of Open CASCADE Technology software library. |
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5 | // |
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6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
10 | // distribution for complete text of the license and disclaimer of any warranty. |
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11 | // |
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12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
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14 | |
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15 | |
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16 | #include <Bnd_Box.hxx> |
17 | #include <BRep_Builder.hxx> |
18 | #include <BRep_Tool.hxx> |
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19 | #include <BRepAlgo_Section.hxx> |
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20 | #include <BRepBndLib.hxx> |
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21 | #include <BRepFill_Generator.hxx> |
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22 | #include <BRepLib_MakeEdge.hxx> |
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23 | #include <BRepLib_MakeVertex.hxx> |
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24 | #include <BRepLib_MakeWire.hxx> |
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25 | #include <BRepProj_Projection.hxx> |
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26 | #include <BRepSweep_Prism.hxx> |
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27 | #include <BRepTools_Modifier.hxx> |
28 | #include <BRepTools_TrsfModification.hxx> |
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29 | #include <gp_Dir.hxx> |
30 | #include <gp_Pnt.hxx> |
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31 | #include <gp_Trsf.hxx> |
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32 | #include <gp_Vec.hxx> |
33 | #include <Precision.hxx> |
34 | #include <ShapeAnalysis_FreeBounds.hxx> |
35 | #include <Standard_ConstructionError.hxx> |
36 | #include <Standard_NoSuchObject.hxx> |
37 | #include <Standard_NullObject.hxx> |
38 | #include <TopExp.hxx> |
39 | #include <TopExp_Explorer.hxx> |
40 | #include <TopLoc_Location.hxx> |
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41 | #include <TopoDS.hxx> |
42 | #include <TopoDS_Iterator.hxx> |
43 | #include <TopoDS_Shape.hxx> |
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44 | #include <TopTools_ListIteratorOfListOfShape.hxx> |
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45 | #include <TopTools_ListOfShape.hxx> |
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46 | |
47 | //======================================================================= |
48 | //function : DistanceOut |
49 | //purpose : Compute the minimum distance between input shapes |
50 | // (using Bounding Boxes of each Shape) |
51 | //======================================================================= |
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52 | static Standard_Real DistanceOut (const TopoDS_Shape& S1, const TopoDS_Shape& S2) |
53 | { |
54 | Bnd_Box BBox1, BBox2; |
55 | BRepBndLib::Add(S1,BBox1); |
56 | BRepBndLib::Add(S2,BBox2); |
57 | return BBox1.Distance(BBox2); |
58 | } |
59 | |
60 | //======================================================================= |
61 | //function : DistanceIn |
62 | //purpose : Compute the maximum distance between input Shapes |
63 | // we compute the maximum dimension of each Bounding Box and then |
64 | // add each other with the minimum distance of shapes. |
65 | //======================================================================= |
66 | |
67 | static Standard_Real DistanceIn (const TopoDS_Shape& S1, const TopoDS_Shape& S2) |
68 | { |
69 | Bnd_Box LBBox,SBBox; |
70 | BRepBndLib::Add(S1,SBBox); |
71 | BRepBndLib::Add(S2,LBBox); |
72 | |
73 | Standard_Real LXmin, LYmin, LZmin, LXmax, LYmax, LZmax, |
74 | SXmin, SYmin, SZmin, SXmax, SYmax, SZmax; |
75 | SBBox.Get(SXmin, SYmin, SZmin, |
76 | SXmax, SYmax, SZmax); |
77 | LBBox.Get(LXmin, LYmin, LZmin, |
78 | LXmax, LYmax, LZmax); |
79 | |
80 | //Compute the max distance between input shapes------------// |
81 | gp_XYZ Lmin(LXmin, LYmin, LZmin), |
82 | Lmax(LXmax, LYmax, LZmax); |
83 | gp_XYZ Smin(SXmin, SYmin, SZmin), |
84 | Smax(SXmax, SYmax, SZmax); |
85 | Lmax.Subtract(Lmin); |
86 | Smax.Subtract(Smin); |
87 | return Lmax.Modulus() + Smax.Modulus() + DistanceOut(S1, S2); |
88 | } |
89 | |
90 | //======================================================================= |
91 | //function : BuildSection |
92 | //purpose : Cuts theShape by theTool using BRepAlgoAPI_Section and |
93 | // stores result as set of connected wires and compound |
94 | //======================================================================= |
95 | |
96 | void BRepProj_Projection::BuildSection (const TopoDS_Shape& theShape, |
97 | const TopoDS_Shape& theTool) |
98 | { |
99 | myIsDone = Standard_False; |
100 | mySection.Nullify(); |
101 | myShape.Nullify(); |
102 | myItr = 0; |
103 | |
104 | // if theShape is compound, extract only faces -- section algorithm |
105 | // may refuse to work if e.g. vertex is present |
106 | TopoDS_Shape aShape; |
107 | if (theShape.ShapeType() == TopAbs_FACE || |
108 | theShape.ShapeType() == TopAbs_SHELL || |
109 | theShape.ShapeType() == TopAbs_SOLID || |
110 | theShape.ShapeType() == TopAbs_COMPSOLID) |
111 | aShape = theShape; |
112 | else if (theShape.ShapeType() == TopAbs_COMPOUND) |
113 | { |
114 | TopoDS_Compound C; |
115 | BRep_Builder B; |
116 | TopExp_Explorer exp (theShape, TopAbs_FACE); |
117 | for (; exp.More(); exp.Next()) |
118 | { |
119 | if ( C.IsNull() ) |
120 | B.MakeCompound (C); |
121 | B.Add (C, exp.Current()); |
122 | } |
123 | aShape = C; |
124 | } |
125 | if ( aShape.IsNull() ) |
126 | Standard_ConstructionError::Raise(__FILE__": target shape has no faces"); |
127 | |
128 | // build section computing pcurves on the shape |
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129 | // BRepAlgoAPI_Section aSectionTool (aShape, theTool, Standard_False); |
130 | BRepAlgo_Section aSectionTool (aShape, theTool, Standard_False); |
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131 | aSectionTool.Approximation (Standard_True); |
132 | aSectionTool.ComputePCurveOn1 (Standard_True); |
133 | aSectionTool.Build(); |
134 | |
135 | // check for successful work of the section tool |
136 | if (! aSectionTool.IsDone()) |
137 | return; |
138 | |
139 | // get edges of the result |
140 | Handle(TopTools_HSequenceOfShape) anEdges = new TopTools_HSequenceOfShape; |
141 | TopExp_Explorer exp(aSectionTool.Shape(), TopAbs_EDGE); |
142 | for (; exp.More(); exp.Next()) |
143 | anEdges->Append (exp.Current()); |
144 | |
145 | // if no edges are found, this means that this section yields no result |
146 | if (anEdges->Length() <= 0) |
147 | return; |
148 | |
149 | // connect edges to wires using ShapeAnalysis functionality |
150 | ShapeAnalysis_FreeBounds::ConnectEdgesToWires (anEdges, Precision::Confusion(), |
151 | Standard_True, mySection); |
152 | myIsDone = (! mySection.IsNull() && mySection->Length() > 0); |
153 | |
154 | // collect all resulting wires to compound |
155 | if ( myIsDone ) |
156 | { |
157 | BRep_Builder B; |
158 | B.MakeCompound (myShape); |
159 | for (Standard_Integer i=1; i <= mySection->Length(); i++) |
160 | B.Add (myShape, mySection->Value(i)); |
161 | |
162 | // initialize iteration (for compatibility with previous versions) |
163 | myItr = 1; |
164 | } |
165 | } |
166 | |
167 | //======================================================================= |
168 | //function : BRepProj_Projection |
169 | //purpose : Cylindrical Projection |
170 | //======================================================================= |
171 | |
172 | BRepProj_Projection::BRepProj_Projection(const TopoDS_Shape& Wire, |
173 | const TopoDS_Shape& Shape, |
174 | const gp_Dir& D) |
175 | : myIsDone(Standard_False), myItr(0) |
176 | { |
177 | // Check the input |
178 | Standard_NullObject_Raise_if((Wire.IsNull() || Shape.IsNull()),__FILE__": null input shape"); |
179 | if (Wire.ShapeType() != TopAbs_EDGE && |
180 | Wire.ShapeType() != TopAbs_WIRE ) |
181 | Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge"); |
182 | |
183 | // compute the "length" of the cylindrical surface to build |
184 | Standard_Real mdis = DistanceIn(Wire, Shape); |
185 | gp_Vec Vsup (D.XYZ() * 2 * mdis); |
186 | gp_Vec Vinf (D.XYZ() * -mdis); |
187 | |
188 | // move the base of the cylindrical surface by translating it by -mdis |
189 | gp_Trsf T; |
190 | T.SetTranslation(Vinf); |
191 | // Note: it is necessary to create copy of wire to avoid adding new pcurves into it |
192 | Handle(BRepTools_TrsfModification) Trsf = new BRepTools_TrsfModification(T); |
193 | BRepTools_Modifier Modif (Wire, Trsf); |
194 | TopoDS_Shape WireBase = Modif.ModifiedShape(Wire); |
195 | |
196 | // Creation of a cylindrical surface |
197 | BRepSweep_Prism CylSurf (WireBase, Vsup, Standard_False); |
198 | |
199 | // Perform section |
200 | BuildSection (Shape, CylSurf.Shape()); |
201 | } |
202 | |
203 | //======================================================================= |
204 | //function : BRepProj_Projection |
205 | //purpose : Conical projection |
206 | //======================================================================= |
207 | |
208 | BRepProj_Projection::BRepProj_Projection (const TopoDS_Shape& Wire, |
209 | const TopoDS_Shape& Shape, |
210 | const gp_Pnt& P) |
211 | : myIsDone(Standard_False), myItr(0) |
212 | { |
213 | // Check the input |
214 | Standard_NullObject_Raise_if((Wire.IsNull() || Shape.IsNull()),__FILE__": null input shape"); |
215 | if (Wire.ShapeType() != TopAbs_EDGE && |
216 | Wire.ShapeType() != TopAbs_WIRE ) |
217 | Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge"); |
218 | |
219 | // if Wire is only an edge, transform it into a Wire |
220 | TopoDS_Wire aWire; |
221 | if (Wire.ShapeType() == TopAbs_EDGE) |
222 | { |
223 | BRep_Builder BB; |
224 | BB.MakeWire(aWire); |
225 | BB.Add(aWire, Wire); |
226 | } |
227 | else |
228 | aWire = TopoDS::Wire(Wire); |
229 | |
230 | // compute the "length" of the conical surface to build |
231 | Standard_Real mdis = DistanceIn(Wire, Shape); |
232 | |
233 | // Initialize iterator to get first sub-shape of Wire |
234 | TopExp_Explorer ExpWire; |
235 | ExpWire.Init (aWire, TopAbs_VERTEX); |
236 | |
237 | // get the first Point of the first sub-shape os the Wire |
238 | gp_Pnt PC = BRep_Tool::Pnt(TopoDS::Vertex(ExpWire.Current())); |
239 | |
240 | // compute the ratio of the scale transformation |
241 | Standard_Real Scale = PC.Distance(P); |
242 | if ( Abs (Scale) < Precision::Confusion() ) |
243 | Standard_ConstructionError::Raise("Projection"); |
244 | Scale = 1. + mdis / Scale; |
245 | |
246 | // move the base of the conical surface by scaling it with ratio Scale |
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247 | gp_Trsf T; |
248 | T.SetScale(P, Scale); |
249 | Handle(BRepTools_TrsfModification) Tsca = new BRepTools_TrsfModification(T); |
250 | BRepTools_Modifier ModifScale(aWire,Tsca); |
251 | TopoDS_Shape ShapeGen1 = ModifScale.ModifiedShape(aWire); |
252 | |
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253 | TopoDS_Vertex aVertex = BRepLib_MakeVertex(P); |
254 | TopoDS_Edge DegEdge; |
255 | BRep_Builder BB; |
256 | BB.MakeEdge( DegEdge ); |
257 | BB.Add( DegEdge, aVertex.Oriented(TopAbs_FORWARD) ); |
258 | BB.Add( DegEdge, aVertex.Oriented(TopAbs_REVERSED) ); |
259 | BB.Degenerated( DegEdge, Standard_True ); |
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260 | |
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261 | TopoDS_Wire DegWire; |
262 | BB.MakeWire( DegWire ); |
263 | BB.Add( DegWire, DegEdge ); |
264 | DegWire.Closed( Standard_True ); |
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265 | |
266 | // Build the Ruled surface based shape |
267 | BRepFill_Generator RuledSurf; |
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268 | RuledSurf.AddWire(DegWire); |
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269 | RuledSurf.AddWire(TopoDS::Wire(ShapeGen1)); |
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270 | RuledSurf.Perform(); |
271 | TopoDS_Shell SurfShell = RuledSurf.Shell(); |
272 | |
273 | // Perform section |
274 | BuildSection (Shape, SurfShell); |
275 | } |