[occt.git] / src / BRepProj / BRepProj_Projection.cxx

// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and / or modify it
// under the terms of the GNU Lesser General Public version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <BRepProj_Projection.ixx>

#include <BRepAlgo_Section.hxx>

#include <Precision.hxx>
#include <BRepBndLib.hxx>
#include <BRepTools_TrsfModification.hxx>
#include <BRepTools_Modifier.hxx>
#include <BRepLib_MakeEdge.hxx>
#include <BRepLib_MakeWire.hxx>
#include <BRep_Tool.hxx>
#include <Bnd_Box.hxx>

#include <BRepSweep_Prism.hxx>
#include <BRepFill_Generator.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopLoc_Location.hxx>
#include <gp_Dir.hxx>
#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <gp_Trsf.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_ListOfShape.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <BRep_Builder.hxx>
#include <ShapeAnalysis_FreeBounds.hxx>

#include <Standard_NullObject.hxx>
#include <Standard_ConstructionError.hxx>

//=======================================================================
//function : DistanceOut
//purpose  : Compute the minimum distance between input shapes 
//           (using Bounding Boxes of each Shape)
//=======================================================================

static Standard_Real DistanceOut (const TopoDS_Shape& S1, const TopoDS_Shape& S2) 
{
  Bnd_Box BBox1, BBox2;
  BRepBndLib::Add(S1,BBox1);
  BRepBndLib::Add(S2,BBox2);
  return BBox1.Distance(BBox2);
}
  
//=======================================================================
//function : DistanceIn
//purpose  : Compute the maximum distance between input Shapes
//           we compute the maximum dimension of each Bounding Box and then
//           add each other with the minimum distance of shapes.
//=======================================================================

static Standard_Real DistanceIn (const TopoDS_Shape& S1, const TopoDS_Shape& S2) 
{
  Bnd_Box LBBox,SBBox;
  BRepBndLib::Add(S1,SBBox);
  BRepBndLib::Add(S2,LBBox);

  Standard_Real LXmin, LYmin, LZmin, LXmax, LYmax, LZmax, 
                SXmin, SYmin, SZmin, SXmax, SYmax, SZmax; 
  SBBox.Get(SXmin, SYmin, SZmin, 
            SXmax, SYmax, SZmax);
  LBBox.Get(LXmin, LYmin, LZmin, 
            LXmax, LYmax, LZmax);

  //Compute the max distance between input shapes------------//
  gp_XYZ Lmin(LXmin, LYmin, LZmin), 
         Lmax(LXmax, LYmax, LZmax);
  gp_XYZ Smin(SXmin, SYmin, SZmin), 
         Smax(SXmax, SYmax, SZmax);
  Lmax.Subtract(Lmin);
  Smax.Subtract(Smin);
  return Lmax.Modulus() + Smax.Modulus() + DistanceOut(S1, S2);
}

//=======================================================================
//function : BuildSection
//purpose  : Cuts theShape by theTool using BRepAlgoAPI_Section and 
//           stores result as set of connected wires and compound
//=======================================================================

void BRepProj_Projection::BuildSection (const TopoDS_Shape& theShape,
                                        const TopoDS_Shape& theTool)
{
  myIsDone = Standard_False;
  mySection.Nullify();
  myShape.Nullify();
  myItr = 0;

  // if theShape is compound, extract only faces -- section algorithm 
  // may refuse to work if e.g. vertex is present
  TopoDS_Shape aShape;
  if (theShape.ShapeType() == TopAbs_FACE ||
      theShape.ShapeType() == TopAbs_SHELL ||
      theShape.ShapeType() == TopAbs_SOLID ||
      theShape.ShapeType() == TopAbs_COMPSOLID)
    aShape = theShape;
  else if (theShape.ShapeType() == TopAbs_COMPOUND)
  {
    TopoDS_Compound C;
    BRep_Builder B;
    TopExp_Explorer exp (theShape, TopAbs_FACE);
    for (; exp.More(); exp.Next())
    {
      if ( C.IsNull() )
        B.MakeCompound (C);
      B.Add (C, exp.Current());
    }
    aShape = C;
  }
  if ( aShape.IsNull() )
    Standard_ConstructionError::Raise(__FILE__": target shape has no faces");

  // build section computing pcurves on the shape
//  BRepAlgoAPI_Section aSectionTool (aShape, theTool, Standard_False);
  BRepAlgo_Section aSectionTool (aShape, theTool, Standard_False);
  aSectionTool.Approximation (Standard_True);
  aSectionTool.ComputePCurveOn1 (Standard_True);
  aSectionTool.Build();

  // check for successful work of the section tool
  if (! aSectionTool.IsDone()) 
    return;

  // get edges of the result
  Handle(TopTools_HSequenceOfShape) anEdges = new TopTools_HSequenceOfShape;
  TopExp_Explorer exp(aSectionTool.Shape(), TopAbs_EDGE);
  for (; exp.More(); exp.Next())
    anEdges->Append (exp.Current());

  // if no edges are found, this means that this section yields no result
  if (anEdges->Length() <= 0) 
    return;

  // connect edges to wires using ShapeAnalysis functionality
  ShapeAnalysis_FreeBounds::ConnectEdgesToWires (anEdges, Precision::Confusion(), 
                                                 Standard_True, mySection);
  myIsDone = (! mySection.IsNull() && mySection->Length() > 0);

  // collect all resulting wires to compound
  if ( myIsDone )
  {
    BRep_Builder B;
    B.MakeCompound (myShape);
    for (Standard_Integer i=1; i <= mySection->Length(); i++)
      B.Add (myShape, mySection->Value(i));

    // initialize iteration (for compatibility with previous versions)
    myItr = 1;
  }
}

//=======================================================================
//function : BRepProj_Projection    
//purpose  : Cylindrical Projection
//=======================================================================

BRepProj_Projection::BRepProj_Projection(const TopoDS_Shape& Wire,
                                         const TopoDS_Shape& Shape,
                                         const gp_Dir& D)
: myIsDone(Standard_False), myItr(0) 
{
  // Check the input
  Standard_NullObject_Raise_if((Wire.IsNull() || Shape.IsNull()),__FILE__": null input shape");
  if (Wire.ShapeType() != TopAbs_EDGE && 
      Wire.ShapeType() != TopAbs_WIRE ) 
    Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge");

  // compute the "length" of the cylindrical surface to build
  Standard_Real mdis = DistanceIn(Wire, Shape);
  gp_Vec Vsup (D.XYZ() * 2 * mdis);
  gp_Vec Vinf (D.XYZ() * -mdis);

  // move the base of the cylindrical surface by translating it by -mdis
  gp_Trsf T;
  T.SetTranslation(Vinf);
  // Note: it is necessary to create copy of wire to avoid adding new pcurves into it
  Handle(BRepTools_TrsfModification) Trsf = new BRepTools_TrsfModification(T);
  BRepTools_Modifier Modif (Wire, Trsf);
  TopoDS_Shape WireBase = Modif.ModifiedShape(Wire);

  // Creation of a cylindrical surface
  BRepSweep_Prism CylSurf (WireBase, Vsup, Standard_False);

  // Perform section
  BuildSection (Shape, CylSurf.Shape());
}

//=======================================================================
//function : BRepProj_Projection
//purpose  : Conical projection
//=======================================================================

BRepProj_Projection::BRepProj_Projection (const TopoDS_Shape& Wire,
                                          const TopoDS_Shape& Shape,
                                          const gp_Pnt& P)
: myIsDone(Standard_False), myItr(0)
{
  // Check the input
  Standard_NullObject_Raise_if((Wire.IsNull() || Shape.IsNull()),__FILE__": null input shape");
  if (Wire.ShapeType() != TopAbs_EDGE && 
      Wire.ShapeType() != TopAbs_WIRE ) 
    Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge");

  // if Wire is only an edge, transform it into a Wire
  TopoDS_Wire aWire;
  if (Wire.ShapeType() == TopAbs_EDGE) 
  {
    BRep_Builder BB;
    BB.MakeWire(aWire);
    BB.Add(aWire, Wire);
  }
  else 
    aWire = TopoDS::Wire(Wire);
  
  // compute the "length" of the conical surface to build
  Standard_Real mdis = DistanceIn(Wire, Shape);

  // Initialize iterator to get first sub-shape of Wire
  TopExp_Explorer ExpWire; 
  ExpWire.Init (aWire, TopAbs_VERTEX);
  
  // get the first Point of the first sub-shape os the Wire
  gp_Pnt PC = BRep_Tool::Pnt(TopoDS::Vertex(ExpWire.Current()));
  
  // compute the ratio of the scale transformation
  Standard_Real Scale = PC.Distance(P);
  if ( Abs (Scale) < Precision::Confusion() ) 
    Standard_ConstructionError::Raise("Projection");
  Scale = 1. + mdis / Scale;
  
  // move the base of the conical surface by scaling it with ratio Scale
  // then we do a symmetric relative to a point. So we have two generators
  // for building a "semi-infinite" conic surface
  gp_Trsf T;
  T.SetScale(P, Scale);
  Handle(BRepTools_TrsfModification) Tsca = new BRepTools_TrsfModification(T);
  BRepTools_Modifier ModifScale(aWire,Tsca);
  TopoDS_Shape ShapeGen1 = ModifScale.ModifiedShape(aWire);

  T.SetMirror(P);
  Handle(BRepTools_TrsfModification) Tmir = new BRepTools_TrsfModification(T);
  BRepTools_Modifier ModifMirror(ShapeGen1,Tmir);
  TopoDS_Shape ShapeGen2 = ModifMirror.ModifiedShape(ShapeGen1);

  // Build the Ruled surface based shape
  BRepFill_Generator RuledSurf;
  RuledSurf.AddWire(TopoDS::Wire(ShapeGen1));
  RuledSurf.AddWire(TopoDS::Wire(ShapeGen2));
  RuledSurf.Perform();
  TopoDS_Shell SurfShell = RuledSurf.Shell();

  // Perform section
  BuildSection (Shape, SurfShell);
}
Commit	Line	Data
b311480e	1	// Copyright (c) 1998-1999 Matra Datavision
973c2be1	2	// Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e	3	//
973c2be1	4	// This file is part of Open CASCADE Technology software library.
b311480e	5	//
973c2be1	6	// This library is free software; you can redistribute it and / or modify it
	7	// under the terms of the GNU Lesser General Public version 2.1 as published
	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.
b311480e	11	//
973c2be1	12	// Alternatively, this file may be used under the terms of Open CASCADE
973c2be1	13	// commercial license or contractual agreement.
b311480e	14
7fd59977	15	#include <BRepProj_Projection.ixx>
	16
	17	#include <BRepAlgo_Section.hxx>
	18
	19	#include <Precision.hxx>
	20	#include <BRepBndLib.hxx>
	21	#include <BRepTools_TrsfModification.hxx>
	22	#include <BRepTools_Modifier.hxx>
	23	#include <BRepLib_MakeEdge.hxx>
	24	#include <BRepLib_MakeWire.hxx>
	25	#include <BRep_Tool.hxx>
	26	#include <Bnd_Box.hxx>
	27
	28	#include <BRepSweep_Prism.hxx>
	29	#include <BRepFill_Generator.hxx>
	30	#include <TopExp.hxx>
	31	#include <TopExp_Explorer.hxx>
	32	#include <TopLoc_Location.hxx>
	33	#include <gp_Dir.hxx>
	34	#include <gp_Pnt.hxx>
	35	#include <gp_Vec.hxx>
	36	#include <gp_Trsf.hxx>
	37	#include <TopoDS.hxx>
	38	#include <TopoDS_Iterator.hxx>
	39	#include <TopoDS_Shape.hxx>
	40	#include <TopTools_ListOfShape.hxx>
	41	#include <TopTools_ListIteratorOfListOfShape.hxx>
	42	#include <BRep_Builder.hxx>
	43	#include <ShapeAnalysis_FreeBounds.hxx>
	44
	45	#include <Standard_NullObject.hxx>
	46	#include <Standard_ConstructionError.hxx>
	47
	48	//=======================================================================
	49	//function : DistanceOut
	50	//purpose : Compute the minimum distance between input shapes
	51	// (using Bounding Boxes of each Shape)
	52	//=======================================================================
	53
	54	static Standard_Real DistanceOut (const TopoDS_Shape& S1, const TopoDS_Shape& S2)
	55	{
	56	Bnd_Box BBox1, BBox2;
	57	BRepBndLib::Add(S1,BBox1);
	58	BRepBndLib::Add(S2,BBox2);
	59	return BBox1.Distance(BBox2);
	60	}
	61
	62	//=======================================================================
	63	//function : DistanceIn
	64	//purpose : Compute the maximum distance between input Shapes
	65	// we compute the maximum dimension of each Bounding Box and then
	66	// add each other with the minimum distance of shapes.
	67	//=======================================================================
	68
	69	static Standard_Real DistanceIn (const TopoDS_Shape& S1, const TopoDS_Shape& S2)
	70	{
	71	Bnd_Box LBBox,SBBox;
	72	BRepBndLib::Add(S1,SBBox);
	73	BRepBndLib::Add(S2,LBBox);
	74
	75	Standard_Real LXmin, LYmin, LZmin, LXmax, LYmax, LZmax,
	76	SXmin, SYmin, SZmin, SXmax, SYmax, SZmax;
	77	SBBox.Get(SXmin, SYmin, SZmin,
	78	SXmax, SYmax, SZmax);
79	LBBox.Get(LXmin, LYmin, LZmin,
80	LXmax, LYmax, LZmax);
81
82	//Compute the max distance between input shapes------------//
83	gp_XYZ Lmin(LXmin, LYmin, LZmin),
84	Lmax(LXmax, LYmax, LZmax);
85	gp_XYZ Smin(SXmin, SYmin, SZmin),
86	Smax(SXmax, SYmax, SZmax);
87	Lmax.Subtract(Lmin);
88	Smax.Subtract(Smin);
89	return Lmax.Modulus() + Smax.Modulus() + DistanceOut(S1, S2);
90	}
91
92	//=======================================================================
93	//function : BuildSection
94	//purpose : Cuts theShape by theTool using BRepAlgoAPI_Section and
95	// stores result as set of connected wires and compound
96	//=======================================================================
97
98	void BRepProj_Projection::BuildSection (const TopoDS_Shape& theShape,
99	const TopoDS_Shape& theTool)
100	{
101	myIsDone = Standard_False;
102	mySection.Nullify();
103	myShape.Nullify();
104	myItr = 0;
105
106	// if theShape is compound, extract only faces -- section algorithm
107	// may refuse to work if e.g. vertex is present
108	TopoDS_Shape aShape;
109	if (theShape.ShapeType() == TopAbs_FACE \|\|
110	theShape.ShapeType() == TopAbs_SHELL \|\|
111	theShape.ShapeType() == TopAbs_SOLID \|\|
112	theShape.ShapeType() == TopAbs_COMPSOLID)
113	aShape = theShape;
114	else if (theShape.ShapeType() == TopAbs_COMPOUND)
115	{
116	TopoDS_Compound C;
117	BRep_Builder B;
118	TopExp_Explorer exp (theShape, TopAbs_FACE);
119	for (; exp.More(); exp.Next())
120	{
121	if ( C.IsNull() )
122	B.MakeCompound (C);
123	B.Add (C, exp.Current());
124	}
125	aShape = C;
126	}
127	if ( aShape.IsNull() )
128	Standard_ConstructionError::Raise(__FILE__": target shape has no faces");
129
130	// build section computing pcurves on the shape
131	// BRepAlgoAPI_Section aSectionTool (aShape, theTool, Standard_False);
132	BRepAlgo_Section aSectionTool (aShape, theTool, Standard_False);
133	aSectionTool.Approximation (Standard_True);
134	aSectionTool.ComputePCurveOn1 (Standard_True);
135	aSectionTool.Build();
136
137	// check for successful work of the section tool
138	if (! aSectionTool.IsDone())
139	return;
140
141	// get edges of the result
142	Handle(TopTools_HSequenceOfShape) anEdges = new TopTools_HSequenceOfShape;
143	TopExp_Explorer exp(aSectionTool.Shape(), TopAbs_EDGE);
144	for (; exp.More(); exp.Next())
145	anEdges->Append (exp.Current());
146
147	// if no edges are found, this means that this section yields no result
148	if (anEdges->Length() <= 0)
149	return;
150
151	// connect edges to wires using ShapeAnalysis functionality
152	ShapeAnalysis_FreeBounds::ConnectEdgesToWires (anEdges, Precision::Confusion(),
153	Standard_True, mySection);
154	myIsDone = (! mySection.IsNull() && mySection->Length() > 0);
155
156	// collect all resulting wires to compound
157	if ( myIsDone )
158	{
159	BRep_Builder B;
160	B.MakeCompound (myShape);
161	for (Standard_Integer i=1; i <= mySection->Length(); i++)
162	B.Add (myShape, mySection->Value(i));
163
164	// initialize iteration (for compatibility with previous versions)
165	myItr = 1;
166	}
167	}
168
169	//=======================================================================
170	//function : BRepProj_Projection
171	//purpose : Cylindrical Projection
172	//=======================================================================
173
174	BRepProj_Projection::BRepProj_Projection(const TopoDS_Shape& Wire,
175	const TopoDS_Shape& Shape,
176	const gp_Dir& D)
177	: myIsDone(Standard_False), myItr(0)
178	{
179	// Check the input
180	Standard_NullObject_Raise_if((Wire.IsNull() \|\| Shape.IsNull()),__FILE__": null input shape");
181	if (Wire.ShapeType() != TopAbs_EDGE &&
182	Wire.ShapeType() != TopAbs_WIRE )
183	Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge");
184
185	// compute the "length" of the cylindrical surface to build
186	Standard_Real mdis = DistanceIn(Wire, Shape);
187	gp_Vec Vsup (D.XYZ() * 2 * mdis);
188	gp_Vec Vinf (D.XYZ() * -mdis);
189
190	// move the base of the cylindrical surface by translating it by -mdis
191	gp_Trsf T;
192	T.SetTranslation(Vinf);
193	// Note: it is necessary to create copy of wire to avoid adding new pcurves into it
194	Handle(BRepTools_TrsfModification) Trsf = new BRepTools_TrsfModification(T);
195	BRepTools_Modifier Modif (Wire, Trsf);
196	TopoDS_Shape WireBase = Modif.ModifiedShape(Wire);
197
198	// Creation of a cylindrical surface
199	BRepSweep_Prism CylSurf (WireBase, Vsup, Standard_False);
200
201	// Perform section
202	BuildSection (Shape, CylSurf.Shape());
203	}
204
205	//=======================================================================
206	//function : BRepProj_Projection
207	//purpose : Conical projection
208	//=======================================================================
209
210	BRepProj_Projection::BRepProj_Projection (const TopoDS_Shape& Wire,
211	const TopoDS_Shape& Shape,
212	const gp_Pnt& P)
213	: myIsDone(Standard_False), myItr(0)
214	{
215	// Check the input
216	Standard_NullObject_Raise_if((Wire.IsNull() \|\| Shape.IsNull()),__FILE__": null input shape");
217	if (Wire.ShapeType() != TopAbs_EDGE &&
218	Wire.ShapeType() != TopAbs_WIRE )
219	Standard_ConstructionError::Raise(__FILE__": projected shape is neither wire nor edge");
220
221	// if Wire is only an edge, transform it into a Wire
222	TopoDS_Wire aWire;
223	if (Wire.ShapeType() == TopAbs_EDGE)
224	{
225	BRep_Builder BB;
226	BB.MakeWire(aWire);
227	BB.Add(aWire, Wire);
228	}
229	else
230	aWire = TopoDS::Wire(Wire);
231
232	// compute the "length" of the conical surface to build
233	Standard_Real mdis = DistanceIn(Wire, Shape);
234
235	// Initialize iterator to get first sub-shape of Wire
236	TopExp_Explorer ExpWire;
237	ExpWire.Init (aWire, TopAbs_VERTEX);
238
239	// get the first Point of the first sub-shape os the Wire
240	gp_Pnt PC = BRep_Tool::Pnt(TopoDS::Vertex(ExpWire.Current()));
241
242	// compute the ratio of the scale transformation
243	Standard_Real Scale = PC.Distance(P);
244	if ( Abs (Scale) < Precision::Confusion() )
245	Standard_ConstructionError::Raise("Projection");
246	Scale = 1. + mdis / Scale;
247
248	// move the base of the conical surface by scaling it with ratio Scale
249	// then we do a symmetric relative to a point. So we have two generators
250	// for building a "semi-infinite" conic surface
251	gp_Trsf T;
252	T.SetScale(P, Scale);
253	Handle(BRepTools_TrsfModification) Tsca = new BRepTools_TrsfModification(T);
254	BRepTools_Modifier ModifScale(aWire,Tsca);
255	TopoDS_Shape ShapeGen1 = ModifScale.ModifiedShape(aWire);
256
257	T.SetMirror(P);
258	Handle(BRepTools_TrsfModification) Tmir = new BRepTools_TrsfModification(T);
259	BRepTools_Modifier ModifMirror(ShapeGen1,Tmir);
260	TopoDS_Shape ShapeGen2 = ModifMirror.ModifiedShape(ShapeGen1);
261
262	// Build the Ruled surface based shape
263	BRepFill_Generator RuledSurf;
264	RuledSurf.AddWire(TopoDS::Wire(ShapeGen1));
265	RuledSurf.AddWire(TopoDS::Wire(ShapeGen2));
266	RuledSurf.Perform();
267	TopoDS_Shell SurfShell = RuledSurf.Shell();
268
269	// Perform section
270	BuildSection (Shape, SurfShell);
271	}