[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 License 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 <Bnd_Box.hxx>
#include <BRep_Builder.hxx>
#include <BRep_Tool.hxx>
#include <BRepAlgo_Section.hxx>
#include <BRepBndLib.hxx>
#include <BRepFill_Generator.hxx>
#include <BRepLib_MakeEdge.hxx>
#include <BRepLib_MakeVertex.hxx>
#include <BRepLib_MakeWire.hxx>
#include <BRepProj_Projection.hxx>
#include <BRepSweep_Prism.hxx>
#include <BRepTools_Modifier.hxx>
#include <BRepTools_TrsfModification.hxx>
#include <gp_Dir.hxx>
#include <gp_Pnt.hxx>
#include <gp_Trsf.hxx>
#include <gp_Vec.hxx>
#include <Precision.hxx>
#include <ShapeAnalysis_FreeBounds.hxx>
#include <Standard_ConstructionError.hxx>
#include <Standard_NoSuchObject.hxx>
#include <Standard_NullObject.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopLoc_Location.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <TopTools_ListOfShape.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
  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);

  TopoDS_Vertex aVertex = BRepLib_MakeVertex(P);
  TopoDS_Edge DegEdge;
  BRep_Builder BB;
  BB.MakeEdge( DegEdge );
  BB.Add( DegEdge, aVertex.Oriented(TopAbs_FORWARD) );
  BB.Add( DegEdge, aVertex.Oriented(TopAbs_REVERSED) );
  BB.Degenerated( DegEdge, Standard_True );

  TopoDS_Wire DegWire;
  BB.MakeWire( DegWire );
  BB.Add( DegWire, DegEdge );
  DegWire.Closed( Standard_True );

  // Build the Ruled surface based shape
  BRepFill_Generator RuledSurf;
  RuledSurf.AddWire(DegWire);
  RuledSurf.AddWire(TopoDS::Wire(ShapeGen1));
  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	//
d5f74e42	6	// This library is free software; you can redistribute it and/or modify it under
d5f74e42	7	// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1	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
42cf5bc1	16	#include <Bnd_Box.hxx>
	17	#include <BRep_Builder.hxx>
	18	#include <BRep_Tool.hxx>
21cd37b4	19	#include <BRepAlgo_Section.hxx>
7fd59977	20	#include <BRepBndLib.hxx>
42cf5bc1	21	#include <BRepFill_Generator.hxx>
7fd59977	22	#include <BRepLib_MakeEdge.hxx>
42cf5bc1	23	#include <BRepLib_MakeVertex.hxx>
7fd59977	24	#include <BRepLib_MakeWire.hxx>
42cf5bc1	25	#include <BRepProj_Projection.hxx>
7fd59977	26	#include <BRepSweep_Prism.hxx>
42cf5bc1	27	#include <BRepTools_Modifier.hxx>
42cf5bc1	28	#include <BRepTools_TrsfModification.hxx>
7fd59977	29	#include <gp_Dir.hxx>
7fd59977	30	#include <gp_Pnt.hxx>
7fd59977	31	#include <gp_Trsf.hxx>
42cf5bc1	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>
7fd59977	41	#include <TopoDS.hxx>
	42	#include <TopoDS_Iterator.hxx>
	43	#include <TopoDS_Shape.hxx>
7fd59977	44	#include <TopTools_ListIteratorOfListOfShape.hxx>
42cf5bc1	45	#include <TopTools_ListOfShape.hxx>
7fd59977	46
	47	//=======================================================================
	48	//function : DistanceOut
	49	//purpose : Compute the minimum distance between input shapes
	50	// (using Bounding Boxes of each Shape)
	51	//=======================================================================
7fd59977	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
21cd37b4	129	// BRepAlgoAPI_Section aSectionTool (aShape, theTool, Standard_False);
21cd37b4	130	BRepAlgo_Section aSectionTool (aShape, theTool, Standard_False);
7fd59977	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
7fd59977	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
1f205411	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 );
da72a17c	260
1f205411	261	TopoDS_Wire DegWire;
	262	BB.MakeWire( DegWire );
	263	BB.Add( DegWire, DegEdge );
	264	DegWire.Closed( Standard_True );
7fd59977	265
	266	// Build the Ruled surface based shape
	267	BRepFill_Generator RuledSurf;
1f205411	268	RuledSurf.AddWire(DegWire);
7fd59977	269	RuledSurf.AddWire(TopoDS::Wire(ShapeGen1));
7fd59977	270	RuledSurf.Perform();
	271	TopoDS_Shell SurfShell = RuledSurf.Shell();
	272
	273	// Perform section
	274	BuildSection (Shape, SurfShell);
	275	}