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netgen/libsrc/occ/Partition_Loop2d.cxx
Joachim Schoeberl 0291271c05 B-spline curves in 2D geometry
2011-09-01 16:40:00 +00:00

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#ifdef OCCGEOMETRY
// GEOM PARTITION : partition algorithm
//
// Copyright (C) 2003 CEA/DEN, EDF R& D
//
//
//
// File : Partition_Loop2d.cxx
// Author : Benedicte MARTIN
// Module : GEOM
// $Header: /cvs/netgen/netgen/libsrc/occ/Partition_Loop2d.cxx,v 1.6 2008/03/31 14:20:28 wabro Exp $
//using namespace std;
#include <climits>
#include "Partition_Loop2d.ixx"
#include "utilities.h"
#include <stdio.h>
#include <BRepAdaptor_Curve2d.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <BRepAlgo_AsDes.hxx>
#include <BRepAlgo_FaceRestrictor.hxx>
#include <BRepOffset_DataMapOfShapeReal.hxx>
#include <BRepTopAdaptor_FClass2d.hxx>
#include <BRep_Builder.hxx>
#include <BRep_Tool.hxx>
#include <Geom2dInt_GInter.hxx>
#include <Geom2d_Curve.hxx>
#include <IntRes2d_IntersectionPoint.hxx>
#include <Precision.hxx>
#include <TColStd_MapOfInteger.hxx>
#include <TColStd_SequenceOfReal.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopTools_DataMapIteratorOfDataMapOfShapeListOfShape.hxx>
#include <TopTools_DataMapIteratorOfDataMapOfShapeShape.hxx>
#include <TopTools_DataMapOfShapeInteger.hxx>
// #include <TopTools_DataMapOfShapeReal.hxx> V6.5
#include <TopTools_DataMapOfShapeShape.hxx>
#include <TopTools_IndexedMapOfShape.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <TopTools_MapIteratorOfMapOfShape.hxx>
#include <TopTools_MapOfOrientedShape.hxx>
#include <TopTools_MapOfShape.hxx>
#include <TopTools_SequenceOfShape.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Vertex.hxx>
#include <TopoDS_Wire.hxx>
#include <gp_Pnt.hxx>
#include <gp_Pnt2d.hxx>
//=======================================================================
//function : Partition_Loop2d
//purpose :
//=======================================================================
Partition_Loop2d::Partition_Loop2d()
{
}
//=======================================================================
//function : Init
//purpose : Init with <F> the set of edges must have
// pcurves on <F>.
//=======================================================================
void Partition_Loop2d::Init(const TopoDS_Face& F)
{
myConstEdges.Clear();
myNewWires .Clear();
myNewFaces .Clear();
myFace = F;
myFaceOri = myFace.Orientation();
myFace.Orientation( TopAbs_FORWARD );
}
//=======================================================================
//function : AddConstEdge
//purpose : Add <E> as unique edge in the result.
//=======================================================================
void Partition_Loop2d::AddConstEdge (const TopoDS_Edge& E)
{
#ifdef DEB
Standard_Real f,l;
Handle(Geom2d_Curve) pc = BRep_Tool::CurveOnSurface( E, myFace, f,l);
if (pc.IsNull()) {
INFOS( "AddConstEdge(): EDGE W/O PCURVE on FACE");
} else
#endif
{
myConstEdges.Append(E);
}
}
void Partition_Loop2d::AddSectionEdge (const TopoDS_Edge& E)
{
#ifdef DEB
Standard_Real f,l;
Handle(Geom2d_Curve) pc = BRep_Tool::CurveOnSurface( E, myFace, f,l);
if (pc.IsNull())
pc = BRep_Tool::CurveOnSurface( E, myFace, f,l);
gp_Vec2d Tg1;
gp_Pnt2d PC;
pc->D1(0.5*(f+l), PC, Tg1);
if (Tg1.Magnitude() <= gp::Resolution()) {
MESSAGE ("");
}
if (pc.IsNull()) {
INFOS( "AddConstEdge(): EDGE W/O PCURVE on FACE");
} else
#endif
{
myConstEdges.Append(E);
myConstEdges.Append(E.Reversed());
mySectionEdges.Add( E );
}
}
//=======================================================================
//function : preciseU
//purpose : find u such that the 3D point on theE is just out of tolerance
// of theV
//=======================================================================
static Standard_Real preciseU (const BRepAdaptor_Surface& theSurf,
const TopoDS_Edge& theE,
const TopoDS_Vertex& theV,
const Handle(Geom2d_Curve)& theC,
const Standard_Boolean theFirstEnd)
{
Standard_Boolean isForward = ( theE.Orientation () == TopAbs_FORWARD );
if (theFirstEnd) isForward = !isForward;
// find the first point in 2d and 3d
Standard_Real f,l;
BRep_Tool::Range( theE, f, l );
Standard_Real u0 = isForward ? l : f;
gp_Pnt2d aP2d0 = theC->Value( u0 );
gp_Pnt aPnt0 = theSurf.Value( aP2d0.X(), aP2d0.Y() );
// shift in 2d and 3d
Standard_Real du = ( l - f ) / 100, du3d = 0;
if (isForward)
du = -du;
// target parameter
Standard_Real u;
while (du3d < ::RealSmall())
{
// u for test
u = u0 + du;
du *= 10; // for the next iteration: increase du untill du3d is large enough
// find out how u is far from u0 in 3D
gp_Pnt2d aP2d = theC->Value( u );
gp_Pnt aPnt = theSurf.Value( aP2d.X(), aP2d.Y() );
du3d = aPnt0.Distance( aPnt );
}
// find u such that the 3D point is just out of tolerance of theV
Standard_Real tolV = BRep_Tool::Tolerance( theV ) + Precision::Confusion();
u = u0 + du * tolV / du3d;
// check that u is within the range
if ( isForward ? (u < f) : (u > l) )
u = u0 + du;
return u;
}
//=======================================================================
//function : SelectEdge
//purpose : Find in the list <LE> the edge <NE> connected with <CE> by
// the vertex <CV>.
// <NE> is removed from the list. If <CE> is in <LE>
// with the same orientation, it's removed from the list
//=======================================================================
static Standard_Boolean SelectEdge(const BRepAdaptor_Surface& Surf,
const TopoDS_Edge& CE,
const TopoDS_Vertex& CV,
TopoDS_Edge& NE,
const TopTools_ListOfShape& LE)
{
NE.Nullify();
if (LE.Extent() > 1) {
//--------------------------------------------------------------
// Several possible edges.
// - Test the edges differents of CE
//--------------------------------------------------------------
TopoDS_Face FForward = Surf.Face();
TopoDS_Edge aPrevNE;
gp_Vec2d CTg1, Tg1, CTg2, Tg2;
gp_Pnt2d PC, P;
Standard_Real f, l;
Handle(Geom2d_Curve) Cc, C;
Cc = BRep_Tool::CurveOnSurface(CE,FForward,f,l);
Standard_Boolean isForward = ( CE.Orientation () == TopAbs_FORWARD );
Standard_Real uc, u, du = Precision::PConfusion();
uc = isForward ? ( l - du ) : ( f + du );
Cc->D1(uc, PC, CTg1);
if (!isForward) CTg1.Reverse();
Standard_Real anglemin = 3 * PI, tolAng = 1.e-8;
// select an edge whose first derivative is most left of CTg1
// ie an angle between Tg1 and CTg1 is least
TopTools_ListIteratorOfListOfShape itl;
for ( itl.Initialize(LE); itl.More(); itl.Next()) {
const TopoDS_Edge& E = TopoDS::Edge(itl.Value());
if (E.IsSame(CE))
continue;
if (! CV.IsSame( TopExp::FirstVertex( E, Standard_True )))
continue;
isForward = ( E.Orientation () == TopAbs_FORWARD );
// get E curve
C = BRep_Tool::CurveOnSurface(E,FForward,f,l);
// get the first derivative Tg1
u = isForward ? ( f + du ) : ( l - du );
C->D1(u, P, Tg1);
if (!isForward) Tg1.Reverse();
// -PI < angle < PI
Standard_Real angle = Tg1.Angle(CTg1);
if (PI - Abs(angle) <= tolAng)
{
// an angle is too close to PI; assure that an angle sign really
// reflects an edge position: +PI - an edge is worst,
// -PI - an edge is best.
u = preciseU( Surf, CE, CV, Cc, Standard_False);
gp_Vec2d CTg;
Cc->D1(u, PC, CTg);
if (CE.Orientation() == TopAbs_REVERSED) CTg.Reverse();
u = preciseU( Surf, E, CV, C, Standard_True);
C->D1(u, P, Tg1);
if (!isForward) Tg1.Reverse();
angle = Tg1.Angle(CTg);
}
Standard_Boolean isClose = ( Abs( angle - anglemin ) <= tolAng );
if (angle <= anglemin) {
if (isClose)
aPrevNE = NE;
else
aPrevNE.Nullify();
anglemin = angle ;
NE = E;
}
else
if (isClose)
aPrevNE = E;
}
if (!aPrevNE.IsNull()) {
// select one of close edges, the most left one.
Cc = BRep_Tool::CurveOnSurface( NE, FForward, f, l );
uc = preciseU( Surf, NE, CV, Cc, Standard_True);
Cc->D1(uc, PC, CTg1);
if (NE.Orientation() != TopAbs_FORWARD) CTg1.Reverse();
u = preciseU( Surf, aPrevNE, CV, C, Standard_True);
C->D1(u, P, Tg1);
if (aPrevNE.Orientation() != TopAbs_FORWARD) Tg1.Reverse();
if ( Tg1.Angle(CTg1) < 0)
NE = aPrevNE;
}
}
else if (LE.Extent() == 1) {
NE = TopoDS::Edge(LE.First());
}
else {
return Standard_False;
}
return !NE.IsNull();
}
//=======================================================================
//function : SamePnt2d
//purpose :
//=======================================================================
static Standard_Boolean SamePnt2d(const TopoDS_Vertex& V1,
const TopoDS_Edge& E1,
const TopoDS_Vertex& V2,
const TopoDS_Edge& E2,
const TopoDS_Face& F)
{
Standard_Real f1,f2,l1,l2;
Handle(Geom2d_Curve) C1 = BRep_Tool::CurveOnSurface(E1,F,f1,l1);
Handle(Geom2d_Curve) C2 = BRep_Tool::CurveOnSurface(E2,F,f2,l2);
gp_Pnt2d P1 = C1->Value( BRep_Tool::Parameter(V1,E1));
gp_Pnt2d P2 = C2->Value( BRep_Tool::Parameter(V2,E2));
Standard_Real Tol = 100 * BRep_Tool::Tolerance(V1);
Standard_Real Dist = P1.Distance(P2);
return Dist < Tol;
}
//=======================================================================
//function : StoreInMVE
//purpose :
//=======================================================================
static void StoreInMVE (const TopoDS_Face& /*F*/,
TopoDS_Edge& E,
TopTools_DataMapOfShapeListOfShape& MVE )
{
TopoDS_Vertex V1, V2;
TopTools_ListOfShape Empty;
TopExp::Vertices(E,V1,V2);
if (!MVE.IsBound(V1)) {
MVE.Bind(V1,Empty);
}
MVE(V1).Append(E);
if (!MVE.IsBound(V2)) {
MVE.Bind(V2,Empty);
}
MVE(V2).Append(E);
}
//=======================================================================
//function : RemoveFromMVE
//purpose :
//=======================================================================
static void RemoveFromMVE(const TopoDS_Edge& E,
TopTools_DataMapOfShapeListOfShape& MVE)
{
TopTools_ListIteratorOfListOfShape itl;
TopoDS_Vertex V1,V2;
TopExp::Vertices (E,V1,V2);
if (MVE.IsBound(V1))
for ( itl.Initialize(MVE(V1)); itl.More(); itl.Next()) {
if (itl.Value().IsEqual(E)) {
MVE(V1).Remove(itl);
break;
}
}
if (MVE.IsBound(V2))
for ( itl.Initialize(MVE(V2)); itl.More(); itl.Next()) {
if (itl.Value().IsEqual(E)) {
MVE(V2).Remove(itl);
break;
}
}
}
//=======================================================================
//function : addConnected
//purpose : add to <EM> all edges reachable from <E>
//=======================================================================
static void addConnected(const TopoDS_Shape& E,
TopTools_MapOfShape& EM,
TopTools_MapOfShape& VM,
const TopTools_DataMapOfShapeListOfShape& MVE)
{
// Loop on vertices of E
TopoDS_Iterator itV ( E );
for ( ; itV.More(); itV.Next()) {
if ( ! VM.Add ( itV.Value() )) continue;
// Loop on edges sharing V
TopTools_ListIteratorOfListOfShape itE( MVE( itV.Value() ) );
for (; itE.More(); itE.Next()) {
if ( EM.Add( itE.Value() ))
addConnected ( itE.Value(), EM, VM, MVE );
}
}
}
//=======================================================================
//function : canPassToOld
//purpose :
//=======================================================================
// static Standard_Boolean canPassToOld (const TopoDS_Shape& V,
// TopTools_MapOfShape& UsedShapesMap,
// const TopTools_DataMapOfShapeListOfShape& MVE,
// const TopTools_MapOfShape& SectionEdgesMap)
// {
// TopTools_ListIteratorOfListOfShape itE( MVE(V) );
// // Loop on edges sharing V
// for (; itE.More(); itE.Next()) {
// if ( !UsedShapesMap.Add( itE.Value() ))
// continue; // already checked
// if ( !SectionEdgesMap.Contains( itE.Value() ))
// return Standard_True; // WE PASSED
// TopoDS_Iterator itV( itE.Value() );
// // Loop on vertices of an edge
// for (; itV.More(); itV.Next()) {
// if ( !UsedShapesMap.Add( itV.Value() ))
// continue; // already checked
// else
// return canPassToOld( itV.Value(), UsedShapesMap, MVE, SectionEdgesMap);
// }
// }
// return Standard_False;
// }
//=======================================================================
//function : MakeDegenAndSelect
//purpose : Find parameter of intersection of <CE> with <DE> and
// select an edge with its parameter closest to found one.
// Return new degenerated edge trimming <DE> by found parameters
//=======================================================================
static TopoDS_Edge MakeDegenAndSelect(const TopoDS_Edge& CE,
const TopoDS_Vertex& CV,
TopoDS_Edge& NE,
TopTools_SequenceOfShape& EdgesSeq,
TColStd_SequenceOfReal& USeq,
const TopoDS_Edge& DE)
{
if (EdgesSeq.Length() < 3) {
if (CE == EdgesSeq.First())
NE = TopoDS::Edge( EdgesSeq.Last() );
else
NE = TopoDS::Edge( EdgesSeq.First() );
return DE;
}
// find parameter on DE where it intersects CE
Standard_Real U1;
Standard_Integer i, nb = EdgesSeq.Length();
for (i=1; i<= nb; ++i) {
if (CE == EdgesSeq(i)) {
U1 = USeq(i);
break;
}
}
// select NE with param closest to U1 thus finding U2 for a new degen edge
Standard_Real U2, dU, dUmin = 1.e100;
Standard_Boolean isReversed = ( DE.Orientation() == TopAbs_REVERSED );
for (i=1; i<= nb; ++i) {
dU = USeq(i) - U1;
if (isReversed ? (dU > 0) : (dU < 0))
continue;
dU = Abs( dU );
if ( dU > dUmin || IsEqual( dU, 0.))
continue;
const TopoDS_Edge& E = TopoDS::Edge ( EdgesSeq(i) );
if ( ! CV.IsSame( TopExp::FirstVertex( E , Standard_True )))
continue;
NE = E;
dUmin = dU + Epsilon(dU);
U2 = USeq(i);
}
// make a new degenerated edge
TopoDS_Edge NewDegen = TopoDS::Edge ( DE.EmptyCopied() );
Standard_Real Tol = BRep_Tool::Tolerance( CV );
TopoDS_Vertex V = CV;
BRep_Builder B;
V.Orientation( NewDegen.Orientation() );
B.UpdateVertex( V, U1, NewDegen, Tol);
B.Add ( NewDegen , V );
V.Reverse();
B.UpdateVertex( V, U2, NewDegen, Tol);
B.Add ( NewDegen , V );
return NewDegen;
}
//=======================================================================
//function : prepareDegen
//purpose : Intersect <DegEdge> with edges bound to its vertex in <MVE>
// and store intersection parameter on <DegEdge> in
// <USeq> as well as the edges them-self in <EdgesSeq>.
// Bind <DegEdgeIndex> to vertex of <DegEdge> in <MVDEI>
//=======================================================================
static void prepareDegen (const TopoDS_Edge& DegEdge,
const TopoDS_Face& F,
const TopTools_DataMapOfShapeListOfShape& MVE,
TopTools_SequenceOfShape& EdgesSeq,
TColStd_SequenceOfReal& USeq,
TopTools_DataMapOfShapeInteger& MVDEI,
const Standard_Integer DegEdgeIndex)
{
const TopoDS_Vertex& V = TopExp::FirstVertex ( DegEdge );
MVDEI.Bind ( V, DegEdgeIndex );
const TopTools_ListOfShape& EdgesList = MVE ( V );
// if only 2 edges come to degenerated one, no pb in selection and
// no need to intersect them, just simulate asked data
Standard_Boolean doIntersect = ( EdgesList.Extent() > 2 );
BRepAdaptor_Curve2d DC, C;
Geom2dInt_GInter InterCC;
Standard_Real Tol = Precision::PConfusion();
if ( doIntersect )
DC.Initialize( DegEdge, F );
// avoid intersecting twice the same edge
BRepOffset_DataMapOfShapeReal EUMap ( EdgesList.Extent() );
// TopTools_DataMapOfShapeReal EUMap ( EdgesList.Extent() ); // V6.5
Standard_Real U, f, l;
BRep_Tool::Range (DegEdge, f, l);
TopTools_ListIteratorOfListOfShape itE (EdgesList);
for (; itE.More(); itE.Next()) {
const TopoDS_Edge& E = TopoDS::Edge ( itE.Value() );
if ( !doIntersect) {
U = 0.; // it won't be used
}
else if ( BRep_Tool::IsClosed( E, F )) {
// seam edge: select U among f and l
Standard_Boolean first = Standard_True;
if ( V.IsSame ( TopExp::FirstVertex( E, Standard_True ) ))
first = Standard_False;
if ( DegEdge.Orientation() == TopAbs_REVERSED )
first = !first;
U = first ? f : l;
}
else if ( EUMap.IsBound( E ) ) {
// same edge already bound
U = EUMap( E );
}
else {
// intersect 2d curves
C.Initialize( E, F );
InterCC.Perform ( DC, C , Tol, Tol );
if (! InterCC.IsDone() || InterCC.NbPoints() == 0) {
MESSAGE ( "NO 2d INTERSECTION ON DEGENERATED EDGE" );
continue;
}
// hope there is only one point of intersection
U = InterCC.Point( 1 ).ParamOnFirst();
}
USeq.Append ( U );
EdgesSeq.Append ( E );
}
}
//=======================================================================
//function : Perform
//purpose : Make loops.
//=======================================================================
void Partition_Loop2d::Perform()
{
Standard_Integer NbConstEdges = myConstEdges.Extent();
TopTools_DataMapOfShapeListOfShape MVE(NbConstEdges) , MVE2(NbConstEdges);
TopTools_DataMapIteratorOfDataMapOfShapeListOfShape Mapit;
TopTools_ListIteratorOfListOfShape itl;
TopoDS_Vertex V1,V2;
BRepAdaptor_Surface Surface ( myFace, Standard_False );
// degenerated edges and parameters of their 2d intersection with other edges
TopoDS_Edge DE [2];
TopTools_SequenceOfShape SEID [2]; // seq of edges intersecting degenerated
TColStd_SequenceOfReal SeqU [2]; // n-th U corresponds to n-th edge in SEID
TopTools_DataMapOfShapeInteger MVDEI(2); // map vertex - degenerated edge index
Standard_Integer iDeg = 0; // index of degenerated edge [0,1]
//---------------------------------------------------------
// Construction map vertex => edges, find degenerated edges
//---------------------------------------------------------
for (itl.Initialize(myConstEdges); itl.More(); itl.Next()) {
TopoDS_Edge& E = TopoDS::Edge(itl.Value());
if ( BRep_Tool::Degenerated( E )) {
if (DE[0].IsNull()) DE[0] = E;
else DE[1] = E;
}
else
StoreInMVE(myFace,E,MVE);
}
// fill data for degenerated edges
if ( ! DE[0].IsNull() )
prepareDegen ( DE[0], myFace, MVE, SEID[0], SeqU[0], MVDEI, 0);
if ( ! DE[1].IsNull() )
prepareDegen ( DE[1], myFace, MVE, SEID[1], SeqU[1], MVDEI, 1);
// to detect internal wires
Standard_Boolean isInternCW = 0;
MVE2 = MVE;
//------------------------------
// Construction of all the wires
//------------------------------
// first, we collect wire edges in WEL list looking for same edges that
// will be then removed possibly exploding a wire into parts;
// second, build wire(s)
while (!MVE.IsEmpty()) {
TopoDS_Vertex VF,CV;
TopoDS_Edge CE,NE,EF;
TopoDS_Wire NW;
BRep_Builder B;
Standard_Boolean End = Standard_False;
TopTools_ListOfShape WEL;
Mapit.Initialize(MVE);
if (Mapit.Value().IsEmpty()) {
MVE.UnBind(Mapit.Key());
continue;
}
// EF first edge.
EF = CE = TopoDS::Edge(Mapit.Value().First());
// VF first vertex
VF = TopExp::FirstVertex( CE, Standard_True);
isInternCW = Standard_True;
TopTools_MapOfShape addedEM (NbConstEdges); // map of edges added to WEL
TopTools_MapOfShape doubleEM (NbConstEdges); // edges encountered twice in WEL
//-------------------------------
// Construction of a wire.
//-------------------------------
while (!End) {
// only a seam is allowed twice in a wire, the others should be removed
if (addedEM.Add ( CE ) || BRep_Tool::IsClosed( CE, myFace ) )
WEL.Append( CE );
else {
doubleEM.Add( CE );
RemoveFromMVE (CE,MVE2);
TopoDS_Edge CERev = CE;
CERev.Reverse();
RemoveFromMVE (CERev,MVE2);
}
RemoveFromMVE (CE,MVE);
CV = TopExp::LastVertex( CE, Standard_True);
if (isInternCW && !mySectionEdges.Contains(CE))
// wire is internal if all edges are section ones
isInternCW = Standard_False;
if (MVDEI.IsBound( CV )) { // CE comes to the degeneration
iDeg = MVDEI( CV );
TopoDS_Edge NewDegen;
NewDegen = MakeDegenAndSelect( CE, CV, NE, SEID[iDeg], SeqU[iDeg], DE[iDeg]);
WEL.Append( NewDegen );
CE = NE;
End = CV.IsSame( VF );
continue;
}
//--------------
// stop test
//--------------
if (MVE(CV).IsEmpty()) {
End=Standard_True;
MVE.UnBind(CV);
}
else if (CV.IsSame(VF) && SamePnt2d(CV,CE, VF,EF, myFace) ) {
End = Standard_True;
}
else {
//----------------------------
// select new current edge
//----------------------------
if (! SelectEdge (Surface,CE,CV,NE,MVE(CV))) {
MESSAGE ( " NOT CLOSED WIRE " );
End=Standard_True;
}
else
CE = NE;
}
} // while ( !End )
// WEL is built, built wire(s)
itl.Initialize( WEL );
if ( doubleEM.IsEmpty()) { // no double edges
B.MakeWire( NW );
for (; itl.More(); itl.Next())
B.Add ( NW, itl.Value());
if (isInternCW) myInternalWL.Append(NW);
else myNewWires.Append (NW);
}
else {
// remove double and degenerated edges from WEL
while (itl.More()) {
const TopoDS_Edge& E = TopoDS::Edge ( itl.Value() );
if ( doubleEM.Contains( E ) || BRep_Tool::Degenerated( E ))
WEL.Remove( itl );
else
itl.Next();
}
if ( WEL.IsEmpty())
continue;
// remove double edges from SEID and SeqU
Standard_Integer i,j;
for (j=0; j<2; ++j) {
for (i=1; i<=SEID[j].Length(); ++i) {
if (doubleEM.Contains( SEID[j].Value(i))) {
SEID[j].Remove( i );
SeqU[j].Remove( i-- );
}
}
}
// removal of doulbe edges can explode a wire into parts,
// make new wires of them.
// A Loop like previous one but without 2d check
while ( !WEL.IsEmpty() ) {
CE = TopoDS::Edge( WEL.First() );
WEL.RemoveFirst();
B.MakeWire( NW );
VF = TopExp::FirstVertex ( CE, Standard_True);
End = Standard_False;
while ( !End) {
B.Add( NW, CE );
CV = TopExp::LastVertex ( CE, Standard_True);
if (MVDEI.IsBound( CV )) { // CE comes to the degeneration
iDeg = MVDEI( CV );
TopoDS_Edge NewDegen;
NewDegen = MakeDegenAndSelect( CE, CV, NE, SEID[iDeg], SeqU[iDeg], DE[iDeg]);
B.Add( NW, NewDegen );
End = CV.IsSame( VF );
CE = NE;
if (!NE.IsNull()) { // remove NE from WEL
for (itl.Initialize( WEL ); itl.More(); itl.Next())
if ( NE == itl.Value()) {
WEL.Remove( itl );
break;
}
}
} // end degeneration
else {
if (CV.IsSame( VF )) {
End = Standard_True;
continue;
}
// edges in WEL most often are well ordered
// so try to iterate until the End
Standard_Boolean add = Standard_False;
itl.Initialize(WEL);
while ( itl.More() && !End) {
NE = TopoDS::Edge( itl.Value() );
if ( CV.IsSame( TopExp::FirstVertex( NE, Standard_True ))) {
WEL.Remove( itl );
if (add)
B.Add( NW, CE );
CE = NE;
add = Standard_True;
CV = TopExp::LastVertex( CE, Standard_True);
if (MVDEI.IsBound( CV ) || CV.IsSame( VF ))
break;
}
else
itl.Next();
}
if (!add)
End = Standard_True;
}
} // !End
myInternalWL.Append( NW );
}
} // end building new wire(s) from WEL
} // end Loop on MVE
// all wires are built
// ============================================================
// select really internal wires i.e. those from which we can`t
// pass to an old (not section) edge
// ============================================================
Standard_Integer nbIW = myInternalWL.Extent();
if (nbIW == 0)
return;
if ( myNewWires.Extent() != 1 && nbIW > 1) {
TopTools_MapOfShape outerEM (NbConstEdges); // edges connected to non-section ones
TopTools_MapOfShape visitedVM (NbConstEdges);
for ( itl.Initialize( myConstEdges ); itl.More(); itl.Next()) {
if ( ! mySectionEdges.Contains( itl.Value() ))
addConnected (itl.Value(), outerEM, visitedVM, MVE2);
}
// if an edge of a wire is in <outerEM>, the wire is not internal
TopExp_Explorer expIWE;
TopTools_ListIteratorOfListOfShape itIW ( myInternalWL );
while (itIW.More()) {
expIWE.Init ( itIW.Value() , TopAbs_EDGE );
if ( outerEM.Contains( expIWE.Current() )) {
myNewWires.Append ( itIW.Value() );
myInternalWL.Remove( itIW ); // == itIW.Next()
}
else
itIW.Next();
}
}
}
//=======================================================================
//function : isHole
//purpose :
//=======================================================================
static Standard_Boolean isHole (const TopoDS_Wire& W,
const TopoDS_Face& F)
{
BRep_Builder B;
TopoDS_Shape newFace = F.EmptyCopied();
B.Add(newFace,W.Oriented(TopAbs_FORWARD));
BRepTopAdaptor_FClass2d classif (TopoDS::Face(newFace),
Precision::PConfusion());
return (classif.PerformInfinitePoint() == TopAbs_IN);
}
//=======================================================================
//function : IsInside
//purpose : check if W1 is inside W2. Suppose W2 is not a hole !!!!
//=======================================================================
static Standard_Boolean isInside(const TopoDS_Face& F,
const TopoDS_Wire& W1,
const TopoDS_Wire& W2)
{
// make a face with wire W2
BRep_Builder B;
TopoDS_Shape aLocalShape = F.EmptyCopied();
TopoDS_Face newFace = TopoDS::Face(aLocalShape);
B.Add(newFace,W2);
// get any 2d point of W1
TopExp_Explorer exp(W1,TopAbs_EDGE);
if (BRep_Tool::Degenerated( TopoDS::Edge( exp.Current() )))
exp.Next();
const TopoDS_Edge& e = TopoDS::Edge(exp.Current());
Standard_Real f,l;
Handle(Geom2d_Curve) C2d = BRep_Tool::CurveOnSurface(e,F,f,l);
gp_Pnt2d pt2d(C2d->Value( 0.5 * ( f + l )));
BRepTopAdaptor_FClass2d classif(newFace,Precision::PConfusion());
return (classif.Perform(pt2d) == TopAbs_IN);
}
//=======================================================================
//function : NewWires
//purpose : Returns the list of wires performed.
// can be an empty list.
//=======================================================================
const TopTools_ListOfShape& Partition_Loop2d::NewWires() const
{
return myNewWires;
}
//=======================================================================
//function : NewFaces
//purpose : Returns the list of faces.
//Warning : The method <WiresToFaces> as to be called before.
// can be an empty list.
//=======================================================================
const TopTools_ListOfShape& Partition_Loop2d::NewFaces() const
{
return myNewFaces;
}
//=======================================================================
//function : findEqual
//purpose : move wires form <WL> to <EqWL> pairs of wires build of the same edges
//=======================================================================
static void findEqual (TopTools_ListOfShape& WL,
TopTools_DataMapOfShapeShape& EqWM,
const TopoDS_Face& F)
{
TopTools_ListIteratorOfListOfShape it1, it2;
Standard_Integer i,j;
TColStd_MapOfInteger IndMap;
for (it1.Initialize(WL), i=1; it1.More(); it1.Next(), i++) {
if (IndMap.Contains(i)) continue;
const TopoDS_Wire& Wire1 = TopoDS::Wire( it1.Value());
for (it2.Initialize(WL), j=1; it2.More(); it2.Next(), j++) {
if (j <= i || IndMap.Contains(j)) continue;
TopTools_IndexedMapOfShape EdgesMap;
TopExp::MapShapes (Wire1, TopAbs_EDGE, EdgesMap);
const TopoDS_Shape& Wire2 = it2.Value();
TopoDS_Iterator itE ( Wire2);
for (; itE.More(); itE.Next()) {
if ( !EdgesMap.Contains( itE.Value()) )
break;
}
if (!itE.More()) { // all edges are same
if (isHole( Wire1, F)) {
EqWM.Bind ( Wire1, Wire2 );
}
else {
EqWM.Bind ( Wire2, Wire1 );
}
IndMap.Add(i);
IndMap.Add(j);
break;
}
}
}
// clear WL
it1.Initialize(WL);
i=1;
while (it1.More()) {
if (IndMap.Contains(i))
WL.Remove(it1); // next node becomes current and with Next() we would miss it
else
it1.Next();
i++;
}
}
//=======================================================================
//function : classify
//purpose : bind to a wire a list of internal wires
//=======================================================================
static void classify(const TopTools_DataMapOfShapeShape& EqWM,
BRepAlgo_AsDes& OuterInner,
const TopoDS_Face& F)
{
TopTools_DataMapIteratorOfDataMapOfShapeShape it1, it2;
for (it1.Initialize(EqWM); it1.More(); it1.Next()) {
// find next after it1.Value()
for (it2.Initialize(EqWM); it2.More(); it2.Next())
if (it1.Value().IsSame( it2.Value() ))
{
it2.Next();
break;
}
for ( ; it2.More(); it2.Next()) {
const TopoDS_Wire& Wire1 = TopoDS::Wire( it1.Value() );
const TopoDS_Wire& Wire2 = TopoDS::Wire( it2.Value() );
if (isInside(F, Wire1, Wire2))
OuterInner.Add (Wire2, Wire1);
else if (isInside(F, Wire2, Wire1))
OuterInner.Add (Wire1, Wire2);
}
}
}
//=======================================================================
//function : WiresToFaces
//purpose : Build faces from the wires result.
// <EdgeImage> serves to find original edge by new
// one. <Section> contains edges resulting from face
// intersections
//=======================================================================
void Partition_Loop2d::WiresToFaces(const BRepAlgo_Image& )
{
Standard_Integer nbW = myNewWires.Extent() + myInternalWL.Extent();
if (nbW==0)
return;
BRepAlgo_FaceRestrictor FR;
FR.Init (myFace,Standard_False);
// FaceRestrictor is instable in rather simple cases
// (ex. a single face of bellecoque.brep splited by 10 planes:
// sometimes 1-2 faces are missing ).
// So we use it as less as possible: no holes -> make faces by hands
// are there holes in myFace ?
Standard_Boolean hasOldHoles = Standard_False;
TopoDS_Iterator itOldW (myFace);
if ( itOldW.More()) {
const TopoDS_Wire& FirstOldWire = TopoDS::Wire( itOldW.Value() );
itOldW.Next();
hasOldHoles = itOldW.More() || isHole( FirstOldWire, myFace);
}
if (myInternalWL.IsEmpty() && !hasOldHoles) {
// each wire bounds one face
BRep_Builder B;
TopTools_ListIteratorOfListOfShape itNW (myNewWires);
for (; itNW.More(); itNW.Next()) {
TopoDS_Face NF = TopoDS::Face ( myFace.EmptyCopied() );
B.Add ( NF, itNW.Value() );
NF.Orientation( myFaceOri);
myNewFaces.Append ( NF );
}
return;
}
// FaceRestrictor can't classify wires build on all the same edges
// and gives incorrect result in such cases (ex. a plane cut into 2 parts by cylinder)
// We must make faces of equal wires separately. One of equal wires makes a
// hole in a face and should come together with outer wires of face.
// The other of a wires pair bounds a face that may have holes in turn.
// Find equal wires among internal wires
TopTools_DataMapOfShapeShape EqWM; // key is a hole part of a pair of equal wires
findEqual (myInternalWL, EqWM, myFace);
if (!EqWM.IsEmpty()) { // there are equal wires
if (hasOldHoles)
myInternalWL.Append( myNewWires ); // an old wire can be inside an equal wire
// classify equal wire pairs
BRepAlgo_AsDes OuterInner;
classify (EqWM,OuterInner,myFace);
// make face of most internal of equal wires and its inner wires
while ( !EqWM.IsEmpty()) {
TopTools_ListOfShape prevHolesL; // list of hole-part of previous most internal equal wires
// find most internal wires among pairs (key - hole, value - outer part)
TopTools_DataMapIteratorOfDataMapOfShapeShape it(EqWM);
Standard_Integer nbEqW = EqWM.Extent(); // protection against infinite loop
for ( ; it.More(); it.Next()) {
TopoDS_Wire outerW = TopoDS::Wire ( it.Value() );
if ( OuterInner.HasDescendant( outerW ) && // has internal
! OuterInner.Descendant( outerW ).IsEmpty() )
continue;
FR.Add( outerW );
// add internal wires that are inside of outerW
TopTools_ListIteratorOfListOfShape itIW (myInternalWL);
while ( itIW.More()) {
TopoDS_Wire IW = TopoDS::Wire ( itIW.Value() );
if ( isInside (myFace, IW, outerW)) {
FR.Add (IW);
myInternalWL.Remove( itIW ); // == itIW.Next() !!!
}
else
itIW.Next();
}
// the hole-part of current pair of equal wires will be in the next new face
prevHolesL.Append ( it.Key() );
} // Loop on map of equal pairs searching for innermost wires
// make faces
FR.Perform();
if (FR.IsDone()) {
for (; FR.More(); FR.Next())
myNewFaces.Append(FR.Current());
}
FR.Clear();
// add hole-parts to FaceRestrictor,
// remove them from the EqWM,
// remove found wires as internal of resting classified wires
Standard_Boolean clearOuterInner = ( prevHolesL.Extent() < EqWM.Extent() );
TopTools_ListIteratorOfListOfShape itPrev (prevHolesL);
for (; itPrev.More(); itPrev.Next()) {
TopoDS_Wire& Hole = TopoDS::Wire ( itPrev.Value() );
FR.Add ( Hole );
if (clearOuterInner) {
const TopoDS_Wire& outerW = TopoDS::Wire ( EqWM.Find( Hole ) );
// Loop on wires including outerW
TopTools_ListIteratorOfListOfShape itO( OuterInner.Ascendant( outerW ));
for (; itO.More(); itO.Next()) {
TopTools_ListOfShape& innerL = OuterInner.ChangeDescendant( itO.Value() );
TopTools_ListIteratorOfListOfShape itI (innerL);
// Loop on internal wires of current including wire
for (; itI.More(); itI.Next())
if ( outerW.IsSame( itI.Value() )) {
innerL.Remove( itI ); break;
}
}
}
EqWM.UnBind ( Hole );
}
if (nbEqW == EqWM.Extent())
{
// error: pb with wires classification
#ifdef DEB
MESSAGE("Partition_Loop2d::WiresToFaces(), pb with wires classification");
#endif
break;
}
} // while (!EqWM.IsEmpty)
} // if !EqWM.IsEmpty()
myNewWires.Append ( myInternalWL );
TopTools_ListIteratorOfListOfShape itW (myNewWires);
for (; itW.More(); itW.Next()) {
TopoDS_Wire& W = TopoDS::Wire ( itW.Value() );
FR.Add(W);
}
FR.Perform();
for (; FR.IsDone() && FR.More(); FR.Next())
myNewFaces.Append(FR.Current());
TopTools_ListIteratorOfListOfShape itNF (myNewFaces);
for (; itNF.More(); itNF.Next())
itNF.Value().Orientation( myFaceOri );
}
#endif
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