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https://github.com/Open-Cascade-SAS/OCCT.git
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Integration of OCCT 6.5.0 from SVN
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bugmaster
207
src/BRepPrimAPI/BRepPrimAPI_MakeHalfSpace.cxx
Executable file
207
src/BRepPrimAPI/BRepPrimAPI_MakeHalfSpace.cxx
Executable file
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// File: BRepPrimAPI_MakeHalfSpace.cxx
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// Created: Wed Mar 8 13:47:15 1995
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// Author: Bruno DUMORTIER
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// <dub@fuegox>
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#include <BRepPrimAPI_MakeHalfSpace.ixx>
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#include <BRep_Builder.hxx>
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#include <BRepBuilderAPI_MakeVertex.hxx>
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#include <BRepExtrema_ExtPF.hxx>
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#include <BRepLProp_SLProps.hxx>
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#include <gp.hxx>
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#include <gp_Dir.hxx>
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#include <TopExp_Explorer.hxx>
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#include <TopoDS.hxx>
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#include <TopoDS_Vertex.hxx>
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#include <BRep_Tool.hxx>
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//=======================================================================
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//function : FindExtrema
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//purpose : This finction is called to find the nearest normal projection
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// of a point <aPnt> on a face <aFace>.
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// 1) return true if extrema are found.
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// 2) Set in:
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// - Dist : The lower distance found.
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// - anOppositePnt : The corresponding point laying on the face
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// - U,V : The parameters of <anOppositePnt> on the face <aFace>
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//=======================================================================
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static Standard_Real FindExtrema(const gp_Pnt& aPnt,
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const TopoDS_Face& aFace,
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Standard_Real& Dist,
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gp_Pnt& anOppositePnt,
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Standard_Real& U,
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Standard_Real& V)
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{
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Standard_Integer intvalue=0;
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Dist = RealLast();
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TopoDS_Vertex RefVertex = BRepBuilderAPI_MakeVertex(aPnt);
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BRepExtrema_ExtPF ext(RefVertex,aFace);
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if (ext.IsDone() && ext.NbExt() > 0) {
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// the point projection exist
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Standard_Integer nbext = ext.NbExt();
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for (Standard_Integer iext = 1; iext <= nbext; iext++) {
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if (ext.SquareDistance(iext) < Dist) {
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Dist = ext.SquareDistance(iext);
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intvalue = iext;
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}
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}
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Dist = sqrt(Dist);
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} else {
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// compute the min distance with the face vertices
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TopExp_Explorer explo(aFace, TopAbs_VERTEX);
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for(; explo.More(); explo.Next()) {
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const TopoDS_Vertex& vertex = TopoDS::Vertex(explo.Current());
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gp_Pnt2d param = BRep_Tool::Parameters(vertex, aFace);
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gp_Pnt Pnt = BRep_Tool::Pnt(vertex);
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Standard_Real d2 = Pnt.SquareDistance(aPnt);
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if(d2 < Dist) {
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Dist = d2;
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anOppositePnt = Pnt;
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param.Coord(U, V);
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}
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}
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Dist = sqrt(Dist);
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return Standard_True;
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}
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// Final result.
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anOppositePnt = ext.Point(intvalue);
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ext.Parameter(intvalue,U,V);
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return Standard_True;
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}
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//=======================================================================
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//function : BRepPrimAPI_MakeHalfSpace
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//purpose :
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//=======================================================================
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BRepPrimAPI_MakeHalfSpace::BRepPrimAPI_MakeHalfSpace(const TopoDS_Face& Face,
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const gp_Pnt& RefPnt)
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{
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// Set the flag is <IsDone> to False.
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NotDone();
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TopoDS_Shell Shell;
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// gp_Pnt CurPnt, MinPnt;
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gp_Pnt MinPnt;
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Standard_Real U, V;
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Standard_Real MinDist;
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if (FindExtrema(RefPnt,Face,MinDist,MinPnt,U,V)) {
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BRep_Builder myBuilder;
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myBuilder.MakeShell(Shell);
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myBuilder.Add(Shell,Face);
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// Normale, produit scalaire et sens.
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Standard_Real Prec = gp::Resolution();
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// BRepLProp_SLProps Props(BRepAdaptor_Surface(Face),U,V,2,Prec);
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BRepLProp_SLProps Props = BRepLProp_SLProps(BRepAdaptor_Surface(Face),U,V,2,Prec);
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gp_Dir Normale = Props.Normal();
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gp_Dir OppRef(RefPnt.XYZ()-MinPnt.XYZ());
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Standard_Real Sca = Normale*OppRef;
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// Construction du solide ouvert.
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myBuilder.MakeSolid(mySolid);
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if (Sca > 0.) {
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// Directions identiques: cas inverse.
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Shell.Reverse();
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}
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myBuilder.Add(mySolid,Shell);
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Done();
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}
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}
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//=======================================================================
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//function : BRepPrimAPI_MakeHalfSpace
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//purpose :
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//=======================================================================
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BRepPrimAPI_MakeHalfSpace::BRepPrimAPI_MakeHalfSpace(const TopoDS_Shell& Shell,
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const gp_Pnt& RefPnt)
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{
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// Set the flag is <IsDone> to False.
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NotDone();
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gp_Pnt CurPnt, MinPnt;
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TopoDS_Face CurFace, MinFace;
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Standard_Real MinDist = RealLast();
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Standard_Real CurDist, U, V, MinU=0, MinV=0;
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// Chercher le point de la peau le plus proche du point de reference.
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Standard_Boolean YaExt = Standard_False;
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TopoDS_Shell aShell = Shell;
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TopExp_Explorer Exp(aShell,TopAbs_FACE);
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while (Exp.More()) {
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CurFace = TopoDS::Face(Exp.Current());
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if ( FindExtrema(RefPnt,CurFace,CurDist,CurPnt,U,V)) {
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YaExt = Standard_True;
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if (CurDist < MinDist) {
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MinDist = CurDist;
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MinPnt = CurPnt;
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MinU = U;
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MinV = V;
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MinFace = CurFace;
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}
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}
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Exp.Next();
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}
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if ( YaExt) {
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// Normale, produit scalaire et sens.
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BRep_Builder myBuilder;
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Standard_Real Prec = gp::Resolution();
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// BRepLProp_SLProps Props(BRepAdaptor_Surface(MinFace),MinU,MinV,2,Prec);
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BRepLProp_SLProps Props = BRepLProp_SLProps(BRepAdaptor_Surface(MinFace),MinU,MinV,2,Prec);
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gp_Dir Normale = Props.Normal();
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gp_Dir OppRef(RefPnt.XYZ()-MinPnt.XYZ());
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Standard_Real Sca = Normale*OppRef;
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// Construction du solide ouvert.
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myBuilder.MakeSolid(mySolid);
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if (Sca > 0.) {
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// Directions identiques: cas inverse.
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aShell.Reverse();
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}
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myBuilder.Add(mySolid,aShell);
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Done();
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}
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}
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//=======================================================================
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//function : Solid
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//purpose :
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//=======================================================================
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const TopoDS_Solid& BRepPrimAPI_MakeHalfSpace::Solid() const
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{
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StdFail_NotDone_Raise_if( !IsDone(), "BRepPrimAPI_MakeHalfSpace::Solid");
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return mySolid;
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}
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//=======================================================================
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//function : TopoDS_Solid
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//purpose :
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//=======================================================================
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BRepPrimAPI_MakeHalfSpace::operator TopoDS_Solid() const
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{
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return Solid();
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}
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