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