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// File: GccAna_Circ2d2TanOn_8.cxx
// Created: Thu Jan 2 15:58:06 1992
// Author: Remi GILET
// <reg@topsn3>
//=========================================================================
// Creation d un cercle tangent a deux elements : Droite. +
// Cercle. +
// Point. +
// centre sur un troisieme : Droite. +
// Cercle. +
//=========================================================================
#include <GccAna_Circ2d2TanOn.jxx>
#include <ElCLib.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Ax2d.hxx>
#include <IntAna2d_AnaIntersection.hxx>
#include <IntAna2d_IntPoint.hxx>
#include <Standard_ConstructionError.hxx>
#include <GccInt_IType.hxx>
#include <GccInt_Bisec.hxx>
#include <GccInt_BLine.hxx>
#include <GccInt_BCirc.hxx>
#include <IntAna2d_Conic.hxx>
#include <GccAna_CircPnt2dBisec.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <GccEnt_BadQualifier.hxx>
#include <Precision.hxx>
GccAna_Circ2d2TanOn::
GccAna_Circ2d2TanOn (const GccEnt_QualifiedCirc& Qualified1 ,
const gp_Pnt2d& Point2 ,
const gp_Circ2d& OnCirc ,
const Standard_Real Tolerance ):
cirsol(1,4) ,
qualifier1(1,4) ,
qualifier2(1,4),
TheSame1(1,4) ,
TheSame2(1,4) ,
pnttg1sol(1,4) ,
pnttg2sol(1,4) ,
pntcen(1,4) ,
par1sol(1,4) ,
par2sol(1,4) ,
pararg1(1,4) ,
pararg2(1,4) ,
parcen3(1,4)
{
TheSame1.Init(0);
TheSame2.Init(0);
WellDone = Standard_False;
NbrSol = 0;
if (!(Qualified1.IsEnclosed() || Qualified1.IsEnclosing() ||
Qualified1.IsOutside() || Qualified1.IsUnqualified())) {
GccEnt_BadQualifier::Raise();
return;
}
Standard_Real Tol = Abs(Tolerance);
TColStd_Array1OfReal Radius(1,2);
gp_Dir2d dirx(1.,0.);
gp_Circ2d C1 = Qualified1.Qualified();
Standard_Real R1 = C1.Radius();
gp_Pnt2d center1(C1.Location());
//=========================================================================
// Traitement des cas limites. +
//=========================================================================
Standard_Integer nbsol1 = 1;
// Standard_Integer nbsol2 = 0;
Standard_Real Ron = OnCirc.Radius();
Standard_Real distcco = OnCirc.Location().Distance(center1);
gp_Pnt2d pinterm;
gp_Dir2d dircc;
Standard_Boolean SameCenter(Standard_False);
if (!OnCirc.Location().IsEqual(center1,Precision::Confusion())) {
dircc = gp_Dir2d(OnCirc.Location().XY()-center1.XY());
pinterm = gp_Pnt2d(center1.XY()+(distcco-Ron)*dircc.XY());
Standard_Real distcc2 =pinterm.Distance(Point2);
Standard_Real distcc1 =pinterm.Distance(center1);
Standard_Real d1 = Abs(distcc2-Abs(distcc1-R1));
Standard_Real d2 = Abs(distcc2-(distcc1+R1));
if ( d1 > Tol || d2 > Tol) {
if (!SameCenter) pinterm = gp_Pnt2d(center1.XY()+(distcco+Ron)*dircc.XY());
distcc2 =pinterm.Distance(Point2);
distcc1 =pinterm.Distance(center1);
d1 = Abs(distcc2-Abs(distcc1-R1));
d2 = Abs(distcc2-(distcc1+R1));
if ( d1 > Tol || d2 > Tol ) { nbsol1 = 0; }
}
if (nbsol1 > 0) {
if (Qualified1.IsEnclosed() || Qualified1.IsOutside()) {
nbsol1 = 1;
Radius(1) = Abs(distcc1-R1);
}
else if (Qualified1.IsEnclosing()) {
nbsol1 = 1;
Radius(1) = R1+distcc1;
}
else if (Qualified1.IsUnqualified()) {
nbsol1 = 2;
Radius(1) = Abs(distcc1-R1);
Radius(2) = R1+distcc1;
}
for (Standard_Integer i = 1 ; i <= nbsol1 ; i++) {
WellDone = Standard_True;
if (!(i == 1 && SameCenter)) {
NbrSol++;
cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(pinterm,dirx),Radius(i));
// ===========================================================
gp_Dir2d dc1;
if (!SameCenter) dc1 = gp_Dir2d(center1.XY()-pinterm.XY());
if (!Qualified1.IsUnqualified()) {
qualifier1(NbrSol) = Qualified1.Qualifier();
}
else if (Abs(distcc1+Radius(i)-R1) < Tol) {
qualifier1(NbrSol) = GccEnt_enclosed;
}
else if (Abs(distcc1-R1-Radius(i)) < Tol) {
qualifier1(NbrSol) = GccEnt_outside;
}
else { qualifier1(NbrSol) = GccEnt_enclosing; }
qualifier2(NbrSol) = GccEnt_noqualifier;
if (!SameCenter)
pnttg1sol(NbrSol) = gp_Pnt2d(pinterm.XY()+Radius(i)*dc1.XY());
else
pnttg1sol(NbrSol) = gp_Pnt2d(pinterm.XY());
pnttg2sol(NbrSol) = Point2;
pntcen(NbrSol) = cirsol(NbrSol).Location();
par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),pnttg1sol(NbrSol));
pararg1(NbrSol)=ElCLib::Parameter(C1,pnttg1sol(NbrSol));
par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),pnttg2sol(NbrSol));
pararg2(NbrSol) = 0.;
parcen3(NbrSol)=ElCLib::Parameter(OnCirc,pntcen(NbrSol));
}
}
if (WellDone) { return; }
}
}
//=========================================================================
// cas general. +
//=========================================================================
GccAna_CircPnt2dBisec Bis(C1,Point2);
if (Bis.IsDone()) {
Standard_Integer nbsolution = Bis.NbSolutions();
for (Standard_Integer i = 1 ; i <= nbsolution; i++) {
Handle(GccInt_Bisec) Sol = Bis.ThisSolution(i);
GccInt_IType type = Sol->ArcType();
IntAna2d_AnaIntersection Intp;
if (type == GccInt_Lin) {
Intp.Perform(Sol->Line(),OnCirc);
}
else if (type == GccInt_Cir) {
Intp.Perform(OnCirc,Sol->Circle());
}
else if (type == GccInt_Hpr) {
Intp.Perform(OnCirc,IntAna2d_Conic(Sol->Hyperbola()));
}
else if (type == GccInt_Ell) {
Intp.Perform(OnCirc,IntAna2d_Conic(Sol->Ellipse()));
}
if (Intp.IsDone()) {
if ((!Intp.IsEmpty())&&(!Intp.ParallelElements())&&
(!Intp.IdenticalElements())) {
for (Standard_Integer j = 1 ; j <= Intp.NbPoints() ; j++) {
gp_Pnt2d Center(Intp.Point(j).Value());
Standard_Real dist1 = center1.Distance(Center);
Standard_Integer nbsol = 1;
Standard_Boolean ok = Standard_False;
if (Qualified1.IsEnclosed()) {
if (dist1-C1.Radius() <= Tol) {
ok = Standard_True;
Radius(1) = Abs(C1.Radius()-dist1);
}
}
else if (Qualified1.IsOutside()) {
if (C1.Radius()-dist1 <= Tol) {
ok = Standard_True;
Radius(1) = Abs(C1.Radius()-dist1);
}
}
else if (Qualified1.IsEnclosing()) {
ok = Standard_True;
Radius(1) = C1.Radius()+dist1;
}
else if (Qualified1.IsUnqualified()) {
ok = Standard_True;
nbsol = 2;
Radius(1) = Abs(C1.Radius()-dist1);
Radius(2) = C1.Radius()+dist1;
}
if (ok) {
for (Standard_Integer k = 1 ; k <= nbsol ; k++) {
// pop : protection contre le cas center1 == Center
if (center1.IsEqual(Center,Precision::Confusion())) {
continue;
}
if (OnCirc.Distance(Center)>Tol) {
continue;
}
if (NbrSol == 4 ) break;
NbrSol++;
cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius(k));
// ==========================================================
Standard_Real distcc1 = Center.Distance(center1);
if (!Qualified1.IsUnqualified()) {
qualifier1(NbrSol) = Qualified1.Qualifier();
}
else if (Abs(distcc1+Radius(k)-R1) < Tol) {
qualifier1(NbrSol) = GccEnt_enclosed;
}
else if (Abs(distcc1-R1-Radius(k)) < Tol) {
qualifier1(NbrSol) = GccEnt_outside;
}
else { qualifier1(NbrSol) = GccEnt_enclosing; }
qualifier2(NbrSol) = GccEnt_noqualifier;
if (distcc1 <= Tol && Abs(Radius(k)-C1.Radius()) <= Tol) {
TheSame1(NbrSol) = 1;
}
else {
TheSame1(NbrSol) = 0;
gp_Dir2d dc1(center1.XY()-Center.XY());
pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+
Radius(k)*dc1.XY());
par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
pnttg1sol(NbrSol));
pararg1(NbrSol)=ElCLib::Parameter(C1,pnttg1sol(NbrSol));
}
TheSame2(NbrSol) = 0;
pntcen(NbrSol) = Center;
pnttg2sol(NbrSol) = Point2;
pararg2(NbrSol) = 0.;
par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
pnttg2sol(NbrSol));
parcen3(NbrSol)=ElCLib::Parameter(OnCirc,pntcen(NbrSol));
}
}
}
}
WellDone = Standard_True;
}
}
}
}
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