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// File: GccAna_Circ2d2TanRad_2.cxx
// Created: Tue Sep 24 09:12:49 1991
// Author: Remi GILET
// <reg@topsn2>
#include <GccAna_Circ2d2TanRad.jxx>
#include <gp_Circ2d.hxx>
#include <ElCLib.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Lin2d.hxx>
#include <IntAna2d_AnaIntersection.hxx>
#include <IntAna2d_IntPoint.hxx>
#include <Standard_NegativeValue.hxx>
#include <GccEnt_BadQualifier.hxx>
// circulaire tangent a un cercle et un point et de rayon donne
//=============================================================
//========================================================================
// On initialise WellDone a false. +
// On recupere le cercle C1. +
// On sort en erreur dans les cas ou la construction est impossible. +
// On fait la parallele a C1 dans le bon sens. +
// On fait le cercle centre en Point1 de rayon Radius. +
// On intersecte la parallele et le cercle. +
// ==> Le point de centre de la solution. +
// On cree la solution qu on ajoute aux solutions deja trouvees. +
// On remplit les champs. +
//========================================================================
GccAna_Circ2d2TanRad::
GccAna_Circ2d2TanRad (const GccEnt_QualifiedCirc& Qualified1 ,
const gp_Pnt2d& Point2 ,
const Standard_Real Radius ,
const Standard_Real Tolerance ):
qualifier1(1,4) ,
qualifier2(1,4),
TheSame1(1,4) ,
TheSame2(1,4) ,
cirsol(1,4) ,
pnttg1sol(1,4) ,
pnttg2sol(1,4) ,
par1sol(1,4) ,
par2sol(1,4) ,
pararg1(1,4) ,
pararg2(1,4)
{
gp_Dir2d dirx(1.0,0.0);
Standard_Real Tol = Abs(Tolerance);
NbrSol = 0;
WellDone = Standard_False;
if (!(Qualified1.IsEnclosed() || Qualified1.IsEnclosing() ||
Qualified1.IsOutside() || Qualified1.IsUnqualified())) {
GccEnt_BadQualifier::Raise();
return;
}
Standard_Integer i ;
for ( i = 1 ; i <= 4 ; i++) {
TheSame1(i) = 0;
TheSame2(i) = 0;
}
Standard_Real deport = 0.;
Standard_Integer signe = 0;
Standard_Integer nbsol = 0;
gp_Circ2d C1 = Qualified1.Qualified();
TColgp_Array1OfCirc2d C(1,4);
Standard_Real R1 = C1.Radius();
Standard_Real distance = (C1.Location()).Distance(Point2);
Standard_Real dispc1 = C1.Distance(Point2);
gp_Dir2d dir1(Point2.XY()-(C1.Location().XY()));
gp_Pnt2d center1(C1.Location());
if (Radius < 0.0) { Standard_NegativeValue::Raise(); }
else {
if ( dispc1-Radius*2.0 > Tol) { WellDone = Standard_True; }
else if (Qualified1.IsEnclosed()) {
// =================================
if ((distance-R1>Tol)||(Radius-R1>Tol)) { WellDone = Standard_True; }
else {
if (Abs(distance-R1) < Tol) {
nbsol = -1;
deport = R1-Radius;
signe = 1;
}
else {
C(1) = gp_Circ2d(C1.XAxis(),Abs(Radius-R1));
C(2) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
nbsol = 1;
}
}
}
else if (Qualified1.IsEnclosing()) {
// ==================================
if ((Tol<R1-distance)||(Tol<R1-Radius)) { WellDone = Standard_True; }
else {
if (Abs(distance-R1) < Tol) {
nbsol = -1;
deport = R1-Radius;
signe = 1;
}
else {
C(1) = gp_Circ2d(C1.XAxis(),Abs(Radius-R1));
C(2) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
nbsol = 1;
}
}
}
else if (Qualified1.IsOutside()) {
// ================================
if (Tol < R1-distance) { WellDone = Standard_True; }
else if ((Abs(distance-R1) < Tol) || (Abs(dispc1-Radius*2.0) < Tol)) {
nbsol = -1;
deport = R1+Radius;
signe = -1;
}
else {
C(1) = gp_Circ2d(C1.XAxis(),Radius+R1);
C(2) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
nbsol = 1;
}
}
else if (Qualified1.IsUnqualified()) {
// ====================================
if (Abs(dispc1-Radius*2.0) < Tol) {
WellDone = Standard_True;
gp_Pnt2d Center(center1.XY()+(distance-Radius)*dir1.XY());
cirsol(1) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
// ==================================================
if (Abs(Center.Distance(center1)-R1) < Tol) {
qualifier1(1) = GccEnt_enclosed;
}
else { qualifier1(1) = GccEnt_outside; }
qualifier2(1) = GccEnt_noqualifier;
pnttg1sol(1) = gp_Pnt2d(Center.XY()-Radius*dir1.XY());
pnttg2sol(1) = Point2;
WellDone = Standard_True;
NbrSol = 1;
}
else if ((Abs(R1-Radius)<Tol) && (Abs(distance-R1)<Tol)){
cirsol(1) = gp_Circ2d(C1);
// =========================
qualifier1(1) = GccEnt_unqualified;
qualifier2(1) = GccEnt_noqualifier;
TheSame1(1) = 1;
pnttg2sol(1) = Point2;
WellDone = Standard_True;
NbrSol = 1;
C(1) = gp_Circ2d(C1.XAxis(),Radius+R1);
C(2) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
nbsol = 1;
}
else {
C(1) = gp_Circ2d(C1.XAxis(),Abs(Radius-R1));
C(2) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
C(3) = gp_Circ2d(C1.XAxis(),Radius+R1);
C(4) = gp_Circ2d(gp_Ax2d(Point2,dirx),Radius);
nbsol = 2;
}
}
if (nbsol > 0) {
for (Standard_Integer j = 1 ; j <= nbsol ; j++) {
IntAna2d_AnaIntersection Intp(C(2*j-1),C(2*j));
if (Intp.IsDone()) {
if (!Intp.IsEmpty()) {
for (i = 1 ; i <= Intp.NbPoints() ; i++) {
NbrSol++;
gp_Pnt2d Center(Intp.Point(i).Value());
cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
// =======================================================
Standard_Real distcc1 = center1.Distance(Center);
if (!Qualified1.IsUnqualified()) {
qualifier1(NbrSol) = Qualified1.Qualifier();
}
else if (Abs(distcc1+Radius-R1) < Tol) {
qualifier1(NbrSol) = GccEnt_enclosed;
}
else if (Abs(distcc1-R1-Radius) < Tol) {
qualifier1(NbrSol) = GccEnt_outside;
}
else { qualifier1(NbrSol) = GccEnt_enclosing; }
qualifier2(NbrSol) = GccEnt_noqualifier;
dir1 = gp_Dir2d(Center.XY()-center1.XY());
#ifdef DEB
gp_Dir2d dir2(Center.XY()-Point2.XY());
#endif
if ((Center.Distance(center1) > C1.Radius()) &&
(Radius < Center.Distance(center1)+C1.Radius())) {
pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()-Radius*dir1.XY());
}
else if ((Center.Distance(center1) < C1.Radius()) &&
(Radius < C1.Radius())) {
pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dir1.XY());
}
else {
pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()-Radius*dir1.XY());
}
pnttg2sol(NbrSol) = Point2;
}
}
WellDone = Standard_True;
}
}
}
else if (nbsol < 0) {
gp_Pnt2d Center(center1.XY()+deport*dir1.XY());
cirsol(1) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
// ==================================================
qualifier1(1) = Qualified1.Qualifier();
qualifier2(1) = GccEnt_noqualifier;
if (Abs(deport) <= Tol && Abs(Radius-R1) <= Tol) {
TheSame1(1) = 1;
}
else {
pnttg1sol(1) = gp_Pnt2d(Center.XY()+signe*Radius*dir1.XY());
}
pnttg2sol(1) = Point2;
WellDone = Standard_True;
NbrSol = 1;
}
}
for (i = 1 ; i <= NbrSol ; i++) {
par1sol(i)=ElCLib::Parameter(cirsol(i),pnttg1sol(i));
if (TheSame1(i) == 0) {
pararg1(i)=ElCLib::Parameter(C1,pnttg1sol(i));
}
par2sol(i) = ElCLib::Parameter(cirsol(i),pnttg2sol(i));
pararg2(i) = 0.;
}
}
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