src/GccAna/GccAna_Circ2d3Tan_6.cxx

   1 // Copyright (c) 1995-1999 Matra Datavision
   2 // Copyright (c) 1999-2014 OPEN CASCADE SAS
   3 //
   4 // This file is part of Open CASCADE Technology software library.
   5 //
   6 // This library is free software; you can redistribute it and / or modify it
   7 // under the terms of the GNU Lesser General Public version 2.1 as published
   8 // by the Free Software Foundation, with special exception defined in the file
   9 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
  10 // distribution for complete text of the license and disclaimer of any warranty.
  11 //
  12 // Alternatively, this file may be used under the terms of Open CASCADE
  13 // commercial license or contractual agreement.
  14
  15 #include <GccAna_Circ2d3Tan.jxx>
  16
  17 #include <ElCLib.hxx>
  18 #include <IntAna2d_AnaIntersection.hxx>
  19 #include <IntAna2d_IntPoint.hxx>
  20 #include <gp_Lin2d.hxx>
  21 #include <gp_Circ2d.hxx>
  22 #include <gp_Dir2d.hxx>
  23 #include <GccAna_LinPnt2dBisec.hxx>
  24 #include <GccAna_Lin2dBisec.hxx>
  25 #include <GccInt_IType.hxx>
  26 #include <GccInt_BLine.hxx>
  27 #include <GccInt_BParab.hxx>
  28 #include <IntAna2d_Conic.hxx>
  29 #include <GccEnt_BadQualifier.hxx>
  30
  31 //=========================================================================
  32 //   Creation of a circle tangent to two straight lines and a point.      +
  33 //=========================================================================
  34
  35 GccAna_Circ2d3Tan::
  36    GccAna_Circ2d3Tan (const GccEnt_QualifiedLin&  Qualified1 ,
  37                       const GccEnt_QualifiedLin&  Qualified2 ,
  38                       const gp_Pnt2d&             Point3     ,
  39                       const Standard_Real         Tolerance  ):
  40
  41    cirsol(1,2)     ,
  42    qualifier1(1,2) ,
  43    qualifier2(1,2) ,
  44    qualifier3(1,2) ,
  45    TheSame1(1,2)   ,
  46    TheSame2(1,2)   ,
  47    TheSame3(1,2)   ,
  48    pnttg1sol(1,2)  ,
  49    pnttg2sol(1,2)  ,
  50    pnttg3sol(1,2)  ,
  51    par1sol(1,2)    ,
  52    par2sol(1,2)    ,
  53    par3sol(1,2)    ,
  54    pararg1(1,2)    ,
  55    pararg2(1,2)    ,
  56    pararg3(1,2)
  57 {
  58
  59    gp_Dir2d dirx(1.0,0.0);
  60    WellDone = Standard_False;
  61    Standard_Real Tol = Abs(Tolerance);
  62    NbrSol = 0;
  63    if (!(Qualified1.IsEnclosed() ||
  64          Qualified1.IsOutside() || Qualified1.IsUnqualified()) ||
  65        !(Qualified2.IsEnclosed() ||
  66          Qualified2.IsOutside() || Qualified2.IsUnqualified())) {
  67      GccEnt_BadQualifier::Raise();
  68      return;
  69    }
  70
  71    pnttg3sol.Init(Point3);
  72
  73 //=========================================================================
  74 //   Processing.                                                          +
  75 //=========================================================================
  76
  77    gp_Lin2d L1  = Qualified1.Qualified();
  78    gp_Lin2d L2  = Qualified2.Qualified();
  79    gp_Pnt2d origin1(L1.Location());
  80    gp_Dir2d dir1(L1.Direction());
  81    gp_Dir2d normL1(-dir1.Y(),dir1.X());
  82    gp_Pnt2d origin2(L2.Location());
  83    gp_Dir2d dir2(L2.Direction());
  84    gp_Dir2d normL2(-dir2.Y(),dir2.X());
  85
  86    GccAna_Lin2dBisec Bis1(L1,L2);
  87    GccAna_LinPnt2dBisec Bis2(L1,Point3);
  88    if (Bis1.IsDone() && Bis2.IsDone()) {
  89      Standard_Integer nbsolution1 = Bis1.NbSolutions();
  90      Handle(GccInt_Bisec) Sol2 = Bis2.ThisSolution();
  91      for (Standard_Integer i = 1 ; i <=  nbsolution1; i++) {
  92 #ifdef DEB
  93        gp_Lin2d Sol1(Bis1.ThisSolution(i));
  94 #else
  95        Bis1.ThisSolution(i) ;
  96 #endif
  97        GccInt_IType typ2 = Sol2->ArcType();
  98        IntAna2d_AnaIntersection Intp;
  99        if (typ2 == GccInt_Lin) {
 100          Intp.Perform(Bis1.ThisSolution(i),Sol2->Line());
 101        }
 102        else if (typ2 == GccInt_Par) {
 103          Intp.Perform(Bis1.ThisSolution(i),IntAna2d_Conic(Sol2->Parabola()));
 104        }
 105        if (Intp.IsDone()) {
 106          if (!Intp.IsEmpty()) {
 107            for (Standard_Integer j = 1 ; j <= Intp.NbPoints() ; j++) {
 108              gp_Pnt2d Center(Intp.Point(j).Value());
 109              Standard_Real dist1 = L1.Distance(Center);
 110              Standard_Real dist2 = L2.Distance(Center);
 111              Standard_Real dist3 = Center.Distance(Point3);
 112              Standard_Real Radius=0;
 113              Standard_Integer nbsol1 = 0;
 114              Standard_Integer nbsol2 = 0;
 115              Standard_Integer nbsol3 = 0;
 116              Standard_Boolean ok = Standard_False;
 117              if (Qualified1.IsEnclosed()) {
 118                if ((((origin1.X()-Center.X())*(-dir1.Y()))+
 119                     ((origin1.Y()-Center.Y())*(dir1.X())))<=0){
 120                  ok = Standard_True;
 121                  nbsol1 = 1;
 122                  Radius = dist1;
 123                }
 124              }
 125              else if (Qualified1.IsOutside()) {
 126                if ((((origin1.X()-Center.X())*(-dir1.Y()))+
 127                     ((origin1.Y()-Center.Y())*(dir1.X())))>=0){
 128                  ok = Standard_True;
 129                  nbsol1 = 1;
 130                  Radius = dist1;
 131                }
 132              }
 133              else if (Qualified1.IsUnqualified()) {
 134                ok = Standard_True;
 135                nbsol1 = 1;
 136                Radius = dist1;
 137              }
 138              if (Qualified2.IsEnclosed()) {
 139                if ((((origin2.X()-Center.X())*(-dir2.Y()))+
 140                     ((origin2.Y()-Center.Y())*(dir2.X())))<=0){
 141                  if (Abs(dist2-Radius) < Tol) { nbsol2 = 1; }
 142                  else { ok = Standard_False; }
 143                }
 144              }
 145              else if (Qualified2.IsOutside() && ok) {
 146                if ((((origin2.X()-Center.X())*(-dir2.Y()))+
 147                     ((origin2.Y()-Center.Y())*(dir2.X())))>=0){
 148                  if (Abs(dist2-Radius) < Tol) { nbsol2 = 1; }
 149                  else { ok = Standard_False; }
 150                }
 151              }
 152              else if (Qualified2.IsUnqualified() && ok) {
 153                if (Abs(dist2-Radius) < Tol) { nbsol2 = 1; }
 154                else { ok = Standard_False; }
 155              }
 156              if (ok) {
 157                if (Abs(dist3-Radius) < Tol) { nbsol3 = 1; }
 158                else { ok = Standard_False; }
 159              }
 160              if (ok) {
 161                for (Standard_Integer k = 1 ; k <= nbsol3 ; k++) {
 162                  NbrSol++;
 163                  cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
 164 //               =======================================================
 165                  gp_Dir2d dc1(origin1.XY()-Center.XY());
 166                  if (!Qualified1.IsUnqualified()) {
 167                    qualifier1(NbrSol) = Qualified1.Qualifier();
 168                  }
 169                  else if (dc1.Dot(normL1) > 0.0) {
 170                    qualifier1(NbrSol) = GccEnt_outside;
 171                  }
 172                  else { qualifier1(NbrSol) = GccEnt_enclosed; }
 173                  gp_Dir2d dc2(origin2.XY()-Center.XY());
 174                  if (!Qualified2.IsUnqualified()) {
 175                    qualifier2(NbrSol) = Qualified2.Qualifier();
 176                  }
 177                  else if (dc2.Dot(normL2) > 0.0) {
 178                    qualifier2(NbrSol) = GccEnt_outside;
 179                  }
 180                  else { qualifier2(NbrSol) = GccEnt_enclosed; }
 181                  qualifier3(NbrSol) = GccEnt_noqualifier;
 182                  TheSame1(NbrSol) = 0;
 183                  gp_Dir2d dc(origin1.XY()-Center.XY());
 184                  Standard_Real sign = dc.Dot(gp_Dir2d(-dir1.Y(),dir1.X()));
 185                  dc = gp_Dir2d(sign*gp_XY(-dir1.Y(),dir1.X()));
 186                  pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dc.XY());
 187                  par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 188                                                   pnttg1sol(NbrSol));
 189                  pararg1(NbrSol)=ElCLib::Parameter(L1,pnttg1sol(NbrSol));
 190                  TheSame2(NbrSol) = 0;
 191                  dc = gp_Dir2d(origin2.XY()-Center.XY());
 192                  sign = dc.Dot(gp_Dir2d(-dir2.Y(),dir2.X()));
 193                  dc = gp_Dir2d(sign*gp_XY(-dir2.Y(),dir2.X()));
 194                  pnttg2sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dc.XY());
 195                  par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 196                                                   pnttg2sol(NbrSol));
 197                  pararg2(NbrSol)=ElCLib::Parameter(L2,pnttg2sol(NbrSol));
 198                  TheSame3(NbrSol) = 0;
 199                  par3sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 200                                                   pnttg3sol(NbrSol));
 201                  pararg3(NbrSol) = 0.;
 202                }
 203              }
 204            }
 205          }
 206          WellDone = Standard_True;
 207        }
 208      }
 209    }
 210  }
 211