src/GccAna/GccAna_Circ2d3Tan_8.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 under
   7 // the terms of the GNU Lesser General Public License 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 <GccAna_Pnt2dBisec.hxx>
  26 #include <GccInt_Bisec.hxx>
  27 #include <GccInt_IType.hxx>
  28 #include <IntAna2d_Conic.hxx>
  29 #include <GccEnt_BadQualifier.hxx>
  30 #include <Precision.hxx>
  31 //=========================================================================
  32 //   Creation of a circle tangent to a straight line and two points.      +
  33 //=========================================================================
  34
  35 GccAna_Circ2d3Tan::
  36    GccAna_Circ2d3Tan (const GccEnt_QualifiedLin& Qualified1,
  37                       const gp_Pnt2d&            Point2    ,
  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    WellDone = Standard_False;
  60    Standard_Real Tol = Abs(Tolerance);
  61    gp_Dir2d dirx(1.0,0.0);
  62    NbrSol = 0;
  63    if (!(Qualified1.IsEnclosed() ||
  64          Qualified1.IsOutside() || Qualified1.IsUnqualified())) {
  65      GccEnt_BadQualifier::Raise();
  66      return;
  67    }
  68
  69 //=========================================================================
  70 //   Processing.                                                          +
  71 //=========================================================================
  72
  73    gp_Lin2d L1  = Qualified1.Qualified();
  74    gp_Pnt2d origin1(L1.Location());
  75    gp_Dir2d dir1(L1.Direction());
  76    gp_Dir2d normL1(-dir1.Y(),dir1.X());
  77
  78    if (Point2.IsEqual(Point3,Precision::Confusion())) {
  79      WellDone = Standard_False;
  80      return ;
  81    }
  82
  83    GccAna_Pnt2dBisec Bis1(Point2,Point3);
  84    GccAna_LinPnt2dBisec Bis2(L1,Point2);
  85    if (Bis1.IsDone() && Bis2.IsDone()) {
  86      gp_Lin2d linint1(Bis1.ThisSolution());
  87      Handle(GccInt_Bisec) Sol2 = Bis2.ThisSolution();
  88      GccInt_IType typ2 = Sol2->ArcType();
  89 #ifdef OCCT_DEBUG
  90      gp_Lin2d linintb(Bis1.ThisSolution());
  91 #else
  92      Bis1.ThisSolution() ;
  93 #endif
  94      IntAna2d_AnaIntersection Intp;
  95      if (typ2 == GccInt_Lin) {
  96        gp_Lin2d linint2(Sol2->Line());
  97        Intp.Perform (linint1,linint2);
  98      }
  99      else if (typ2 == GccInt_Par) {
 100        Intp.Perform (linint1,IntAna2d_Conic(Sol2->Parabola()));
 101      }
 102      if (Intp.IsDone()) {
 103        if ((!Intp.IsEmpty())&&(!Intp.ParallelElements())&&
 104            (!Intp.IdenticalElements())) {
 105          for (Standard_Integer j = 1 ; j <= Intp.NbPoints() ; j++) {
 106            gp_Pnt2d Center(Intp.Point(j).Value());
 107            Standard_Real dist1 = L1.Distance(Center);
 108            Standard_Real dist2 = Center.Distance(Point2);
 109
 110            Standard_Real Radius=0;
 111            Standard_Integer nbsol3 = 0;
 112            Standard_Boolean ok = Standard_False;
 113      Standard_Real  difference = (((origin1.X()-Center.X())*(-dir1.Y())) + ((origin1.Y()-Center.Y())*(dir1.X())));
 114      if ((Qualified1.IsEnclosed() && difference <= 0) ||
 115          (Qualified1.IsOutside() && difference >= 0) ||
 116          (Qualified1.IsUnqualified()))
 117      {
 118        ok = Standard_True;
 119        Radius = dist1;
 120      }
 121            if (ok) {
 122              if (Abs(dist2-Radius)<=Tol) {
 123                nbsol3 = 1;
 124              }
 125              else { ok = Standard_False; }
 126            }
 127            if (ok) {
 128              for (Standard_Integer k = 1 ; k <= nbsol3 ; k++) {
 129                NbrSol++;
 130                cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
 131 //             =======================================================
 132                gp_Dir2d dc1(origin1.XY()-Center.XY());
 133                if (!Qualified1.IsUnqualified()) {
 134                  qualifier1(NbrSol) = Qualified1.Qualifier();
 135                }
 136                else if (dc1.Dot(normL1) > 0.0) {
 137                  qualifier1(NbrSol) = GccEnt_outside;
 138                }
 139                else { qualifier1(NbrSol) = GccEnt_enclosed; }
 140                qualifier2(NbrSol) = GccEnt_noqualifier;
 141                qualifier3(NbrSol) = GccEnt_noqualifier;
 142                TheSame1(NbrSol) = 0;
 143                gp_Dir2d dc(origin1.XY()-Center.XY());
 144                Standard_Real sign = dc.Dot(gp_Dir2d(-dir1.Y(),dir1.X()));
 145                dc = gp_Dir2d(sign*gp_XY(-dir1.Y(),dir1.X()));
 146                pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dc.XY());
 147                par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 148                                                 pnttg1sol(NbrSol));
 149                pararg1(NbrSol)=ElCLib::Parameter(L1,pnttg1sol(NbrSol));
 150                TheSame2(NbrSol) = 0;
 151                pnttg2sol(NbrSol) = Point2;
 152                par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 153                                                 pnttg2sol(NbrSol));
 154                pararg2(NbrSol) = 0.;
 155                TheSame3(NbrSol) = 0;
 156                pnttg3sol(NbrSol) = Point3;
 157                par3sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 158                                                 pnttg3sol(NbrSol));
 159                pararg3(NbrSol) = 0.;
 160              }
 161            }
 162          }
 163        }
 164        WellDone = Standard_True;
 165      }
 166    }
 167  }
 168