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
  16 #include <ElCLib.hxx>
  17 #include <GccAna_Circ2d3Tan.hxx>
  18 #include <GccAna_Lin2dBisec.hxx>
  19 #include <GccAna_LinPnt2dBisec.hxx>
  20 #include <GccAna_Pnt2dBisec.hxx>
  21 #include <GccEnt_BadQualifier.hxx>
  22 #include <GccEnt_QualifiedCirc.hxx>
  23 #include <GccEnt_QualifiedLin.hxx>
  24 #include <GccInt_Bisec.hxx>
  25 #include <GccInt_IType.hxx>
  26 #include <gp_Circ2d.hxx>
  27 #include <gp_Dir2d.hxx>
  28 #include <gp_Lin2d.hxx>
  29 #include <gp_Pnt2d.hxx>
  30 #include <IntAna2d_AnaIntersection.hxx>
  31 #include <IntAna2d_Conic.hxx>
  32 #include <IntAna2d_IntPoint.hxx>
  33 #include <Precision.hxx>
  34 #include <Standard_OutOfRange.hxx>
  35 #include <StdFail_NotDone.hxx>
  36
  37 //=========================================================================
  38 //   Creation of a circle tangent to a straight line and two points.      +
  39 //=========================================================================
  40 GccAna_Circ2d3Tan::
  41    GccAna_Circ2d3Tan (const GccEnt_QualifiedLin& Qualified1,
  42                       const gp_Pnt2d&            Point2    ,
  43                       const gp_Pnt2d&            Point3    ,
  44                       const Standard_Real        Tolerance ):
  45
  46    cirsol(1,2)     ,
  47    qualifier1(1,2) ,
  48    qualifier2(1,2) ,
  49    qualifier3(1,2) ,
  50    TheSame1(1,2)   ,
  51    TheSame2(1,2)   ,
  52    TheSame3(1,2)   ,
  53    pnttg1sol(1,2)  ,
  54    pnttg2sol(1,2)  ,
  55    pnttg3sol(1,2)  ,
  56    par1sol(1,2)    ,
  57    par2sol(1,2)    ,
  58    par3sol(1,2)    ,
  59    pararg1(1,2)    ,
  60    pararg2(1,2)    ,
  61    pararg3(1,2)
  62 {
  63
  64    WellDone = Standard_False;
  65    Standard_Real Tol = Abs(Tolerance);
  66    gp_Dir2d dirx(1.0,0.0);
  67    NbrSol = 0;
  68    if (!(Qualified1.IsEnclosed() ||
  69          Qualified1.IsOutside() || Qualified1.IsUnqualified())) {
  70      GccEnt_BadQualifier::Raise();
  71      return;
  72    }
  73
  74 //=========================================================================
  75 //   Processing.                                                          +
  76 //=========================================================================
  77
  78    gp_Lin2d L1  = Qualified1.Qualified();
  79    gp_Pnt2d origin1(L1.Location());
  80    gp_Dir2d dir1(L1.Direction());
  81    gp_Dir2d normL1(-dir1.Y(),dir1.X());
  82
  83    if (Point2.IsEqual(Point3,Precision::Confusion())) {
  84      WellDone = Standard_False;
  85      return ;
  86    }
  87
  88    GccAna_Pnt2dBisec Bis1(Point2,Point3);
  89    GccAna_LinPnt2dBisec Bis2(L1,Point2);
  90    if (Bis1.IsDone() && Bis2.IsDone()) {
  91      gp_Lin2d linint1(Bis1.ThisSolution());
  92      Handle(GccInt_Bisec) Sol2 = Bis2.ThisSolution();
  93      GccInt_IType typ2 = Sol2->ArcType();
  94 #ifdef OCCT_DEBUG
  95      gp_Lin2d linintb(Bis1.ThisSolution());
  96 #else
  97      Bis1.ThisSolution() ;
  98 #endif
  99      IntAna2d_AnaIntersection Intp;
 100      if (typ2 == GccInt_Lin) {
 101        gp_Lin2d linint2(Sol2->Line());
 102        Intp.Perform (linint1,linint2);
 103      }
 104      else if (typ2 == GccInt_Par) {
 105        Intp.Perform (linint1,IntAna2d_Conic(Sol2->Parabola()));
 106      }
 107      if (Intp.IsDone()) {
 108        if ((!Intp.IsEmpty())&&(!Intp.ParallelElements())&&
 109            (!Intp.IdenticalElements())) {
 110          for (Standard_Integer j = 1 ; j <= Intp.NbPoints() ; j++) {
 111            gp_Pnt2d Center(Intp.Point(j).Value());
 112            Standard_Real dist1 = L1.Distance(Center);
 113            Standard_Real dist2 = Center.Distance(Point2);
 114
 115            Standard_Real Radius=0;
 116            Standard_Integer nbsol3 = 0;
 117            Standard_Boolean ok = Standard_False;
 118      Standard_Real  difference = (((origin1.X()-Center.X())*(-dir1.Y())) + ((origin1.Y()-Center.Y())*(dir1.X())));
 119      if ((Qualified1.IsEnclosed() && difference <= 0) ||
 120          (Qualified1.IsOutside() && difference >= 0) ||
 121          (Qualified1.IsUnqualified()))
 122      {
 123        ok = Standard_True;
 124        Radius = dist1;
 125      }
 126            if (ok) {
 127              if (Abs(dist2-Radius)<=Tol) {
 128                nbsol3 = 1;
 129              }
 130              else { ok = Standard_False; }
 131            }
 132            if (ok) {
 133              for (Standard_Integer k = 1 ; k <= nbsol3 ; k++) {
 134                NbrSol++;
 135                cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
 136 //             =======================================================
 137                gp_Dir2d dc1(origin1.XY()-Center.XY());
 138                if (!Qualified1.IsUnqualified()) {
 139                  qualifier1(NbrSol) = Qualified1.Qualifier();
 140                }
 141                else if (dc1.Dot(normL1) > 0.0) {
 142                  qualifier1(NbrSol) = GccEnt_outside;
 143                }
 144                else { qualifier1(NbrSol) = GccEnt_enclosed; }
 145                qualifier2(NbrSol) = GccEnt_noqualifier;
 146                qualifier3(NbrSol) = GccEnt_noqualifier;
 147                TheSame1(NbrSol) = 0;
 148                gp_Dir2d dc(origin1.XY()-Center.XY());
 149                Standard_Real sign = dc.Dot(gp_Dir2d(-dir1.Y(),dir1.X()));
 150                dc = gp_Dir2d(sign*gp_XY(-dir1.Y(),dir1.X()));
 151                pnttg1sol(NbrSol) = gp_Pnt2d(Center.XY()+Radius*dc.XY());
 152                par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 153                                                 pnttg1sol(NbrSol));
 154                pararg1(NbrSol)=ElCLib::Parameter(L1,pnttg1sol(NbrSol));
 155                TheSame2(NbrSol) = 0;
 156                pnttg2sol(NbrSol) = Point2;
 157                par2sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 158                                                 pnttg2sol(NbrSol));
 159                pararg2(NbrSol) = 0.;
 160                TheSame3(NbrSol) = 0;
 161                pnttg3sol(NbrSol) = Point3;
 162                par3sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol),
 163                                                 pnttg3sol(NbrSol));
 164                pararg3(NbrSol) = 0.;
 165              }
 166            }
 167          }
 168        }
 169        WellDone = Standard_True;
 170      }
 171    }
 172  }
 173