src/GCE2d/GCE2d_MakeArcOfCircle.cxx

   1 // Created on: 1992-10-02
   2 // Created by: Remi GILET
   3 // Copyright (c) 1992-1999 Matra Datavision
   4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
   5 //
   6 // This file is part of Open CASCADE Technology software library.
   7 //
   8 // This library is free software; you can redistribute it and/or modify it under
   9 // the terms of the GNU Lesser General Public License version 2.1 as published
  10 // by the Free Software Foundation, with special exception defined in the file
  11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
  12 // distribution for complete text of the license and disclaimer of any warranty.
  13 //
  14 // Alternatively, this file may be used under the terms of Open CASCADE
  15 // commercial license or contractual agreement.
  16
  17
  18 #include <ElCLib.hxx>
  19 #include <GCE2d_MakeArcOfCircle.hxx>
  20 #include <gce_MakeCirc2d.hxx>
  21 #include <gce_MakeLin2d.hxx>
  22 #include <Geom2d_Circle.hxx>
  23 #include <Geom2d_TrimmedCurve.hxx>
  24 #include <gp_Circ2d.hxx>
  25 #include <gp_Pnt2d.hxx>
  26 #include <gp_Vec2d.hxx>
  27 #include <IntAna2d_AnaIntersection.hxx>
  28 #include <StdFail_NotDone.hxx>
  29
  30 GCE2d_MakeArcOfCircle::GCE2d_MakeArcOfCircle(const gp_Pnt2d&        P1     ,
  31                                              const gp_Pnt2d&        P2     ,
  32                                              const gp_Pnt2d&        P3     )
  33 {
  34   gce_MakeCirc2d Cir = gce_MakeCirc2d(P1,P2,P3);
  35   TheError = Cir.Status();
  36   if (TheError == gce_Done) {
  37     gp_Circ2d C(Cir.Value());
  38     Standard_Real Alpha1 = ElCLib::Parameter(C,P1);
  39     Standard_Real Alpha2 = ElCLib::Parameter(C,P3);
  40     Handle(Geom2d_Circle) Circ = new Geom2d_Circle(C);
  41     TheArc= new Geom2d_TrimmedCurve(Circ,Alpha1,Alpha2,Standard_True);
  42   }
  43 }
  44
  45 GCE2d_MakeArcOfCircle::GCE2d_MakeArcOfCircle(const gp_Pnt2d& P1 ,
  46                                              const gp_Vec2d& V  ,
  47                                              const gp_Pnt2d& P2 )
  48 {
  49   Standard_Boolean Sense;
  50   gp_Circ2d cir;
  51   gp_Lin2d corde = gce_MakeLin2d(P1,P2);
  52   gp_Dir2d dir(corde.Direction());
  53   gp_Lin2d bis(gp_Pnt2d((P1.X()+P2.X())/2.,(P1.Y()+P2.Y())/2.),
  54                gp_Dir2d(-dir.Y(),dir.X()));
  55   gp_Lin2d norm(P1,gp_Dir2d(-V.Y(),V.X()));
  56   TheError = gce_ConfusedPoints;
  57
  58   IntAna2d_AnaIntersection Intp(bis,norm);
  59
  60   if (Intp.IsDone())
  61     {
  62       if (!Intp.IsEmpty())
  63         {
  64           gp_Pnt2d center(Intp.Point(1).Value());
  65           Standard_Real rad = (center.Distance(P1)+center.Distance(P2))/2.;
  66           cir = gce_MakeCirc2d(center,rad);
  67           TheError = gce_Done;
  68         }
  69     }
  70
  71   if (TheError == gce_Done) {
  72     Standard_Real Alpha1 = ElCLib::Parameter(cir,P1);
  73     Standard_Real Alpha2 = ElCLib::Parameter(cir,P2);
  74     Handle(Geom2d_Circle) Circ = new Geom2d_Circle(cir);
  75     gp_Vec2d vv(dir);
  76     Standard_Real cross = V^vv;
  77     Sense = cross > 0.;
  78     TheArc= new Geom2d_TrimmedCurve(Circ,Alpha1,Alpha2,Sense);
  79   }
  80 }
  81
  82 GCE2d_MakeArcOfCircle::GCE2d_MakeArcOfCircle(const gp_Circ2d&        Circ   ,
  83                                              const gp_Pnt2d&         P1     ,
  84                                              const gp_Pnt2d&         P2     ,
  85                                              const Standard_Boolean  Sense  )
  86 {
  87   Standard_Real Alpha1 = ElCLib::Parameter(Circ,P1);
  88   Standard_Real Alpha2 = ElCLib::Parameter(Circ,P2);
  89   Handle(Geom2d_Circle) C = new Geom2d_Circle(Circ);
  90   TheArc= new Geom2d_TrimmedCurve(C,Alpha1,Alpha2,Sense);
  91   TheError = gce_Done;
  92 }
  93
  94 GCE2d_MakeArcOfCircle::GCE2d_MakeArcOfCircle(const gp_Circ2d&       Circ  ,
  95                                              const gp_Pnt2d&        P     ,
  96                                              const Standard_Real    Alpha ,
  97                                              const Standard_Boolean Sense )
  98 {
  99   Standard_Real Alphafirst = ElCLib::Parameter(Circ,P);
 100   Handle(Geom2d_Circle) C = new Geom2d_Circle(Circ);
 101   TheArc= new Geom2d_TrimmedCurve(C,Alphafirst,Alpha,Sense);
 102   TheError = gce_Done;
 103 }
 104
 105 GCE2d_MakeArcOfCircle::GCE2d_MakeArcOfCircle(const gp_Circ2d&       Circ   ,
 106                                              const Standard_Real    Alpha1 ,
 107                                              const Standard_Real    Alpha2 ,
 108                                              const Standard_Boolean Sense  )
 109 {
 110   Handle(Geom2d_Circle) C = new Geom2d_Circle(Circ);
 111   TheArc= new Geom2d_TrimmedCurve(C,Alpha1,Alpha2,Sense);
 112   TheError = gce_Done;
 113 }
 114
 115 const Handle(Geom2d_TrimmedCurve)& GCE2d_MakeArcOfCircle::Value() const
 116 {
 117   StdFail_NotDone_Raise_if(TheError != gce_Done,"");
 118   return TheArc;
 119 }