src/Geom2dConvert/Geom2dConvert_ApproxCurve.cxx

   1 // Created on: 1997-09-11
   2 // Created by: Roman BORISOV
   3 // Copyright (c) 1997-1999 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 #include <Geom2dConvert_ApproxCurve.ixx>
  18 #include <gp_Pnt2d.hxx>
  19 #include <gp_Vec2d.hxx>
  20 #include <Geom2dAdaptor_HCurve.hxx>
  21 #include <TColStd_HArray1OfReal.hxx>
  22 #include <AdvApprox_PrefAndRec.hxx>
  23 #include <AdvApprox_ApproxAFunction.hxx>
  24 #include <TColgp_Array1OfPnt2d.hxx>
  25 #include <Precision.hxx>
  26
  27 //=======================================================================
  28 //class : Geom2dConvert_ApproxCurve_Eval
  29 //purpose: evaluator class for approximation
  30 //=======================================================================
  31
  32 class Geom2dConvert_ApproxCurve_Eval : public AdvApprox_EvaluatorFunction
  33 {
  34  public:
  35   Geom2dConvert_ApproxCurve_Eval (const Handle(Adaptor2d_HCurve2d)& theFunc,
  36                                   Standard_Real First, Standard_Real Last)
  37     : fonct(theFunc) { StartEndSav[0] = First; StartEndSav[1] = Last; }
  38
  39   virtual void Evaluate (Standard_Integer *Dimension,
  40                          Standard_Real     StartEnd[2],
  41                          Standard_Real    *Parameter,
  42                          Standard_Integer *DerivativeRequest,
  43                          Standard_Real    *Result, // [Dimension]
  44                          Standard_Integer *ErrorCode);
  45
  46  private:
  47   Handle(Adaptor2d_HCurve2d) fonct;
  48   Standard_Real StartEndSav[2];
  49 };
  50
  51 void Geom2dConvert_ApproxCurve_Eval::Evaluate (Standard_Integer *Dimension,
  52                                                Standard_Real     StartEnd[2],
  53                                                Standard_Real    *Param, // Parameter at which evaluation
  54                                                Standard_Integer *Order, // Derivative Request
  55                                                Standard_Real    *Result,// [Dimension]
  56                                                Standard_Integer *ErrorCode)
  57 {
  58   *ErrorCode = 0;
  59   Standard_Real par = *Param;
  60
  61 // Dimension is incorrect
  62   if (*Dimension!=2) {
  63     *ErrorCode = 1;
  64   }
  65 // Parameter is incorrect
  66   if ( par < StartEnd[0] || par > StartEnd[1] ) {
  67     *ErrorCode = 2;
  68   }
  69   if(StartEnd[0] != StartEndSav[0] || StartEnd[1]!= StartEndSav[1])
  70     {
  71       fonct = fonct->Trim(StartEnd[0],StartEnd[1],Precision::PConfusion());
  72       StartEndSav[0]=StartEnd[0];
  73       StartEndSav[1]=StartEnd[1];
  74     }
  75
  76   gp_Pnt2d pnt;
  77   gp_Vec2d v1, v2;
  78
  79   switch (*Order) {
  80   case 0:
  81     pnt = fonct->Value(par);
  82     Result[0] = pnt.X();
  83     Result[1] = pnt.Y();
  84     break;
  85   case 1:
  86     fonct->D1(par, pnt, v1);
  87     Result[0] = v1.X();
  88     Result[1] = v1.Y();
  89     break;
  90   case 2:
  91     fonct->D2(par, pnt, v1, v2);
  92     Result[0] = v2.X();
  93     Result[1] = v2.Y();
  94     break;
  95   default:
  96     Result[0] = Result[1] = 0.;
  97     *ErrorCode = 3;
  98     break;
  99   }
 100 }
 101
 102 Geom2dConvert_ApproxCurve::Geom2dConvert_ApproxCurve(const Handle(Geom2d_Curve)& Curve,const Standard_Real Tol2d,const GeomAbs_Shape Order,const Standard_Integer MaxSegments,const Standard_Integer MaxDegree)
 103 {
 104   Handle(Geom2dAdaptor_HCurve) HCurve = new Geom2dAdaptor_HCurve (Curve);
 105   Approximate(HCurve, Tol2d, Order, MaxSegments, MaxDegree);
 106 }
 107
 108 Geom2dConvert_ApproxCurve::Geom2dConvert_ApproxCurve(const Handle(Adaptor2d_HCurve2d)& Curve,
 109                                                      const Standard_Real               Tol2d,
 110                                                      const GeomAbs_Shape               Order,
 111                                                      const Standard_Integer            MaxSegments,
 112                                                      const Standard_Integer            MaxDegree)
 113 {
 114   Approximate(Curve, Tol2d, Order, MaxSegments, MaxDegree);
 115 }
 116
 117 void Geom2dConvert_ApproxCurve::Approximate(const Handle(Adaptor2d_HCurve2d)& theCurve,
 118                                             const Standard_Real               theTol2d,
 119                                             const GeomAbs_Shape               theOrder,
 120                                             const Standard_Integer            theMaxSegments,
 121                                             const Standard_Integer            theMaxDegree)
 122 {
 123   // Initialisation of input parameters of AdvApprox
 124
 125   Standard_Integer Num1DSS=0, Num2DSS=1, Num3DSS=0;
 126   Handle(TColStd_HArray1OfReal) OneDTolNul, ThreeDTolNul;
 127   Handle(TColStd_HArray1OfReal) TwoDTol  = new TColStd_HArray1OfReal(1,Num2DSS);
 128   TwoDTol->Init(theTol2d);
 129
 130   Standard_Real First = theCurve->FirstParameter();
 131   Standard_Real Last  = theCurve->LastParameter();
 132
 133   Standard_Integer NbInterv_C2 = theCurve->NbIntervals(GeomAbs_C2);
 134   TColStd_Array1OfReal CutPnts_C2(1, NbInterv_C2+1);
 135   theCurve->Intervals(CutPnts_C2,GeomAbs_C2);
 136   Standard_Integer NbInterv_C3 = theCurve->NbIntervals(GeomAbs_C3);
 137   TColStd_Array1OfReal CutPnts_C3(1, NbInterv_C3+1);
 138   theCurve->Intervals(CutPnts_C3,GeomAbs_C3);
 139   AdvApprox_PrefAndRec CutTool(CutPnts_C2,CutPnts_C3);
 140
 141   myMaxError = 0;
 142
 143   Geom2dConvert_ApproxCurve_Eval ev (theCurve, First, Last);
 144   AdvApprox_ApproxAFunction aApprox (Num1DSS, Num2DSS, Num3DSS,
 145                                      OneDTolNul, TwoDTol, ThreeDTolNul,
 146                                      First, Last, theOrder,
 147                                      theMaxDegree, theMaxSegments,
 148                                      ev, CutTool);
 149
 150   myIsDone = aApprox.IsDone();
 151   myHasResult = aApprox.HasResult();
 152
 153   if (myHasResult) {
 154     TColgp_Array1OfPnt2d Poles(1,aApprox.NbPoles());
 155     aApprox.Poles2d(1,Poles);
 156     Handle(TColStd_HArray1OfReal)    Knots = aApprox.Knots();
 157     Handle(TColStd_HArray1OfInteger) Mults = aApprox.Multiplicities();
 158     Standard_Integer Degree = aApprox.Degree();
 159     myBSplCurve = new Geom2d_BSplineCurve(Poles, Knots->Array1(), Mults->Array1(), Degree);
 160     myMaxError = aApprox.MaxError(2, 1);
 161   }
 162 }
 163
 164  Handle(Geom2d_BSplineCurve) Geom2dConvert_ApproxCurve::Curve() const
 165 {
 166   return myBSplCurve;
 167 }
 168
 169  Standard_Boolean Geom2dConvert_ApproxCurve::IsDone() const
 170 {
 171   return myIsDone;
 172 }
 173
 174  Standard_Boolean Geom2dConvert_ApproxCurve::HasResult() const
 175 {
 176   return myHasResult;
 177 }
 178
 179  Standard_Real Geom2dConvert_ApproxCurve::MaxError() const
 180 {
 181   return myMaxError;
 182 }
 183
 184  void Geom2dConvert_ApproxCurve::Dump(Standard_OStream& o) const
 185 {
 186   o << "******* Dump of ApproxCurve *******" << endl;
 187   o << "******* Error   " << MaxError() << endl;
 188 }
 189