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
  18 #include <Adaptor2d_HCurve2d.hxx>
  19 #include <AdvApprox_ApproxAFunction.hxx>
  20 #include <AdvApprox_PrefAndRec.hxx>
  21 #include <Geom2d_BSplineCurve.hxx>
  22 #include <Geom2d_Curve.hxx>
  23 #include <Geom2dAdaptor_HCurve.hxx>
  24 #include <Geom2dConvert_ApproxCurve.hxx>
  25 #include <gp_Pnt2d.hxx>
  26 #include <gp_Vec2d.hxx>
  27 #include <Precision.hxx>
  28 #include <Standard_OutOfRange.hxx>
  29 #include <TColgp_Array1OfPnt2d.hxx>
  30 #include <TColStd_HArray1OfReal.hxx>
  31
  32 //=======================================================================
  33 //class : Geom2dConvert_ApproxCurve_Eval
  34 //purpose: evaluator class for approximation
  35 //=======================================================================
  36 class Geom2dConvert_ApproxCurve_Eval : public AdvApprox_EvaluatorFunction
  37 {
  38  public:
  39   Geom2dConvert_ApproxCurve_Eval (const Handle(Adaptor2d_HCurve2d)& theFunc,
  40                                   Standard_Real First, Standard_Real Last)
  41     : fonct(theFunc) { StartEndSav[0] = First; StartEndSav[1] = Last; }
  42
  43   virtual void Evaluate (Standard_Integer *Dimension,
  44                          Standard_Real     StartEnd[2],
  45                          Standard_Real    *Parameter,
  46                          Standard_Integer *DerivativeRequest,
  47                          Standard_Real    *Result, // [Dimension]
  48                          Standard_Integer *ErrorCode);
  49
  50  private:
  51   Handle(Adaptor2d_HCurve2d) fonct;
  52   Standard_Real StartEndSav[2];
  53 };
  54
  55 void Geom2dConvert_ApproxCurve_Eval::Evaluate (Standard_Integer *Dimension,
  56                                                Standard_Real     StartEnd[2],
  57                                                Standard_Real    *Param, // Parameter at which evaluation
  58                                                Standard_Integer *Order, // Derivative Request
  59                                                Standard_Real    *Result,// [Dimension]
  60                                                Standard_Integer *ErrorCode)
  61 {
  62   *ErrorCode = 0;
  63   Standard_Real par = *Param;
  64
  65 // Dimension is incorrect
  66   if (*Dimension!=2) {
  67     *ErrorCode = 1;
  68   }
  69 // Parameter is incorrect
  70   if ( par < StartEnd[0] || par > StartEnd[1] ) {
  71     *ErrorCode = 2;
  72   }
  73   if(StartEnd[0] != StartEndSav[0] || StartEnd[1]!= StartEndSav[1])
  74     {
  75       fonct = fonct->Trim(StartEnd[0],StartEnd[1],Precision::PConfusion());
  76       StartEndSav[0]=StartEnd[0];
  77       StartEndSav[1]=StartEnd[1];
  78     }
  79
  80   gp_Pnt2d pnt;
  81   gp_Vec2d v1, v2;
  82
  83   switch (*Order) {
  84   case 0:
  85     pnt = fonct->Value(par);
  86     Result[0] = pnt.X();
  87     Result[1] = pnt.Y();
  88     break;
  89   case 1:
  90     fonct->D1(par, pnt, v1);
  91     Result[0] = v1.X();
  92     Result[1] = v1.Y();
  93     break;
  94   case 2:
  95     fonct->D2(par, pnt, v1, v2);
  96     Result[0] = v2.X();
  97     Result[1] = v2.Y();
  98     break;
  99   default:
 100     Result[0] = Result[1] = 0.;
 101     *ErrorCode = 3;
 102     break;
 103   }
 104 }
 105
 106 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)
 107 {
 108   Handle(Geom2dAdaptor_HCurve) HCurve = new Geom2dAdaptor_HCurve (Curve);
 109   Approximate(HCurve, Tol2d, Order, MaxSegments, MaxDegree);
 110 }
 111
 112 Geom2dConvert_ApproxCurve::Geom2dConvert_ApproxCurve(const Handle(Adaptor2d_HCurve2d)& Curve,
 113                                                      const Standard_Real               Tol2d,
 114                                                      const GeomAbs_Shape               Order,
 115                                                      const Standard_Integer            MaxSegments,
 116                                                      const Standard_Integer            MaxDegree)
 117 {
 118   Approximate(Curve, Tol2d, Order, MaxSegments, MaxDegree);
 119 }
 120
 121 void Geom2dConvert_ApproxCurve::Approximate(const Handle(Adaptor2d_HCurve2d)& theCurve,
 122                                             const Standard_Real               theTol2d,
 123                                             const GeomAbs_Shape               theOrder,
 124                                             const Standard_Integer            theMaxSegments,
 125                                             const Standard_Integer            theMaxDegree)
 126 {
 127   // Initialisation of input parameters of AdvApprox
 128
 129   Standard_Integer Num1DSS=0, Num2DSS=1, Num3DSS=0;
 130   Handle(TColStd_HArray1OfReal) OneDTolNul, ThreeDTolNul;
 131   Handle(TColStd_HArray1OfReal) TwoDTol  = new TColStd_HArray1OfReal(1,Num2DSS);
 132   TwoDTol->Init(theTol2d);
 133
 134   Standard_Real First = theCurve->FirstParameter();
 135   Standard_Real Last  = theCurve->LastParameter();
 136
 137   Standard_Integer NbInterv_C2 = theCurve->NbIntervals(GeomAbs_C2);
 138   TColStd_Array1OfReal CutPnts_C2(1, NbInterv_C2+1);
 139   theCurve->Intervals(CutPnts_C2,GeomAbs_C2);
 140   Standard_Integer NbInterv_C3 = theCurve->NbIntervals(GeomAbs_C3);
 141   TColStd_Array1OfReal CutPnts_C3(1, NbInterv_C3+1);
 142   theCurve->Intervals(CutPnts_C3,GeomAbs_C3);
 143   AdvApprox_PrefAndRec CutTool(CutPnts_C2,CutPnts_C3);
 144
 145   myMaxError = 0;
 146
 147   Geom2dConvert_ApproxCurve_Eval ev (theCurve, First, Last);
 148   AdvApprox_ApproxAFunction aApprox (Num1DSS, Num2DSS, Num3DSS,
 149                                      OneDTolNul, TwoDTol, ThreeDTolNul,
 150                                      First, Last, theOrder,
 151                                      theMaxDegree, theMaxSegments,
 152                                      ev, CutTool);
 153
 154   myIsDone = aApprox.IsDone();
 155   myHasResult = aApprox.HasResult();
 156
 157   if (myHasResult) {
 158     TColgp_Array1OfPnt2d Poles(1,aApprox.NbPoles());
 159     aApprox.Poles2d(1,Poles);
 160     Handle(TColStd_HArray1OfReal)    Knots = aApprox.Knots();
 161     Handle(TColStd_HArray1OfInteger) Mults = aApprox.Multiplicities();
 162     Standard_Integer Degree = aApprox.Degree();
 163     myBSplCurve = new Geom2d_BSplineCurve(Poles, Knots->Array1(), Mults->Array1(), Degree);
 164     myMaxError = aApprox.MaxError(2, 1);
 165   }
 166 }
 167
 168  Handle(Geom2d_BSplineCurve) Geom2dConvert_ApproxCurve::Curve() const
 169 {
 170   return myBSplCurve;
 171 }
 172
 173  Standard_Boolean Geom2dConvert_ApproxCurve::IsDone() const
 174 {
 175   return myIsDone;
 176 }
 177
 178  Standard_Boolean Geom2dConvert_ApproxCurve::HasResult() const
 179 {
 180   return myHasResult;
 181 }
 182
 183  Standard_Real Geom2dConvert_ApproxCurve::MaxError() const
 184 {
 185   return myMaxError;
 186 }
 187
 188  void Geom2dConvert_ApproxCurve::Dump(Standard_OStream& o) const
 189 {
 190   o << "******* Dump of ApproxCurve *******" << std::endl;
 191   o << "******* Error   " << MaxError() << std::endl;
 192 }
 193