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occt/src/BlendFunc/BlendFunc.cxx
abv d5f74e42d6 0024624: Lost word in license statement in source files 
License statement text corrected; compiler warnings caused by Bison 2.41 disabled for MSVC; a few other compiler warnings on 54-bit Windows eliminated by appropriate type cast
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// Created on: 1995-10-04
// Created by: Jacques GOUSSARD
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
// 09/09/1996 PMN Ajout des methodes GetCircle et GetTolerance.
// 30/12/1996 PMN Ajout de GetMinimalWeight
// 23/09/1997 PMN Supprimme GetCircle et GetTol (passe dans GeomFill)
#include <BlendFunc.ixx>
#include <gp_Circ.hxx>
#include <gp_Pnt.hxx>
#include <gp_Dir.hxx>
#include <gp_Ax2.hxx>
#include <TColgp_Array2OfVec.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <Geom_BSplineCurve.hxx>
#include <Geom_Circle.hxx>
#include <GeomConvert.hxx>
#include <Precision.hxx>
#include <Standard_ConstructionError.hxx>
#include <CSLib.hxx>
#include <CSLib_NormalStatus.hxx>
//=======================================================================
//function : GetShape
//purpose :
//=======================================================================
void BlendFunc::GetShape (const BlendFunc_SectionShape SShape,
const Standard_Real MaxAng,
Standard_Integer& NbPoles,
Standard_Integer& NbKnots,
Standard_Integer& Degree,
Convert_ParameterisationType& TConv)
{
switch (SShape) {
case BlendFunc_Rational:
{
Standard_Integer NbSpan =
(Standard_Integer)(Ceiling(3.*Abs(MaxAng)/2./M_PI));
NbPoles = 2*NbSpan+1;
NbKnots = NbSpan+1;
Degree = 2;
if (NbSpan == 1) {
TConv = Convert_TgtThetaOver2_1;
}
else { // QuasiAngular affin d'etre C1 (et meme beaucoup plus)
NbPoles = 7 ;
NbKnots = 2 ;
Degree = 6 ;
TConv = Convert_QuasiAngular;
}
}
break;
case BlendFunc_QuasiAngular:
{
NbPoles = 7 ;
NbKnots = 2 ;
Degree = 6 ;
TConv = Convert_QuasiAngular;
}
break;
case BlendFunc_Polynomial:
{
NbPoles = 8;
NbKnots = 2;
Degree = 7;
TConv = Convert_Polynomial;
}
break;
case BlendFunc_Linear:
{
NbPoles = 2;
NbKnots = 2;
Degree = 1;
}
break;
}
}
//=======================================================================
//function : GetMinimalWeights
//purpose : On suppose les extremum de poids sont obtenus pour les
// extremums d'angles (A verifier eventuelement pour Quasi-Angular)
//=======================================================================
void BlendFunc::GetMinimalWeights(const BlendFunc_SectionShape SShape,
const Convert_ParameterisationType TConv,
const Standard_Real MinAng,
const Standard_Real MaxAng,
TColStd_Array1OfReal& Weights)
{
switch (SShape) {
case BlendFunc_Polynomial:
case BlendFunc_Linear:
{
Weights.Init(1);
}
break;
case BlendFunc_Rational:
case BlendFunc_QuasiAngular:
{
gp_Ax2 popAx2(gp_Pnt(0, 0, 0), gp_Dir(0,0,1));
gp_Circ C (popAx2, 1);
Handle(Geom_TrimmedCurve) Sect1 =
new Geom_TrimmedCurve(new Geom_Circle(C), 0., MaxAng);
Handle(Geom_BSplineCurve) CtoBspl =
GeomConvert::CurveToBSplineCurve(Sect1, TConv);
CtoBspl->Weights(Weights);
TColStd_Array1OfReal poids (Weights.Lower(), Weights.Upper());
Standard_Real angle_min = Max(Precision::PConfusion(), MinAng);
Handle(Geom_TrimmedCurve) Sect2 =
new Geom_TrimmedCurve(new Geom_Circle(C), 0., angle_min);
CtoBspl = GeomConvert::CurveToBSplineCurve(Sect2, TConv);
CtoBspl->Weights(poids);
for (Standard_Integer ii=Weights.Lower(); ii<=Weights.Upper(); ii++) {
if (poids(ii) < Weights(ii)) {
Weights(ii) = poids(ii);
}
}
}
break;
}
}
//=======================================================================
//function : IncrementeShape
//purpose :
//=======================================================================
GeomAbs_Shape BlendFunc::NextShape (const GeomAbs_Shape S)
{
switch (S)
{
case GeomAbs_C0 : return GeomAbs_C1;
case GeomAbs_C1 : return GeomAbs_C2;
case GeomAbs_C2 : return GeomAbs_C3;
default : break;
}
return GeomAbs_CN;
}
//=======================================================================
//function : ComputeNormal
//purpose :
//=======================================================================
Standard_Boolean BlendFunc::ComputeNormal (const Handle(Adaptor3d_HSurface)& Surf,
const gp_Pnt2d& p2d, gp_Vec& Normal)
{
const Standard_Integer MaxOrder=3;
const Standard_Real U = p2d.X();
const Standard_Real V = p2d.Y();
Standard_Integer i,j;
TColgp_Array2OfVec DerSurf(0,MaxOrder+1,0,MaxOrder+1);
for(i=1;i<=MaxOrder+1;i++)
DerSurf.SetValue(i,0,Surf->DN(U,V,i,0));
for(i=0;i<=MaxOrder+1;i++)
for(j=1;j<=MaxOrder+1;j++)
DerSurf.SetValue(i,j,Surf->DN(U,V,i,j));
TColgp_Array2OfVec DerNUV(0,MaxOrder,0,MaxOrder);
for(i=0;i<=MaxOrder;i++)
for(j=0;j<=MaxOrder;j++)
DerNUV.SetValue(i,j,CSLib::DNNUV(i,j,DerSurf));
gp_Dir thenormal;
CSLib_NormalStatus stat;
Standard_Integer OrderU,OrderV;
const Standard_Real Umin = Surf->FirstUParameter();
const Standard_Real Umax = Surf->LastUParameter();
const Standard_Real Vmin = Surf->FirstVParameter();
const Standard_Real Vmax = Surf->LastVParameter(); //szv: was FirstVParameter!
CSLib::Normal(MaxOrder,DerNUV,Standard_Real(1.e-9),U,V,Umin,Umax,Vmin,Vmax,
stat,thenormal,OrderU,OrderV);
if (stat == CSLib_Defined)
{
Normal.SetXYZ(thenormal.XYZ());
return Standard_True;
}
return Standard_False;
}
//=======================================================================
//function : ComputeDNormal
//purpose :
//=======================================================================
Standard_Boolean BlendFunc::ComputeDNormal (const Handle(Adaptor3d_HSurface)& Surf,
const gp_Pnt2d& p2d, gp_Vec& Normal,
gp_Vec& DNu, gp_Vec& DNv)
{
const Standard_Integer MaxOrder=3;
const Standard_Real U = p2d.X();
const Standard_Real V = p2d.Y();
Standard_Integer i,j;
TColgp_Array2OfVec DerSurf(0,MaxOrder+1,0,MaxOrder+1);
for(i=1;i<=MaxOrder+1;i++)
DerSurf.SetValue(i,0,Surf->DN(U,V,i,0));
for(i=0;i<=MaxOrder+1;i++)
for(j=1;j<=MaxOrder+1;j++)
DerSurf.SetValue(i,j,Surf->DN(U,V,i,j));
TColgp_Array2OfVec DerNUV(0,MaxOrder,0,MaxOrder);
for(i=0;i<=MaxOrder;i++)
for(j=0;j<=MaxOrder;j++)
DerNUV.SetValue(i,j,CSLib::DNNUV(i,j,DerSurf));
gp_Dir thenormal;
CSLib_NormalStatus stat;
Standard_Integer OrderU,OrderV;
const Standard_Real Umin = Surf->FirstUParameter();
const Standard_Real Umax = Surf->LastUParameter();
const Standard_Real Vmin = Surf->FirstVParameter();
const Standard_Real Vmax = Surf->LastVParameter(); //szv: was FirstVParameter!
CSLib::Normal(MaxOrder,DerNUV,Standard_Real(1.e-9),U,V,Umin,Umax,Vmin,Vmax,
stat,thenormal,OrderU,OrderV);
if (stat == CSLib_Defined)
{
Normal.SetXYZ(thenormal.XYZ());
DNu = CSLib::DNNormal(1, 0, DerNUV, OrderU, OrderV);
DNv = CSLib::DNNormal(0, 1, DerNUV, OrderU, OrderV);
return Standard_True;
}
return Standard_False;
}
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