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d5f74e42d6
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 Wrong license statements corrected in several files. Copyright and license statements added in XSD and GLSL files. Copyright year updated in some files. Obsolete documentation files removed from DrawResources.
90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
// Copyright (c) 1995-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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//JCV 16/10/91
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#include <Convert_HyperbolaToBSplineCurve.ixx>
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#include <TColgp_HArray1OfPnt2d.hxx>
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#include <TColStd_HArray1OfReal.hxx>
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#include <TColStd_HArray1OfInteger.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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#include <gp.hxx>
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#include <gp_Ax2d.hxx>
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#include <gp_Dir2d.hxx>
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#include <gp_Trsf2d.hxx>
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static Standard_Integer TheDegree = 2;
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static Standard_Integer MaxNbKnots = 2;
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static Standard_Integer MaxNbPoles = 3;
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//=======================================================================
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//function : Convert_HyperbolaToBSplineCurve
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//purpose :
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//=======================================================================
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Convert_HyperbolaToBSplineCurve::Convert_HyperbolaToBSplineCurve
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(const gp_Hypr2d& H ,
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const Standard_Real U1,
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const Standard_Real U2 )
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: Convert_ConicToBSplineCurve (MaxNbPoles, MaxNbKnots, TheDegree)
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{
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Standard_DomainError_Raise_if( Abs(U2 - U1) < Epsilon(0.),
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"Convert_ParabolaToBSplineCurve");
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Standard_Real UF = Min (U1, U2);
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Standard_Real UL = Max( U1, U2);
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nbPoles = 3;
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nbKnots = 2;
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isperiodic = Standard_False;
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knots->ChangeArray1()(1) = UF; mults->ChangeArray1()(1) = 3;
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knots->ChangeArray1()(2) = UL; mults->ChangeArray1()(2) = 3;
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// construction of hyperbola in the reference xOy.
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Standard_Real R = H.MajorRadius();
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Standard_Real r = H.MinorRadius();
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gp_Dir2d Ox = H.Axis().XDirection();
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gp_Dir2d Oy = H.Axis().YDirection();
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Standard_Real S = ( Ox.X() * Oy.Y() - Ox.Y() * Oy.X() > 0.) ? 1 : -1;
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// poles expressed in the reference mark
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// the 2nd pole is at the intersection of 2 tangents to the curve
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// at points P(UF), P(UL)
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// the weight of this pole is equal to : Cosh((UL-UF)/2)
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weights->ChangeArray1()(1) = 1.;
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weights->ChangeArray1()(2) = Cosh((UL-UF)/2);
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weights->ChangeArray1()(3) = 1.;
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Standard_Real delta = Sinh(UL-UF);
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Standard_Real x = R * ( Sinh(UL) - Sinh(UF)) / delta;
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Standard_Real y = S * r * ( Cosh(UL) - Cosh(UF)) / delta;
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poles->ChangeArray1()(1) = gp_Pnt2d( R * Cosh(UF), S * r * Sinh(UF));
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poles->ChangeArray1()(2) = gp_Pnt2d( x, y);
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poles->ChangeArray1()(3) = gp_Pnt2d( R * Cosh(UL), S * r * Sinh(UL));
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// replace the bspline in the mark of the hyperbola
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gp_Trsf2d Trsf;
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Trsf.SetTransformation( H.Axis().XAxis(), gp::OX2d());
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poles->ChangeArray1()(1).Transform( Trsf);
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poles->ChangeArray1()(2).Transform( Trsf);
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poles->ChangeArray1()(3).Transform( Trsf);
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}
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