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42cf5bc1ca
Automatic upgrade of OCCT code by command "occt_upgrade . -nocdl": - WOK-generated header files from inc and sources from drv are moved to src - CDL files removed - All packages are converted to nocdlpack
89 lines
3.1 KiB
C++
89 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.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_Hypr2d.hxx>
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#include <gp_Trsf2d.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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#include <TColgp_HArray1OfPnt2d.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColStd_HArray1OfInteger.hxx>
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#include <TColStd_HArray1OfReal.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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