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87 lines
2.6 KiB
C++
87 lines
2.6 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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#define No_Standard_OutOfRange
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#include <gp_Parab2d.hxx>
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#include <gp_Ax2d.hxx>
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#include <gp_Ax22d.hxx>
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#include <gp_Pnt2d.hxx>
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#include <gp_Trsf2d.hxx>
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#include <gp_Vec2d.hxx>
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gp_Parab2d::gp_Parab2d (const gp_Ax2d& theDirectrix,
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const gp_Pnt2d& theFocus,
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const Standard_Boolean theSense)
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{
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const gp_Pnt2d &aDirLoc = theDirectrix.Location();
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const gp_Dir2d &aDirVec = theDirectrix.Direction();
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const gp_Vec2d aFVec(aDirLoc, theFocus);
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const gp_Pnt2d anOrigin(aDirLoc.XY()+aDirVec.XY()*(aFVec.Dot(aDirVec)));
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const gp_Pnt2d anApex(0.5*(anOrigin.XY()+theFocus.XY()));
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focalLength = 0.5*anOrigin.Distance(theFocus);
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gp_Dir2d aXDir = (focalLength > 0.0) ? gp_Dir2d(theFocus.XY()-anOrigin.XY()) :
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theDirectrix.Rotated(aDirLoc,
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theSense ? -M_PI_2 : M_PI_2).Direction();
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pos = gp_Ax22d(anApex, aXDir, aDirVec);
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}
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void gp_Parab2d::Coefficients
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(Standard_Real& A, Standard_Real& B, Standard_Real& C,
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Standard_Real& D, Standard_Real& E, Standard_Real& F) const
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{
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Standard_Real P = 2.0 * focalLength;
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gp_Trsf2d T;
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T.SetTransformation (pos.XAxis());
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Standard_Real T11 = T.Value (1, 1);
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Standard_Real T12 = T.Value (1, 2);
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Standard_Real T13 = T.Value (1, 3);
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Standard_Real T21 = T.Value (2, 1);
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Standard_Real T22 = T.Value (2, 2);
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Standard_Real T23 = T.Value (2, 3);
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A = T21 * T21;
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B = T22 * T22;
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C = T21 * T22;
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D = (T21 * T23) - (P * T11);
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E = (T22 * T23) - (P * T12);
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F = (T23 * T23) - (2.0 * P * T13);
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}
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void gp_Parab2d::Mirror (const gp_Pnt2d& P)
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{ pos.Mirror (P); }
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gp_Parab2d gp_Parab2d::Mirrored (const gp_Pnt2d& P) const
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{
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gp_Parab2d Prb = *this;
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Prb.pos.Mirror (P);
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return Prb;
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}
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void gp_Parab2d::Mirror (const gp_Ax2d& A)
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{ pos.Mirror (A); }
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gp_Parab2d gp_Parab2d::Mirrored (const gp_Ax2d& A) const
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{
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gp_Parab2d Prb = *this;
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Prb.pos.Mirror (A);
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return Prb;
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}
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