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92 lines
2.6 KiB
92 lines
2.6 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkParametricRoman.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkParametricRoman.h"
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#include "vtkObjectFactory.h"
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#include "vtkMath.h"
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vtkCxxRevisionMacro(vtkParametricRoman, "$Revision: 1.2 $");
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vtkStandardNewMacro(vtkParametricRoman);
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//----------------------------------------------------------------------------
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vtkParametricRoman::vtkParametricRoman():
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Radius(1)
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{
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this->MinimumU = 0;
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this->MinimumV = 0;
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this->MaximumU = vtkMath::Pi();
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this->MaximumV = vtkMath::Pi();
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this->JoinU = 1;
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this->JoinV = 1;
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this->TwistU = 1;
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this->TwistV = 0;
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this->ClockwiseOrdering = 1;
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this->DerivativesAvailable = 1;
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}
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//----------------------------------------------------------------------------
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vtkParametricRoman::~vtkParametricRoman()
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{
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}
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//----------------------------------------------------------------------------
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void vtkParametricRoman::Evaluate(double uvw[3], double Pt[3], double Duvw[9])
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{
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double u = uvw[0];
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double v = uvw[1];
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double *Du = Duvw;
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double *Dv = Duvw + 3;
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double cu = cos(u);
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double c2u = cos(2.0*u);
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double su = sin(u);
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double s2u = sin(2.0*u);
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double cv = cos(v);
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double cv2 = cv*cv;
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double c2v = cos(2.0*v);
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double s2v = sin(2.0*v);
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double sv = sin(v);
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double a2 = this->Radius*this->Radius;
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// The point
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Pt[0] = a2*cv2*s2u/2.0;
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Pt[1] = a2*su*s2v/2.0;
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Pt[2] = a2*cu*s2v/2.0;
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//The derivatives are:
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Du[0] = a2*cv2*c2u;
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Du[1] = a2*cu*s2v/2.0;
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Du[2] = -a2*su*s2v/2.0;
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Dv[0] = -a2*cv*s2u*sv;
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Dv[1] = a2*su*c2v;
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Dv[2] = a2*cu*c2v;
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}
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//----------------------------------------------------------------------------
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double vtkParametricRoman::EvaluateScalar(double* vtkNotUsed(uv[3]),
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double* vtkNotUsed(Pt[3]),
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double* vtkNotUsed(Duv[9]))
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{
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return 0;
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}
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//----------------------------------------------------------------------------
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void vtkParametricRoman::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "Radius: " << this->Radius << "\n";
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}
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