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85 lines
2.3 KiB
85 lines
2.3 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkParametricMobius.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 "vtkParametricMobius.h"
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#include "vtkObjectFactory.h"
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#include "vtkMath.h"
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vtkCxxRevisionMacro(vtkParametricMobius, "$Revision: 1.3 $");
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vtkStandardNewMacro(vtkParametricMobius);
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//----------------------------------------------------------------------------
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vtkParametricMobius::vtkParametricMobius()
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{
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this->MinimumU = 0;
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this->MinimumV = -1;
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this->MaximumU = 2 * vtkMath::Pi();
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this->MaximumV = 1;
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this->JoinU = 1;
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this->JoinV = 0;
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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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this->Radius = 1;
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}
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//----------------------------------------------------------------------------
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vtkParametricMobius::~vtkParametricMobius()
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{
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}
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//----------------------------------------------------------------------------
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void vtkParametricMobius::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 cu2 = cos( u / 2 );
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double su = sin(u);
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double su2 = sin( u / 2 );
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double t = this->Radius - v * su2;
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// The point
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Pt[0] = t * su;
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Pt[1] = t * cu;
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Pt[2] = v * cu2;
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//The derivatives are:
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Du[0] = -v*cu2*su/2+Pt[1];
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Du[1] = -v*cu2*cu/2-Pt[0];
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Du[2] = -v*su2/2;
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Dv[0] = -su2*su;
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Dv[1] = -su2*cu;
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Dv[2] = cu2;
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}
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//----------------------------------------------------------------------------
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double vtkParametricMobius::EvaluateScalar(double *, double*, double *)
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{
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return 0;
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}
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//----------------------------------------------------------------------------
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void vtkParametricMobius::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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