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84 lines
2.3 KiB
84 lines
2.3 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkParametricCrossCap.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 "vtkParametricCrossCap.h"
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#include "vtkObjectFactory.h"
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#include "vtkMath.h"
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vtkCxxRevisionMacro(vtkParametricCrossCap, "$Revision: 1.2 $");
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vtkStandardNewMacro(vtkParametricCrossCap);
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//----------------------------------------------------------------------------
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vtkParametricCrossCap::vtkParametricCrossCap()
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{
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// Preset triangulation parameters
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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 = 1;
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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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vtkParametricCrossCap::~vtkParametricCrossCap()
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{
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}
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//----------------------------------------------------------------------------
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void vtkParametricCrossCap::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 su = sin(u);
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double cv = cos(v);
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double c2v = cos(2 * v);
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double sv = sin(v);
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double s2v = sin(2 * v);
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// The point
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Pt[0] = cu * s2v;
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Pt[1] = su * s2v;
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Pt[2] = cv * cv - cu * cu * sv * sv;
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//The derivatives are:
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Du[0] = -Pt[1];
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Du[1] = Pt[0];
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Du[2] = 2 * cu * su * sv * sv;
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Dv[0] = 2 * cu * c2v;
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Dv[1] = 2 * su * c2v;
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Dv[2] = -2 * cv * sv * (1 + cu * cu);
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}
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//----------------------------------------------------------------------------
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double vtkParametricCrossCap::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 vtkParametricCrossCap::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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}
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