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/*=========================================================================
Program: Visualization Toolkit
Module: vtkParametricEnneper.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkParametricEnneper.h"
#include "vtkObjectFactory.h"
#include "vtkMath.h"
vtkStandardNewMacro(vtkParametricEnneper);
//----------------------------------------------------------------------------
vtkParametricEnneper::vtkParametricEnneper()
{
// Preset triangulation parameters
this->MinimumU = -2.0;
this->MinimumV = -2.0;
this->MaximumU = 2.0;
this->MaximumV = 2.0;
this->JoinU = 0;
this->JoinV = 0;
this->TwistU = 0;
this->TwistV = 0;
this->ClockwiseOrdering = 1;
this->DerivativesAvailable = 1;
}
//----------------------------------------------------------------------------
vtkParametricEnneper::~vtkParametricEnneper()
{
}
//----------------------------------------------------------------------------
void vtkParametricEnneper::Evaluate(double uvw[3], double Pt[3], double Duvw[9])
{
double u = uvw[0];
double v = uvw[1];
double *Du = Duvw;
double *Dv = Duvw + 3;
// The point
Pt[0] = u-u*u*u/3+u*v*v;
Pt[1] = v-v*v*v/3+u*u*v;
Pt[2] = u*u-v*v;
//The derivatives are:
Du[0] = 1-u*u+v*v;
Dv[0] = 2*u*v;
Du[1] = 2*u*v;
Dv[1] = 1-v*v+u*u;
Du[2] = 2*u;
Dv[2] = -2*v;
}
//----------------------------------------------------------------------------
double vtkParametricEnneper::EvaluateScalar(double *, double *, double *)
{
return 0;
}
//----------------------------------------------------------------------------
void vtkParametricEnneper::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
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