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/*=========================================================================
Program: Visualization Toolkit
Module: vtkParametricEllipsoid.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 "vtkParametricEllipsoid.h"
#include "vtkObjectFactory.h"
#include "vtkMath.h"
#include <math.h>
vtkStandardNewMacro(vtkParametricEllipsoid);
//----------------------------------------------------------------------------
vtkParametricEllipsoid::vtkParametricEllipsoid() :
XRadius(1)
, YRadius(1)
, ZRadius(1)
{
// Preset triangulation parameters
this->MinimumU = 0;
this->MinimumV = 0;
this->MaximumU = 2.0 * vtkMath::Pi();
this->MaximumV = vtkMath::Pi();
this->JoinU = 1;
this->JoinV = 0;
this->TwistU = 0;
this->TwistV = 0;
this->ClockwiseOrdering = 1;
this->DerivativesAvailable = 1;
}
//----------------------------------------------------------------------------
vtkParametricEllipsoid::~vtkParametricEllipsoid()
{
}
//----------------------------------------------------------------------------
void vtkParametricEllipsoid::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;
for ( int i = 0; i < 3; ++i)
{
Pt[i] = Du[i] = Dv[i] = 0;
}
double cu = cos(u);
double su = sin(u);
double cv = cos(v);
double sv = sin(v);
// The point
Pt[0] = this->XRadius*sv*cu;
Pt[1] = this->YRadius*sv*su;
Pt[2] = this->ZRadius*cv;
//The derivatives are:
Du[0] = -this->XRadius*sv*su;
Du[1] = this->YRadius*sv*cu;
Du[2] = 0;
Dv[0] = this->XRadius*cv*cu;
Dv[1] = this->YRadius*cv*su;
Dv[2] = -this->ZRadius*sv;
}
//----------------------------------------------------------------------------
double vtkParametricEllipsoid::EvaluateScalar(double*, double*, double*)
{
return 0;
}
//----------------------------------------------------------------------------
void vtkParametricEllipsoid::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "X scale factor: " << this->XRadius << "\n";
os << indent << "Y scale factor: " << this->YRadius << "\n";
os << indent << "Z scale factor: " << this->ZRadius << "\n";
}
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