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/*=========================================================================
Program: Visualization Toolkit
Module: vtkParametricRoman.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 "vtkParametricRoman.h"
#include "vtkObjectFactory.h"
#include "vtkMath.h"
vtkStandardNewMacro(vtkParametricRoman);
//----------------------------------------------------------------------------
vtkParametricRoman::vtkParametricRoman():
Radius(1)
{
this->MinimumU = 0;
this->MinimumV = 0;
this->MaximumU = vtkMath::Pi();
this->MaximumV = vtkMath::Pi();
this->JoinU = 1;
this->JoinV = 1;
this->TwistU = 1;
this->TwistV = 0;
this->ClockwiseOrdering = 1;
this->DerivativesAvailable = 1;
}
//----------------------------------------------------------------------------
vtkParametricRoman::~vtkParametricRoman()
{
}
//----------------------------------------------------------------------------
void vtkParametricRoman::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;
double cu = cos(u);
double c2u = cos(2.0*u);
double su = sin(u);
double s2u = sin(2.0*u);
double cv = cos(v);
double cv2 = cv*cv;
double c2v = cos(2.0*v);
double s2v = sin(2.0*v);
double sv = sin(v);
double a2 = this->Radius*this->Radius;
// The point
Pt[0] = a2*cv2*s2u/2.0;
Pt[1] = a2*su*s2v/2.0;
Pt[2] = a2*cu*s2v/2.0;
//The derivatives are:
Du[0] = a2*cv2*c2u;
Du[1] = a2*cu*s2v/2.0;
Du[2] = -a2*su*s2v/2.0;
Dv[0] = -a2*cv*s2u*sv;
Dv[1] = a2*su*c2v;
Dv[2] = a2*cu*c2v;
}
//----------------------------------------------------------------------------
double vtkParametricRoman::EvaluateScalar(double* vtkNotUsed(uv[3]),
double* vtkNotUsed(Pt[3]),
double* vtkNotUsed(Duv[9]))
{
return 0;
}
//----------------------------------------------------------------------------
void vtkParametricRoman::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Radius: " << this->Radius << "\n";
}
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