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/*=========================================================================
Program: Visualization Toolkit
Module: vtkParametricTorus.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 "vtkParametricTorus.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkParametricTorus);
//------------------------------------------------------------------------------
vtkParametricTorus::vtkParametricTorus()
: RingRadius(1.0)
, CrossSectionRadius(0.5)
{
this->MinimumU = 0;
this->MaximumU = 2 * vtkMath::Pi();
this->MinimumV = 0;
this->MaximumV = 2 * vtkMath::Pi();
this->JoinU = 1;
this->JoinV = 1;
this->TwistU = 0;
this->TwistV = 0;
this->ClockwiseOrdering = 0;
this->DerivativesAvailable = 1;
}
//------------------------------------------------------------------------------
vtkParametricTorus::~vtkParametricTorus() = default;
//------------------------------------------------------------------------------
void vtkParametricTorus::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 su = sin(u);
double cv = cos(v);
double sv = sin(v);
double t = this->RingRadius + this->CrossSectionRadius * cv;
// The point
// Pt[0] = t * cu;
// Pt[1] = t * su;
Pt[0] = t * su;
Pt[1] = t * cu;
Pt[2] = this->CrossSectionRadius * sv;
// The derivatives are:
Du[0] = t * cu;
Du[1] = -t * su;
Du[2] = 0;
Dv[0] = -this->CrossSectionRadius * sv * su;
Dv[1] = -this->CrossSectionRadius * sv * cu;
Dv[2] = this->CrossSectionRadius * cv;
}
//------------------------------------------------------------------------------
double vtkParametricTorus::EvaluateScalar(
double* vtkNotUsed(uv[3]), double* vtkNotUsed(Pt[3]), double* vtkNotUsed(Duv[9]))
{
return 0;
}
//------------------------------------------------------------------------------
void vtkParametricTorus::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Ring Radius: " << this->RingRadius << "\n";
os << indent << "Cross-Sectional Radius: " << this->CrossSectionRadius << "\n";
}
VTK_ABI_NAMESPACE_END
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