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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkParametricEllipsoid.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include <cmath>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkParametricEllipsoid);
//------------------------------------------------------------------------------
vtkParametricEllipsoid::vtkParametricEllipsoid()
: XRadius(1)
, YRadius(1)
, ZRadius(1)
{
// Preset triangulation parameters
this->MinimumU = 0;
this->MaximumU = 2.0 * vtkMath::Pi();
this->MinimumV = 0;
this->MaximumV = vtkMath::Pi();
this->JoinU = 1;
this->JoinV = 0;
this->TwistU = 0;
this->TwistV = 0;
this->ClockwiseOrdering = 0;
this->DerivativesAvailable = 1;
}
//------------------------------------------------------------------------------
vtkParametricEllipsoid::~vtkParametricEllipsoid() = default;
//------------------------------------------------------------------------------
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";
}
VTK_ABI_NAMESPACE_END
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