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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkParametricConicSpiral.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkParametricConicSpiral);
//------------------------------------------------------------------------------
vtkParametricConicSpiral::vtkParametricConicSpiral()
{
// Preset triangulation parameters
this->MinimumU = 0;
this->MaximumU = 2.0 * vtkMath::Pi();
this->MinimumV = 0;
this->MaximumV = 2.0 * vtkMath::Pi();
this->JoinU = 0;
this->JoinV = 0;
this->TwistU = 0;
this->TwistV = 0;
this->ClockwiseOrdering = 0;
this->DerivativesAvailable = 1;
// Conic Spiral
this->A = 0.2;
this->B = 1;
this->C = 0.1;
this->N = 2;
}
//------------------------------------------------------------------------------
vtkParametricConicSpiral::~vtkParametricConicSpiral() = default;
//------------------------------------------------------------------------------
void vtkParametricConicSpiral::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 inv2pi = 1.0 / (2.0 * vtkMath::Pi());
double cnv = cos(this->N * v);
double snv = sin(this->N * v);
double cu = cos(u);
double su = sin(u);
// The point
Pt[0] = this->A * (1 - v * inv2pi) * cnv * (1 + cu) + this->C * cnv;
Pt[1] = this->A * (1 - v * inv2pi) * snv * (1 + cu) + this->C * snv;
Pt[2] = this->B * v * inv2pi + this->A * (1 - v * inv2pi) * su;
// The derivatives are:
Du[0] = -this->A * (1 - v * inv2pi) * cnv * su;
Dv[0] = -this->A * inv2pi * cnv * (1 + cu) -
this->A * (1 - v * inv2pi) * snv * this->N * (1 + cu) - this->C * snv * N;
Du[1] = -this->A * (1 - v * inv2pi) * snv * su;
Dv[1] = -this->A * inv2pi * snv * (1 + cu) +
this->A * (1 - v * inv2pi) * cnv * this->N * (1 + cu) + C * cnv * this->N;
Du[2] = this->A * (1 - v * inv2pi) * cu;
Dv[2] = this->B * inv2pi - this->A * inv2pi * su;
}
//------------------------------------------------------------------------------
double vtkParametricConicSpiral::EvaluateScalar(double*, double*, double*)
{
return 0;
}
//------------------------------------------------------------------------------
void vtkParametricConicSpiral::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "A: " << this->A << "\n";
os << indent << "B: " << this->B << "\n";
os << indent << "C: " << this->C << "\n";
os << indent << "N: " << this->N << "\n";
}
VTK_ABI_NAMESPACE_END
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