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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImplicitHalo.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 "vtkImplicitHalo.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include <cassert>
vtkStandardNewMacro(vtkImplicitHalo);
// ----------------------------------------------------------------------------
vtkImplicitHalo::vtkImplicitHalo()
{
this->Center[0] = 0.0;
this->Center[1] = 0.0;
this->Center[2] = 0.0;
this->Radius = 1.0;
this->FadeOut = 0.01;
}
// ----------------------------------------------------------------------------
vtkImplicitHalo::~vtkImplicitHalo() = default;
// ----------------------------------------------------------------------------
double vtkImplicitHalo::EvaluateFunction(double x[3])
{
double result;
double distance = sqrt(vtkMath::Distance2BetweenPoints(this->Center, x));
if (distance > this->Radius)
{
result = 0.0;
}
else
{
double smallRadius = this->Radius * (1.0 - this->FadeOut);
if (distance <= smallRadius)
{
result = 1.0;
}
else
{
// here this->FadeOut and this->Radius cannot be 0.0 as they are handled
// by the cases seen above.
result = (1.0 - distance / this->Radius) / this->FadeOut;
}
}
return result;
}
// ----------------------------------------------------------------------------
void vtkImplicitHalo::EvaluateGradient(double vtkNotUsed(x)[3], double vtkNotUsed(g)[3])
{
assert("check: TODO" && false);
}
// ----------------------------------------------------------------------------
void vtkImplicitHalo::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Center: " << this->Center[0] << "," << this->Center[1] << "," << this->Center[2]
<< endl;
os << indent << "Radius: " << this->Radius << endl;
os << indent << "FadeOut: " << this->FadeOut << endl;
}
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