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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()
{
}
// ----------------------------------------------------------------------------
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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