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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkSphere.cxx,v $
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 "vtkSphere.h"
#include "vtkObjectFactory.h"
vtkCxxRevisionMacro(vtkSphere, "$Revision: 1.26 $");
vtkStandardNewMacro(vtkSphere);
// Construct sphere with center at (0,0,0) and radius=0.5.
vtkSphere::vtkSphere()
{
this->Radius = 0.5;
this->Center[0] = 0.0;
this->Center[1] = 0.0;
this->Center[2] = 0.0;
}
// Evaluate sphere equation ((x-x0)^2 + (y-y0)^2 + (z-z0)^2) - R^2.
double vtkSphere::EvaluateFunction(double x[3])
{
return ( ((x[0] - this->Center[0]) * (x[0] - this->Center[0]) +
(x[1] - this->Center[1]) * (x[1] - this->Center[1]) +
(x[2] - this->Center[2]) * (x[2] - this->Center[2])) -
this->Radius*this->Radius );
}
// Evaluate sphere gradient.
void vtkSphere::EvaluateGradient(double x[3], double n[3])
{
n[0] = 2.0 * (x[0] - this->Center[0]);
n[1] = 2.0 * (x[1] - this->Center[1]);
n[2] = 2.0 * (x[2] - this->Center[2]);
}
void vtkSphere::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Radius: " << this->Radius << "\n";
os << indent << "Center: (" << this->Center[0] << ", "
<< this->Center[1] << ", " << this->Center[2] << ")\n";
}
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