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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCylinder.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 "vtkCylinder.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkCylinder);
// Construct cylinder radius of 0.5.
vtkCylinder::vtkCylinder()
{
this->Center[0] = this->Center[1] = this->Center[2] = 0.0;
this->Radius = 0.5;
}
// Evaluate cylinder equation F(x,y,z) = (x-x0)^2 + (z-z0)^2 - R^2.
double vtkCylinder::EvaluateFunction(double xyz[3])
{
double x = xyz[0] - this->Center[0];
double z = xyz[2] - this->Center[2];
return ( x * x + z * z - this->Radius*this->Radius );
}
// Evaluate cylinder function gradient.
void vtkCylinder::EvaluateGradient(double xyz[3], double g[3])
{
double x = xyz[0] - this->Center[0];
double z = xyz[2] - this->Center[2];
g[0] = 2.0 * (x - this->Center[0]);
g[1] = 0.0;
g[2] = 2.0 * (z - this->Center[2]);
}
void vtkCylinder::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Center: " << "( " << this->Center[0] << ", " <<
this->Center[1] << ", " << this->Center[2] << " )";
os << indent << "Radius: " << this->Radius << "\n";
}