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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkCone.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 "vtkCone.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
vtkCxxRevisionMacro(vtkCone, "$Revision: 1.26 $");
vtkStandardNewMacro(vtkCone);
// Construct cone with angle of 45 degrees.
vtkCone::vtkCone()
{
this->Angle = 45.0;
}
// Evaluate cone equation.
double vtkCone::EvaluateFunction(double x[3])
{
double tanTheta = (double)
tan((double)this->Angle*vtkMath::DegreesToRadians());
return x[1]*x[1] + x[2]*x[2] - x[0]*x[0]*tanTheta*tanTheta;
}
// Evaluate cone normal.
void vtkCone::EvaluateGradient(double x[3], double g[3])
{
double tanTheta = (double)
tan((double)this->Angle*vtkMath::DegreesToRadians());
g[0] = -2.0*x[0]*tanTheta*tanTheta;
g[1] = 2.0*x[1];
g[2] = 2.0*x[2];
}
void vtkCone::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Angle: " << this->Angle << "\n";
}
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