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56 lines
1.7 KiB
56 lines
1.7 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkCylinder.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkCylinder.h"
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#include "vtkObjectFactory.h"
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vtkCxxRevisionMacro(vtkCylinder, "$Revision: 1.27 $");
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vtkStandardNewMacro(vtkCylinder);
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// Construct cylinder radius of 0.5.
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vtkCylinder::vtkCylinder()
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{
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this->Center[0] = this->Center[1] = this->Center[2] = 0.0;
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this->Radius = 0.5;
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}
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// Evaluate cylinder equation F(x,y,z) = (x-x0)^2 + (z-z0)^2 - R^2.
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double vtkCylinder::EvaluateFunction(double xyz[3])
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{
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double x = xyz[0] - this->Center[0];
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double z = xyz[2] - this->Center[2];
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return ( x * x + z * z - this->Radius*this->Radius );
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}
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// Evaluate cylinder function gradient.
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void vtkCylinder::EvaluateGradient(double xyz[3], double g[3])
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{
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double x = xyz[0] - this->Center[0];
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double z = xyz[2] - this->Center[2];
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g[0] = 2.0 * (x - this->Center[0]);
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g[1] = 0.0;
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g[2] = 2.0 * (z - this->Center[2]);
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}
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void vtkCylinder::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "Center: " << "( " << this->Center[0] << ", " <<
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this->Center[1] << ", " << this->Center[2] << " )";
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os << indent << "Radius: " << this->Radius << "\n";
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}
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