/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkCylinder.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkCylinder - implicit function for a cylinder
// .SECTION Description
// vtkCylinder computes the implicit function and function gradient for a
// cylinder. vtkCylinder is a concrete implementation of vtkImplicitFunction.
// Cylinder is centered at Center and axes of rotation is along the
// y-axis. (Use the superclass' vtkImplicitFunction transformation matrix if
// necessary to reposition.)

// .SECTION Caveats
// The cylinder is infinite in extent. To truncate the cylinder use the 
// vtkImplicitBoolean in combination with clipping planes.


#ifndef __vtkCylinder_h
#define __vtkCylinder_h

#include "vtkImplicitFunction.h"

class VTK_EXPORT vtkCylinder : public vtkImplicitFunction
{
public:
  vtkTypeMacro(vtkCylinder,vtkImplicitFunction);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description
  // Construct cylinder radius of 0.5.
  static vtkCylinder *New();

  // Description
  // Evaluate cylinder equation F(x,y,z) = (x-x0)^2 + (z-z0)^2 - R^2.
  float EvaluateFunction(float x[3]);
  float EvaluateFunction(float x, float y, float z)
    {return this->vtkImplicitFunction::EvaluateFunction(x, y, z); } ;

  // Description
  // Evaluate cylinder function gradient.
  void EvaluateGradient(float x[3], float g[3]);

  // Description:
  // Set/Get cylinder radius.
  vtkSetMacro(Radius,float);
  vtkGetMacro(Radius,float);

  // Description:
  // Set/Get cylinder center
  vtkSetVector3Macro(Center,float);
  vtkGetVectorMacro(Center,float,3);
protected:
  vtkCylinder();
  ~vtkCylinder() {};
  vtkCylinder(const vtkCylinder&) {};
  void operator=(const vtkCylinder&) {};

  float Radius;
  float Center[3];

};

#endif


