---

Common/vtkImplicitFunction.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImplicitFunction.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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.

=========================================================================*/
#ifndef __vtkImplicitFunction_h
#define __vtkImplicitFunction_h

#include "vtkObject.h"

class vtkAbstractTransform;

class VTK_COMMON_EXPORT vtkImplicitFunction : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkImplicitFunction,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  unsigned long GetMTime();


  float FunctionValue(const float x[3]);
  float FunctionValue(float x, float y, float z) {
    float xyz[3] = {x, y, z}; return this->FunctionValue(xyz); };


  void FunctionGradient(const float x[3], float g[3]);
  float *FunctionGradient(const float x[3]) {
    this->FunctionGradient(x,this->ReturnValue);
    return this->ReturnValue; };
  float *FunctionGradient(float x, float y, float z) {
    float xyz[3] = {x, y, z}; return this->FunctionGradient(xyz); };


  virtual void SetTransform(vtkAbstractTransform*);
  vtkGetObjectMacro(Transform,vtkAbstractTransform);


  virtual float EvaluateFunction(float x[3]) = 0;
  float EvaluateFunction(float x, float y, float z) {
    float xyz[3] = {x, y, z}; return this->EvaluateFunction(xyz); };

  virtual void EvaluateGradient(float x[3], float g[3]) = 0;

protected:
  vtkImplicitFunction();
  ~vtkImplicitFunction();

  vtkAbstractTransform *Transform;
  float ReturnValue[3];
private:
  vtkImplicitFunction(const vtkImplicitFunction&);  // Not implemented.
  void operator=(const vtkImplicitFunction&);  // Not implemented.
};

#endif

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