---

Common/vtkInitialValueProblemSolver.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkInitialValueProblemSolver.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 __vtkInitialValueProblemSolver_h
#define __vtkInitialValueProblemSolver_h

#include "vtkObject.h"

class vtkFunctionSet;

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


  virtual int ComputeNextStep(float* xprev, float* xnext, float t,
                              float& delT, float maxError, 
                              float& error) 
    {
      float minStep = delT;
      float maxStep = delT;
      float delTActual;
      return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
                                   minStep, maxStep, maxError, error);
    }
  virtual int ComputeNextStep(float* xprev, float* dxprev, float* xnext, 
                              float t, float& delT, float maxError, 
                              float& error)
    {
      float minStep = delT;
      float maxStep = delT;
      float delTActual;
      return this->ComputeNextStep(xprev, dxprev, xnext, t, delT, delTActual,
                                   minStep, maxStep, maxError, error);
    }
  virtual int ComputeNextStep(float* xprev, float* xnext, 
                              float t, float& delT, float& delTActual,
                              float minStep, float maxStep,
                              float maxError, float& error)
    {
      return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
                                   minStep, maxStep, maxError, error);
    }
  virtual int ComputeNextStep(float* xprev, float* dxprev, float* xnext, 
                              float t, float& delT, float& delTActual, 
                              float minStep, float maxStep, 
                              float maxError, float& error) = 0;


  virtual void SetFunctionSet(vtkFunctionSet* functionset);
  vtkGetObjectMacro(FunctionSet,vtkFunctionSet);

  virtual int IsAdaptive() { return this->Adaptive; }
  
//BTX
  enum ErrorCodes
  {
    OUT_OF_DOMAIN = 1,
    NOT_INITIALIZED = 2,
    UNEXPECTED_VALUE = 3
  };
//ETX

protected:
  vtkInitialValueProblemSolver();
  ~vtkInitialValueProblemSolver();

  virtual void Initialize();

  vtkFunctionSet* FunctionSet;

  float* Vals;
  float* Derivs;
  int Initialized;
  int Adaptive;

private:
  vtkInitialValueProblemSolver(const vtkInitialValueProblemSolver&);  // Not implemented.
  void operator=(const vtkInitialValueProblemSolver&);  // Not implemented.
};

#endif

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