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00001 /*=========================================================================
00002 
00003   Program:   Visualization Toolkit
00004   Module:    vtkRungeKutta4.h
00005 
00006   Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
00007   All rights reserved.
00008   See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
00009 
00010      This software is distributed WITHOUT ANY WARRANTY; without even
00011      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00012      PURPOSE.  See the above copyright notice for more information.
00013 
00014 =========================================================================*/
00034 #ifndef vtkRungeKutta4_h
00035 #define vtkRungeKutta4_h
00036 
00037 #include "vtkCommonMathModule.h" // For export macro
00038 #include "vtkInitialValueProblemSolver.h"
00039 
00040 class VTKCOMMONMATH_EXPORT vtkRungeKutta4 : public vtkInitialValueProblemSolver
00041 {
00042 public:
00043   vtkTypeMacro(vtkRungeKutta4,vtkInitialValueProblemSolver);
00044   virtual void PrintSelf(ostream& os, vtkIndent indent);
00045 
00047   static vtkRungeKutta4 *New();
00048 
00049 
00051 
00057   virtual int ComputeNextStep(double* xprev, double* xnext, double t,
00058                               double& delT, double maxError, double& error)
00059     {
00060       double minStep = delT;
00061       double maxStep = delT;
00062       double delTActual;
00063       return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
00064                                    minStep, maxStep, maxError, error);
00065     }
00066   virtual int ComputeNextStep(double* xprev, double* dxprev, double* xnext,
00067                               double t, double& delT,
00068                               double maxError, double& error)
00069     {
00070       double minStep = delT;
00071       double maxStep = delT;
00072       double delTActual;
00073       return this->ComputeNextStep(xprev, dxprev, xnext, t, delT, delTActual,
00074                                    minStep, maxStep, maxError, error);
00075     }
00076   virtual int ComputeNextStep(double* xprev, double* xnext,
00077                               double t, double& delT, double& delTActual,
00078                               double minStep, double maxStep,
00079                               double maxError, double& error)
00080     {
00081       return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
00082                                    minStep, maxStep, maxError, error);
00083     }
00084   virtual int ComputeNextStep(double* xprev, double* dxprev, double* xnext,
00085                               double t, double& delT, double& delTActual,
00086                               double minStep, double maxStep,
00087                               double maxError, double& error);
00089 
00090 protected:
00091   vtkRungeKutta4();
00092   ~vtkRungeKutta4();
00093 
00094   virtual void Initialize();
00095 
00096   double* NextDerivs[3];
00097 private:
00098   vtkRungeKutta4(const vtkRungeKutta4&);  // Not implemented.
00099   void operator=(const vtkRungeKutta4&);  // Not implemented.
00100 };
00101 
00102 #endif
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