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101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkRungeKutta2.h
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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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/**
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* @class vtkRungeKutta2
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* @brief Integrate an initial value problem using 2nd
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* order Runge-Kutta method.
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*
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*
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* This is a concrete sub-class of vtkInitialValueProblemSolver.
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* It uses a 2nd order Runge-Kutta method to obtain the values of
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* a set of functions at the next time step.
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*
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* @sa
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* vtkInitialValueProblemSolver vtkRungeKutta4 vtkRungeKutta45 vtkFunctionSet
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*/
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#ifndef vtkRungeKutta2_h
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#define vtkRungeKutta2_h
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#include "vtkCommonMathModule.h" // For export macro
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#include "vtkInitialValueProblemSolver.h"
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class VTKCOMMONMATH_EXPORT vtkRungeKutta2 : public vtkInitialValueProblemSolver
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{
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public:
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vtkTypeMacro(vtkRungeKutta2, vtkInitialValueProblemSolver);
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/**
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* Construct a vtkRungeKutta2 with no initial FunctionSet.
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*/
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static vtkRungeKutta2* New();
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using Superclass::ComputeNextStep;
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//@{
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/**
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* Given initial values, xprev , initial time, t and a requested time
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* interval, delT calculate values of x at t+delT (xnext).
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* delTActual is always equal to delT.
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* Since this class can not provide an estimate for the error error
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* is set to 0.
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* maxStep, minStep and maxError are unused.
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* This method returns an error code representing the nature of
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* the failure:
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* OutOfDomain = 1,
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* NotInitialized = 2,
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* UnexpectedValue = 3
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*/
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int ComputeNextStep(double* xprev, double* xnext, double t, double& delT, double maxError,
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double& error, void* userData) override
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{
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double minStep = delT;
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double maxStep = delT;
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double delTActual;
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return this->ComputeNextStep(
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xprev, nullptr, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
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}
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int ComputeNextStep(double* xprev, double* dxprev, double* xnext, double t, double& delT,
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double maxError, double& error, void* userData) override
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{
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double minStep = delT;
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double maxStep = delT;
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double delTActual;
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return this->ComputeNextStep(
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xprev, dxprev, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
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}
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int ComputeNextStep(double* xprev, double* xnext, double t, double& delT, double& delTActual,
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double minStep, double maxStep, double maxError, double& error, void* userData) override
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{
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return this->ComputeNextStep(
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xprev, nullptr, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
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}
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int ComputeNextStep(double* xprev, double* dxprev, double* xnext, double t, double& delT,
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double& delTActual, double minStep, double maxStep, double maxError, double& error,
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void* userData) override;
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//@}
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protected:
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vtkRungeKutta2();
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~vtkRungeKutta2() override;
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private:
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vtkRungeKutta2(const vtkRungeKutta2&) = delete;
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void operator=(const vtkRungeKutta2&) = delete;
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};
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#endif
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// VTK-HeaderTest-Exclude: vtkRungeKutta2.h
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