00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id: G4MagErrorStepper.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4MagErrorStepper 00031 // 00032 // Class description: 00033 // 00034 // Abstract base class for integrator of particle's equation of motion, 00035 // used in tracking in space dependent magnetic field. 00036 00037 // History: 00038 // 09.12.97 W.Wander <wwc@mit.edu> Created G4MagErrorStepper 00039 // -------------------------------------------------------------------- 00040 00041 #ifndef G4MAGERRORSTEPPER_HH 00042 #define G4MAGERRORSTEPPER_HH 00043 00044 #include "G4Types.hh" 00045 #include "G4MagIntegratorStepper.hh" 00046 #include "G4Mag_EqRhs.hh" 00047 #include "G4ThreeVector.hh" 00048 00049 class G4MagErrorStepper : public G4MagIntegratorStepper 00050 { 00051 public: // with description 00052 00053 G4MagErrorStepper(G4EquationOfMotion *EqRhs, G4int numberOfVariables, G4int numStateVariables=12); 00054 virtual ~G4MagErrorStepper(); 00055 00056 void Stepper( const G4double y[], 00057 const G4double dydx[], 00058 G4double h, 00059 G4double yout[], 00060 G4double yerr[] ); 00061 // The stepper for the Runge Kutta integration. The stepsize 00062 // is fixed, with the Step size given by h. 00063 // Integrates ODE starting values y[0 to 6]. 00064 // Outputs yout[] and its estimated error yerr[]. 00065 00066 virtual void DumbStepper( const G4double y[], 00067 const G4double dydx[], 00068 G4double h, 00069 G4double yout[] ) = 0; 00070 // Performs a 'dump' Step without error calculation. 00071 00072 G4double DistChord() const; 00073 00074 private: 00075 00076 G4MagErrorStepper(const G4MagErrorStepper&); 00077 G4MagErrorStepper& operator=(const G4MagErrorStepper&); 00078 // Private copy constructor and assignment operator. 00079 00080 private: 00081 00082 // STATE 00083 G4ThreeVector fInitialPoint, fMidPoint, fFinalPoint; 00084 // Data stored in order to find the chord 00085 00086 // Dependent Objects, owned --- part of the STATE 00087 G4double *yInitial, *yMiddle, *dydxMid, *yOneStep; 00088 // The following arrays are used only for temporary storage 00089 // they are allocated at the class level only for efficiency - 00090 // so that calls to new and delete are not made in Stepper(). 00091 }; 00092 00093 #include "G4MagErrorStepper.icc" 00094 00095 #endif /* G4MAGERRORSTEPPER_HH */