Gabriele Cosmo
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4MagErrorStepper.hh,v 1.4.8.1 1999/12/07 20:48:01 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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// Abstract base class (ie Interface)
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// -------------------
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// for integrator of particle's equation of motion,
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// used in tracking in space dependent magnetic field
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// -----------------------------------------------------
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//
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// History:
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// 09.12.97 W.Wander <wwc@mit.edu> Created G4MagErrorStepper
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// 09.03.98 W.Wander <wwc@mit.edu> Added AdvanceHelix functionality
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// 09.11.98 J.Apostolakis Moved AdvanceHelix to G4MagHelicalStepper
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// $ Id: $
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#ifndef G4MAGERRORSTEPPER_HH
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#define G4MAGERRORSTEPPER_HH
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#include "globals.hh"
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#include "G4MagIntegratorStepper.hh"
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#include "G4Mag_EqRhs.hh"
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#include "G4ThreeVector.hh"
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class G4MagErrorStepper : public G4MagIntegratorStepper
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{
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public:
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G4MagErrorStepper(G4Mag_EqRhs *EqRhs,G4int numberOfVariables);
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~G4MagErrorStepper();
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// The stepper for the Runge Kutta integration. The stepsize
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// is fixed, with the Step size given by h.
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// Integrates ODE starting values y[0 to 6 ]
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// Outputs yout[] and its estimated error yerr[].
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void Stepper( const G4double y[],
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const G4double dydx[],
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const G4double h,
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G4double yout[],
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G4double yerr[] );
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// performs a 'dump' Step without error calculation.
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virtual void DumbStepper( const G4double y[],
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const G4double dydx[],
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const G4double h,
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G4double yout[] ) = 0;
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G4double DistChord() const;
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private:
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// Data stored in order to find the chord
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G4ThreeVector fInitialPoint, fMidPoint, fFinalPoint;
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// G4int theNumberOfVariables ;
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// The following arrays are used only for temporary storage
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// they are allocated at the class level only for efficiency -
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// so that calls to new and delete are not made in Stepper()
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G4double *yInitial, *yMiddle, *dydxMid, *yOneStep;
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};
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#include "G4MagErrorStepper.icc"
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#endif /* G4MAGERRORSTEPPER_HH */
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