Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4MagHelicalStepper.hh,v 2.4 1998/11/13 14:27:10 japost Exp $
+// GEANT4 tag $Name: geant4-00 $
+//                                         Started from G4MagErrorStepper.hh
+//
+// Abstract base class (ie Interface)
+// -------------------
+//    for integrator of particle's equation of motion,
+//    used in tracking in space dependent magnetic field
+// -----------------------------------------------------
+//
+// History:
+// 05.11.98  J.Apostolakis   Creation of new ABC 
+//
+#ifndef G4MagHelicalStepper_hh
+#define G4MagHelicalStepper_hh
+#include "globals.hh"
+#include "G4MagIntegratorStepper.hh"
+#include "G4Mag_EqRhs.hh"
+#include "G4ThreeVector.hh"
+
+class G4MagHelicalStepper : public G4MagIntegratorStepper
+{
+ public:
+
+  G4MagHelicalStepper(G4Mag_EqRhs *EqRhs);
+  ~G4MagHelicalStepper(){} ;
+
+  //   The stepper for the Runge Kutta integration. The stepsize 
+  //     is fixed, equal to h.
+  //     Integrates ODE starting values y[0 to 6 ]
+  //     Outputs yout[] and its estimated error yerr[].
+  
+  void  Stepper(  const G4double y[],
+		  const G4double dydx[],
+		  const G4double h,
+		  G4double yout[],
+		  G4double yerr[]  );
+
+  // performs a 'dump' Step without error calculation.
+  
+  virtual  void  DumbStepper(  const G4double y[],
+			       const G4double dydx[],
+			       const G4double h,
+			       G4double yout[] ) = 0;
+
+  // Estimate maximum distance of curved solution and chord ... 
+  
+  G4double DistChord()   const;
+
+ //  --- Methods used to implement all the derived classes -----
+ protected:
+
+  // a linear Step in regions without magnetic field
+
+  inline void LinearStep( const G4double  yIn[],
+			  const G4double  h,
+			  G4double  yHelix[]);
+  
+  // a first order Step along a helix inside the field
+
+  void AdvanceHelix( const G4double  yIn[],
+		     const G4double  B[],
+		     const G4double  h,
+		     G4double  yHelix[]);
+
+  // evaluate the field at a certain point
+
+  void MagFieldEvaluate( const G4double y[], G4double B[] )   
+    { GetEquationOfMotion()->  GetFieldValue(y, B); }
+
+ private:
+  
+  // Data stored in order to find the chord
+  G4ThreeVector yInitial, yMidPoint, yFinal;
+
+  G4Mag_EqRhs*  fPtrMagEqOfMot;
+};
+
+#include  "G4MagHelicalStepper.icc"
+
+#endif  /* G4MagHelicalStepper_hh */