#ifndef YOURPRIMARYGENERATORACTION_HH
#define YOURPRIMARYGENERATORACTION_HH

#include "G4VUserPrimaryGeneratorAction.hh"

class YourDetectorConstruction;
class G4ParticleGun;
class G4Event;

class YourPrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction {

 public:

      YourPrimaryGeneratorAction(YourDetectorConstruction* det);
      ~YourPrimaryGeneratorAction();
   
      // pure virtaul method to implement
      virtual void GeneratePrimaries(G4Event*);
    
      //
      // Additional

      // set default properties of the primary particles
      // type: e-
      // E   : 30 MeV
      // dir : [1,0,0]   | world  o x-pos -----> |  tar(zero)get  |     world |  
      // pos : (x-pos, 0, 0) set by calling UpdatePosition()
      void   SetDefault();  

      // make sure that initial X positon is correct
      void   UpdatePosition();

 private:
    
      YourDetectorConstruction*   fDetector;

      G4ParticleGun*              fGun;
      
};

#endif