JBLHelix.h

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#ifndef __JBLHELIX_H
#define __JBLHELIX_H


class ThreeVector;
class TwoVector;

// Class JBLHelix

class JBLHelix {
  public:
    JBLHelix (double kappa,    
              double phi0,     
              double theta,    
              double dca,      
              double z0        
              );
    JBLHelix (double par_[]    
             );
    ~JBLHelix();
    
    double getPar (int i        
                  );
    JBLHelix& setPar (int i,       
                      double par_  
                     );
    

    int getClosestApproach (const JBLHelix& h1,   
                            double& s0,           
                            double& s1,           
                            double& s02nd,        
                            double& s12nd         
                           ) const;
     double getClosestS (const TwoVector& p            
                        ) const;
     double getClosestS (const ThreeVector& p          
                        ) const;
    void getTrajectoryPointEx (double s,   
                               ThreeVector& p  
                              ) const; 
    ThreeVector getTrajectoryPoint (double s  
                                   ) const; 
    double getTrajectoryZ (double s  
                          ) const; 
                 
    void getCenterPointEx (TwoVector& p  
                          ) const; 
    TwoVector getCenterPoint () const; 
    
    double getNormalS (double s) const;
    
  private:
    enum {NPAR = 5};
    double par[NPAR];  
};

#endif // __JBLHELIX_H

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