TrkFitFun.h

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#ifndef TRKFITFUN_H
#define TRKFITFUN_H
 
#include <string>
#include <vector>
 
namespace TrkFitFun
{
    /* exterior product */
    void expd(double veca[3], double vecb[3], double val[3]);
 
    /* distance of two lines */
    int dist2Line(double sta[3], double stb[3], double veca[3], double vecb[3],double &d, double xyz_a[3], double xyz_b[3], int fgZcal = 1);
 
    /* doca of helix track and wire(line) */
    double docaHelixWire(double trkpar[], double wirest[], double wirev[], double &zwire, double zini);
    bool   getDoca(double trkpar[], double wpos[], double &doca,double whitPos[], double zini);
    double getPhiIni(double trkpar[], double rLayer, double pos[]);
 
    /* derivative of doca to track paramters */
    bool getDeriLoc(int ipar, double helix[], double &deri, double wpos[], double zini);
    
    /* number of iteration in doca calculation */
    extern int gNiter;
    
    const double CC   = 2.99792458E10;       // cm/sec, light velocity
    const double PI   = 3.141592653;
    const double PI2  = 6.283185307;
    const double HFPI = 1.570796327;
    const double BFIELD = 1.0;  /* Tesla */
    
    const int NTRKPAR = 5;  /* number of track parameters */
    
    const int gNsamLC = 5;
                               // dr,   phi0,  kappa,   dz,     tanL
    const double gStepLC[5] = {0.0001, 0.0001, 0.00001, 0.0001, 0.0001};    /* units of dr&dz are cm */
}
 
#endif