RICH/AliRICHHelix.cxx

   1 #include "AliRICHHelix.h" //class header
   2 #include <TPolyLine3D.h>  //Draw()
   3
   4 ClassImp(AliRICHHelix)
   5 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   6 AliRICHHelix::AliRICHHelix(Double_t p,Double_t theta,Double_t phi,Double_t bz):TObject()
   7 {
   8   fX0.SetXYZ(0,0,0);                                                       fX=fX0;
   9   fP0.SetMagThetaPhi(p,theta*TMath::DegToRad(),phi*TMath::DegToRad());     fP=fP0;
  10   fLen=0; fQ=1;fBz=bz;
  11 }
  12 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  13 void  AliRICHHelix::Print(Option_t *opt) const
  14 {
  15 // Debug printout
  16   Printf("%s helix for Q=%i in B=(0,0,%.2f) tesla",opt,fQ,fBz);
  17   Printf("Helix parametrised  @ x0=(%6.2f,%6.2f,%6.2f) cm p0=(%6.2f,%6.2f,%6.2f) GeV  P=%.2f GeV Theta=%.2f Phi=%.2f degrees",
  18                                 fX0.X(),fX0.Y(),fX0.Z(),    fP0.Px(),fP0.Py(),fP0.Pz(), fP0.Mag(),fP0.Theta()*TMath::RadToDeg(),fP0.Phi()*TMath::RadToDeg());
  19   Printf("@ %7.2f cm           x=(%6.2f,%6.2f,%6.2f) cm  p=(%6.2f,%6.2f,%6.2f) GeV  P=%.2f GeV Theta=%.2f Phi=%.2f degrees",
  20            fLen,              fX.X(), fX.Y(), fX.Z(),       fP.Px(),fP.Py(),fP.Pz(), fP.Mag(), fP.Theta()*TMath::RadToDeg(),fP.Phi()*TMath::RadToDeg());
  21   Printf("             in LORS   rad=(%5.2f,%5.2f)  pc=(%5.2f,%5.2f)",fPosRad.X(), fPosRad.Y(),fPosPc.X(),fPosPc.Y());
  22 }
  23 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  24 void AliRICHHelix::Draw(const Option_t *)
  25 {
  26 // Draw helix by a set of points seperated by 1 cm distance
  27
  28   const Int_t kNpoints=500;
  29   TPolyLine3D *pHelDraw = new TPolyLine3D(kNpoints); pHelDraw->SetLineColor(kGreen);
  30   for(Int_t i=0;i<kNpoints;i++) {
  31     Propagate(i);
  32     pHelDraw->SetPoint(i,fX.X(),fX.Y(),fX.Z());
  33   }
  34   pHelDraw->Draw();
  35 }