HMPID/AliHMPIDHelix.cxx

   1 #include "AliHMPIDHelix.h" //class header
   2 #include <TPolyLine3D.h>  //Draw()
   3
   4 ClassImp(AliHMPIDHelix)
   5 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   6 void  AliHMPIDHelix::Print(Option_t *opt) const
   7 {
   8 // Debug printout
   9   Printf("%s helix for Q=%i in B=(0,0,%.2f) tesla",opt,fQ,fBz);
  10   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",
  11                                 fX0.X(),fX0.Y(),fX0.Z(),    fP0.Px(),fP0.Py(),fP0.Pz(), fP0.Mag(),fP0.Theta()*TMath::RadToDeg(),fP0.Phi()*TMath::RadToDeg());
  12 }
  13 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  14 void AliHMPIDHelix::Draw(const Option_t *)
  15 {
  16 // Draw helix by a set of points seperated by 1 cm distance
  17   TVector3 pos,mom;
  18   const Int_t kNpoints=500;
  19   TPolyLine3D *pHelDraw = new TPolyLine3D(kNpoints); pHelDraw->SetLineColor(kGreen);
  20   for(Int_t i=0;i<kNpoints;i++) {
  21     Propagate(i,pos,mom);
  22     pHelDraw->SetPoint(i,pos.X(),pos.Y(),pos.Z());
  23   }
  24   pHelDraw->Draw();
  25 }