Improved common vertex handling.

[u/mrichter/AliRoot.git] / STEER / AliTrackReference.cxx

diff --git a/STEER/AliTrackReference.cxx b/STEER/AliTrackReference.cxx
index b5179ea64b1640a6b02d1131e5ee2cac6a21142e..7c3fb26a5d643a0f75a297b00438fa3cc1fe3bb6 100644 (file)
--- a/STEER/AliTrackReference.cxx
+++ b/STEER/AliTrackReference.cxx
@@ -15,16 +15,87 @@
 
 
 #include "AliTrackReference.h"
+#include "TVirtualMC.h"
 #include "TParticle.h"
 #include "AliRun.h"
+#include "TLorentzVector.h"
+
+// 
+// Track Reference object is created every time particle is 
+// crossing detector bounds. The object is created by Step Manager
+//
+// The class stores the following informations:
+// track label, 
+// track position: X,Y,X
+// track momentum px, py, pz
+// track length and time of fligth: both in cm
+// status bits from Monte Carlo
+//
+
 
 ClassImp(AliTrackReference)
 
-AliTrackReference::AliTrackReference()
+//_______________________________________________________________________
+ AliTrackReference::AliTrackReference():
+   fTrack(0),
+   fX(0),
+   fY(0),
+   fZ(0),
+   fPx(0),
+   fPy(0),
+   fPz(0),
+   fLength(0)
 {
   //
   // Default constructor
+  // Creates empty object
+
+  for(Int_t i=0; i<16; i++) ResetBit(BIT(i));
+}
+
+//_______________________________________________________________________
+AliTrackReference::AliTrackReference(Int_t label) {
+  //
+  // Create Reference object out of label and
+  // data in TVirtualMC object
+  //
+  // Creates an object and fill all parameters 
+  // from data in VirtualMC
   //
-  fTrack = 0;
-  fX = fY = fZ = fPx = fPy = fPz = fLength = 0.;
+  // Sylwester Radomski, (S.Radomski@gsi.de)
+  // GSI, Jan 31, 2003
+  //
+    
+  TLorentzVector vec;
+  
+  fTrack = label;
+  fLength = gMC->TrackLength();
+  fTime = gMC->TrackTime();
+
+  gMC->TrackPosition(vec);
+
+  fX = vec[0];
+  fY = vec[1];
+  fZ = vec[2];
+  
+  gMC->TrackMomentum(vec);
+  
+  fPx = vec[0];
+  fPy = vec[1];
+  fPz = vec[2];
+
+  // Set Up status code 
+  // Copy Bits from virtual MC
+
+  for(Int_t i=0; i<16; i++) ResetBit(BIT(i));
+
+  SetBit(BIT(0), gMC->IsNewTrack());
+  SetBit(BIT(1), gMC->IsTrackAlive());
+  SetBit(BIT(2), gMC->IsTrackDisappeared());
+  SetBit(BIT(3), gMC->IsTrackEntering());
+  SetBit(BIT(4), gMC->IsTrackExiting());
+  SetBit(BIT(5), gMC->IsTrackInside());
+  SetBit(BIT(6), gMC->IsTrackOut());
+  SetBit(BIT(7), gMC->IsTrackStop()); 
 }
+//_______________________________________________________________________