From: alla <alla@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Fri, 24 Mar 2000 17:46:58 +0000 (+0000)
Subject: Vertex reconstruction
X-Git-Url: http://git.uio.no/git/?p=u%2Fmrichter%2FAliRoot.git;a=commitdiff_plain;h=6740ab97f2de8459ff856e20c68590ce2d6e871f

Vertex reconstruction
---

diff --git a/START/AliSTARTvertex.cxx b/START/AliSTARTvertex.cxx
new file mode 100644
index 00000000000..ff87eafae17
--- /dev/null
+++ b/START/AliSTARTvertex.cxx
@@ -0,0 +1,99 @@
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ *                                                                        *
+ * Author: The ALICE Off-line Project.                                    *
+ * Contributors are mentioned in the code where appropriate.              *
+ *                                                                        *
+ * Permission to use, copy, modify and distribute this software and its   *
+ * documentation strictly for non-commercial purposes is hereby granted   *
+ * without fee, provided that the above copyright notice appears in all   *
+ * copies and that both the copyright notice and this permission notice   *
+ * appear in the supporting documentation. The authors make no claims     *
+ * about the suitability of this software for any purpose. It is          *
+ * provided "as is" without express or implied warranty.                  *
+ **************************************************************************/
+/*
+$Log$
+*/ 
+#include <TObject.h>
+#include "AliSTARTvertex.h"
+#include "AliSTARTdigit.h"
+#include "AliSTARThit.h"
+#include "AliSTART.h"
+#include "AliRun.h"
+#include "AliMC.h"
+
+ClassImp(AliSTARTvertex)
+
+AliSTARTvertex::AliSTARTvertex( Int_t * Zposit)
+{
+  //
+  // Create START digit
+  //     The creator for the AliSTARTvertex class. This routine fills the
+  // AliSTARTvertex data members from the array vertex.
+  // The order of the elements in the vertex array are
+  // fEvent = digits[0], fZposition = vertex[1],
+  // fTime_diff = Vertex[2]
+  // Therefore the array digits is expected to be at least 3 elements long.
+  //
+
+  Zposit = &fZposition ;
+}
+
+void AliSTARTvertex::Reconstruct(Int_t evNumber=1) 
+{
+ 
+  Int_t timediff;
+  Float_t timePs;
+  char nameTD[8],nameTR[8];
+
+  TBranch *bRec=0;
+  TBranch *bd;
+  AliSTARTdigit *digits;
+  AliSTARTvertex *vertex;
+ 
+  Int_t buffersize=256;
+  Int_t split=1;
+ 
+  // TParticle *particle;
+  digits = new AliSTARTdigit();
+  vertex = new AliSTARTvertex();
+  // AliSTART *START  = (AliSTART*) gAlice->GetDetector("START");
+
+ // Event ------------------------- LOOP  
+   
+    sprintf(nameTD,"TreeD%d",evNumber);
+    printf("%s\n",nameTD);
+    TTree *TD = (TTree*)gDirectory->Get(nameTD);
+    bd = TD->GetBranch("START");
+    bd->SetAddress(&digits);
+    bd->GetEvent(0);
+    printf(" Digits: "); digits->MyDump();
+    
+    sprintf(nameTR,"TreeR%d",evNumber);
+    TTree *TR = new TTree(nameTR,"START");
+    bRec = TR->Branch("START","AliSTARTvertex",&vertex,buffersize,split);
+
+    //  TD->Print(); TD->Show(0); TD->GetBranch("START")->Dump();
+  
+    if(digits->fTime_average!=0)
+      {
+      timediff=digits->fTime_diff;     //time in number of channels
+      timePs=(timediff-128)*10.;       // time in Ps
+      printf(" timediff %d in PS %f\n",timediff,timePs);
+      Float_t c = 299792458/1.e9;  //speed of light cm/ps
+      Float_t Zposit=timePs*c;
+      printf(" Z position %f\n",Zposit);
+      //      vertex->GetVertex();
+      vertex->Set(Zposit);
+      TR->Fill();
+      TR->Write();
+      //hTimediff->Fill(timePs);
+      //hVertex->Fill(Zposit);
+      }
+
+}
+
+
+
+
diff --git a/START/AliSTARTvertex.h b/START/AliSTARTvertex.h
new file mode 100644
index 00000000000..6aa0dc70d0e
--- /dev/null
+++ b/START/AliSTARTvertex.h
@@ -0,0 +1,30 @@
+#ifndef STARTVERTEX_H
+#define STARTVERTEX_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice                               */
+
+/* $Id$ */
+#include "AliSTART.h"
+
+//___________________________________________
+class AliSTARTvertex   : public TObject {
+
+
+////////////////////////////////////////////////////////////////////////
+ public:
+  Int_t fZposition;        // Z position of vertex
+
+ public:
+    AliSTARTvertex() {}
+    AliSTARTvertex(Int_t *);
+    void Reconstruct(Int_t);
+    Int_t GetVertex();
+    virtual ~AliSTARTvertex() {}
+    void Set(Int_t);
+
+    ClassDef(AliSTARTvertex,1)  //Reconstructive vertex (Header) object 
+};
+inline Int_t AliSTARTvertex::GetVertex(){return fZposition;}
+inline void AliSTARTvertex::Set(Int_t Z_position)
+  {fZposition=Z_position;}
+#endif