EVE/alice-macros/t0_hits.C

   1 // $Id$
   2 // Main authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007
   3
   4 /**************************************************************************
   5  * Copyright(c) 1998-2008, ALICE Experiment at CERN, all rights reserved. *
   6  * See http://aliceinfo.cern.ch/Offline/AliRoot/License.html for          *
   7  * full copyright notice.                                                 *
   8  **************************************************************************/
   9
  10 TEvePointSet*
  11 t0_hits(const char *varexp    = "T0.fX:T0.fY:T0.fZ",
  12         const char *selection = "")
  13 {
  14   // Extracts  T0 hits.
  15
  16
  17   AliRunLoader* rl =  AliEveEventManager::AssertRunLoader();
  18   rl->LoadHits("T0");
  19
  20   TTree* ht = rl->GetTreeH("T0", false);
  21
  22   Int_t nTracks = ht->GetEntries();
  23   // printf("Found %d tracks. \n",nTracks);
  24   for (Int_t it = 0; it < nTracks; it++) {
  25
  26     TClonesArray *hits = 0;
  27     ht->SetBranchAddress("T0",&hits);
  28
  29     ht->GetEvent(it);
  30     // Int_t nHits = hits->GetEntriesFast();
  31     // printf("Found %d hits in track %d.\n", nHits, it);
  32
  33   }
  34   TEvePointSet* points = new TEvePointSet(Form("T0 Hits '%s'", selection));
  35   points->SetSourceCS(TEvePointSelectorConsumer::kTVT_XYZ);
  36
  37   TEvePointSelector ps(ht, points, varexp, selection);
  38   ps.Select();
  39
  40   points->SetTitle(Form("N=%d", points->Size()));
  41   points->SetMarkerSize(.5);
  42   points->SetMarkerColor(3);
  43
  44   points->SetName(Form("T0 Hits"));
  45   const TString viz_tag("SIM Hits T0");
  46   points->ApplyVizTag(viz_tag, "Hits");
  47
  48   gEve->AddElement(points);
  49   gEve->Redraw3D();
  50
  51   return points;
  52 }