From: schutz <schutz@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Tue, 11 May 2004 12:30:55 +0000 (+0000)
Subject: Added method to calculate absID from position in PHOS local coordinate system
X-Git-Url: http://git.uio.no/git/?p=u%2Fmrichter%2FAliRoot.git;a=commitdiff_plain;h=842988a5e7e081dd14232520f08c54c975210f68

Added method to calculate absID from position in PHOS local coordinate system
---

diff --git a/PHOS/AliPHOSGeometry.cxx b/PHOS/AliPHOSGeometry.cxx
index afb41dcf095..c1bf473819f 100644
--- a/PHOS/AliPHOSGeometry.cxx
+++ b/PHOS/AliPHOSGeometry.cxx
@@ -458,6 +458,19 @@ void AliPHOSGeometry::RelPosInAlice(Int_t id, TVector3 & pos ) const
     pos.Transform(rot) ; // rotate the baby 
 } 
 
+//____________________________________________________________________________
+void AliPHOSGeometry::RelPosToAbsId(const Int_t module, const Double_t x, const Double_t z, Int_t & AbsId) const
+{
+  // converts local PHOS-module (x, z) coordinates to absId 
+  Int_t relid[4] ;
+  relid[0] = module ;
+  relid[1] = 0 ;
+  relid[2] = static_cast<Int_t>(TMath::Ceil( x/ GetCellStep() + GetNPhi() / 2.) );
+  relid[3] = static_cast<Int_t>(TMath::Ceil(-z/ GetCellStep() + GetNZ()   / 2.) ) ;
+  
+  RelToAbsNumbering(relid,AbsId) ;
+}
+
 //____________________________________________________________________________
 void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const 
 {
diff --git a/PHOS/AliPHOSGeometry.h b/PHOS/AliPHOSGeometry.h
index 1582a5ea612..fa6a5ffa164 100644
--- a/PHOS/AliPHOSGeometry.h
+++ b/PHOS/AliPHOSGeometry.h
@@ -77,6 +77,8 @@ public:
                                          // gets the position of element (pad or Xtal) relative to Alice
   Bool_t RelToAbsNumbering(const Int_t * RelId, Int_t & AbsId) const ;         
                                          // converts the absolute PHOS numbering to a relative 
+  void  RelPosToAbsId(const Int_t module, const Double_t x, const Double_t z, Int_t & AbsId) const; 
+                                         // converts local PHOS-module (x, z) coordinates to absId 
 
   Bool_t IsInitialized(void)                  const { return fgInit ; }