o small correction for calculating the angle from the roc

[u/mrichter/AliRoot.git] / TPC / Base / AliTPCCorrection.cxx

diff --git a/TPC/Base/AliTPCCorrection.cxx b/TPC/Base/AliTPCCorrection.cxx
index 6d65aa7c9bdd7e132f398cde6d88bfa9ad469578..0df4ef1bdd0e89f5725d075268a4a403b29abc91 100644 (file)
--- a/TPC/Base/AliTPCCorrection.cxx
+++ b/TPC/Base/AliTPCCorrection.cxx
@@ -216,7 +216,7 @@ void AliTPCCorrection::DistortPointLocal(Float_t x[], Short_t roc) {
   // roc represents the TPC read out chamber (offline numbering convention)
   //
   Float_t gxyz[3]={0,0,0};
-  Double_t alpha = TMath::Pi()*(roc%18+0.5)/18;
+  Double_t alpha = TMath::TwoPi()*(roc%18+0.5)/18;
   Double_t ca=TMath::Cos(alpha), sa= TMath::Sin(alpha);
   gxyz[0]=  ca*x[0]+sa*x[1];
   gxyz[1]= -sa*x[0]+ca*x[1];
@@ -233,7 +233,7 @@ void AliTPCCorrection::CorrectPointLocal(Float_t x[], Short_t roc) {
   // roc represents the TPC read out chamber (offline numbering convention)
   //
   Float_t gxyz[3]={0,0,0};
-  Double_t alpha = TMath::Pi()*(roc%18+0.5)/18;
+  Double_t alpha = TMath::TwoPi()*(roc%18+0.5)/18;
   Double_t ca=TMath::Cos(alpha), sa= TMath::Sin(alpha);
   gxyz[0]=  ca*x[0]+sa*x[1];
   gxyz[1]= -sa*x[0]+ca*x[1];