[Halld-offline] ROOT TTree Output in SVN

[Paul Mattione]

I just checked in a change to the interface for writing out the TTrees to make it safer when running with multiple plugins.  It's now:

locEventWriterROOTVector[0]->Fill_Trees(locEventLoop, "b1pi_hists");

where the string is the factory tag of the DReaction factory in your plugin.  This way multiple, simultaneously-running plugins won't each save all of the results, which would have caused the trees to have duplicate entries.  

 - Paul

On May 4, 2013, at 1:54 PM, Paul Mattione wrote:

> I've checked the code for the standard ROOT TTree Output into SVN.  Also, the b1pi_hists plugin has been updated to produce the TTree output (and can be used as an example).  Documentation can be found at:
> 
> https://halldweb1.jlab.org/wiki/index.php/Analysis_TTreeFormat
> 
> /******************** BASIC USAGE ********************/
> 
> Basically, to enable TTree output for your DReaction, call (in your DReaction factory init()):
> 
> locReaction->Enable_TTreeOutput("tree_b1pi.root"); //string is output file name
> 
> Then to save the surviving particle combos for your event, call (in your plugin evnt()) (does nothing if no combos found / survived-cuts):
> 
> #include "ANALYSIS/DEventWriterROOT.h"
> vector<const DEventWriterROOT*> locEventWriterROOTVector;
> locEventLoop->Get(locEventWriterROOTVector); //creates the TTrees for all DReactions upon first call
> locEventWriterROOTVector[0]->Fill_Trees(locEventLoop); //saves results (if any) for all output-enabled DReactions in this plugin
> 
> More detailed usage options can be found on the wiki.  
> 
> - Paul
> 
> 
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