1. Andreas Pfeiffer, CERN/IT, andreas.pfeiffer@cern.ch
Space Example
Simplified version of X-ray telescope
needs lots of triggers for few hits (11 hits / 100k ev)
need for quick visualisation of hit positions
Make use of AIDA interfaces
Abstract Interfaces for Data Analysis
Pure Abstract Types
no dependencies on specific analysis tool
Prepare to use G4AnalysisManager
Visitor pattern to do analysis from various places
Step, Start/EndOfRun, Start/EndOfEvent, ...
G4-WS Oct.2000
Andreas Pfeiffer, CERN/IT,

2. Activities during this week
How to integrate the “two worlds”
“global variables vs. OO”
Present status
new class XrayTelHistogram
at construction time:
create Factories using a selected analysis system and
book histograms for analysis using the IHistoFactory
call-back methods for analysis at selected stages of simulation (Step, start/end event/run, ...)
Will later derive from G4AnalysisManager
deals with dynamic loading of components of analysis system
G4-WS Oct.2000
Andreas Pfeiffer, CERN/IT,

3. Andreas Pfeiffer, CERN/IT, andreas.pfeiffer@cern.ch
Some more details
pointer to histoManager is stored in UserSteppingAction at construction time
like the Visitor pattern (to be checked for improvements)
callback from UserSteppingAction::UserSteppingAction to histoManager->analyze(const G4SteppingManager *)
do the analysis in histoManager->analyze
fill histograms
plot position histogram using the visualisation facility from the analysis system directly
G4-WS Oct.2000
Andreas Pfeiffer, CERN/IT,

4. Things to do / whishlist
Lots of possibilities :-) little time :-(
Space example:
store the histogram and visualize it using analysis tool running separately (possibly started by G4AM)
using another analysis system (should be easy as only (AIDA + other) Interfaces are used !)
AIDA
define/agree on Interfaces for the other categories (Ntuple, ...)
more involvement from Geant-4 (> Guy) ????
G4-WS Oct.2000
Andreas Pfeiffer, CERN/IT,