Running the Interactive COBRA Demo

Requirements

python2.2
CMS environment: if not please:
setenv PATH /afs/cern.ch/cms/utils/:${PATH}
or
export PATH=/afs/cern.ch/cms/utils/:${PATH}
the latest greatest COBRA version (7_5_0)

If you have access to cern afs this is granted to be true

Startup

Just excecute

wget http://cobra.web.cern.ch/cobra/testdata/go
chmod 755 go
./go

it will run a python script that creates a local COBRA area, bootstrap it, copy a bunch of files locally, opens emacs with a python script and finally starts icobra

Playing

Disclaimer

This is just a prototype, it is unstable and not robust enough to support end-users.
In using it please be very patient, particularly if you are on a slow and overloaded system and network (lxplus for instance). Take into account that it segfaulted on me few times on lxplus before running properly.

In a close future it will be ported to Iguana that is able to handle Qt events much better.

Escape Lane

if you are lost just control-z, and killall -9 icobra
(You may need to kill few more python and icobra processes by hand)

Enjoying

go forward and backward in the event collection using next event and previous event. If you pass first or last event just Rewind
wait a message of the type tellHim... before clicking further
click event dump and wait that the Qt canvas with the event structure appears.
Green exagons represent Runs, Magenta exagons represent Digi events, Big Red exagons represent Reco events, Small Red exagons represent RecObj collections
Use left button and mouse to move the objects around; click on the right mouse to inspect them (dump on cout at the moment). RecObj (small exagon) do not respond yet to inspection.
to exit click the big Quit button. any other procedure requires usage of the Escape way

Runnig scripts

copy the script opened in emacs in the paste buffer
click on the edit script button
your preferred editor will start up
paste the script in the editor buffer
if emacs close it with control-x # (or save and close)
else: typically save and exit

Python scripts write in the first pad below the buttons.
Clicking on event dump you should notice that the Transient event has changed...

Understanding what happened

the go script

Inspecting the go you will notice that it is a sort of prototype of a python-binding to scram.

the Qt windows

just copy paste form qt example. It contains still the original demo fuctionalities...

the python script

Python version of the well known COBRA Observers, RecCollections and so on, built using boost-python and pyste.

Code source

Code for the Demo is under COBRA/Visualisation/EventReaderTest

Vincenzo Innocente

Most recently modified on Mon Dec 15 13:51:26 CET 2003 by Vincenzo Innocente