This file is http://www.lal.in2p3.fr/BaBar/GraphicsTutorial/gratut_annecy.html.

A full Graphics Tutorial can be found at
http://www.lal.in2p3.fr/BaBar/GraphicsTutorial/ (European version)
[or
http://prancer.physics.louisville.edu/GraTutorial/ (US)]

The following instructions are valid for release 6.5.2, and allow to run the multipurpose GraDisplayApp interactive program on xdr files.

You may also choose to run specific display programs, as TrkGraApp or DrcGraApp. For fun, the latter is proposed in two flavours: running on data stored on xdr or on EventStore database.

You may also have a look at the program structure and play with the customizations.

All these applications will run first the reconstruction of the events

Preliminaries: setting up

1. logon to a terminal under ecolenn where nn runs from 01 to 20 (ask me for the password)

2. source $GROUP_DIR/gra_tut/gratut_cshrc
   This will setup some useful aliases and make OO_FD_BOOT point to a valid database.

3. setenv DISPLAY xx.yy.zz:0.0

Running pre-built applications

This part of the tutorial is meant to practice the BaBar event display windows and panels. To save time, a release directory has been created under all ecolenn logons, with binaries pointing to pre-built applications:

cd public/gratut/Rel6.5.2/workdir

Then make your choice:

• GraDisplayApp : with the options set at building time (the default options), this application allows you to display Svt, Dch, Trk, Emc data and detectors. To run it, just type

  disprun

• TrkGraApp : tracking specific display, with refit capability. Type:

  disprun -exe TrkGraApp ../TrkGra/trkgra.tcl

• DrcGraApp_Xdr : DIRC specific display, running on xdr files. Type:

  @DrcGra_Xdr aliased to disprun -exe DrcGraApp_Xdr ../DrcGra/drcgraXdr.tcl

• DrcGraApp_Bdb : DIRC specific display, running on Bdb (xdr translated EventStore)

  @DrcGra_Bdb aliased to disprun -exe DrcGraApp_Bdb ../DrcGra/drcgraBdb.tcl

Follow the Working with Graphics Applications. part of the full Graphics Tutorial to play with the panels and windows.

If you chose the DrcGraApp applications, the example Walkthrough may be a good start.

You will tailor your display windows as you wish and, eventually save them to a Postscript or Gif file.
The configuration you design is saved when moving through events. It is not saved however when leaving the application. It can be partly recovered by editing the .tcl file and setting the toggles appropriately.

Customizing applications

Beyond the customization you do at running time, either from GUI or from tcl, you may also customize the application itself.

This part of the tutorial is meant to perform some of these customizations, which are foreseen at two levels:

• at gmake time
• at the event loop level (in XxxGraAppLoop.cc)