## page was renamed from statScreen
## page was renamed from captureScreen.sh
= Overview =
This script takes snapshots of MEDM screens by opening them up in a virtual X display and using a screen capture utility.
It then makes PNG thumbnails and builds a web page of these so that they can be viewed from off site.
A cronjob reruns the image capture and web posting several times per hour.

All of the scripts are living in /cvs/cds/project/statScreen/.

= Taking screen shots in the background =
''statScreen/bin/captureScreen.sh'' takes a screen shot of an X application and saves the image to ''statScreen/images/''.
This script does '''not''' require a physical display. Instead it uses 'Xvfb' (Xwindows Virtual Frame Buffer) to make a
virtual display called :5 (which will cause problems if we ever use 6 monitors on mafalda). MEDM is then told to open its
display on :5. Then the ImageMagik utility 'import' is told to capture the :5 display and save it as a PNG.

For the MEDM screens, there is a wrapper script ''grabMEDMScreens.sh'' which is what the cronjob actually runs.
It takes a list of .adl files as an argument and captures the images of those screens.

The crontab on mafalda is setup to run the file 'statScreen/bin/cronjob.sh' calls ''grabMEDMScreens.sh'' with 
''statScreen/etc/medmScreens.txt''as the argument. 
This job will generate images in ''statScreen/images/''.

'''To change/add MEDM screens to be captured, modify ''statScreen/etc/medmScreens.txt'''''.

Empty lines and lines starting with # are ignored.