Showscan

Sardana provides widgets for plotting scans either online or offline. Currently there are two different widgets for providing these features. These widgets can be used in your GUI or launched from spock.

Showscan online

Showscan online is a simplified Taurus application which provides live scan plots. The number of plots and their configuration depends on the measurement group plotting configuration.

When started it gets populated with empty plots of the active measurement group. As soon as you start scanning the curves and the legend will start to appear. Even if you change the active measurement group or you change the plotting configuration the plots will not get recreated until you start another scan. The purpose of this behavior is to keep the plotted data available for inspection after the scan execution.

../../_images/showscan-online.png

Showscan online plotting two physical counters against the point number and a pseudo counter against the moveable.

Showscan offline

Showscan is basically a simple HDF5 viewer application. It can be launched from Spock using the showscan command. Without arguments, it will show you the result of the last scan in a GUI:

../../_images/spock_snapshot02.png

Scan data viewer in action

showscan scan_number will display data for the given scan number.

Note

The showscan application can only read scans saved in the HDF5 format.

The scan files are saved on the Sardana server machine, however showscan is running on the client one. If it’s not the same machine, you will need to share the scan files between machines, for example with NFS.

Note

If the path to the file on the server is different than on the client, you should use DirectoryMap environment variable to map server paths to client paths.