Displaying data trends¶

In order to monitor the progress of experiments, the User interface has the ability to plot the trends (time responses) all sensor values.

Graph - representation of data from single device

Trend - window that contains one or multiple graphs, legend etc.

Global configuration¶

The basic global parameters for configuring data trends can be set through the Settings menu:

Trend buffer size

Defines the maximum duration of a trend that can be stored, in mm:ss (minutes:seconds) format.

Trend sample time

How often should the displayed data be sampled, in seconds. This value is limited from below on 0.5 seconds to avoid unnecessary load on the system. If user is experiencing system stutter, increasing this parameter will lessen memory usage on the long runs.

Creating data trends¶

To start showing some data trends, select the sensor names you are interested in from the Casu data Configuration tab, and bring up the context menu by right-clicking on one of the selected names. This will bring up a context menu with two options:

Plot selected in same trend

Plots data from all selected sources in the same trend.

Plot selected in different trends

Creates a new trend with single graph for each selected source.

Whichever option you choose, additional data can be added to any trend later.

Monitoring and manipulating data trends¶

Once you have created some trends, you can view an manipulate them from the Trend graphs Configuration tab. The following mouse controls are available for manipulating the trend graphs

Click + mouse drag - reposition graph and stop realtime graph adjusting (so you can study an area of interest)
Ctrl + mouse scroll - y-axis zoom
Shift + mouse scroll - x-axis zoom
mouse scroll - x-axis & y-axis zoom
double click - resume realtime graph adjusting

Right-clicking on one of the trends brings up a context menu with the following options:

(Un)Dock from main window - Depending on the current docking state, the trend can either be docked or undocked;
Hide/Show legend - Allows toggling of legend display;
Remove selected graphs - The graph that is selected (by left-click in the current axis) is removed from the axis;
Add graphs (selected in tree) - Data that is currently selected in the Casu data Configuration tab is added to the current axis;
Save to pdf - The current view is saved to a pdf document (a File save dialog is shown which enables the user to choose the filename and location);
Close trend - Closes the trend;