Data plot

In this window the actual data graphs will be plotted.

This manual refers to LiveGraph version 1.1.X.
While version 2.0.X is similar in general, there are several key improvements.
We are working on the manual for version 2.0.X. and will make it available as soon as possible.

Only the data series selected in the data series settings window will be plotted. The legend will also be displayed in the data series settings window.

An optional data grid will be plotted according to the settings in the graph settings window. The visible area of the data can also be selected in the graph settings window.

The X- and the Y-axes with appropriate unit labels will be displayed along the left and the bottom sides of the plot canvas. The data points will not be labeled in order to keep the plot area tidy even when many data series are displayed. However, as you move the mouse over the plot canvas the data coordinates of the mouse cursor will be displayed at the bottom of the plot window. This makes reading up the coordinates of a data point easy — just place the mouse cursor over the data point.

In order to aid this further, the data points highlighting function will highlight the data points in the vicinity of the mouse cursor and mark the corresponding series in the data series settings window. This feature is not supported when you are using LiveGraph with a Java version prior to version 6 and may cause errors in that case. For further information including how you can turn this feature on and off, see the section on data points highlighting.

If you press the left mouse button while your mouse cursor is inside the plot area a small pop-up message will be displayed listing all data series which contain currently highlighted points. This can be extremely helpful when you are viewing a lot of data series at the same time and you need to determine which graphs belong to which series. Note that feature is only available when point highlighting is enabled. For details, see the corresponding section.

Highlight data points

When you move the mouse over the plot window, LiveGraph paints small circles around the data points in the vicinity of the mouse cursor. This is called data point highlighting. At the same time as points are highlighted in the plot window, the rows corresponding to the data series on which the points are highlighted are also highlighted in the data series settings window. In addition, when you press the left mouse button while the mouse cursor is over the plotter area, a small pop-up window will be displayed with a list of all data series on which points are highlighted at that moment. This feature helps you read the graph when there are many series plotted together.

This feature uses functionality available in Java version 1.6 and later. If you are using Java 1.5 this feature may not be available or it may cause error messages being displayed in the main window.
In addition, this feature is unfortunately relatively computationally expensive. Despite various optimisations employed, locating the points in the vicinity of the mouse cursor is a computationally expensive task. For modern desktop PCs this does not present any real challenge you will hardly notice the calculations. However, if you are using an older computer, the extra load on the processor may be annoying and you might want to switch data points highlighting off.

Because the reasons for turning data point highlighting off are of such permanent nature and do not quickly go, we did not include an option for turning this feature on and off in the user interface (after all, a concise interface is one of LiveGraph's hallmarks). However, you can still change this setting by editing the graph settings file:
First, save your current graph settings using the menu in the main application window. Then, open the .lggs file where you just saved the settings with your favourite text editor. Find the entry with the key "HighlightDataPoints" and change its value from 1 to 0; save the file. Now you can load you LiveGraph graph settings from the modified file and the data point highlighting will be disabled. If you want to switch the feature back on, reverse the procedure.