Org.simantics.charts

There are two plug-ins to Simantics charts:

• org.simantics.charts
• org.simantics.trend

org.simantics.charts

Charts is the UI plugin that ties trends to the Simantics Workbench environment. It contributes an editor part, preferences, DnD operations, context menu actions, tool bar buttons, ontology, etc to Simantics Workbench. The main class there is its EditorPart contribution TimeSeriesEditor.

org.simantics.trend

org.simantics.trend is a visualization library that draws items as time-series lines. It supports lines and binary items on the same chart. It is the only current chart implementation. The code in this plugin is environment independent, it can be ran as POJO, EditorPart, ViewPart, or say, Java Applet. The trend visualizations are based on AWT/Swing.

Trend is configured with TrendSpec class. It describes how and with what items the trend is drawn. The info can be changed on the run.

The data source for a trend is a HistoryManager, an interface from org.simantics.history. A trend is configured to visualize items from one history manager. History manager consists of groups and items. There is metadata with each item, such as, id, variableId (the item in datasource), format, deadband, interval, gain, bias, groupId, etc.

Format-field determines the sampling format on the disc. All numeric types are supported: integer, float, double, etc. time and value fields are mandatory. If endTime exists the sample is interpreted as "value band" instead of a single sample. If quality field exists, the trend can have empty regions. min and max fields provide value deviation when the trend is zoomed out.

In typical simantics case, a variable is recorded with different sampling intervals (see TrendSamplingFormats), example: all samples, 100ms, 1s, 10s, 60s. The trend detects all available history items for a recorded variable, and selects the most appropriate file to draw from.