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I was able to reproduce your finding by setting autoSort to false in the XYSeries used to construct the renderer. Because your data does not represent a function, you can get a somewhat better result by dividing the set into pieces that are; for example, points 1-4 and points 4-12 are pictured below...

Have you tried setSeriesShapesFilled(false) or setBaseShapesVisible(false)?

I don't see how this can be caused by JFreeChart. Both MemoryUsageDemo (1 Hz) and DTSCTest (10 Hz) update quietly in the background as I type. Can you post an sscce that exhibits the problem you describe?

JUnit is a common dependency; installation is platform dependent. Off-topic, humorous quote from the FAQ : Some developers have argued in favor of putting the tests in a sub-package of the classes under test (e.g. com.xyz.test). The author of this FAQ sees no clear advantage to adopting this approa...

Please consider citing the resources that you found most helpful. This Q&A has some helpful illustrations.

As an alternative, look for setCategoryLabelPositions() in the BarChartDemo1 source.

For thousands of series, consider a JTable with a TableModel that reflects the visibility of each series. The default renderer/editor for a column of type Boolean.class is a JCheckBox . A CellEditorListener could setSeriesVisible() in the editingStopped() implementation. Also look for well-defined s...

I see a similar result with this variation that updates day three of a time series each time a button is pressed. http://i.imgur.com/20Elhl.png import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.util.Random; import javax.swing.AbstractAction; import javax.swing.JButton; impor...

Cross-posted here.

Cross-posted here.

I'm not sure what you mean, but the series names appear in the legend and the tool tip of BarChartDemo1. The source is included in the distribution.

Fails similarly using the RegularTimePeriod s Month and Quarter , but not Year , Week , Day , Hour , Minute or Second . import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.text.SimpleDateFormat; import java.util.Random; import org.jfree.chart.ChartFactory; impor...

Cross-posted here.

You might try hiding the shapes, which are visible by default:

This example adds data to an XYSeries in an XYSeriesCollection each time a button is pressed.