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How can I display a threshold (as an horizontal line) in my chart?
The JViews Charts package provides graphical decorations that you can add to your chart to enhance the presentation.
ilog.views.chart.graphic.IlvDataIndicator class is a predefined decoration that acts as a graphical indicator of a data value or a data range. In order to create a horizontal line for a Cartesian chart, you simply have to create an indicator associated to a specific y-value.
For more information, consult the "Rogue Wave JViews Charts Vxxx > Programmer's documentation > Developing with the JViews Charts SDK" section of the JViews Enterprise documentation.
Take a look at the sample in "Rogue Wave JViews Charts Vxxx > Samples and code examples > JViews Charts samples > Connecting to the data".
There you will find an extensive demonstration of that feature.