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Integrating and Extending BIRT by Iana Chatalbasheva, Tom Bondur, Jason Weathersby

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Chapter 23. Developing a Charting Extension

This chapter discusses the process of adding a new chart type to the BIRT chart engine. BIRT provides a radar chart type with the chart engine as an example of how to build new chart types. This chapter describes how to create this radar chart example.

A radar chart, also known as a spider chart, displays multiple data points proportionately using equidistant radii. This chart type allows the simultaneous comparison of multiple data points in a series. Each data point value determines the magnitude of each radius.

The number of data points in the chart determines the number of radials. The data points can be connected by lines, except for the first and last data points, or all the lines can be connected ...

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