JasperReports: Multiline labels on the bar charts

Displaying bar charts in the limited space usually truncates category labels and it makes the chart not readable in some cases:

Not so beautiful, right? So lets fix this problem.

The template format of JasperReports is a bit limited and does not allow to pass some required attributes to jfreechart directly. However for every chart you can specify your own customizer class


<barChart>
<chart hyperlinkType=“None” customizerClass=“org.test.MyCustomizer”>

The main idea of the fix is to allow displaying bar chart labels in two lines. CategoryAxis class from jfreechart is used to render X-axis and its labels. It has method setMaximumCategoryLabelLines which allows to specify how much lines should be used to display labels.

So the full code looks like.

An now our chart looks like:

As you can see the labels in the chart are not truncated no more.