Recently we published a tutorial requested by many of the JIRA PDF View Plugin users. We are happy to see that a significant part of the user community goes beyong exporting textual PDF reports, as graphical visualization really makes JIRA data and trends easier to understand.
The tutorial explains rendering charts in PDF exports in general, collecting source data and customizing the appearance of the final chart. It also shows working examples for line-, pie- and barcharts, implementing typical data visualization problems.
Please read the article here: http://midori.hu/products/jira-pdf-view-plugin/documentation/charts