11. The chart example explained

The reportChart.xre entry in the database contains an example that shows how to use J4L RChart within the designer. The usage of RChart involves 2 steps:

1. First you have to design the chart independently of the FO Designer. The documentation for RChart is here
   
   http://www.java4less.com/charts/userguide/tutorialcontents.hml
   
   Optionally you can use the Visual Builder to design you chart.
   
   In any case the output of the chart designer process is a parameters file (see example\chart\stackedBar.txt) which contains the chart and some test data you have used during the development.
   
   We do not recommend to develop a new chart from scratch but take one of the existing example and modify it according to your needs. You can download the Rchart evaluation package and you will find many examples in the data\examples directory.
   
2. in the second step you create your report, add a chart object and specify the following properties (see screenshot below):
• the "Data File" field must point to the chart's parameter file
• the parameters of the data file whose values must be overwritten by the values from the XML file. You can enter up to 9 of these parameters.
  
  In the example the values for the parameters SERIE_DATA_1, SERIE_DATA_2 and XAXIS_LABELS will be read from the XML elements defined in the "XPath" fields (thus the test values for these parameters in the stackedBar.txt file, will be overridden).