Extra, extra, read all about it "Charting FAQ Found"
By Tim Dexter-Oracle on Feb 20, 2012
I was digging back through some previous chart entries looking for something for a customer. One of the holy grails was the Oracle Reports Charting FAQ page that I have linked to (BIP 10g shares the same engine) ... the page is missing :0(
Enter the Wayback Machine and a bit of digging and I found a copy :0) I have saved it locally for all to share, some images are missing but the code for the chart features you want are there. Get it here or you can jump over to the time machine page here.
Enjoy time traveling!