Don't know about FusionCharts, but this is not possible with a FileMaker Chart Object.
I have seen a demo where Java script in a web viewer made this happen but do not know the specifics that the demonstrator used.
Can you please share the file on this "I have seen a demo where Java script in a web viewer made this happen"?
I want to see/check the file to know more about this.
I don't have a copy. I was attending a DigFM meeting in Santa Clara when a presenter demonstrated it.