Re: [jCharts-users] Help with charts

[Nathaniel G. A. <nat...@ya...>]

The problem is the Graphics Object in your component is being invalidated because the visible area
of it is changing.  The parent Component is calling repaint() on your component which calls the
paint( Graphics ) method on your component.  You need to render your chart there.

couple options here:
1) if your chart rarely changes, render it to a BufferedImage and simply draw the BufferedImage in
the Components paint( Graphics ) method
2) if you want the chart to scale to fit the component size, then you will have to re-render the
chart in the paint( Graphics ) method.



--- Pablo Velasquez Rivas <pve...@ic...> wrote:
> 
> Hi all !
> 
> Well, I'm newbie using jchart. My problem is that I'm trying to generate 
> a big
> chart in a jpanel, and put it in a jscrollpane. Works fine. But, when I 
> scroll
> up or down the chart, the part of the image that is hidden, do not 
> appear again.
> 
> Could anybody help me ??
> 
> Thanks !
> 
> Pavel
> 
> 
> 
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