Reports 9.0.2. How to dynamically set graphic/chart width in paper layout?

Hi there,
I have a graphic with vertical bars in paper layout. Its width ranges from quarter of a A4 page width to several ones spanned. I have made the page width large enough but can not control the graphic width dynamically and when too much data must be shown on the X axis the bars get too thick to read.
Is there another way except of?:
- making the graph middle-sized and hoping that the client will not notice the visual glitch when too much or less data is the case;
- using JSP (this is not an option here).
To make the things worse, when the graph is expanded beyond a A4 page width or something its border reflects the change, but its contents is ugly shrunk.
As I browsed this forum, I got convinced that the only way to get the graph under control at some extend is to use JSP web report.
Anyone with experience on this? 10x in advance folks.

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Reports 9.0.2. How to dynamically set graphic/chart width in paper layout?

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