ming rocks.
ming creates swf files on the fly, which can be made interactive.

I haven't used the ruby binding, but I have used the PHP binding.
It appears to be an abandoned project, but the ming code is still
highly functional.

http://madscientist.jp/~ikegami/ruby/ming/
http://www16.brinkster.com/gazb/ming/index.html
http://ming.sourceforge.net/
http://www.onlamp.com/pub/a/php/2001/06/28/flash.html?page=2
http://www.productbeta.com/tutorials/show.php?goomba=3&
http://www.thatmingthing.com/ming_.php
http://namazu.org/~satoru/mingplot/
http://www.video-animation.com/mx2k_01.shtml


Sung Soo Kim wrote:

> I need to draw a simple graphs to post my biological data on web.
> And I also want to add some interactivity into the graph (using like a simiple
> imagemap).
> To do this, I need to know the position of squares or circles on the graph.
> So, instead of using statistical toolbox to draw the graph and find where
> square and circles are in the graph (which can be scary job), I want to draw
> the graph by myself and make an imagemap based on my drawing.
> 
> --> The conclusion is that I need a really simple drawing tool that makes it
> possible to draw lines, squares, circles, and some characters, and to save the
> result file in GIF format or JPG format.
> 
> Is there any simple drawing library in Ruby? (I'm thinking PHP shape drawing
> tools... but I don't want to use PHP...)
> 
> 
> 		
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