dynamic drawing in web page

[barbaros]

Hello everybody,

I need to put some dynamic drawings on my web page. More precisely, I
need to draw a number of geometric figures (circles, rectangles) which
evolve into a graphics windows according to some law (a little bit like
the solar system). I need also to have several fields aside the window,
where the visitor can change values for several significant parameters
(like the mass of each body).

Could you please suggest a solution (preferably not involving hundreds
of lines of code) ? The computations should be performed on the client
machine.

Thank you. Cristian Barbarosie http://cmaf.fc.ul.pt/~barbaros