Re: [OpenVerse] Any progress on the whiteboard?

[Anders Eurenius <gargoyle@histgr430.sn.umu.se>]

Andy Goth wrote:
> 
> Cruise, have you thought much about a shared whiteboard?
> 
> It would be pretty cool to have rooms where privileged users can doodle
> on the background image.  I think it would be implemented with messages
> that indicate things such as line drawing, pixel plotting,
> circles/ellipses, rectangles, text, and maybe some other drawing
> elements.
> 
> Why privileged?  I'd hate to draw some important diagram just in time
> for some hooligan to come and paint a huge white rectangle over it.

I have been thinking about multiuser, nonlinear (selective) undo for a
while, but then, mostly text. Vector graphics is a nice addition. Thank
you.

> Which brings up another question... what if I draw for a while and then
> someone new enters the room?  Maybe he can be sent a background image
> that already contains all the new drawings on it.

This shouldn't really be much of a problem; vectors are cheap. That is,
saying "a line from (a,b) to (p,q)" requires a lot less information than
saying "a white dot, another white dot...". (as nauseam)

Just keep some kind of buffer, and dump it on newcomers in a batch.
The only problem I see is that if you'd paint for, say, 4 weeks
straight,
the batch would hold lots of stuff that's been painted over since.

> I know this brings up plenty more questions and obstacles, and it would
> probably require several mini rewrites, so I don't expect you to drop
> everything and put in a weeklong orgy of coding to satisfy me, but
> please think about it.
> 
> Unununium
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