World: r3wp

I suspect it is unnecessary for the task at hand, and would complicate 
the task somewhat.

still, it would be a good demo :)

I'd love to see a demo of an overview of graphs updated in realtime 
from any source. any.

of any graph in any language or just Rebol?

well for starters Rebol, but what if you could mix data like that 
and then just display it, no matter if it's CVS, rebol blocks or 
something measured off the serial port from a physical device.

sounds like you want to make a rebol oscilloscope

Is the stock-market data available somewhere online?

actually I think the hardest part would be to display a pretty graph 
:-) retrieving data could be done from within the graph face

I don't know about raw stock data...

Temperature data is also good for that.

stock market data is available from yahoo I believe, but delayed 
by 15 mins or something

graham: an oscilloscope could be a bit too intensive :-)

Or sea-level (changes with tide and weather).

or Canvas release rates

Wind direction.

lol

release rates contra size in kB

I guess I'd better find some docs on the draw dialect and see how 
easily this could be done.

It could be nice to have general graphing tools for Rebol like RRDTool 
which is a very powerful (but complex) graphing package for Linux

A start:

view layout [box white effect [draw [pen black line 0x100 10x80 20x85 
30x50 40x60 50x65 60x55 70x40 80x50 90x20]]]

or gnuplot

To change data, you could do:
clear next find face/effect/draw 'line
append face/effect/draw data-block

show face

what about scatter plots ?

would be as easy to update ?

Is that points?

yes.

view layout [box white effect [draw [pen none fill-pen black circle 
10x80 4 circle 20x85 4 circle 30x50 4 circle 40x60 4 circle 50x65 
4 circle 60x55 4 circle 70x40 4 circle 80x50 4 circle 90x20 4]]]

Update is almost as easy, just put circle in front and radius (4) 
behind the coords.

Picking data online and show a graph could maybe be an one-liner. 
:-)
Only with REBOL! (TM)

do points have to be done with circles ?

I guess so. Isn't a dot on a monitor a very small circle? Just change 
radius to 1 or 0.5 or something.

a dot on my monitor is a little square :)

:-) A one-pixel dot:

view layout [box white effect [draw [translate 0.5 0.5 anti-alias 
off pen none fill-pen black circle 50x50 0.5]]]

cool.

exactly one pixel too.

Looking carefully at my laptop screen, it's a grid of square pixels.

The translate move the center of the circle into the middle of a 
pixel. Radius of 0.5 then means, the circle won't go into neighbour 
pixels.

Perhaps you can incorporate a graphing module in Canvas :)

Without the translate, 4 pixels would be black.

Graham, certainly! :-)

anim-graph ?

That's the thing about great software; it can be used by others in 
ways the author never conceived

you could do really weird stuff with that. how about live graphs 
in a presentation?

Don't know if quick-plot by Matt Licholai would help you guys in 
any way.

I know it can be found by googling q-plot.r.  Ladislav has done some 
work that used q-plot, not sure if he's enhanced it or if anyone 
else has.

There is a window face option named "all-over", that will "Causes 
the over event to report a continuous stream of mouse positions as 
the mouse moves over the face". I use it in Canvas, but there seem 
to be a problem. After a while, when I haven't touched the computer 
for some time, it seems, that the all-over option is canceled. It 
can be seen in Canvas, that the coords in the title-bar isn't updated, 
when the mouse is moved.

Does anyone know something about this? I've checked RAMBO, but couldn't 
find anything about it.

all-over was in some very early beta View days  the default option. 
Later on we found out, that it causes way too much flood of events, 
so it was changed and all-over came to its life .....