17 Jul
2001
17 Jul
'01
8:55 a.m.
At 06:27 PM 7/16/01 -0400, Megan wrote:
I think the technical term for that is a "cursor". :-)
- John
Ok, my mind is
still blown. How does a light-pen drawing program work
then? (Or is a light-pen drawing program not possible?)
By putting up some sort of target which does provide the light-pen
with a light signal. The target is designed in such a way that you
cannot move the pen without hitting some part of it, and the software
sees a light-pen hit and *re-centers* the target on that point,
effectively moving it to where the pen is now pointing.