18 Jul
2001
18 Jul
'01
8:43 p.m.
Tony Duell skrev:
> >Ok, my mind is still blown. How does a
light-pen drawing program work
> >then? (Or is a light-pen drawing program not possible?)
>
> The only light pen I've worked with is the Vectrex pen. And while a vector
> screen differs somewhat from a CRT (it's non-linear, which doesn't help
Eh?
First of all, I'm sorry, I realised after dispatching that message that I had
written "CRT", when what I meant was "raster screen".
For one thing, a vector display uses a CRT (and the
Vectrex certainly
does, I have one, and I've been inside it often enough), and for another,
what are you suggesting is non-linear about a vector display. Any
reasonable vector display has very linear X and Y amplifiers.
What's non-linear about a vector screen is that the beam doesn't move in any
particular pattern.
> decoding), the drawing program simply projected a
dot on the screen, which
> was moved using the pen. IOW, the dot was registered by the pen, and
> placing the
It's a long time since I've used the Vectrex
lightpen, but I seem to
remember it sweeping a line across the screen and then down the screen
(or maybe the reverse) to determine where the lightpen must be if it
'lost' it.
That's nice. Did you ever figure out how to use it for anything else than
drawing a big umbrella?
--
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