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?
--
En ligne avec Thor 2.6a.
Alle Verallgemeinerungen sind gef?hrlich, sogar diese.
--- Alexandre Dumas der ?ltere
Received on Wed Jul 18 2001 - 20:43:33 BST