Subject: Re: [stella] Gas gauge - revisited From: Manuel Polik <manuel.polik@xxxxxxxxxxx> Date: Tue, 13 Mar 2001 11:30:17 +0100 |
Joe Grand wrote: > I am trying to make the gauge two-color (e.g. red underneath and green for > the actual "time remaining"). With playfield graphics only, I was thinking > of just drawing the red data on one frame and the green data on the next > frame and alternate that way - I wouldn't assume the eye would see a > flicker. You'd definitely see it flicker, since you can see the colors only on 50% of the viewing time. It doesn't help that they're not overlayed. > I started to try this on the airplane last night but my battery > died before I could finish. Is this worth pursuing, or would there be an > easier way? The easiest way would be faking it with the background color, like Chris suggested. Let's say, you'd do a defined background color change during a scannline like this: <-- Green --><--------- normal BG color ------------> | Cycle X Now, you'd always change the background color at the beginning of a scannline and again on cycle X. Now you can easily draw a growing red PF bar within the green bar. > The gauge doesn't have to have very high-resolution, but it would be nice > if it was a little higher than standard playfield graphics. I'm using both > P0 and P1 to draw the "SCSISIDE" logo on the same lines that I hope to have > the gauge. Maybe I could use playfield graphics for the red and draw the > green data "on top" using missle? The above way will work with your logo too and don't interfere with it. Adding a missile for a higher resolution would be possible too, I think. This adds two more color changes though, so you'd have to produce very tight code here. But I'd say it could work. > Although not currently very exciting, I will post source of my playfield > graphics (which is just a modified version of J.V. "Matt" Matthews demo of > asymmetric playfield drawing from October 1996) if people are interested (I > can't do it now since it is on my laptop which isn't with me) Go ahead & post it. Greetings, Manuel - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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