I decided to code a dodge-the-falling-thing game for fun/experience, even though there are half a million of them out there. I'm running into flicker problems 'cause I have to clear the screen every so often.

Screenie:
https://sites.google.com/site/seanga2/dropbox/flicker.gif?attredirects=0&d=1

I can't output a space to the previous location because of complexity related to when the "asteroid" goes off the end of the screen and appears on the top.

The source is here:
https://sites.google.com/site/seanga2/dropbox/RUNNER.8Xp?attredirects=0&d=1

Here's the full code, btw:

Code:

Thanks for that, Merthsoft. Would it not be better to erase and redraw the "sprites" than clearing the screen and redrawing them?

Also, something to note, utilizing lists is going to cause a huge slow down.

Absolutely. You're using a total of ten elements split between your two lists, so it's absolutely within reason for the sake of speed to unroll your loops and use a set of 10 real variables (A-Z, theta) instead. Take a look at most BASIC homescreen "racing" games for good examples of that technique.

If I do that it results in unimaginable complexity when I redraw them at the top of the screen.



But I can't do that without unwrapping all my loops. (repetition galore- code grows by factor of 3 min.) My main focus here is flicker.

You have:
Code:

Therefore, by unimaginable complexity, you mean 5 output statements. And a bit of glue logic for all the bits that I [...]ed.

Edit: To address your edit: Then instead of your ClrHome, loop over your five X,Y pairs, and print a space. You'll have to save your coordinates so that you'll be able to erase with them on the next iteration.

That's what I mean. I tried that. I was f***in hard to save the coords when I wrapped around, w/o adding a ton of list gunk.

Or you could do it the fun way (The way that I overuse a LOT). Strings! I could give an example if that actually seems feasible.

Actually, that's not a bad idea at all!

I have no Idea what you mean by using strings. (How to code et cetera) Can I get an example?

I think tifreak8x wrote a tutorial on using strings for this sort of thing; I'll take a look for it later if no one beats me to it.