ninjaboyjohn

That works! Thanks!

I'm trying to create some simple randomly generated "obstacles" for my game. These obstacles are just singular playfield pixels that I turn on in playfield row 11 so they will scroll down during the next draw. The pixels are being created and turned off correctly, and everything seems to be running at full speed. The problem is that playfield pixels (seemingly inbetween rows 10 and 11) flash randomly at the bottom of the screen. I've tried putting my pixeldrawing code after drawscreen and the same thing occured. Below is the extracted code for my background - even with just the background code running, the flickering continues. If I rem out the pfpixel call for my created pixel, the flickering stops! Please help a newb out! Thanks! init COLUPF = 36 COLUBK = 44 scorecolor = 14 rem --- stores rand to add to the playfield uses r dim pfadd = r pfadd = 10 rem --- draw the playfield borders pfvline 0 0 11 pfvline 1 0 11 pfvline 30 0 11 pfvline 31 0 11 pfpixel 2 0 on:pfpixel 29 0 on:pfpixel 2 1 on:pfpixel 3 1 on pfpixel 28 1 on:pfpixel 29 1 on:pfpixel 2 2 on:pfpixel 28 2 on pfpixel 29 2 on:pfpixel 29 3 on:pfpixel 2 4 on:pfpixel 2 5 on pfpixel 3 5 on:pfpixel 2 6 on:pfpixel 29 6 on:pfpixel 28 7 on pfpixel 29 7 on:pfpixel 2 8 on:pfpixel 29 8 on:pfpixel 2 9 on pfpixel 3 9 on:pfpixel 2 10 on:pfpixel 3 10 on:pfpixel 29 10 on rem --- vertical bar on sides PF0=128 mainloop rem --- randomize the playfield rem -- first clear out old pixels pfhline 4 11 27 off rem -- then generate new pixel in row 11 between columns 4 and 27 inclusive pfadd = rand if pfadd > 72 then goto skip if pfadd > 48 then pfadd = pfadd - 48 if pfadd > 24 then pfadd = pfadd - 24 pfadd = pfadd + 3 pfpixel pfadd 11 on skip pfscroll down drawscreen goto mainloop