Robin Gravel's Blog

Call SweepSprite() upon initialization so sprites are placed outside the screen boundry. Without that all the sprites at zero'd upon start, so the unused sprites are at position x=0,y=0.

Here's my code to place all sprites off screen:

void SweepSprites(void){
for (i=0;i!=32;i++){
sprites[i].y = 207;
}
updatesprites(0,64);
}

Further explanation. When sprite[?].y=208, it sets a flag sprite termination flag for the sprite for the rest of the array to not show up. So if you place a that number in sprite[3].y=208. Sprite 3 and up won't show up. if you're moving the sprite up and down in the area out of bound, it'll skip that number(C code I noticed skip this number when sprites move vertically).

I place my sprites I don't need at 207 so I don't trigger the sprite termination.