for (int s=p+1;s<entities.size();s++) {
Entity me = (Entity) entities.get(p);
Entity him = (Entity) entities.get(s);
if (me.collidesWith(him)) {
me.collidedWith(him);
him.collidedWith(me);
}
}
}
// draw the appropriate section of the tilemap based on the centre (hence the -(TANK_SIZE/2)) of