PICO-8 source code to create circle grid motion graphics.

circlegrid.lua

r=128
t=0
num=4
rad=9
sp=0.5
function _draw()
	cls(13)
	val=sin(330/360)
	nnum=ceil(num/val)
	for i=0,num do
		for n=0,nnum do
			x1=r/num*i+n%2*r/num*0.5
			x2=r/num*i+(1-n%2)*r/num*0.5
			y=r/num*n*val
			
			ang=time()*sp+n/nnum
			rad1=(sin(ang)+1)*0.5*rad
			circfill(x1+1,y+1,rad1,1)
			circfill(x1,y,rad1,12)
			rad2=(sin(ang+0.5)+1)*0.5*rad
			circfill(x2+1,y+1,rad2,4)
			circfill(x2,y,rad2,10)
		end
	end
end