Sorry for not being too much present here...

for apologize I want to show you an idea I had about the similarities between Coroutines in lua and gears.

then, on the base of circle, I have programmed a physical model which can recreate the gear movement, like a clock in fact ( I think I'll need objects in the further version).

The code above is only the gear creating function, please try it and tell me what you think about that idea.

require("draw") showgraph(1) draw.onbuffer(1) pi = 3.141592654 function rouage ( x,y,r,t,pas,o,p,a ) e = 0 for i=t, 2*pi+pas , pas do e = e+1 if e%2 == 0 then r = r+a draw.line ( x+(r-a)*math.cos(i), y+(r-a)*math.sin(i), x+r*math.cos(i), y+r*math.sin(i) ) else r = r-a draw.line ( x+(r+a)*math.cos(i), y+(r+a)*math.sin(i), x+r*math.cos(i), y+r*math.sin(i) ) end draw.line ( x+r*math.cos(i), y+r*math.sin(i), x+r*math.cos(i+pas), y+r*math.sin(i+pas) ) r = r - pas*o end end roue1 = coroutine.create ( function () pa = pi/5 while true do for j=0, 2*pa, 0.03*pi do rouage ( 75,100,50,j,pa,0,1,10) coroutine.yield () end end end ) while not testkey(K_EXE) do draw.clear () coroutine.resume ( roue1 ) draw.update () end

Hope you'll enjoy It

See ya later