function on.resize() W, H = platform.window:width(), platform.window:height() X0, Y0 = math.floor(W/2), math.floor(H/2) UNIT = math.floor(H/8) DT = {1/(2^4), 1/(2^18)} TOL = 1/10000 end function on.paint(gc) local x31, vx31, y31, vy31, x41…