maze.lua

function _draw()
 cls(8)
 srand(5)

 -- Iterate every 8 square pixels of the screen.
 -- The `.5` is to make sure the points are at the center of each pixel.
 -- We'll draw one wall of the maze in each square.
 for y=.5,129,8 do
  for x=.5,129,8 do
   -- Progress in the rotation cycle. One rotation is [0..1]
   a=rnd()+t()/25

   -- Get the direction the wall should go.
   -- If we just used `u,v=cos(a)*4,sin(a)*4` then each wall would always be spinning.
   -- We'll alter these coordinates to get the desired effect.
   --
   --`mid` returns the middle of three numbers, it's basically a clamp function.
   -- By clamping circular coordinates, they can move in a square shape rather than a circular one.
   -- See the GIF below!
   u=mid(-4,4,cos(a)*120)
   v=mid(-4,4,sin(a)*120)

   -- Draw the wall as 4 lines stacked on top of each other.
   for i=0,3 do
    -- `i>2 and 7 or 2` makes the top white but the rest dark red.
    line(x+u,y+v-i,x-u,y-v-i,i>2 and 7 or 2)
   end
  end
 end
end

maze_clamp.gif