sine

local scr_x, scr_y = term.getSize()

local doit = function(move)
  if not move then move = 0 end
  local res1,res2
  for a = 1, scr_y do
    for b = 1, scr_x do
      local x = b+math.floor(scr_x/2)
      local y = a-math.ceil(scr_y/2)
      res1 = math.abs( math.floor(math.sin((x/7)+move)*6) - y ) <= 2
      term.setCursorPos(b,a)
      if res1 then
        term.blit(" ","7","7")
      else
        term.write(" ")
      end
      res2 = math.abs( math.floor(math.cos((x/4)+(move*4))*3) - y+2 ) <= 1
      term.setCursorPos(b,a)
      if res2 then
        term.blit(" ","8","8")
      else
        if not res1 then
          if (x % 2 == 0) and ((y+math.floor(move*-10)+(x % 5)) % 5 <= 1) then
            term.blit("|","7","f")
          else
            term.write(" ")
          end
        end
      end
    end
  end
end

while true do
  for a = 1, 900 do
    --term.clear()
    doit(a/10)
    sleep(0.05)
  end
end