monitor = peripheral.wrap("top")
monitor.clear()
mw,mh = monitor.getSize()

function scale(x,y)

  x0 = (3.5 * (x-1) / mw) - 2.5
  y0 = (2 * (y-1) / mh) - 1
  return x0,y0
end

function getColor(iter)
  if iter == 0 then
    return colors.black
  end
  return colors.white
--  return bit.blshift(iter%100,1)
end

for i = 1,mw do
  for j = 1,mh do

    x0,y0 = scale(i,j)

    x = 0
    y = 0

    iter = 0
    maxIter = 1000

    while x*x + y*y < 2*2 and iter < maxIter do

      xTemp = x*x - y*y + x0
      y = 2*x*y
      x = xTemp

      iter = iter + 1

    end

    bgColor = getColor(iter)

    monitor.setBackgroundColor(bgColor)
    monitor.setCursorPos(j,i)
    monitor.write(" ")
    sleep(.1)
  end
end