fake.coffee

#= require jquery/jquery
#= require biginteger/biginteger
#= require_self

jQuery ->
  
  # configure

  design =
    width:  10
    height: 10

  color_depth = 16

  # count

  pixels_count = design.width * design.height
  all_colors_count = new BigInteger Math.pow(color_depth, 3)
  all_images_count = all_colors_count.pow pixels_count

  pixel_no_to_position = (pixel_no) ->
    x = Math.floor pixel_no / design.width
    y = pixel_no % design.height
    [x, y]

  pixel_to_rgb = (pixel) ->
    pixel_remain = [pixel].shift()
    color_base = color_depth
    rgb = []
    color_shift = color_depth / 2
    for channel_no in [0..2]
      color = pixel_remain % color_depth
      pixel_remain = (pixel_remain - color) / color_depth
      rgb.push color * 256 / color_depth + color_shift / 2
    rgb

  # example seed

  # image_seed = new BigInteger 0
  image_seed = [all_images_count].shift().subtract 1

  # print loop

  seed_remain = [image_seed].shift()
  print_base  = [all_colors_count].shift()

  for pixel_no in [0..(pixels_count-1)]
    la_pixel = seed_remain.remainder print_base
    seed_remain = seed_remain.subtract(la_pixel).divide all_colors_count

    console.log 'print (' + pixel_no_to_position(pixel_no) + ') to ' + pixel_to_rgb(la_pixel)