calculateAvgColourNumber.rb

calculateAvgColourNumber.rb

#!/usr/bin/env ruby
require 'json'
require 'pp'

pages = 0
total = 0
perpage = 0

r, g, b = 0, 0, 0
total_photos = 0

ARGF.each_line do |line|
  serializedJSON = line
  flickr_data_page =  JSON.parse(serializedJSON)
  page = flickr_data_page["photos"]["page"].to_i
  if page == 1
    total = flickr_data_page["photos"]["total"].to_i
    perpage = flickr_data_page["photos"]["perpage"].to_i
    pages = flickr_data_page["photos"]["pages"].to_i
  end
  if page == pages
    num_photos = total % perpage
  else
    num_photos = perpage
  end
  $stderr.printf "page:%d of:%d\n", page, pages
  0.upto num_photos-1 do |photo_index|
    if  flickr_data_page["photos"]["photo"][photo_index].has_key?("avg_colour_m")
      hex =  flickr_data_page["photos"]["photo"][photo_index]["avg_colour_m"]["variable"][6]["statistic"][0]["hex"][0].to_i(16)
      blue = hex % 256
      green = (hex >> 8) % 256
      red = (hex >> 16) % 256
      $stderr.printf "r:%d g:%d b:%d\n",red,green,blue
      r += red
      g += green
      b += blue
      total_photos += 1
    end
  end
end
printf "avg r:%d g:%d b:%d hex:%x\n",r/total_photos, g/total_photos, b/total_photos, b/total_photos + g/total_photos * 256 + r/total_photos * 65536