no.rb

def tag_percentage
  total_tags = 0.0

  Article.all_tag_counts.each do |tag|
    total_tags += tag.count
  end

  return tag_percent = (count / total_tags * 100).ceil
end

def tag_popularity_as_hex(count)
  #most saturated colour possible, used for a highly used tag
  max_colour[] = [255.0, 0.0, 0.0]
  # least saturated colour possible, used for tags that are rarely used
  min_colour[] = [0.0, 255.0, 255.0]
  tag_percent = tag_percentage

  for i in 0..2
    range[i] = min[i] - max[i]
    one_percent_of_range[i] = range[i] / 100.0
    rgb_value[i] = (one_percent_of_range * tag_percent) + max_colour
  end

  hex = "#%02x%02x%02x" % rgb_value[]
end