narrative-rotate.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

require 'json'

def rotate(up)
  if up > 800
    return 90
  elsif up > 140
    return 180
  elsif up < -198
    return 270
  elsif up < 60
    return 0
  end
  return 0
end

Dir.glob("*.json").each do |json|
  jpeg = json.gsub('.json', '.jpg')
  next unless File.exist? jpeg

  j = JSON.parse(open(json).read)
  up = j['acc_data']['samples'][0][1].to_i
  system('convert', jpeg, '-rotate', rotate(up).to_s, "#{jpeg.gsub('.jpg', '-2.jpg')}")
end