#!/usr/bin/env ruby

require 'rubygems'
require 'RMagick'

def gen_image(name, width, height)
  img = Magick::Image.new(width, height) do |i|
    i.background_color = Magick::Pixel.new(rand(Magick::MaxRGB), rand(Magick::MaxRGB), rand(Magick::MaxRGB), 0)
  end
  point_size = width / 8
  (d = Magick::Draw.new).annotate(img, width, height, 0, 0, name) do
    d.gravity, d.fill, d.pointsize = Magick::CenterGravity, 'white', point_size
  end
  img.write "img/#{name}"
end

if ARGV.size == 2
  width, height= ARGV.shift.split("x").map(&:to_i)
  Integer(ARGV.shift).times do |num|
    gen_image("%04d.png" % num,  width, height)
  end
else
  puts "[usage] #{$0} [width]x[height] [num]"
end