commando-ticker

#!/usr/bin/env ruby
require_relative 'commando-helpers.rb'

require 'chunky_png'

program :description, 'TBD'
program :version, '1.0.0'

command :loop do |c|
  c.description = 'TBD'
  c.option '--texture FILE'
  c.option '--output DIR', String, 'Output directory'
  c.option '--width String', String, 'Cropped width'
  c.action do |args, options|
    options.default \
      texture: "./texture.png",
      output: "./output",
      width: "3442"

    options.texture = File.expand_path(options.texture)
    options.output = File.expand_path(options.output)
    options.width = options.width.to_i

    command_header(c, options)

    if ! File.directory?(options.output)
      warning "Output directory '#{options.output}' does not exist, creating it..."
      Dir.mkdir(options.output)
    end

    texture = ChunkyPNG::Image.from_file(options.texture)

    # output is bigger than input. just tile along x
    if options.width > texture.width
      out = ChunkyPNG::Image.new(options.width, texture.height, "ffffff")

      repeat, remainder = options.width.divmod(texture.width)
      repeat.times do |i|
        # tile on x repeat times
        out.replace!(texture, i * texture.width, 0)

        # fill any remainder on last
        if (i + 1) == repeat && remainder > 0
          texture.crop!(0, 0, remainder, texture.height)
          out.replace!(texture, options.width - remainder, 0)
        end  
      end

      filename = "0000.png"
      out.save("#{options.output}/#{filename}")
      puts "Wrote #{filename}..."
    else
      (0..texture.width).each do |i|
        # create full sized out frame
        out = ChunkyPNG::Image.new(texture.width, texture.height, "ffffff")

        # slide head over by i
        head = texture.crop(i, 0, texture.width - i, texture.height)

        # place at front
        out.replace!(head, 0, 0)

        # crop tail with remainder i
        tail = texture.crop(0, 0, i, texture.height)

        # append tail after head
        out.replace!(tail, texture.width - i, 0)

        # crop out to options.width
        out.crop!(0, 0, options.width, texture.height)

        # write to disk
        filename = "#{"%04d" % i}.png"
        out.save("#{options.output}/#{filename}")
        puts "Wrote #{filename}..."
      end
    end
  end
end
default_command :loop