Class: NyanCat::NyanCat

Inherits:
Object
  • Object
show all
Defined in:
lib/nyancat.rb

Instance Method Summary collapse

Constructor Details

#initialize(io, options) ⇒ NyanCat

Returns a new instance of NyanCat.



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# File 'lib/nyancat.rb', line 45

def initialize(io, options)
  @running = false
  @io = io
  @term_width = options[:width] || 80
  @term_height = options[:height] || 24
  @mute = options[:mute] || false
  @hide_time = options[:hide_time] || false

  flavour = options[:flavour] || 'original'
  frames  = YAML.load_file(File.expand_path("../nyancat/#{flavour}/frames.yml", __FILE__))
  palette = YAML.load_file(File.expand_path("../nyancat/#{flavour}/palette.yml", __FILE__))

  @audio = File.expand_path("../nyancat/#{flavour}/audio.mp3", __FILE__) 

  # Calculate the width in terms of the output char
  term_width = @term_width / OUTPUT_CHAR.length
  term_height = @term_height

  min_row = 0
  max_row = frames[0].length

  min_col = 0
  max_col = frames[0][0].length

  min_row = (max_row - term_height) / 2 if max_row > term_height
  max_row = min_row + term_height if max_row > term_height

  min_col = (max_col - term_width) / 2 if max_col > term_width
  max_col = min_col + term_width if max_col > term_width

  # Calculate the final animation width
  @anim_width = (max_col - min_col) * OUTPUT_CHAR.length

  # Precompute frames
  @frames = frames.map do |frame|
    frame[min_row...max_row].map do |line|
      line.chars.to_a[min_col...max_col].map do |c|
        "\033[48;5;%dm%s" % [palette[c], OUTPUT_CHAR]
      end.join + "\033[m\n"
    end
  end
end

Instance Method Details

#reset ⇒ Object 



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# File 'lib/nyancat.rb', line 131

def reset()
  begin
    @io.puts("\033[0m\033c")
  rescue Errno::EPIPE => e
    # We failed to reset the TERM, IO stream is gone
  end
end

#run ⇒ Object 



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# File 'lib/nyancat.rb', line 88

def run()
  @running = true
  
  begin
    # Initialise term
    @io.printf("\033[H\033[2J\033[?25l")

    # Get start time
    start_time = Time.now()

    # Play audio
    audio_t = Thread.new { IO.popen("mpg123 -loop 0 -q #{@audio} > /dev/null 2>&1") } unless @mute || nil

    while @running
      @frames.each do |frame|
        # Print the next frame
        @io.puts frame

        # Print the time so far
        unless @hide_time
          time = "You have nyaned for %0.0f seconds!" % [Time.now() - start_time]
          time = time.center(@anim_width)
          @io.printf("\033[1;37;17m%s", time)
        end

        # Reset the frame and sleep
        @io.printf("\033[H")
        sleep(0.09)
      end
    end

  ensure
    # Ensure the audio thread is killed, if it exists
    audio_t.kill unless audio_t.nil?
    stop
    reset
  end
end

#stop ⇒ Object 



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# File 'lib/nyancat.rb', line 127

def stop()
  @running = false      
end