A colored and animated American flag in Ruby

flag.rb

#!/usr/bin/env ruby

def red(string)
  "\e[37;41m#{string}\e[0m"
end

def white(string)
  "\e[30;47m#{string}\e[0m"
end

def blue(string)
  "\e[1;37;44m#{string}\e[0m"
end

max_width = `tput cols`.to_i
stars_width = max_width * 0.40
spacing = (stars_width / 6).to_i

flag = []

(0..25).step(2).each_with_index do |row, index|
  flag[row] = (" " * max_width).split(//).map { |c| index.even? ? red(c) : white(c) }
  flag[row+1] = (" " * max_width).split(//).map { |c| index.even? ? red(c) : white(c) }
end

14.times do |row|
  stars_width.to_i.times do |col|
    char = " "
    case row % 3
    when 0
      char = "*" if (col - (spacing/2)) % spacing == 0
    when 1
      char = "*" if row != 13 && col >= spacing && col % spacing == 0
    end
    flag[row][col] = blue(char)
  end
end

throw = 2
increment = 0
step = 0.75

loop do
  canvas = []
  (flag.length + 2 * throw).times do |x|
    canvas[x] = []
    max_width.times do |y|
      canvas[x][y] = " "
    end
  end

  flag.each_with_index do |row, rindex|
    row.each_with_index do |col, cindex|
      x = (cindex / row.length.to_f) * (2 * Math::PI) + increment
      offset = Math.sin(x) * throw
      position = rindex + throw + offset
      canvas[position][cindex] = flag[rindex][cindex]
    end
  end

  canvas.each do |row|
    puts row.join
  end

  increment += step
  sleep 0.25
end

Added a simple animation using a sine wave
https://www.youtube.com/watch?v=MOcmBTGmfbk

Expressing patriotism from within a terminal. It doesn't get any better than this!