matrix.rb

require 'dxruby'

def simpleHash(x)
  x = x * 1103515245 + 12345
  return x & 2147483647
end

Window.width = 640
Window.height = 480
Window.bgcolor = [0, 0, 0]
Window.caption = "マトリックスもどき"
fontsize = 25
font = Font.new(fontsize, 'ＭＳ ゴシック')

characterType = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']

lines = Array.new(8) do
  x = rand(Window.width)
  y = rand(Window.height)
  Array.new(20) do |index|
    {'x'=>x, 'y'=>(y - index * fontsize), 'character1'=>characterType[rand(characterType.size)], 'character2'=>characterType[rand(characterType.size)]}
  end
end

# メインループ
Window.loop do
  lines.each do |line|
    line.each do |c|
      Window.drawFont(c['x'], c['y'], c['character1'], font, :color=>[0, 255, 0], :alpha=>128)
      Window.drawFont(c['x'], c['y'], c['character2'], font, :color=>[0, 255, 0], :alpha=>128)
      c['y'] += 5
      if c['y'] > Window.height
        c['x'] = simpleHash(c['x']) % Window.width
        c['y'] = 0
      end
    end
  end
end