Sample of drawing text with Gosu. Experiment how factor_x works.

gistfile1.rb

require 'gosu'

class GameWindow < Gosu::Window
  # 1行の高さ(=フォントサイズ)
  LINE_HEIGHT =20
  # ウィンドウの高さ(行数)
  LINES_IN_WINDOW = 24

  def initialize
    super(640, LINE_HEIGHT * LINES_IN_WINDOW, false)
    self.caption = "Gosu Tutorial Game"

    @font = Gosu::Font.new(self, Gosu::default_font_name, 20)
  end

  def update
  end

  def draw
    # ウィンドウの高さ分、factor_xを変えながら埋め尽くしてみる。
    LINES_IN_WINDOW.times do |i|
      factor_x = i.to_f / 10
      @font.draw( factor_x.to_s + ":Hello World!", 0, LINE_HEIGHT * i, 1, factor_x, 1.0, Gosu::Color::WHITE)
    end
  end
end