背景图像未在Gosu上显示

Question

我现在正在尝试用Gosu和Ruby创建一个游戏。我遇到了一个问题，在我的代码中没有显示背景图像。我没有收到任何错误，但每当我启动应用程序时，我都会看到一个黑屏，我困惑于为什么，有人能帮助我吗？

require 'gosu'
require_relative 'player'
require_relative 'enemy'
require_relative 'bullet'
require_relative 'eb_bullet'
require_relative 'explosion'

class SectorFive < Gosu::Window
 WIDTH = 800
 HEIGHT = 600
 ENEMY_FREQUENCY = 0.03
 ENEMY_BULLET_FREQUENCY = 0.009
 def initialize
  super(WIDTH, HEIGHT)
  self.caption = "Sector Five"
  @background_image = Gosu::Image.new('images/start_screen.png')
end


def draw
 @background_image.draw(0,0,0)
end
end
window = SectorFive.new
window.show

Answer 1

缩进很笨拙，并且需要在SectorFive类中使用update方法，例如

require 'gosu'
#require_relative 'player'
#require_relative 'enemy'
#require_relative 'bullet'
#require_relative 'eb_bullet'
#require_relative 'explosion'

class SectorFive < Gosu::Window
#  ENEMY_FREQUENCY = 0.03
#  ENEMY_BULLET_FREQUENCY = 0.009

  def initialize(width=800, height=600)
    @width     = width
    @height    = height
    super width, height, false    # <-- fullscreen = false
    self.caption = "Sector Five"
    @background_image = Gosu::Image.new('images/start_screen.png')
  end

  def update                      # <-- updates @60hZ; game logic goes here
  end

  def draw
    @background_image.draw(0,0,0)
  end

end

window = SectorFive.new
window.show

...with子目录png和名为“png”的便携网络图形文件，此脚本加载一个800x600 startup_screen.png窗口，其中png文件左上角对齐。