如何按开始游戏之后，追加难度选项？ - Project1

#==============================================================================
# ■ Scene_Title
#------------------------------------------------------------------------------
# 　处理标题画面的类。
#==============================================================================
class Scene_Title < Scene_Base
#--------------------------------------------------------------------------
# ● 开始处理
#--------------------------------------------------------------------------
alias qqeat_scene_title_start start
def start
qqeat_scene_title_start
create_command_window2
end
#--------------------------------------------------------------------------
# ● 结束处理
#--------------------------------------------------------------------------
alias qqeat_scene_title_terminate terminate
def terminate
@command_window2.dispose
qqeat_scene_title_terminate
end
#--------------------------------------------------------------------------
# ● 更新画面
#--------------------------------------------------------------------------
def update
super
@command_window.update
@command_window2.update
if Input.trigger?(Input::C)
if @command_window.active
case @command_window.index
when 0 #New game
close_command_window
open_command_window2
@command_window2.index = 0
when 1 # Continue
command_continue
when 2 # Shutdown
command_shutdown
end
elsif @command_window2.active
case @command_window2.index
when 0 # 简单
close_command_window2
command_new_game
when 1 # 普通
when 2 # 困难
end
end
elsif Input.trigger?(Input::B)
if @command_window2.active
close_command_window2
open_command_window
end
end
end
#--------------------------------------------------------------------------
# ● 生成难度命令窗口
#--------------------------------------------------------------------------
def create_command_window2
s1 = '简单'
s2 = '普通'
s3 = '困难'
@command_window2 = Window_Command.new(172, [s1, s2, s3])
@command_window2.x = (544 - @command_window2.width) / 2
@command_window2.y = 288
@command_window2.active = false
@command_window2.openness = 0
end
#--------------------------------------------------------------------------
# ● 开启命令窗口
#--------------------------------------------------------------------------
def open_command_window
@command_window.open
begin
@command_window.update
Graphics.update
end until @command_window.openness == 255
@command_window.active = true
end
#--------------------------------------------------------------------------
# ● 关闭命令窗口
#--------------------------------------------------------------------------
def close_command_window
@command_window.close
begin
@command_window.update
Graphics.update
end until @command_window.openness == 0
@command_window.active = false
end
#--------------------------------------------------------------------------
# ● 开启难度命令窗口
#--------------------------------------------------------------------------
def open_command_window2
@command_window2.open
begin
@command_window2.update
Graphics.update
end until @command_window2.openness == 255
@command_window2.active = true
end
#--------------------------------------------------------------------------
# ● 关闭难度命令窗口
#--------------------------------------------------------------------------
def close_command_window2
@command_window2.close
begin
@command_window2.update
Graphics.update
end until @command_window2.openness == 0
@command_window2.active = false
end
end

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