怎么样让BGM由近到远 - Project1

#==============================================================================
# ■ Scene_Map
#------------------------------------------------------------------------------
# 　处理地图画面的类。
#==============================================================================
class Scene_Map
alias _update update
#--------------------------------------------------------------------------
# ● 刷新画面
#--------------------------------------------------------------------------
def update
_update
check_bgm
end
#--------------------------------------------------------------------------
# ● 检查BGM
#--------------------------------------------------------------------------
def check_bgm
return unless $bgm
return unless $game_map.events[$event_id]
# 计算距离
x = ($game_player.x - $game_map.events[$event_id].x)**2
y = ($game_player.y - $game_map.events[$event_id].y)**2
$bgm.volume = 110 - Math.sqrt(x+y)*4
$game_system.bgm_play($bgm)
end
end
#==============================================================================
# ■ Interpreter (分割定义 8)
#------------------------------------------------------------------------------
# 　执行事件命令的解释器。本类在 Game_System 类
# 和 Game_Event 类的内部使用。
#==============================================================================
class Interpreter
#--------------------------------------------------------------------------
# ● 开始BGM
#--------------------------------------------------------------------------
def bgm_start(id)
return if $bgm
$event_id = id
$bgm = $game_system.bgm_memorize
end
#--------------------------------------------------------------------------
# ● 结束BGM
#--------------------------------------------------------------------------
def bgm_stop
$bgm = nil
$event_id = nil
end
end

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