[VX Script] RMVX MessageBack Changer

Code:
#==============================================================================

# ** Battlebacks VX

#------------------------------------------------------------------------------

#    by DerVVulfman

#    version 1.2

#    03-29-2008

#    RGSS2

#============================================================================== 

#

#  INTRODUCTION:

#

#  This system reintroduces the use of 'Battleback' graphics into your pro-

#  jects, something that was sadly lacking in tbe RPGMaker VX system.

#

#------------------------------------------------------------------------------

#

#  SCRIPT CALLS:

#

#  There's only one script call that you need to know.

#

#  --Changing Battlebacks--

#  Given that this system allows you to use 'Battlebacks, you may find a need

#  to 'change' the battleback in-game. Unfortunately, this can't be done with

#  a pre-rendered map event, so I had to make a script call:

#

#           $game_system.battleback = "filename"

#

#  The filename is whatever is stored within the folder that you have speci-

#  fied in the configuration section (in the BATTLEBACK_DIR value).

#  

#------------------------------------------------------------------------------

#

#  SCRIPT PLACEMENT:

#

#  As a core/re-insertion script, it returns the classic battle backgrounds

#  that many users became used to with other RPG gaming systems.

#

#  If this script is being used  with any other script that alters any dis-

#  played effect or any system in the battlesystem's spriteset window, then

#  those scripts will most likely be placed BELOW this script  as they will

#  most need access to the revised battle viewport.

#

#------------------------------------------------------------------------------

#

#  EDITS AND MODIFICATIONS:

#  

#  This system Aliases the following methods:

#  * initialize                     (Game_System)

#  * create_battleback              (Spriteset_Battle)

#  * create_battlefloor             (Spriteset_Battle)

#

#  This system adds the following methods:

#  * battleback                     (Cache)

#

#------------------------------------------------------------------------------

#

#  THANKS:

#

#  To Fantasy at RPG RPG Revolution for noticing a bug when using the 'Battle

#  Test' feature.

#

#------------------------------------------------------------------------------

#  TERMS AND CONDITIONS:

#

#  Free to use, even in commercial projects.  Just note that I need some form

#  of due credit... even a mere mention in some end titles.

#

#==============================================================================



   #========================================================================

   #  **  C  O  N  F  I  G  U  R  A  T  I  O  N      S  Y  S  T  E  M  **  #

   #========================================================================  

  

  # Name of directory (used in cache) 

    BATTLEBACK_DIR = "Graphics/Parallaxes/"



  # List of battlebacks by Map ID.

  #                    MapID    Filename                   

    BATTLEBACK_LIST = {1    =>  "Ocean", 

                       2    =>  "CloudySky"}

                       

  # The name of the battleback used

  # when using the Battle Test feature.

    BATTLEBACK_TEST = "Mountains"                       



                   

#==============================================================================

# ** Cache

#------------------------------------------------------------------------------

#  This module loads each of graphics, creates a Bitmap object, and retains it.

# To speed up load times and conserve memory, this module holds the created

# Bitmap object in the internal hash, allowing the program to return

# preexisting objects when the same bitmap is requested again.

#==============================================================================



module Cache

  #--------------------------------------------------------------------------

  # * Get Battleback Graphic

  #     filename : Filename

  #--------------------------------------------------------------------------  

  def self.battleback(filename)

    load_bitmap(BATTLEBACK_DIR, filename)

  end

end







#==============================================================================

# ** Game_System

#------------------------------------------------------------------------------

#  This class handles system-related data. Also manages vehicles and BGM, etc.

# The instance of this class is referenced by $game_system.

#==============================================================================



class Game_System

  #--------------------------------------------------------------------------

  # * Public Instance Variables

  #--------------------------------------------------------------------------

  attr_accessor :battleback               # filename of battleback

  #--------------------------------------------------------------------------

  # * Object Initialization

  #--------------------------------------------------------------------------

  alias bback_initialize initialize

  def initialize

    bback_initialize

    @battleback = nil

  end

end







#==============================================================================

# ** Spriteset_Battle

#------------------------------------------------------------------------------

#  This class brings together battle screen sprites. It's used within the

# Scene_Battle class.

#==============================================================================



class Spriteset_Battle

  #--------------------------------------------------------------------------

  # * Create Battleback Sprite

  #--------------------------------------------------------------------------

  alias bback_create_battleback create_battleback

  def create_battleback

    # Perform and exit for battletests

    if $BTEST

      if BATTLEBACK_TEST != nil 

        # Create Battleback sprite

        @battleback_sprite = Sprite.new(@viewport1)

        # Load image from cache

        @battleback_sprite.bitmap = Cache.battleback(BATTLEBACK_TEST)

        return

      else

        bback_create_battleback

        return

      end

    end

    # If map used 'called' battleback.  

    if $game_system.battleback != nil

      # Create Battleback sprite

      @battleback_sprite = Sprite.new(@viewport1)

      # Load image from cache

      @battleback_sprite.bitmap = Cache.battleback($game_system.battleback)    

    # If map has assigned battleback

    elsif BATTLEBACK_LIST.key?($game_map.map_id)

      # Create Battleback sprite

      @battleback_sprite = Sprite.new(@viewport1)

      # Load image from cache

      @battleback_sprite.bitmap = Cache.battleback(BATTLEBACK_LIST[$game_map.map_id])

    # Otherwise, as normal

    else

      # Perform the original call

      bback_create_battleback

    end

  end  

  #--------------------------------------------------------------------------

  # * Create Battlefloor Sprite

  #--------------------------------------------------------------------------  

  alias bback_create_battlefloor create_battlefloor

  def create_battlefloor

    # Disable battlefloor for existing battleback maps

    if BATTLEBACK_LIST.key?($game_map.map_id) or $game_system.battleback != nil

      @battlefloor_sprite = Sprite.new(@viewport1)

      return

    end

    # Disable for battletests with set battleback

    if $BTEST 

      if BATTLEBACK_TEST != nil

        @battlefloor_sprite = Sprite.new(@viewport1)

        return

      end

    end

    # Perform the original call

    bback_create_battlefloor

  end

end