#==============================================================================
# ★ BattleBackEx 1.0 by USK
#------------------------------------------------------------------------------
# 戦闘背景をスクロール可能にします。
#==============================================================================
=begin
戦闘背景に用いる画像ファイルの名前に(x軸方向の速度,y軸方向の速度)と付け足すと
その画像がスクロールするようになります。
例 battkeback(-2,1.5).png
=end
#==============================================================================
# ■ Spriteset_Battle
#==============================================================================

class Spriteset_Battle
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  alias :usk_pb_create_battleback1 :create_battleback1
  def create_battleback1
    if battleback1_name
      @back1_sprite = Plane_Battle.new(@viewport1, battleback1_name)
      @back1_sprite.bitmap = battleback1_bitmap
      @back1_sprite.z = 0
    else
      usk_pb_create_battleback1
    end
  end
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  alias :usk_pb_create_battleback2 :create_battleback2
  def create_battleback2
    if battleback2_name
      @back2_sprite = Plane_Battle.new(@viewport1, battleback2_name)
      @back2_sprite.bitmap = battleback2_bitmap
      @back2_sprite.z = 1
    else
      usk_pb_create_battleback2
    end
  end
end

#==============================================================================
# ■ Plane_Battle
#==============================================================================

class Plane_Battle < Plane
  attr_accessor :x, :y
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  def initialize(viewport, fname = "")
    super(viewport)
    @dx = @dy = 0
    if fname =~ /\(([-\.\d]+),([-\.\d]+)\)/
      @dx, @dy = $1.to_f, $2.to_f
    end
  end
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  def bitmap=(bitmap)
    super(bitmap)
    @ox = (bitmap.width - Graphics.width) >> 1
    @oy = (bitmap.height - Graphics.height) >> 1
  end
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  def update
    @flag = true
    self.ox = @ox = (@ox + @dx) % bitmap.width
    self.oy = @oy = (@oy + @dy) % bitmap.height
    @flag = false
  end
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  def ox=(ox)
    super(ox) if @flag
  end
  #--------------------------------------------------------------------------
  # ● 
  #--------------------------------------------------------------------------
  def oy=(oy)
    super(oy) if @flag
  end
end