Como poner movimiento de camara en pokemon essentials

#==================================================================#
#==================================================================#
# #*****************# Efecto de camara v1.1, permite #
# #*** By Falcao ***# mover las camaras del juego al #
# #*****************# antojo del usuario #
# RMXP #
# makerpalace.onlinegoo.com V 1.5 #
#==================================================================#

module Camara

# Boton para activar la camara (Tecla "A" del teclado)
Button = Input::X

# Velocidad de desplazamiento de la camara (del 1 al 10)
Speed = 5

#Interruptor que desabilita o abilita el script (on, off)
CamaraDisable = 50

end

$xrxs = {} if $xrxs == nil

class Game_System
attr_accessor :camara
alias falcaoscroll_initialize initialize
def initialize
falcaoscroll_initialize
@camara = false
end
end

class Active_Arrow
def initialize
@arrow_up = Sprite.new
@arrow_up.bitmap = RPG::Cache.icon("047-Skill04")
@arrow_up.x = 325
@arrow_up.y = 40
@arrow_up.z = 200
@arrow_up.angle = 180
@arrow_up.visible = false

@arrow_left = Sprite.new
@arrow_left.bitmap = RPG::Cache.icon("047-Skill04")
@arrow_left.x = 32
@arrow_left.y = 220
@arrow_left.z = 200
@arrow_left.angle = 270
@arrow_left.visible = false

@arrow_down = Sprite.new
@arrow_down.bitmap = RPG::Cache.icon("047-Skill04")
@arrow_down.x = 316
@arrow_down.y = 446
@arrow_down.z = 200
@arrow_down.visible = false

@arrow_right = Sprite.new
@arrow_right.bitmap = RPG::Cache.icon("047-Skill04")
@arrow_right.x = 600
@arrow_right.y = 242
@arrow_right.z = 200
@arrow_right.angle = 90
@arrow_right.visible = false
end
def update
if $game_system.camara == true
case Input.dir4
when 2
@arrow_up.zoom_x = 1; @arrow_up.zoom_y = 1
@arrow_left.zoom_x = 1; @arrow_left.zoom_y = 1
@arrow_right.zoom_x = 1; @arrow_right.zoom_y = 1
@arrow_down.zoom_x = 1.4; @arrow_down.zoom_y = 1.4
when 4
@arrow_up.zoom_x = 1; @arrow_up.zoom_y = 1
@arrow_right.zoom_x = 1; @arrow_right.zoom_y = 1
@arrow_down.zoom_x = 1; @arrow_down.zoom_y = 1
@arrow_left.zoom_x = 1.4; @arrow_left.zoom_y = 1.4
when 6
@arrow_up.zoom_x = 1; @arrow_up.zoom_y = 1
@arrow_left.zoom_x = 1; @arrow_left.zoom_y = 1
@arrow_down.zoom_x = 1; @arrow_down.zoom_y = 1
@arrow_right.zoom_x = 1.4; @arrow_right.zoom_y = 1.4
when 8
@arrow_left.zoom_x = 1; @arrow_left.zoom_y = 1
@arrow_right.zoom_x = 1; @arrow_right.zoom_y = 1
@arrow_down.zoom_x = 1; @arrow_down.zoom_y = 1
@arrow_up.zoom_x = 1.4; @arrow_up.zoom_y = 1.4
end
@arrow_up.visible = true
@arrow_left.visible = true
@arrow_down.visible = true
@arrow_right.visible = true
else
@arrow_up.visible = false
@arrow_left.visible = false
@arrow_down.visible = false
@arrow_right.visible = false
end
end
def dispose
@arrow_up.dispose
@arrow_up.bitmap.dispose
@arrow_left.dispose
@arrow_left.bitmap.dispose
@arrow_down.dispose
@arrow_down.bitmap.dispose
@arrow_right.dispose
@arrow_right.bitmap.dispose
end
end

class Game_Player < Game_Character
include Camara
alias falcaocamara_update update
def update
falcaocamara_update
if Input.trigger?(Button) and @camera_action == nil and
$game_switches[CamaraDisable] == false
if $xrxs["xas"] == true
$game_switches[6] = true
$game_map.refresh
end
@walk_anime = false
$game_system.camara = true
@camera_action = 1
elsif Input.trigger?(Button) and @camera_action == 1 and
$game_switches[CamaraDisable] == false
center(x, y)
if $xrxs["xas"] == true
$game_switches[6] = false
$game_map.refresh
end
@move_speed = 4
@walk_anime = true
$game_system.camara = false
@camera_action = nil
end
if $game_system.camara == true
@move_speed = -20
unless $game_temp.message_window_showing
case Input.dir4
when 2
turn_down
$game_map.start_scroll(2, 1,Speed)
when 4
turn_left
$game_map.start_scroll(4, 1,Speed)
when 6
turn_right
$game_map.start_scroll(6, 1,Speed)
when 8
turn_up
$game_map.start_scroll(8, 1,Speed)
end
end
end
end
end

class Scene_Map
alias falcaoscroll_main main
def main
@arrow_active = Active_Arrow.new
falcaoscroll_main
@arrow_active.dispose
end
alias falcaoscroll_update update
def update
@arrow_active.update
falcaoscroll_update
end
end