Help with Zeriab's Caterpillar

Hello 
I'm not new to RMXP but only recently started scripting. I can create simple Scenes and Windows almost from scratch and i can edit some scripts (except very complex ones.)

I'm using Zeriab's Caterpillar Script because it allows me to interact with an Event on a map and can be controlled by a switch.

Spoiler for "Zeriab's Caterpillar Script":

Code: [Select]

#==============================================================================
# ** Zeriab's Caterpillar Script
#------------------------------------------------------------------------------
# Zeriab
# 1.0
# 2008-08-16
#------------------------------------------------------------------------------
# This script creates a caterpillar of the party members by using events.
#------------------------------------------------------------------------------
# Paste this script just above main.
#
# Put \cat_actor[3] in the name of an event and it will be considered the event
# for the actor with id 3. The name could for example be "Cyrus\cat_actor[3]"
#
# The switch number specified with CATERPILLAR_ACTIVE_SWITCH (default is 23) is
# used to determine whether the events should be positioned in the caterpillar
# or not. Then the switch is off they are just like any other event.
#
# The REMOVE_VISIBLE_ACTORS (default is true) is used to determine whether
# actor event not in the party should be erased or not.
# If it is set to an integer rather than true or false the switch with the
# corresponding id is used. For example REMOVE_VISIBLE_ACTORS = 21 will allow
# you to determine whether the events should be erased or not depending whether
# switch 21 is OFF or ON.
#
# The MAX_ACTORS (default is 4) is used to determine how many player moves
# should be remembered. Only change this if you can have a party with more than
# 4 actors.
#==============================================================================
class Game_Caterpillar
  CATERPILLAR_ACTIVE_SWITCH = 23
  REMOVE_VISIBLE_ACTORS = false
  MAX_ACTORS = 2
  ##
  # Initialize the caterpillar
  #
  def initialize
    @actors = []
    @actor_id_to_event = {}
    @move_list = []
  end
  ##
  # Clear the caterpillar data
  #
  def clear
    @actors.clear
    @actor_id_to_event.clear
    @move_list.clear
  end
  ##
  # Add an actor event to the caterpillar
  #
  def add_actor(event, actor_id)
    @actor_id_to_event[actor_id] = event
    event.move_list.clear
    added = false
    for actor in $game_party.actors
      if actor.id == actor_id
        @actors << event
        event.moveto($game_player.x, $game_player.y)
        added = true
      end
    end
    if remove_visible_actors? && !added && $game_switches[CATERPILLAR_ACTIVE_SWITCH]
      event.erase
    end
  end
  ##
  # Check if visible actors should be removed
  #
  def remove_visible_actors?
    if REMOVE_VISIBLE_ACTORS.is_a?(Integer)
      return $game_switches[REMOVE_VISIBLE_ACTORS]
    else
      return REMOVE_VISIBLE_ACTORS
    end
  end
  ##
  # If the game player has been center. I.e. teleported somewhere.
  #
  def center
    # Check if the caterpillar is active
    return unless $game_switches[CATERPILLAR_ACTIVE_SWITCH]
    # Clear the move_llist
    @move_list.clear
    # Refresh the caterpillar
    update
    # Move the actors to the new place
    for event in @actors
      event.moveto($game_player.x, $game_player.y)
      event.move_list.clear
    end
  end
  ##
  # Refresh the caterpillar. (Use sparingly)
  #
  def refresh
    # Check if the caterpillar is active
    return unless $game_switches[CATERPILLAR_ACTIVE_SWITCH]
    # Clear the data
    clear
    # Check each event
    for event in $game_map.events.values
      if event.is_a?(Game_Event)
        event.check_caterpillar
      end
    end
    # Center the events around the player
    center
    # Update the caterpillar
    update
  end
  ##
  # Register a player move
  #
  def register_player_move(move_speed, *args)
    # Check if the caterpillar is active
    return unless $game_switches[CATERPILLAR_ACTIVE_SWITCH]
    # Add the new command
    @move_list.unshift([move_speed, args])
    # Append the new moves to the caterpillar events
    update_actor_movement
    # Check if the last command should be removed
    if @move_list.size > MAX_ACTORS + 1
      # Remove the last move command
      @move_list.pop
    end
  end
  ##
  # Updates the actors movement.
  #
  def update_actor_movement
    for i in 0...@actors.size
      if i + 1 < @move_list.size
        command = @move_list[i + 1]
        actor = @actors[i]
        actor.move_list.unshift(command[1])
        actor.move_speed = command[0]
      end
    end
  end
  ##
  # Update the caterpillar.
  #
  def update
    # Check if the caterpillar is active
    return unless $game_switches[CATERPILLAR_ACTIVE_SWITCH]
    old_actors = @actors
    @actors = []
    # Create a copy of the party actors
    caterpillar = $game_party.actors.dup
    # Remove the first element
    caterpillar.shift
    # Go through each actor that's possible present in the caterpillar
    for actor in caterpillar
      event = @actor_id_to_event[actor.id]
      unless event.nil?
        @actors << event
        event.unerase if remove_visible_actors?
        event.character_name = actor.character_name
      end
    end
    if remove_visible_actors?
      # Go through the old actors to see if any should be erased
      for actor in old_actors
        unless @actors.include?(actor)
          actor.erase
        end
      end
    end
  end
  ##
  # Unerase all erased actor events
  #
  def unerase_all
    for event in @actor_id_to_event.values
      event.unerase
    end
  end
  ##
  # Erase actor events not in the party
  #
  def erase_non_party_events
    for event in @actor_id_to_event.values
      event.erase unless @actors.include?(event)
    end
  end
end

class Game_Player < Game_Character
  unless self.method_defined?('zeriab_caterpillar_game_player_center')
    alias_method(:zeriab_caterpillar_game_player_center, :center)
  end
  ##
  # When the player is centered (i.e. teleported somewhere)
  #
  def center(*args)
    zeriab_caterpillar_game_player_center(*args)
    $game_system.caterpillar.center
  end
 
  ##
  # Generate registration of player moves to the caterpillar code
  #
  MOVE_METHODS = ['move_down', 'move_left', 'move_right', 'move_up',
                  'move_lower_left', 'move_lower_right', 'move_upper_left',
                  'move_upper_right', 'jump']
 
  # Go through each method
  for method in MOVE_METHODS
    # Create the script for the specific method
    PROG = <<_END_
  def #{method}(*args)
    x,y = self.x, self.y
    super(*args)
    unless self.x == x && self.y == y
      $game_system.caterpillar.register_player_move(@move_speed, '#{method}', args, [self.x, self.y])
    end
  end
_END_
    # Run the script
    eval(PROG)
  end
end

class Module
  # Prevent adding the method again should it already be present.
  unless self.method_defined?('attr_sec_accessor')
    def attr_sec_accessor(sym, default = 0)
      attr_writer sym
      attr_sec_reader sym, default
    end
   
    def attr_sec_reader(sym, default = 0)
      sym = sym.id2name
      string = "def #{sym};" +
               "  @#{sym} = #{default}  if @#{sym}.nil?;" +
               "  @#{sym};" +
               "end;"
      module_eval(string)
    end
  end
end

class Game_System
  attr_sec_accessor :caterpillar, 'Game_Caterpillar.new'
end

class Game_Event < Game_Character
  ##
  # Attributes
  #
  attr_sec_accessor :move_list, '[]'
  attr_accessor     :move_speed
  attr_writer       :character_name
  ##
  # Aliases
  #
  unless self.method_defined?('zeriab_caterpillar_game_event_passable?')
    alias zeriab_caterpillar_game_event_initialize :initialize
    alias zeriab_caterpillar_game_event_passable?  :passable?
    if Module.constants.include?('SDK')
      alias zeriab_caterpillar_game_event_update_movement  :update_movement
    else
      alias zeriab_caterpillar_game_event_update  :update
    end
  end
  ##
  # Object Initialization
  #
  def initialize(map_id, event, *args)
    # Default update
    zeriab_caterpillar_game_event_initialize(map_id, event, *args)
    # Check if the caterpillar is active
    return unless $game_switches[Game_Caterpillar::CATERPILLAR_ACTIVE_SWITCH]
    # Check for caterpillar actor denomination
    check_caterpillar
  end
  ##
  # Check for caterpillar actor denomination
  #
  def check_caterpillar
    # Check for caterpillar actor denomination (Last is used if more present)
    @event.name.gsub(/\\cat_actor\[([0-9]+)\]/i) {@caterpillar_actor = $1 }
    # Check if an valid denomination is found.
    if @caterpillar_actor.is_a?(String)
      @caterpillar_actor = @caterpillar_actor.to_i
      if $data_actors[@caterpillar_actor].nil?
        @caterpillar_actor = nil
      else
        $game_system.caterpillar.add_actor(self, @caterpillar_actor)
      end
    end
  end
  ##
  # Check passability
  #
  def passable?(*args)
    if @caterpillar_actor.nil? || move_list.empty? ||
       !$game_switches[Game_Caterpillar::CATERPILLAR_ACTIVE_SWITCH]
      return zeriab_caterpillar_game_event_passable?(*args)
    else
      return true
    end
  end
  ##
  # SDK and Non-SDK stuff
  #
  if Module.constants.include?('SDK')
    ##
    # Update Movement
    #
    def update_movement
      if @caterpillar_actor.nil? || move_list.empty? ||
         !$game_switches[Game_Caterpillar::CATERPILLAR_ACTIVE_SWITCH]
        return zeriab_caterpillar_game_event_update_movement
      end
      # Interrupt if not stopping
      if jumping? or moving?
        return
      end
      # Retrive the command
      command = move_list[0]
      # Call the command
      method(command[0]).call(*command[1])
      # Make sure the x and y are right in the end
      @x, @y = *command[2]
      # Remove the command
      move_list.pop
    end
  else # Non-SDK version
    ##
    # Update Movement
    #
    def update
      # Interrupt if not stopping
      no_move = jumping? or moving?
      # Update
      zeriab_caterpillar_game_event_update
      # Check if it should return
      if $game_switches[Game_Caterpillar::CATERPILLAR_ACTIVE_SWITCH] &&
         @caterpillar_actor != nil && !move_list.empty? && !no_move
        # Retrive the command
        command = move_list[0]
        # Call the command
        method(command[0]).call(*command[1])
        # Make sure the x and y are right in the end
        @x, @y = *command[2]
        # Remove the command
        move_list.pop
      end
    end
  end
  ##
  # Bring back an erased event
  #
  def unerase
    @erased = false
    refresh
  end
end

class Game_Map
  ##
  # Aliases
  #
  unless self.method_defined?('zeriab_caterpillar_game_map_setup')
    alias zeriab_caterpillar_game_map_setup :setup
  end
  ##
  # Transfer Player
  #
  def setup(*args)
    $game_system.caterpillar.clear
    zeriab_caterpillar_game_map_setup(*args)
  end
end

class Game_Switches
  ##
  # Aliases
  #
  unless self.method_defined?('zeriab_caterpillar_game_switches_setter')
    alias zeriab_caterpillar_game_switches_setter :[]=
  end
  ##
  # Setter
  #
  def []=(switch_id, value, *args)
    zeriab_caterpillar_game_switches_setter(switch_id, value, *args)
    if switch_id == Game_Caterpillar::CATERPILLAR_ACTIVE_SWITCH
      $game_system.caterpillar.refresh
    elsif switch_id == Game_Caterpillar::REMOVE_VISIBLE_ACTORS
      if value
        $game_system.caterpillar.erase_non_party_events
      else
        $game_system.caterpillar.unerase_all
      end
    end
  end
end

class Interpreter
  ##
  # Aliases
  #
  unless self.method_defined?('zeriab_caterpillar_interpreter_command_129')
    alias zeriab_caterpillar_interpreter_command_129 :command_129
    alias zeriab_caterpillar_interpreter_command_322 :command_322
  end
  ##
  # Change Party Member
  #
  def command_129
    result = zeriab_caterpillar_interpreter_command_129
    $game_system.caterpillar.refresh
    return result
  end
  ##
  # Change Actor Graphic
  #
  def command_322
    result = zeriab_caterpillar_interpreter_command_322
    $game_system.caterpillar.update
    return result
  end
end


I've already created a scene for when you press the X button (A key on keyboard) and it is perfectly functional:

Spoiler for "My Scene_Come":

Code: [Select]

#==============================================================================
# **Scene_Come
#------------------------------------------------------------------------------
#  This scene will handle catterpillar "COME" comand input
#==============================================================================

class Scene_Come
 
  def initialize(menu_index = 0)
   @menu_index = menu_index #Store the cursor position
  end 
 
  def main
   
    @background = Spriteset_Map.new #draw background
   
    @upper_window = Window_Comehelp.new
    @upper_window.update(" ")
   
    s1 = "Come over here"
    s2 = "Stay there"

    @come_window = Window_Command.new(320, [s1, s2])
    @come_window.x=160
    @come_window.y=64
    @come_window.back_opacity = 160
    @come_window.index = @menu_index
   
   
   
    # keep updating:
    Graphics.transition
    loop do
      Graphics.update
      Input.update
      update
      if $scene != self
        break
      end # if cond
    end # loop
   
    # execute when exiting the scene
    Graphics.freeze
    @background.dispose
    @upper_window.dispose
    @come_window.dispose
  end
 
  # update method:
 
  def update
   
    @come_window.update
   
    @upper_window.update("Choose an action:")
   
    if Input.trigger?(Input::B)
      $game_system.se_play($data_system.cancel_se)
      $scene = Scene_Map.new
    end
   
    if Input.trigger?(Input::X)
      $game_system.se_play($data_system.cancel_se)
      $scene = Scene_Map.new
    end
   
    if Input.trigger?(Input::C) # if enter is pressed
      case @come_window.index #the index for window is the position of the cursor
        when 0 #starts at 0 because it's an array
          $scene = Scene_Map.new
          $game_switches[23] = true
         
        when 1
          $scene = Scene_Map.new
          $game_switches[23] = false

      end
       
      end
    end
   
 
end #of the scene

   
   
#===================================================
#   Window_Diaryhelp (Upper Window)
#===================================================
class Window_Comehelp < Window_Base 
   
  def initialize
    super(160, 0, 320, 64)
    self.contents = Bitmap.new(width-32, height-32)
    self.contents.font.name = "Arial" 
    self.contents.font.size = 20
  end

  def update(help_text) #Receive argument, show relevant help text in window
    self.contents.clear #Clear the content before displaying new data !
    self.contents.draw_text(0, 0, 180, 32, help_text) #show the content of "help_text" variable
  end

end

#===================================================
#    Window_Diaryhelp ends
#===================================================

def disable_item(index)
@disabled[index] = true
end


What I got here basically is disabling the caterpillar depending on the selected command.

What I need is that when I select 'Come over here', the event following me(the other party member, which will be only one) takes the exactsame steps I took and not walk a straight line or be teleported to my location. For example, when I first select 'Stay there' the event stops following me, and even if i walk in circles around trees in the map and end up on the other side, if I select 'Come over here' I want him to follow the exact same footsteps, including walking in circles.

I wonder if someone'll help me! 

Thanks in advance!