Using items Options

[Noob_king]

How can I make certain objects respond only to certain items after you've selected them from the menu. For example, when you get a key all you have to do is walk towards the door and it will automatically open. How can I make it so you have to actually select the item from the menu before you can open the door. And have it so the key item will not do anything when you use it at any other time? Not only for keys but for items as well. Maybe certain npcs react differently when you go near them and select a certain item. I know how to do this by creating an event that turns on a switch that makes the item pull up a common event etc.... but then I have to make a new event to turn off the switch so the item doesnt do it all the time. I know there has to be an easier way. Thanks you in advance,

[Night_Runner]

That sounds fun

CODE

#==============================================================================
# ** VXAce: NR's Using Items
#------------------------------------------------------------------------------
# History:
#  Date Created: 21 May 2012
#  Created for: Noob_king
#   @> http://www.rpgrevolution.com/forums/index.php?showtopic=56447
#
# Description:
#  This script lets you click on an item from the pause menu, and use it on a
#  pre-configured event.
#
# How to Intsall:
#  Copy this entire script. In your game's editor, along the Menu Bar, click
#  Tools >> Script Editor.
#  Along the left, scroll down to Materials, right click underneath it, and
#  select 'Insert'
#  Paste the code on the right.
#
# How to Use:
#  Have a event with a comment command that reads like so:
#              <UseItem:1,SS:A>
#  where 1 is the ID of the item (ID is found next to the name of the item in
#  the Database) you need to use to activate the event, and A is the
#  self-switch to activate when the item is used.
#==============================================================================



#==============================================================================
# ** Customisation
#==============================================================================

module NR_UsingItems
  Format = /\<UseItem\:(\d+),SS\:([a-zA-Z])\>/
end



#==============================================================================
# ** Scene_Item
#------------------------------------------------------------------------------
#  This class performs the item screen processing.
#==============================================================================

class Scene_Item
  #--------------------------------------------------------------------------
  # * Alias Methods
  #--------------------------------------------------------------------------
  alias nr_useItem_start       start       unless $@
  alias nr_useItem_on_item_ok  on_item_ok  unless $@
  #--------------------------------------------------------------------------
  # * Start Processing
  #--------------------------------------------------------------------------
  def start(*args)
    # Create an array of items usable on the map
    @items_usable_on_map = []
    # Get the spot in front of the player
    player = $game_player
    x2 = $game_map.round_x_with_direction(player.x, player.direction)
    y2 = $game_map.round_y_with_direction(player.y, player.direction)
    # Loop through looking for an event, either under the player or in front
    positions = [ [player.x, player.y], [x2, y2] ]
    events = []
    for xy in positions
      $game_map.events_xy(xy[0], xy[1]).each do |event|
        events << event
      end
    end
    # If an event exists
    if not events.nil?
      # Loop through them
      for event in events
        # Loop through the event's commands
        for command in event.list.to_a
          # If there's a comment
          if command.code == 108
            # If the comment is the correct format
            item = command.parameters[0].scan(NR_UsingItems::Format)[0]
            if not item.nil?
              # List this item as the usable on an event
              item << event
              add_to_items_usable_on_map(item)
            end
          end
        end
      end
    end
    # Run the original start
    return nr_useItem_start(*args)
  end
  #--------------------------------------------------------------------------
  # * Add to items usable on the map
  #--------------------------------------------------------------------------
  def add_to_items_usable_on_map(item)
    @items_usable_on_map << {:item_id => item[0].to_i,
                             :self_switch => item[1],
                             :event_id => item[2].id
                            }
  end
  #--------------------------------------------------------------------------
  # * Item [OK]
  #--------------------------------------------------------------------------
  def on_item_ok(*args)
    # Loop through each item usable
    for map_item in @items_usable_on_map
      # If the usable on map item is selected
      if item.id == map_item[:item_id]
        event_id = map_item[:event_id]
        key = [$game_map.map_id, event_id, map_item[:self_switch]]
        $game_self_switches[key] = true
        $game_map.need_refresh = true
        SceneManager.goto(Scene_Map)
        return
      end
    end
    # If the item is used normally, process normally
    return nr_useItem_on_item_ok(*args)
  end
end



#==============================================================================
# ** End of Script.
#==============================================================================

This script works by activating a self-switch of the event underneath/in front of the player, if the event is configured to accept it, so for example:

[Show/Hide] See inside

See how there's a comment, is says that this event needs a potion (the item ID 1 corresponds to the first item in the database), and if it is given the potion then it will activate the event's self switch A


And yeah, since Self Switch A is the condition along the left to show this page, it runs...

http://i.1dl.us/u8t.png
I ran out of motivation to write an epic NPC, so I'll let you continue it

And that works by going in to the Items screen, and selecting the potion

[Noob_king]

NICE!!! Thats exactly what I was looking for. But why isnt this option already included in the game? Seems like a no-brainer.

Please don't quote entire posts, see the warning in the other post - Night_Runner

This post has been edited by Night_Runner: May 31 2012, 04:39 AM

[Night_Runner]

Pleasure my friend

The thing to always remember about Enterbain is that they always implement what they see as the most new-user friendly option, I assume that they saw implementing a system like this could be confusing to new users, and so they left it to scripters to create.

I've removed the accidental posts, make it a bit easier for people to read what's happening.