Item Price Adjust

Item Price Adjust
Version: 1.0
Author: JFace
Date: June 19, 2010

Description

This script allows the user to adjust the cost and sale price of items during gameplay. This is particularly useful if using a Haggle type of event wherein the hero can pay less than asking price, and receive more money from sales. The cost and sale adjustments are customizable.

Screenshots

Items at full cost


The same items at half cost


The sale price set at 80%, instead of the default 50%

Instructions

Follow the instructions at the top of the script. 
 
 

Script

Code: [Select]

#===============================================================================
#
# Item Price Adjust - By JFace
# July 19, 2010
# 
# This script adjusts the cost and sale price of items in game. This is
# particularly useful if using a Haggle type of event wherein the hero can
# pay less than asking price, and receive more money from sales. The cost
# and sale adjustments are customizable.
#
#
#
# Instructions
# -----------------------------------------------------------------------------
# To use this script, place this script anywhere below ? Materials
# but above ? Main. Save your game.
#
# There are four customizable features below. Read the comments.
# ==============================================================================

module JFace
  module Discount
 
#===============================================================================
# Switch Initialization - Set up which switch ID you wish to use. This switch
# controls whether to use the standard item cost (when the switch is [OFF],
# or to use the adjusted item cost (when the switch is [ON].
#
  CostSwitch = 3    # <-- This is a switch ID number
#===============================================================================   
 
#===============================================================================
# Cost Adjust Variable - Set up which variable ID you wish to use. This variable
# controls the percent of adjustment to the standard item cost. For instance,
# when the variable value is set to 80, items will cost 80% of standard value.
# The switch associated to CostSwitch must be on for this value to take effect.
# 
  CostAdjust = 21   # <-- This is a variable ID number
#=============================================================================== 

#===============================================================================
# Sale Adjust Variable - Set up which variable ID you wish to use. This variable
# controls the percent of adjustment to the standard item sale. For instance,
# when the variable value is set to 50, items will sell for 50% of standard
# value. This value will always be in effect, regardless of CostSwitch.
#
  SaleAdjust = 22   # <-- This is a variable ID number
#===============================================================================

#===============================================================================
# Local Switch Initialization - This should generally be kept false.
# false => the CostAdjust variable will not affect the sale price
# true  => the CostAdjust variable will affect the sale price
#
  DiscountSale = false  # <== Must be true or false
#=============================================================================== 

#===============================================================================
# This concludes the customizable section of this script
#===============================================================================
  end
end

  #--------------------------------------------------------------------------
  # * Draw Item
  #     index : item number
  #--------------------------------------------------------------------------
  def draw_item(index)
    item = @data[index]
    number = $game_party.item_number(item)
    if $game_switches[JFace::Discount::CostSwitch] == true
      price = item.price*$game_variables[JFace::Discount::CostAdjust]
      price = price/100
      enabled = (price <= $game_party.gold and number < 99)
      rect = item_rect(index)
      self.contents.clear_rect(rect)
      draw_item_name(item, rect.x, rect.y, enabled)
      rect.width -= 4
      self.contents.draw_text(rect, price, 2)
    else
      enabled = (item.price <= $game_party.gold and number < 99)
      rect = item_rect(index)
      self.contents.clear_rect(rect)
      draw_item_name(item, rect.x, rect.y, enabled)
      rect.width -= 4
      self.contents.draw_text(rect, item.price, 2)
    end
  end


#==============================================================================
# ** Scene_Shop
#------------------------------------------------------------------------------
#  This class performs shop screen processing.
#==============================================================================

class Scene_Shop < Scene_Base
 
 
 
  #--------------------------------------------------------------------------
  # * Update Buy Item Selection
  #--------------------------------------------------------------------------
  def update_buy_selection
    @status_window.item = @buy_window.item
    if Input.trigger?(Input::B)
      Sound.play_cancel
      @command_window.active = true
      @dummy_window.visible = true
      @buy_window.active = false
      @buy_window.visible = false
      @status_window.visible = false
      @status_window.item = nil
      @help_window.set_text("")
      return
    end
    if Input.trigger?(Input::C)
      @item = @buy_window.item
      number = $game_party.item_number(@item)
      if $game_switches[JFace::Discount::CostSwitch]
        price = @item.price*$game_variables[JFace::Discount::CostAdjust]
        price = price/100
        if @item == nil or price > $game_party.gold or number == 99
          Sound.play_buzzer
        else
          Sound.play_decision
          max = @item.price == 0 ? 99 : $game_party.gold / @item.price
          max = [max, 99 - number].min
          @buy_window.active = false
          @buy_window.visible = false
          price = @item.price*$game_variables[JFace::Discount::CostAdjust]
          price = price/100
          @number_window.set(@item, max, price)
          @number_window.active = true
          @number_window.visible = true
        end
      else
        if @item == nil or @item.price > $game_party.gold or number == 99
          Sound.play_buzzer
        else
          Sound.play_decision
          max = @item.price == 0 ? 99 : $game_party.gold / @item.price
          max = [max, 99 - number].min
          @buy_window.active = false
          @buy_window.visible = false
          @number_window.set(@item, max, @item.price)
          @number_window.active = true
          @number_window.visible = true
        end
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Update Sell Item Selection
  #--------------------------------------------------------------------------
  def update_sell_selection
    if Input.trigger?(Input::B)
      Sound.play_cancel
      @command_window.active = true
      @dummy_window.visible = true
      @sell_window.active = false
      @sell_window.visible = false
      @status_window.item = nil
      @help_window.set_text("")
    elsif Input.trigger?(Input::C)
      @item = @sell_window.item
      @status_window.item = @item
      if @item == nil or @item.price == 0
        Sound.play_buzzer
      else
        Sound.play_decision
        max = $game_party.item_number(@item)
        @sell_window.active = false
        @sell_window.visible = false
        depreciation = @item.price*$game_variables[JFace::Discount::SaleAdjust]
        depreciation = depreciation/100
        if JFace::Discount::DiscountSale == true
          price = @item.price*$game_variables[JFace::Discount::CostAdjust]
          price = price/100         
          @number_window.set(@item, max, depreciation)
        else
          @number_window.set(@item, max, depreciation)
        end
        @number_window.active = true
        @number_window.visible = true
        @status_window.visible = true
      end
    end
  end


  #--------------------------------------------------------------------------
  # * Confirm Number Input
  #--------------------------------------------------------------------------
  def decide_number_input
    Sound.play_shop
    @number_window.active = false
    @number_window.visible = false
    case @command_window.index
    when 0  # Buy
      if $game_switches[JFace::Discount::CostSwitch]
        price = @item.price*$game_variables[JFace::Discount::CostAdjust]
        price = price/100
        $game_party.lose_gold(@number_window.number * price)
      else
        $game_party.lose_gold(@number_window.number * @item.price)
      end
      $game_party.gain_item(@item, @number_window.number)
      @gold_window.refresh
      @buy_window.refresh
      @status_window.refresh
      @buy_window.active = true
      @buy_window.visible = true
    when 1  # sell
      depreciation = @item.price*$game_variables[JFace::Discount::SaleAdjust]
      depreciation = depreciation/100
      if JFace::Discount::DiscountSale == true
        price = @item.price*$game_variables[JFace::Discount::CostAdjust]
        price = price/100       
        $game_party.gain_gold(@number_window.number * depreciation)
      else
        $game_party.gain_gold(@number_window.number * depreciation)
      end
      $game_party.lose_item(@item, @number_window.number)
      @gold_window.refresh
      @sell_window.refresh
      @status_window.refresh
      @sell_window.active = true
      @sell_window.visible = true
      @status_window.visible = false
    end
  end
end


Another great idea. Again, however, you don't need to reproduce every method of a class. Only overwrite the methods that you need to and the other ones are retained from the original definition.

The only other thing I will mention is that it might be more efficient to look into modifying the price methods of RPG::Item, RPG::Weapon, and RPG::Armor, rather than overwriting methods of Scene_Shop. That way, this script would work with other scripts that change Scene_Shop or make different ways of buying and selling items.

The last thing I will say is that you don't seem to be aliasing, even where it would be beneficial. I recommend you take a look at my tutorial on the subject: Aliasing in RGSS/2. It's not great, and it's a little incomplete, but it should be enough to get you started.

Another great idea. Again, however, you don't need to reproduce every method of a class. Only overwrite the methods that you need to and the other ones are retained from the original definition.

The only other thing I will mention is that it might be more efficient to look into modifying the price methods of RPG::Item, RPG::Weapon, and RPG::Armor, rather than overwriting methods of Scene_Shop. That way, this script would work with other scripts that change Scene_Shop or make different ways of buying and selling items.

The last thing I will say is that you don't seem to be aliasing, even where it would be beneficial. I recommend you take a look at my tutorial on the subject: Aliasing in RGSS/2. It's not great, and it's a little incomplete, but it should be enough to get you started.

Thanks for the advice. I'm definitely still learning, and I'll look into those changes. I thought I would contribute this to rmrk.net in the interim so that I am not just leaching off the site.

More to come!

That is a nice idea. Good job, JFace!