[RGSS] Falcon's Tax Script

#============================================================================
# Tax Script 2.0
#----------------------------------------------------------------------------
# By Falcon
# Thanks to Blizzard for the idea that triggered version 2.0
#----------------------------------------------------------------------------
# This system should be compatible with all shop systems, but the
# Shop Status window will only show the tax/discount rate for the default
#============================================================================

# setup the variable that will hold the tax rate
class Game_System
  attr_accessor :tax
  alias init_tax initialize
  def initialize
    init_tax
    @tax = 0
  end
end

# increase the price of the following items by the tax rate
module RPG
  class Item
    alias price_tax price
    def price() (price_tax + price_tax*($game_system.tax || 0) / 100).to_i end
  end

  class Weapon
    alias price_tax price
    def price() (price_tax + price_tax*($game_system.tax || 0) / 100).to_i end
  end

  class Armor
    alias price_tax price
    def price() (price_tax + price_tax*($game_system.tax || 0) / 100).to_i end
  end
end

class Window_ShopStatus < Window_Base
  #--------------------------------------------------------------------------
  # * Refresh
  #--------------------------------------------------------------------------
  def refresh
    self.contents.clear
    return if @item == nil
    case @item
    when RPG::Item
      number = $game_party.item_number(@item.id)
    when RPG::Weapon
      number = $game_party.weapon_number(@item.id)
    when RPG::Armor
      number = $game_party.armor_number(@item.id)
    end
    self.contents.font.color = system_color
    self.contents.draw_text(4, 0, 200, 32, "Number in Possession")
    self.contents.font.color = normal_color
    self.contents.draw_text(204, 0, 32, 32, number.to_s, 2)
    self.contents.font.color = system_color
    # If there is tax, then let the player know about it
    tax = $game_system.tax || 0
    if tax > 0 # If there is tax
      self.contents.draw_text(4, 0, 200, 86, "Current Tax Rate")
      self.contents.font.color = normal_color
      self.contents.draw_text(132, 0, 104, 86, tax.to_s + "%", 2)
    elsif tax < 0 # If there is a discount rate
      self.contents.draw_text(4, 0, 200, 86, "Discount Rate")
      self.contents.font.color = normal_color
      self.contents.draw_text(122, 0, 124, 86, tax.to_s + "%", 2)
    end
    return if @item.is_a?(RPG::Item)
    # Equipment adding information
    for i in 0...$game_party.actors.size
      # Get actor
      actor = $game_party.actors[i]
      # If equippable, then set to normal text color. If not, set to
      # invalid text color.
      if actor.equippable?(@item)
        self.contents.font.color = normal_color
      else
        self.contents.font.color = disabled_color
      end
      # Draw actor's name
      self.contents.draw_text(4, 64 + 64 * i, 120, 32, actor.name)
      # Get current equipment
      if @item.is_a?(RPG::Weapon)
        item1 = $data_weapons[actor.weapon_id]
      elsif @item.kind == 0
        item1 = $data_armors[actor.armor1_id]
      elsif @item.kind == 1
        item1 = $data_armors[actor.armor2_id]
      elsif @item.kind == 2
        item1 = $data_armors[actor.armor3_id]
      else
        item1 = $data_armors[actor.armor4_id]
      end
      # If equippable
      if actor.equippable?(@item)
        # If weapon
        if @item.is_a?(RPG::Weapon)
          atk1 = item1 != nil ? item1.atk : 0
          atk2 = @item != nil ? @item.atk : 0
          change = atk2 - atk1
        end
        # If armor
        if @item.is_a?(RPG::Armor)
          pdef1 = item1 != nil ? item1.pdef : 0
          mdef1 = item1 != nil ? item1.mdef : 0
          pdef2 = @item != nil ? @item.pdef : 0
          mdef2 = @item != nil ? @item.mdef : 0
          change = pdef2 - pdef1 + mdef2 - mdef1
        end
        # Draw parameter change values
        self.contents.draw_text(124, 64 + 64 * i, 112, 32,
          sprintf("%+d", change), 2)
      end
      # Draw item
      if item1 != nil
        x = 4
        y = 64 + 64 * i + 32
        bitmap = RPG::Cache.icon(item1.icon_name)
        opacity = self.contents.font.color == normal_color ? 255 : 128
        self.contents.blt(x, y + 4, bitmap, Rect.new(0, 0, 24, 24), opacity)
        self.contents.draw_text(x + 28, y, 212, 32, item1.name)
      end
    end
  end
end