Dark's Pre-Skill Image

#===============================================================================
# ╔══════════════════════════════════╗
# ║ ▼ Dark's Pre-Skill Image         ║
# ║ ▼ Author: Nhat Nguyen (Dark Sky) ║
# ║ ▼ Release Date: March 5th 2016   ║
# ╚══════════════════════════════════╝
# ▼ Notetag: <pre_image: "ImageName">
#  -> Ex: <pre_image: "Skill1"> : Where Skill1 is name of a picture in
#                                 Graphics/Picture
#  To edit the image show time please check line 14.
#===============================================================================
$imported = {} if $imported.nil?
$imported["DRK-Pre-Skill_Image"] = true

module DarkPreSkill
  Delay = 100
  SE_Name = "Skill3"
  REGEXP = /<pre[_*]image:\s*"(\w+)">/i
end

class RPG::Skill < RPG::UsableItem
  #--------------------------------------------------------------------------
  # * Load Notetag for Pre Image
  #--------------------------------------------------------------------------
  def load_pre_image
    @pre_image = nil
    note.split(/[\r\n]+/).each do |line|
      if line =~ DarkPreSkill::REGEXP
        @pre_image = $1.to_s
      end
    end
  end
  attr_accessor :pre_image
end
class Game_Actor < Game_Battler
  #--------------------------------------------------------------------------
  # * Initialize
  #--------------------------------------------------------------------------
  alias :dark_pre_skill_init_game_actor :initialize
  def initialize(actor_id)
    dark_pre_skill_init_game_actor(actor_id)
    $data_skills.each do |skill|
      if skill
        skill.load_pre_image
      end
    end
  end
end
class Scene_Battle < Scene_Base
  #--------------------------------------------------------------------------
  # * start
  #--------------------------------------------------------------------------
  alias :dark_pre_skill_start :start
  def start
    dark_pre_skill_start
    @pre_wait = 0
    @used_skill = false
    @pre_skill_sprite = Sprite.new
    @pre_skill_sprite.opacity = 0
    @pre_image = ""
    @play_pre_skill = false
  end
  #--------------------------------------------------------------------------
  # * Update Pre Skill
  #--------------------------------------------------------------------------
  def update_pre_skill
    if @pre_wait > (DarkPreSkill::Delay/2) && @play_pre_skill == true
      @pre_skill_sprite.bitmap = Cache.picture(@pre_image)
      @pre_skill_sprite.viewport = @viewport
      @pre_skill_sprite.z = 999
      @pre_skill_sprite.visible = true
      @pre_skill_sprite.opacity += 10
    else
      if @pre_wait > 0
        @pre_skill_sprite.opacity -= 5
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Frame Update
  #--------------------------------------------------------------------------
  def update
    super
    update_pre_skill
    if @pre_wait > 0 && @used_skill == true
      @pre_wait -= 1
    end
    if BattleManager.in_turn? && @used_skill == false && @pre_wait <= 0
        process_event
        process_action
    end
    if @used_skill == true && @pre_wait <= 0
      @pre_skill_sprite.visible = false
      execute_action
      @subject.remove_current_action
      process_action_end unless @subject.current_action
      @used_skill = false
      @play_pre_skill = false
    end
    BattleManager.judge_win_loss if @used_skill != true
  end
  #--------------------------------------------------------------------------
  # * Battle Action Processing
  #--------------------------------------------------------------------------
  def process_action
    return if scene_changing?
    if !@subject || !@subject.current_action
      @subject = BattleManager.next_subject
    end
    return turn_end unless @subject
    if @subject.current_action
      @subject.current_action.prepare
      if @subject.current_action.valid?
        @status_window.open
        item = @subject.current_action.item
        if @subject.current_action.subject.is_a?(Game_Actor)
          if item.is_a?(RPG::Skill)
            if item.pre_image
              @pre_wait = DarkPreSkill::Delay
              @play_pre_skill = true
              @pre_image = item.pre_image
              Audio.se_play("Audio//SE//#{DarkPreSkill::SE_Name}")
            else
              @play_pre_skill = false
              @pre_wait = 0
            end
          end
        end
        @used_skill = true
      end
    end
  end
end