Dark's Footstep Effect

#===============================================================================
# Name: Dark's Advanced Footstep Effect
# Author: Nhat Nguyen (Dark Sky)
# Released on: May 24th 2016
#-------------------------------------------------------------------------------
# Version 1.0: Released!
#-------------------------------------------------------------------------------
# How to use:
# Line 21: TERRAIN_TAGS[x] = "se"
#          x : terrain tag bạn set cho tile trong tileset.
#          se: tên file SE khi nhân vật di chuyển.
#===============================================================================
module DarkSky
  module DarkStepEffect
    FOOTSTEP_DELAY = 15 #Find it out yourself!
    DISABLE_FOOTPRINT_SWITCH = 15
    DISABLE_FOOTSOUND_SWITCH = 16
    DEFAULT_FOOT_SE = "footstep" #Replace SE when Terrain tag's SE is not found.
    #---------------------------------------------------------------------------
    # Footstep SE // Editable
    #---------------------------------------------------------------------------
    TERRAIN_TAGS = {}
    TERRAIN_TAGS[2] = "footstep"
    TERRAIN_TAGS[3] = "Movea"
  end
end
include DarkSky::DarkStepEffect
class Spriteset_Map
  # <Aliasing Method>
  alias_methods = ["initialize","update","dispose"]
  alias_methods.each do |method|
    eval("alias dark_footstep_effect_#{method} #{method}")
  end
  # </Aliasing Method>
  #-----------------------------------------------------------------------------
  # * Initialize
  #-----------------------------------------------------------------------------
  def initialize
    @footprints_sprites = []
    @footdelay = FOOTSTEP_DELAY
    dark_footstep_effect_initialize
  end
  #-----------------------------------------------------------------------------
  # * Update
  #-----------------------------------------------------------------------------
  def update
    dark_footstep_effect_update
    $game_map.events.values.each do |event|
      break if $game_switches[DISABLE_FOOTPRINT_SWITCH] && $game_switches[DISABLE_FOOTSOUND_SWITCH]
      if event.footprint == true
        if event.moving?
          if event.footdelay == 0
            distance = event.distance_x_from($game_player.x) + event.distance_y_from($game_player.y)
            distance = 20 - distance.abs.to_f
            distance /= 20
            if !$game_switches[DISABLE_FOOTSOUND_SWITCH]
              begin
                RPG::SE.new("#{TERRAIN_TAGS[event.footterrain]}",100*distance.abs).play
              rescue
                RPG::SE.new(DEFAULT_FOOT_SE,100*distance.abs).play
              end
            end
            if !$game_switches[DISABLE_FOOTPRINT_SWITCH]
              @footprints_sprites.push(Sprite_Footprints.new(event.real_x*32,event.real_y*32,@viewport1,event))
            end
            event.footdelay = FOOTSTEP_DELAY
          else
            event.footdelay -= 1
          end
        else
          event.footdelay = 0
        end
      end
    end
    if TERRAIN_TAGS.has_key?($game_map.terrain_tag($game_player.real_x,$game_player.real_y))
      if $game_player.moving?
        if @footdelay == 0
          if !$game_switches[DISABLE_FOOTSOUND_SWITCH]
            begin
              RPG::SE.new("#{TERRAIN_TAGS[$game_map.terrain_tag($game_player.real_x,$game_player.real_y)]}",100).play
            rescue
              RPG::SE.new(DEFAULT_FOOT_SE,100).play
            end
          end
          if !$game_switches[DISABLE_FOOTPRINT_SWITCH]
            @footprints_sprites.push(Sprite_Footprints.new($game_player.real_x*32,$game_player.real_y*32,@viewport1,$game_player))
          end
          @footdelay = FOOTSTEP_DELAY
        else
          @footdelay -= 1
        end
      else
        @footdelay = 0
      end
    end
    @footprints_sprites.each do |sprite|
      sprite.update
    end
  end
  #-----------------------------------------------------------------------------
  # * Dispose
  #-----------------------------------------------------------------------------
  def dispose
    dark_footstep_effect_dispose
  end
end

#==============================================================================
# ** Game_Event
#------------------------------------------------------------------------------
#  This class handles events. Functions include event page switching via
# condition determinants and running parallel process events. Used within the
# Game_Map class.
#==============================================================================
include DarkSky::DarkStepEffect
class Game_Event < Game_Character
  # <Aliasing Method>
  alias dark_foot_effect_event_init initialize
  alias dark_foot_effect_event_update update
  # </Aliasing Method>
  attr_reader :footprint
  attr_accessor :footdelay
  attr_reader :footterrain
  #--------------------------------------------------------------------------
  # * Object Initialization
  #     event:  RPG::Event
  #--------------------------------------------------------------------------
  def initialize(map_id, event)
    dark_foot_effect_event_init(map_id, event)
    @footprint = false
    @footterrain = nil
    @footdelay = FOOTSTEP_DELAY
  end
  #--------------------------------------------------------------------------
  # * Frame Update
  #--------------------------------------------------------------------------
  def update
    dark_foot_effect_event_update
    if TERRAIN_TAGS.has_key?($game_map.terrain_tag(self.real_x,self.real_y))
      @footprint = true
      @footterrain = $game_map.terrain_tag(self.real_x,self.real_y)
    else
      @footprint = false
      @footterrain = nil
    end
  end
end

class Sprite_Footprints < Sprite
  def initialize(x,y,viewport,character)
    super(viewport)
    @character = character
    self.bitmap = Cache.character("$Footprints")
    self.x = x
    self.y = y
    self.z = 999
    @ch = @cw = 32
    update_src_rect
  end
  def update
    super
    if self.opacity > 0
      self.opacity -= 3
    end
    update_fixed
  end
  def update_fixed
    self.ox = $game_map.display_x*32
    self.oy = $game_map.display_y*32
  end
  def dispose
    super
  end
  def update_src_rect
    index = @character.character_index
    pattern = @character.pattern < 3 ? @character.pattern : 1
    sx = (index % 4 * 3 + pattern) * @cw
    sy = (index / 4 * 4 + (@character.direction - 2) / 2) * @ch
    self.src_rect.set(sx, sy, @cw, @ch)
  end
end