[VXA Script] matching seqential filenames

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Code:
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  # * Show Picture

  #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  alias mafpm_showpic_3jb7 show

  def show(name, *args, &block)

    # Only fix pictures if in Scene_Map

    if SceneManager.scene_is?(Scene_Map)

      @mafpm_fixed = (MA_FixPicture::SWITCH_ID == true ||

        $game_switches[MA_FixPicture::SWITCH_ID] || !name[/\[FIXED\]/i].nil?)

      z_var = $game_variables[MA_FixPicture::Z_VARIABLE_ID]

      # If 0 or less than 300, then it should belong to the viewport1

      @mafpm_vp_id = z_var < 300 ? 1 : 2

      @mafpm_z = z_var

    end

    mafpm_showpic_3jb7(name, *args, &block) # Call Original Method

    if @mafpm_fixed && (MA_FixPicture::COORDINATES_SWITCH_ID == true || $game_switches[MA_FixPicture::COORDINATES_SWITCH_ID])

      @x *= 32

      @y *= 32

    end

  #if shown picture name contains [ANI][frame index] & [display length]..

    if @name[/(\w+)(\[ANI\])\[(\d+)\]\[(\d+)\]/i] # to create (local $variables)

      base_name = $1

      @mafpm_ani_duration = $4.to_i     # $4 is the "frame duration" regexp match

      @on_screen = @mafpm_ani_duration  # @on_screen is a disposable copy of $4

      @mafpm_frame_index = 0  # to mark current possition in "Dir.entries[]"

      @mafpm_ani_frames = Dir.entries(

      "Graphics/Pictures").select{

      |e| e =~ /#{Regexp.quote(base_name)}(\[ANI\])\[(\d+)\]\[(\d+)\]/i}

      @mafpm_animated = true # trigger update to animate

    end

  end

  #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  # * Update Picture

  #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  alias trpls_gp_update_als         update

  def update

    trpls_gp_update_als

    update_animation if @mafpm_animated # <-- the trigger from "def show"

  end

  #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  # * Animate Picture if [ANI] appended to picture filename

  #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  def update_animation

    @on_screen -= 1       #reduce time to display current frame

    if @on_screen == 0

      if @mafpm_frame_index != (@mafpm_ani_frames.size - 1)

        @mafpm_frame_index += 1

        @name = @mafpm_ani_frames[@mafpm_frame_index]

        @name[/(\w+)(\[ANI\])\[(\d+)\]\[(\d+)\]/i] # to create (local $variables)

        @on_screen = $4.to_i

      else #(if there is no more frames in @mafpm_ani_frames array)

        @mafpm_frame_index = 0 # return to original frame(picture)

        @name = @mafpm_ani_frames[0]

        @on_screen = @mafpm_ani_duration # <-- original frame duration

      end

    end

  end