#==============================================================================
# ** VXAce: Animated Enemy Battlers
#------------------------------------------------------------------------------
# History:
#  Date Created: 13/Apr/2012
#  Created for: TheCretanHound
#   @> http://www.rpgrevolution.com/forums/index.php?showtopic=56171
#
# Description:
#  This script is designed to animate the enemy battlers in the default
#   RMVX Ace battle system.
#
# How to Install:
#  Copy this entire script. In your game editor select Tools >> Script Editor.
#   Along the left, scroll down to the bottom, right click on 'Main', and
#   select 'Insert'. Paste the code on the right.
#
# How to Use:
#  Please see below for the default number of frames per step, and the
#   default number of steps per graphic.
#  To set the number of frames per step and the number of steps per graphic
#   for an individual battler, change their name to:
#      Slime[100, 2].png
#   Where Slime is their normal name, 100 is the number of frames to wait
#   per animation, and 2 is the number of frames per graphic.
#==============================================================================



#==============================================================================
# ** Customisation
#==============================================================================

module NR_AnimEnemies
  DEFAULT_FRAMES = 20
  DEFAULT_STEPS = 4
end



#==============================================================================
# ** Sprite_Battler
#------------------------------------------------------------------------------
#  Edited to have animated battlers.
#==============================================================================

class Sprite_Battler
  #--------------------------------------------------------------------------
  # * Alias Methods
  #--------------------------------------------------------------------------
  alias nr_animEnemy_update_bitmap  update_bitmap  unless $@
  #--------------------------------------------------------------------------
  # * Update Transfer Origin Bitmap
  #--------------------------------------------------------------------------
  def update_bitmap(*args)
    # Restore the bitmap to the whole bitmap (if it exists)
    self.bitmap = @whole_bitmap unless @last_bitmap.nil?
    # Run the original update_bitmap
    nr_animEnemy_update_bitmap(*args)
    # Return if appropriate
    return if self.bitmap.nil?
    return if @battler.is_a? Game_Actor
    # If the bitmap name has changed
    if @old_bitmap_name != @battler.battler_name or
        @old_battler_hue != @battler.battler_hue
      # Backup their name & hue
      @old_bitmap_name = @battler.battler_name
      @old_battler_hue = @battler.battler_hue
      # Get the note for this enemy
      notebox = $data_enemies[@battler.enemy_id].note.to_s
      # Read the number of frames
      frames = @battler.battler_name.match( /\[(.*)\]$/ )
      if frames.nil?
        @animation_frames = NR_AnimEnemies::DEFAULT_FRAMES
        @animation_steps = NR_AnimEnemies::DEFAULT_STEPS
      else
        @animation_frames, @animation_steps = eval(frames[0])
      end
      # Reset the frames_since_anim
      @frames_since_anim = -1
      @current_anim_index = -1
      # Backup the un-segmented battler
      @whole_bitmap = self.bitmap.clone
    # If the battler hasn't changed
    else
      # Restore the bitmap to the segmented battler
      self.bitmap = @segmented_bitmap
    end
    # If it's time for an update
    if @frames_since_anim == -1 or @frames_since_anim > @animation_frames
      # Update the current anim index
      @current_anim_index = (@current_anim_index + 1) % @animation_steps
      # Reset the update counter
      @frames_since_anim = 0
      # Get the dimensions of the whole bitmap
      r = Rect.new(0, 0, @whole_bitmap.width, @whole_bitmap.height)
      # Create a rect to get the segmented battler
      x = @current_anim_index * r.width / @animation_steps
      source_x = Rect.new(x, r.y, r.width, r.height)
      # Create the bitmap with the segmented battler and set it as active
      a_bitmap = Bitmap.new(r.width / @animation_steps, r.height)
      a_bitmap.blt(0, 0, @whole_bitmap, source_x)
      self.bitmap = a_bitmap
      @segmented_bitmap = self.bitmap.clone
    end
    # Increment the frames since an animation
    @frames_since_anim += 1
  end
end



#==============================================================================
# ** End of Script.
#==============================================================================