Autoscrolling Panoramas

[RPG Advocate]

Autoscrolling Panoramas
by RPG Advocate
saved from Phylomortis.Com

Introduction
This script adds support for scrolling panoramas. The panorama can be scrolled simultaneously in both the horizontal and vertical directions and works for panoramas of any size. To set a panorama to autoscroll, use the "Script" event command to change the variables "$game_system.autoscroll_x_speed" and "$game_system.autoscroll_y_speed".

Each frame, the panorama will scroll one pixel for each eight speed units. For example, if you want the panorama to scroll one pixel every four frames, use a speed value of 2. For the horizontal and vertical directions, positive speeds scroll the panorama to the right and up, respectively, while negative speeds scroll left and down. Please be aware that the scrolling attributes are retained when changing maps, so set both speeds to 0 before switching maps if you don't want the new panorama to scroll.


Demo
>Click<


Script

Autoscrolling Panoramas

Code:

# Autoscrolling Panoramas
# by RPG Advocate


#==============================================================================
# ** Game_System
#------------------------------------------------------------------------------
#  This class handles data surrounding the system. Backround music, etc.
#  is managed here as well. Refer to "$game_system" for the instance of
#  this class.
#==============================================================================

class Game_System
  #--------------------------------------------------------------------------
  # * Public Instance Variables
  #--------------------------------------------------------------------------
  attr_accessor :autoscroll_x_speed       # panorama horizontal speed
  attr_accessor :autoscroll_y_speed       # panorama vertical speed
  #--------------------------------------------------------------------------
  # * Object Initialization
  #--------------------------------------------------------------------------
  alias autopan_initialize initialize
  def initialize
    autopan_initialize
    @autoscroll_x_speed = 0
    @autoscroll_y_speed = 0
  end
end



#==============================================================================
# ** Spriteset_Map
#------------------------------------------------------------------------------
#  This class brings together map screen sprites, tilemaps, etc.
#  It's used within the Scene_Map class.
#==============================================================================

class Spriteset_Map
  #--------------------------------------------------------------------------
  # * Object Initialization
  #--------------------------------------------------------------------------
  alias autopan_initialize initialize
  def initialize
    @scroll_point_x   = 0
    @scroll_point_y   = 0
    @scroll_frames_x  = 0
    @scroll_frames_y  = 0
    @scroll_speed_x   = $game_system.autoscroll_x_speed
    @scroll_speed_y   = $game_system.autoscroll_y_speed
    # The original call
    autopan_initialize
  end
  #--------------------------------------------------------------------------
  # * Frame Update
  #--------------------------------------------------------------------------
  alias autopan_update update
  def update
    # Apply new scroll speed from $game_system
    if $game_system.autoscroll_x_speed != @scroll_speed_x
      @scroll_speed_x = $game_system.autoscroll_x_speed
    end
    if $game_system.autoscroll_y_speed != @scroll_speed_y
      @scroll_speed_y = $game_system.autoscroll_y_speed
    end
    # The original call
    autopan_update
    # Perform panorama scrolling
    scroll
    # Update panorama plane    
    if $game_system.autoscroll_x_speed == 0
      if $game_system.autoscroll_y_speed == 0
        @panorama.ox = $game_map.display_x / 8
        @panorama.oy = $game_map.display_y / 8
      end
    end
    a = $game_system.autoscroll_x_speed != 0
    b = $game_system.autoscroll_y_speed != 0
    if a or b
      @panorama.ox = @scroll_point_x
      @panorama.oy = @scroll_point_y
    end
  end
  #--------------------------------------------------------------------------
  # * Scroll Panorama
  #--------------------------------------------------------------------------
  def scroll
    w = @panorama.bitmap.width
    h = @panorama.bitmap.height
    @scroll_frames_x += @scroll_speed_x
    @scroll_frames_y += @scroll_speed_y
    while @scroll_frames_x >= 8
      @scroll_frames_x -= 8
      @scroll_point_x += 1
    end
    while @scroll_frames_x <= -8
      @scroll_frames_x += 8
      @scroll_point_x -= 1
    end
    while @scroll_frames_y >= 8
      @scroll_frames_y -= 8
      @scroll_point_y += 1
    end
    while @scroll_frames_y <= -8
      @scroll_frames_y += 8
      @scroll_point_y -= 1
    end
    @scroll_point_x -= w  if @scroll_point_x > w
    @scroll_point_x += w  if @scroll_point_x < -w
    @scroll_point_y -= h  if @scroll_point_y > h
    @scroll_point_y += h  if @scroll_point_y < -h
  end
end

[Mr bones]

Here's what it says when the game starts:
No methodError
undifined method width for nil:NilClass
What should I do about it?

[DerVVulfman]

On which line does this error occur and do you have a 'panorama' set in that tileset?