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.
#==============================================================================
# ** 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
Autoscrolling Panoramas