Simple Window Opacity Help

[battlestar_caprica]

This should be fairly simple so i'll be quick.
I'm working on a HUD for my game that uses windows with full opacity. However, whenever the player walks behind the HUD, I want the HUD to become transparent.
I already know how to make the opacity change (window.opacity = 150). What I'm asking is how do I check whether the player is walking into the HUD or not so that I can trigger the opacity change.

Here's a picture of what I mean...
http://i61.photobucket.com/albums/h72/R ... /helpo.jpg[/img]


Here's the script... (which does nothing right now besides draw a window)

class Game_Map
attr_reader :map_minimap
  
alias map_minimap_setup setup

end

class Scene_Map

alias map_minimap_main main
alias map_minimap_update update
  
def main
#@spriteset_map = Spriteset_Map.new
@message_window = Window_Message.new
# Add name of map to window
@minimap_window = Window_Minimap.new
@minimap_window.opacity = 255
@minimap_window.x = 490
@minimap_window.y = 330
map_minimap_main
@minimap_window.dispose
end

def update
  @minimap_window.update
  map_minimap_update
end

end

class Window_Minimap < Window_Base

def initialize
super(0, 0, 150, 150)
self.contents = Bitmap.new(width - 32, height - 32)
refresh
end


def refresh
self.contents.clear
end

def update
super
refresh
end

end

Any help would be quite appreciated.
Thanks in advance.

 

[ancient algebra]

Well, screen_x and screen_y retrieve a Game_Character object's position.

So, just check $game_player.screen_x and $game_player.screen_y and when ever he is in the vicinity, just lower the opacity. You would probably want to perform the check when the player moves - there might be a more clever way to do it but that is my first impression of the problem

 

[battlestar_caprica]

EDIT: Thanks ancient algebra! I have it semi-working now...

EDIT AGAIN: Have it fully working now.

This thread can be locked. Thank you again.

 

[ancient algebra]

No problem. I'm happy to help.