interactive map?

[tom mystery antar com (tom)]

i'm currently working on a game using gtk.
i have the following problem and not much ideas how to overcome it:

one of the windows will be a map window. it's the main window actually, that's
why there's a menubar on it. so the layout roughly is:


        +--------------------+
        | file options  help |
        |--------------------|
        |                    |
        |       the map      |
        |      comes here    |
        |                    |
        |--------------------|
        | statusbar          |
        +--------------------+

the problems:

- the map is loaded from an xpm (or other image file). different maps have
  different sizes. maps can be loaded without leaving this window. so how do
  i find out the image size and how do i automatically resize this window
  so it fits the map?

- is there a somewhat simple and elegant way to automatically scale the map
  if the window is resized? to allow only proportional resizes of the window?

- how do i get events on the map? the map shall be interactive, so i have to
  know that the player clicked on it, where he clicked and with what button.
  but pixmaps don't seem to receive events.

- the most simple one last: if the map is so small that even after resizing
  it doesn't fill all of the map-window (i.e. width is smaller than the min
  width of the menubar), how do i fill the background with, say, black? i
  tried it with styles, but oddly it changed the style of the menubar instead.