GtkImage programming advice required

[Mike Durham <mdurham people net au>]

Hi,

I'm struggling a bit with my first gtkmm prog and need a bit of advice.

I 'm using Anjuta on Linux and have a main window with buttons, sliders 
etc created in Glade and also a placeholder for an image. A GtkImage (is 
this correct?). The image will be an analogue meter indicating signal 
strength. I have the background bitmap to put into the GtkImage but I 
have to draw a black line for the needle, and of course update it as and 
when the signal strength changes.

So, I guess my question is how do I blit a bitmap image into the 
GtkImage placeholder?

I have attempted to find examples of this but they just show simple 
writing to the whole main window or just loading a bitmap from a file. 
This of course is not what I want.

Any help would be much appreciated.


TIA, Mike