editing images

["Martin (OpenGeoMap)" <martin opengeomap org>]

Hi all:

I am working in a image viewer using gtk C API and i am a little lost.

- I need pick on the image to get X,Y coordinates and draw a point (from 
other png) where the user is picking.
- I need zoom, panning tools.
- I have packes a image in a viewport.

I am studying the pifbuf API. Do i need something more than this API?
are there signals to all mouse buttons like mouse wheel , mouse wheel 
click, etc...?
Are there tutorial or samples working with images?


Any advices is welcome. :'(

Regards.