gtk image drawing

first, sorry for my english.

my answer : i have to create an gtk+ interface who can display an image, zoom, get the x y and value of the pixel (on mouse over), and select a region (rectangle).
For the image i had used GtkImage but whe can't draw (?)
I had tryed to use GtkDrawingArea, I'm reading docs since days and days, I think there is something that I don't understand for instance (maybe it's so simple ? ;-) )
Can you tell me witch widget I have to use and how can I do that.

Thank you for your help

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