[wx] Simple image editor

[Michele Petrazzo]

I want to create a simple image editor (with wxPython) for my application.
Now I'm able to zoom, draw with a pen, insert a text into the loaded 
image, and undo changes (for this I reload the image and redraw all the 
lines/text, but not the last.)

My problem is how can I move the texts/lines that are insert into Image, 
after placed? How the image editors (like GIMP) are able to move the 
objects? Please don't tell me to read the GIMP's source :).

Thanks,
Michele

P.s. I hope you understand me, my English is horrible.