[wx] Simple image editor

[Scott David Daniels]

Michele Petrazzo wrote:
> ... if I have a lot of "objects", I must attempt [to] redraw all.
One simplification that can speed things up tremendously (in the case
that you can ignore write order), is to have a "selected" object, and
an image of "everything else" on which you draw the "selected" object
as you move it around.

-Scott David Daniels
Scott.Daniels at Acm.Org