[Image-SIG] "Cloning" drawing interface objects

[John Wolter]

Forgive me if this is a real newbie question, but hey, as far as PIL goes,
I'm a newbie.  I'm trying to write a script that draws on an image, then
splits the image into two copies and draws more on them independently.  I
can't seem to figure out how to do that second part.  I've written up a
sample script to demonstrate the issue.  If working correctly, the output
file snippet11a.png should contain a triangle, snippet11b.jpg should contain
the triangle with a rectangle superimposed, and snippet11c.jpg should
contain the triangle with a circle superimposed (but not the rectangle).

Can anyone suggest a path?  If it helps, I'm running python 2.6.1 on Windows
Vista (not my preferred environment).

import Image, aggdraw
size = 400, 300
cwhite = 255, 255, 255
# 23-Aug-2009
# This little program is an experiment in what it takes to make separate
# images, which can be drawn on separately from each other.  I have been
# having a problem that drawing on any copy of an image ends up drawing on
# the original image.  The only way I found that creates a truly independent
# image is to start from a separate Image.new() call.
Im2 = Image.new("RGBA", size, cwhite)
Im3 = Image.new("RGBA", size, cwhite)
draw2 = aggdraw.Draw(Im2)
color1 = (0,0,127)
opacity1 = 127
brush1 = aggdraw.Brush(color1, opacity=opacity1)
draw2.polygon((100, 100, 300, 100, 200, 200), aggdraw.Pen("black"), brush1)
draw2.flush()
Im2.save("C:\Temp\snippet11a.png")
# Im3 = Im2.copy # This command causes a "AttributeError: 'function' object
#    has no attribute 'mode'" error at the next draw on Im3
draw2a = draw2 # Drawing on a copy of the draw object will draw on the same
image
draw2a.rectangle((50, 50, 250, 250), aggdraw.Pen("black"), brush1)
draw2a.flush()
Im2.save("C:\Temp\snippet11b.png")
draw3 = aggdraw.Draw(Im3)
draw3.ellipse((150, 50, 350, 250), aggdraw.Pen("black"), brush1)
draw3.flush()
Im3.save("C:\Temp\snippet11c.png")
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