[Image-SIG] Twiddle screen pixels

[Stephen J King]

Forgive a relative PIL newbie if this is a trivial matter, but:

I want to use PIL as a framework for testing image processing algorithm
prototypes written in python. I am trying to write something which will
continuously update the screen image as data is generated. I've modified
one of the PIL demos to this:

#
# painter widget

class PaintCanvas(Canvas):
    def __init__(self, master, image):
                Canvas.__init__(self, master, width=image.size[0],
height=image.size[1])
                self.image = image
                self.bind("<B1-Motion>", self.paint)

    def paint(self, event):
                xy = event.x, event.y
                try:
                        self.image.putpixel(xy,0)
                except:
                        pass
                self.update_idletasks()

#
# main

root = Tk()

size=(250,250)
im = Image.new('RGB',size)

PaintCanvas(root, im).pack()

root.mainloop()

###

The problem is that the screen image does not get updated by the
putpixel() call. I would rather not use tiling, as this would add an
unnecessary layer of complexity. Any ideas?

Thanks,
Stephen


--  Stephen J King    Technology Manager   Calibre Digital Pictures  
--  king@calibre-dd.com               http://www.calibredigital.com