x, y coordinates in Tkinter canvas

[jepler at unpythonic.net]

Let's find out!  This program creates a series of rectangles, with the color
going from black to nearly white.  White corresponds to higher x and y
coordinate values.  So the answer to your question can be seen in the output
of the program.

import Tkinter

c = Tkinter.Canvas(width=220, height=220)
c.pack()

for i in range(0, 200, 20):
        lum = i * 255 / 200
        color = "#%02x%02x%02x" % (lum, lum, lum)
        c.create_rectangle( i, i, i+40, i+40, fill=color)

c.mainloop()
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