On Sun, Apr 20, 2008 at 9:13 PM, hjc520070 <[EMAIL PROTECTED]> wrote:
>
>  Thanks for your help. I get it work. However, an interesting thing appears.
>  The following two codes(code 1 and code 2) makes different result??? Only
>  set background in different place. Anyone can tell me why? I am eager to
>  know it.


In code2, you copy the background before the canvas is drawn, which is
wrong.  code 1 is the correct approach.  Calling ax.plot is not enough
to cause the background to be drawn.  You must call fig.canvas.draw
first.

JDH

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