[racket] draw circle over bitmap and erase old circle

From: Mathew Kurian (bluejamesbond at gmail.com)
Date: Wed Oct 27 23:28:43 EDT 2010


According to Racket Docs:

----Just set style-----

'transparent – the canvas is automatically “erased” before an update using
it’s parent window’s background; the result is undefined if this flag is
combined with 'no-autoclear

Hopefully that helps.


Mathew Kurian

Mathew Kurian
Seven Lakes High School
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