[racket] draw circle over bitmap and erase old circle

Greetings,

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.

Sincerely,

Mathew Kurian

-- 
Mathew Kurian
Seven Lakes High School
Cell: 8324932862 | Home: 2814929526
Do all the good you can, by all the means you can,
In all the ways you can, in all the places you can,
At all the times you can, to all the people you can,
As long as ever you can." :) John Wesley
*Please be sure to visit SLHS Red Cross Association<http://www.slhsredcross.com>
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