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Monte Carlo Pi approximation

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This algorithm randomly places dots on the screen. Dots within the quarter circle are counted. The ratio between these dots and the total number of dots should be pi/4 (the ratio of the quarter-circle to the square area). The dot-ratio is multiplied by 4 to approximate pi. Press space to add 1 dot. Press ENTER to add 100 dots. Press 'r' to restart.
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