Real-time Magnifying Glass: An Interactive Animation Example

This program demonstrates how to implement a not-so-simple real time magnifying glass.

How to use:
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just type:

magnifier

or

magnifier(mask, FPS)

where
mask is the shape of the magnifying glass which takes one of the following values:

"circle" - unsmoothed circular window
"aacircle" - smoothed circular window (default)
"gaussian" - guassian window
other string value - rectangular window

FPS defines how many time the position of the magnifying glass should be updated per second. By default, its value is 20.

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The picture used in this program was taken from the A-li comic book series drawn by Xu Han (aka "Hans").

The Chinese text on the top left corner reads:
"On the Friday morning, A-li (roughly equivalent to 'foxy' in English) hung himself on the clothes rope, in an attempt to pull his ears longer...

-It was said that he fell in love with the rabbit."
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