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chaos.proton@gmail.com e803640027 avoid divided by zero error
The old code only checks touch->max_x > touch->min_x but not touch->max_x == touch->min_x. Thus may lead to divided by zero error.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1782 bbd45198-f89e-11dd-88c7-29a3b14d5316
2011-11-02 08:58:34 +00:00
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