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  Detecting specific mouse movements  (Read 1446 times)
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Offline Death33284

Junior Devvie

« Posted 2006-10-10 21:37:26 »

What would be the best way to detect specific mouse movements using the MouseMotionListener? For example, detecting if the user moved their mouse in a circle.
Offline dranonymous

Junior Devvie

Hoping to become a Java Titan someday!

« Reply #1 - Posted 2006-10-10 21:53:13 »

Interesting question...

You could try fitting the user's mouse points to a pattern.  You'd do something like this for a circle

- Collect X number of mouse points (could be based on time or just the last x mouse movements, either way you have a collection of them)
- Find the points with the smallest x and y
- Find the points with the largest x and y
- Take the four points and use the largest and smallest values to construct two new points, which define a bounding box that encompasses all points
- Calc the center of the box
- Create a circle shape, centered in the bounding box with a radius of half the length of the bounding box (you now have a large circle inscribed in a box)
- Create a smaller circle, centered, that extends to say 1/4 the length of the box.
- Now count the number of points that exist between the two circles

You'd have to decide an appropriate number and a tolerance on the relative circle size.  This assumes you're trying to detect not only a circle, but roughly a certain size of circle as well.

Pictures might make more sense in describing this back of the napkin type idea.

Dr. A>
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