Window area in Mapviewer

I would like to window an area in Mapviewer using mouse. Is there any example code or anybody willing to share.
Thanks in advance.
PN

For simple and convex shapes, work around the edge to create a large number of triangles (with one common point in the interior). Then add these up.
For simple, but nonconvex shapes ... there's always [Green's theorem|http://en.wikipedia.org/wiki/Planimeter]! Obtain a path iterator and integrate your way around the shape. Good luck with that.
In "Origin of Species" (written only a few years after the first working planimeter was constructed), Darwin estimates the forrested area of North America by cutting the map out of his atlas and weighing the bits.

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