contain a mesh inside other mesh

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Hi All,

  I have a mesh that is a background, and you can move the other meshes on top of it (and a record the movement).  It's very similar to this example:

what I would like to do is keep the smaller mesh contained within the larger one.  Ideally, I would like to allow users to move the smaller mesh outside the larger one, but not completely off of it (there would still be like a 25px edge of the mesh so you could still touch it and move it).   I am sure I can just compare the xy of the smaller mesh and compare it to the area of the larger mesh, but I'm wondering if there is something that is already being computed that I can use.




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