With a [lcd], i put points inside as we do with sensors. I know at which
distance from them my mouse is, using [expr sqrt(($i1-$i3)*($i1-$i3) +
Then i've added variable perimeters around my points, creating new
zones, with the original points as center of these new zones. I need to
know how to calculate when and where i am in these perimeters. Could you
please help me ?