I want to calculate whether the mouse cursor lies near a polyline.
Fpr this I'm using the isLocationOnEdge method.

The problem is that the calculated distance from the mouse cursor to
the polyline changes at any zoom level, so it's impossible to use a
static value for the tolerance.

So I'm looking for a factor depending on the zoom level to have
approximately the same visible distance from the mouse cursor to the
polyline in every zoom level.

It must'nt be completely accurate but should be approximately right.

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