There are a bunch of algorithms for testing if a point lies within a
polygon. You could test each polygon with one of those.

Here are some with code examples (in c but the javascript would be
virtually identical) http://local.wasp.uwa.edu.au/~pbourke/geometry/insidepoly/

Cheers,
Chris

On Sep 18, 10:56 pm, "Josh Rosenthal" <[EMAIL PROTECTED]> wrote:
> Hmm.  I like.  However, are we dependent on relying on user interaction in
> the form of clicks?  Simulating this for say... a marker's dragend event,
> doesn't provide the overlay parameter.  Even were we to trigger a click
> programmatically, it seems that we'd need to know the overlay in advance.
>  Can we get our "coordinate not in clickable polygon" info from other
> coordinate based events?
>
> On Thu, Sep 18, 2008 at 2:41 AM, Mike Williams <[EMAIL PROTECTED]>wrote:
>
>
>
> > You can easily recognise clicks that occur on the base map rather than
> > on a clickable polygon by noticing that the second parameter of the map
> > "click" event is null.
>
> > That won't help if the click finds a clickable marker or info window
> > above the polygon layer.
>
> > --
> >http://econym.org.uk/gmap
> > The Blackpool Community Church Javascript Team
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