Polygon in visible area?

[NoRyb]

Hello

Is it possible to find out, if a polygon is currently in the visible area? So I can get more details from a webservice about an object if it is visible...

Thank you

~N

[Andrew Leach]

An easy approximation is to check whether the polygon's bounds
intersects with the map bounds.
http://code.google.com/apis/maps/documentation/javascript/reference.html#LatLngBounds
(scroll down to intersects)

That won't be perfect, but it should provide more data than is
necessary rather than leaving something out which should be retrieved.

[NoRyb]

how do I get the "LatLngBounds" out of a polygon so I can use intersect?

[geoco...@gmail.com]

On Jan 23, 4:53 am, NoRyb <phrei....@gmail.com> wrote:
> Hello
>
> Is it possible to find out, if a polygon is currently in the visible area?

You mean something like this (warning complex kml rendered in the
browser):
http://www.geocodezip.com/geoxml3_test/v3_geoxml3_ecounties-out_highlightSidebar.html?lat=33&lng=-114&zoom=8

The sidebar is dynamically generated from polygons in the viewport.

-- Larry

[NoRyb]

most probably this could hep me. What technique do you use to do this?

thanks!

[NoRyb]

oh I see... you create a Bound rectangle for each polygon yourself. That's an option. I hoped there would be something in the API to get that but I will probably do it your way.

Thank you very much.