Wasn't it Rossko who wrote:
>There used to be a Google blog post (2007) about the algorithm used, 
>but that seems to have got lost when they changed the blog.

There's this one about the poly "click" detection, but I don't remember 
anything specific about "mouseover" and "mouseout" handling:

http://googlemapsapi.blogspot.com/2007/09/v288-clickable-polylines-polygo
ns.html

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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