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i know how to do polygons with Google Maps API.
http://code.google.com/apis/maps/documentation/javascript/overlays.html#Polygons
How did Trulia.com done their Polygon-Search?
http://www.trulia.com/for_sale/Berlin,NH/x_map#for_sale/My%20Custom%20Area__awunGvsqqL%7CgCpGrlCkrKlzCh%60FofHb%7BL_sp/x_map
Do they use a complete custom JS (like Raphael) do do their Polysearch or is this possible by extending the Google Maps drawing Libraries?
They wrote their own since theirs predated the Google Maps API Drawing Library. However, it’s pretty simple now using the Drawing Library so I’d recommend using it instead.