I ended up with this:
GLatLng.prototype.distanceFrom = function(a) {
var Scale = 1000;
var dx = Math.pow(((this.lng()-a.lng())/360),2);
var dy = Math.pow(((this.lat()-a.lat())/180),2);
return (Math.sqrt(dx+dy) * Scale);
}
Where "Scale" is the nominal size of your flat "World". E.g. with
Scale=1000, a circle with radius 500 metres (i.e. diameter 1000 metres)
will reach from longitude -180 to +180 and from latitude -90 to +90.
--
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team
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