とりあえず例を挙げました。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/src/markerclusterer.js"></script>
<style>
html, body, #map_canvas {
height: 100%;
width: 100%;
margin: 0;
padding: 0;
}
</style>
<script type='text/javascript'>
var mapCanvas;
function initalize() {
// Creating a map
var mapDiv = document.getElementById("map_canvas");
mapCanvas = new google.maps.Map(mapDiv, {
mapTypeId : google.maps.MapTypeId.ROADMAP
});
// Generate bunch of path data
var sw = new google.maps.LatLng(-19.448292, -152.012329);
var ne = new google.maps.LatLng(76.150236, 58.925171);
var bounds = new google.maps.LatLngBounds(sw, ne);
mapCanvas.setCenter(bounds.getCenter());
mapCanvas.setZoom(3);
var baseLat, baseLng, category, json = [], path;
for (var i = 0; i < 100; i++) {
baseLat = Math.random() * (ne.lat() - sw.lat()) + sw.lat();
baseLng = Math.random() * (ne.lng() - sw.lng()) + sw.lng();
path = [
new google.maps.LatLng(baseLat, baseLng),
new google.maps.LatLng(baseLat + 1, baseLng + 1),
new google.maps.LatLng(baseLat, baseLng + 2)
];
json.push(path);
}
var bounds, polyList = [];
for (var i = 0, length = json.length; i < length; i++) {
var polyline = createPolygon(json[i]);
polyList.push(polyline);
}
var clusterer = new MarkerClusterer(mapCanvas, polyList);
}
function createPolygon(path) {
var polygon = new google.maps.Polygon({
path : path,
strokeOpacity : 1,
strokeColor : "red"
});
var lastPath = null,
lastCenter = null;
polygon.getPosition = function() {
var path = this.getPath();
if (lastPath == path) {
return lastCenter;
}
lastPath = path;
var bounds = new google.maps.LatLngBounds();
path.forEach(function(latlng, i) {
bounds.extend(latlng);
});
lastCenter = bounds.getCenter()
return lastCenter;
};
return polygon;
}
google.maps.event.addDomListener(window, "load", initalize);
</script>
</head>
<body>
<div id="map_canvas"></div>
</body>
</html>