Javascript Google map api V3 fitbounds with center location

Question

I want to fitbound pushpins to visible all around user's location pushpin. i wrote the following code it center the user location but few pushpin goes out of map ??

FYI: userPinLoc is pushpin object which is already populated

 function setInitialZoom() {
            mapZoom = googleMap.getZoom(); 
            var bounds = new google.maps.LatLngBounds();
            bounds.extend(userPinLoc);
            for (i in nearestEntitiesToZoom) {
                entity = nearestEntitiesToZoom[i];
                var googleLatLng = new google.maps.LatLng(entity.latitude,entity.longitude);
                bounds.extend(googleLatLng);
            }

            google.maps.event.addDomListener(googleMap, 'bounds_changed', function() {
                googleMap.setCenter(userPinLoc);
            });
                 googleMap.fitBounds(bounds);
        }

Answer 1

I did it using java and javascript

public static void calculateMapFitBounds(GeoLocation userLocation, List<GeoLocation> contents, Map<String, GeoLocation> latlngBounds){

    if (Util.isEmtpyGeoLocation(userLocation) || contents == null || contents.isEmpty()) {
        return;
    }

    //SW
    double minLat = userLocation.getLatitude();
    double minLng = userLocation.getLongitude();

    //NE
    double maxLat = userLocation.getLatitude();
    double maxLng = userLocation.getLongitude();

    for(GeoLocation content: contents){

        /*
         * Populating Top left cordinate (SW)
         */
        minLat = Math.min(minLat, content.getLatitude());
        minLng = Math.min(minLng, content.getLongitude());

        /*
         * Populating Bottom right cordinate (NE)
         */
        maxLng = Math.max(maxLng, content.getLongitude()) ;
        maxLat = Math.max(maxLat, content.getLatitude());
    }

    /*
     * Calculating Delta fit bounds
     */

    double latDelta = Math.max(Math.abs(userLocation.getLatitude() - minLat), Math.abs(maxLat-userLocation.getLatitude()));

    double lngDelta = Math.max(Math.abs(userLocation.getLongitude() - maxLng), Math.abs(minLng - userLocation.getLongitude()));

    //Calculating SW
    minLat = userLocation.getLatitude() - latDelta;
    minLng = userLocation.getLongitude()- lngDelta;


    latlngBounds.put("swLatLng", new GeoLocation(minLat, minLng));


    //Calculating NE
    maxLat = userLocation.getLatitude() + latDelta;
    maxLng = userLocation.getLongitude()+ lngDelta;

    latlngBounds.put("neLatLng", new GeoLocation(maxLat, maxLng));

}

I am using velocity views so here is velocity and js code

#if($swLatLng && $neLatLng)
        var swLatLn = new google.maps.LatLng($!swLatLng.latitude, $!swLatLng.longitude, false);
        var neLatLn = new google.maps.LatLng($neLatLng.latitude, $neLatLng.longitude, false);

        var bounds = new google.maps.LatLngBounds(swLatLn, neLatLn);
        googleMap.fitBounds(bounds);

        #end