Google Maps API: Calculate Center/Zoom of Polyline

I have an overlay that is dynamically generated from user data, so I need to know how to find the center of that overlay.

Currently, I am just using the first coordinates from the overlay, but that really does not represent the center of the overlay. Therefore when I load the map, it is not centered on the overlay.

Does anyone have a good method for centering the map on the overlay, by calculating the center, not hard coding it?

var latlng = new google.maps.LatLng(38.269239, -122.276010);
    var myOptions = {
        zoom: 15,//Calculate this somehow?
        center: latlng,// Calculate value from array of coordinates?
        mapTypeId: google.maps.MapTypeId.HYBRID
    };