Center a map in Titanium + Underscore && Collections

center-map-annotations-collection.js

var bb = [
	_.min($$.pluck('lat')), _.min($$.pluck('lng')),
	_.max($$.pluck('lat')), _.max($$.pluck('lng'))
	];
$.map.region = {
	latitude: (bb[0]+bb[2])/2,
	longitude: (bb[1]+bb[3])/2,
	latitudeDelta: 1.4*(bb[2]-bb[0]),
	longitudeDelta: 1.4*(bb[3]-bb[1])
};