Google Maps API fitBoundsPerfectly

fitBoundsPerfectly.js

// 2014-12-16
google.maps.Map.prototype.fitBoundsPerfectly = function fitBoundsPerfectly(aBounds) {
	var mapBounds, mapSW, mapNE, mapDLat, mapDLng, aSW, aNE, dLat, dLng, ratio, dZoom;

	mapBounds = this.getBounds();
	mapSW = mapBounds.getSouthWest();
	mapNE = mapBounds.getNorthEast();
	mapDLat = mapNE.lat() - mapSW.lat();
	mapDLng = mapNE.lng() - mapSW.lng();

	aSW = aBounds.getSouthWest();
	aNE = aBounds.getNorthEast();
	dLat = aNE.lat() - aSW.lat();
	dLng = aNE.lng() - aSW.lng();

	ratio = Math.max(dLat / mapDLat, dLng / mapDLng);
	dZoom = -Math.ceil(Math.log(ratio) / Math.log(2));

	if (dZoom) {
		this.setZoom(this.getZoom() + dZoom);
	}
	this.panTo(aBounds.getCenter());
};