src/js/filter/handler/Filter.Rectangle.js
function(filter) {
		this._startLatLng = filter.northEast;

		var shape = new L.Rectangle(new L.LatLngBounds(this._startLatLng, filter.southWest), this.options.shapeOptions);
		return { type: 'rectangle', 'layer': shape };
	}
function(filter) {
		this._startLatLng = filter.northEast;

		var shape = new L.Rectangle(new L.LatLngBounds(this._startLatLng, filter.southWest), this.options.shapeOptions);
		return { type: 'rectangle', 'layer': shape };
	}
Programmatic way to draw a filter rectangle (bit of a hack)