Rysowanie boxa na mapie

function rysowanieBoxa() {
 if (boxes != null) {
  for (var i = 0; i < boxes.length; i++) {
   var vertices = [
   boxes[i].getSouthWest(),
   new GLatLng(boxes[i].getSouthWest().lat(),
    boxes[i].getNorthEast().lng()),
   boxes[i].getNorthEast(),
   new GLatLng(boxes[i].getNorthEast().lat(),
    boxes[i].getSouthWest().lng()),
   boxes[i].getSouthWest()
   ];
   var polygon = new GPolyline(vertices, '#ff0000', 1, 1.0);
   map.addOverlay(polygon);
  }
 }
}