google.maps.event.addListener(drawingManager, 'overlaycomplete', function(e) {
    all_overlays.push(e);
    if (e.type != google.maps.drawing.OverlayType.MARKER) {
    // Switch back to non-drawing mode after drawing a shape.
    drawingManager.setDrawingMode(null);
    // Add an event listener that selects the newly-drawn shape when the user
    // mouses down on it.
    var newShape = e.overlay;
    newShape.type = e.type;
    google.maps.event.addListener(newShape, 'click', function() {
      setSelection(newShape);
    });
    setSelection(newShape);
  }
});

function deleteAllShape() {
  for (var i=0; i < all_overlays.length; i++)
  {
    all_overlays[i].overlay.setMap(null);
  }
  all_overlays = [];
}