def collection_props(event):
    """
    Get information for a pick event on an artist collection (e.g.
    LineCollection, PathCollection, PatchCollection, etc).  This will"""
    ind = event.ind[0]
    arr = event.artist.get_array()
    if arr is None or len(arr) == 1:
        z = None
    else:
        z = arr[ind]
    return dict(z=z, c=z)
