Draw a delaunay triangulation of the points

    :param data: data access object
    :param line_color: line color
    :param line_width: line width
    :param cmap: color map
    :param max_lenght: scaling constant for coloring the edges

def delaunay(data, line_color=None, line_width=2, cmap=None, max_lenght=100):
    """
    Draw a delaunay triangulation of the points

    :param data: data access object
    :param line_color: line color
    :param line_width: line width
    :param cmap: color map
    :param max_lenght: scaling constant for coloring the edges
    """
    from geoplotlib.layers import DelaunayLayer
    _global_config.layers.append(DelaunayLayer(data, line_color, line_width, cmap, max_lenght))