In [1]:

    

import os
import folium

print(folium.__version__)


    

    




0.3.0.dev

In [2]:

    

import numpy as np


def get_coordinates(bbox):
    """
    Create bounding box coordinates for the map.  It takes flat or
    nested list/numpy.array and returns 5 points that closes square
    around the borders.

    Examples
    --------
    >>> bbox = [-87.40, 24.25, -74.70, 36.70]
    >>> len(get_coordinates(bbox))
    5

    """
    bbox = np.asanyarray(bbox).ravel()
    if bbox.size == 4:
        bbox = bbox.reshape(2, 2)
        coordinates = []
        coordinates.append([bbox[0][1], bbox[0][0]])
        coordinates.append([bbox[0][1], bbox[1][0]])
        coordinates.append([bbox[1][1], bbox[1][0]])
        coordinates.append([bbox[1][1], bbox[0][0]])
        coordinates.append([bbox[0][1], bbox[0][0]])
    else:
        raise ValueError('Wrong number corners.'
                         '  Expected 4 got {}'.format(bbox.size))
    return coordinates


    

In [3]:

    

lon = lat = 0
zoom_start = 1

m = folium.Map(location=[lat, lon], zoom_start=zoom_start)

kw = dict(opacity=1.0, weight=4)

# Wrong.
l0 = folium.PolyLine(locations=[(2, 179), (2, -179)], color='red', **kw)

# Correct.
l1 = folium.PolyLine(locations=[(-2, 179), (-2, 181)], color='blue', **kw)

# Correct.
l2 = folium.PolyLine(locations=[(-6, -179), (-6, 179)], color='green', **kw)

# Artifact?
l3 = folium.PolyLine(locations=[(12, -179), (12, 190)], color='orange', **kw)

for l in [l0, l1, l2, l3]:
    m.add_child(l)

m.save(os.path.join('results', 'DateLineExample.html'))

m


    

    
Out[3]: