#!/usr/bin/env python
# coding: utf-8

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from ipyleaflet import Map, Heatmap
from random import uniform
import time


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def create_random_data(length):
    "Return a list of some random lat/lon/value triples."
    return [[uniform(-80, 80), 
             uniform(-180, 180), 
             uniform(0, 1000)] for i in range(length)]


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m = Map(center=[0, 0], zoom=2)
m


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heat = Heatmap(locations=create_random_data(1000), radius=20, blur=10)
m.add_layer(heat)


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for i in range(100):
    heat.locations = create_random_data(1000)
    time.sleep(0.1)


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heat.radius = 30


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heat.blur = 50


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heat.max = 0.5


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heat.gradient = {0.4: 'red', 0.6: 'yellow', 0.7: 'lime', 0.8: 'cyan', 1.0: 'blue'}


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heat.locations = [[uniform(-80, 80), uniform(-180, 180), uniform(0, 1000)] for i in range(1000)]