# Set up for JupyterLite
try:
    import piplite
    await piplite.install('ipyleaflet')
except ImportError:
    pass

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

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)
    ]

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

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

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

heat.radius = 30

heat.blur = 50

heat.max = 0.5

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

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