Plot / Vega-lite / Update

Periodically update a Vega-lite plot.

from h2o_wave import site, data, ui
import random
import time
page = site['/demo']
spec = '''
{
"description": "A simple bar plot with embedded data.",
"mark": "bar",
"encoding": {
"x": {"field": "a", "type": "ordinal"},
"y": {"field": "b", "type": "quantitative"}
}
}
'''
# Generate random datum between 1 and 100
def rnd():
return random.randint(1, 100)
# Get data rows for our plot.
# Typically, this data would be read from some external data source.
def poll():
return [
["A", rnd()], ["B", rnd()], ["C", rnd()],
["D", rnd()], ["E", rnd()], ["F", rnd()],
["G", rnd()], ["H", rnd()], ["I", rnd()]
]
vis = page.add('external', ui.vega_card(
box='1 1 2 4',
title='Plot with external data',
specification=spec,
data=data(fields=["a", "b"], rows=poll()),
))
page.save()
while True:
time.sleep(1)
# Update the plot's data rows
vis.data = poll()
page.save()

Tags: โ€‚plot โ€‚vega