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"""
Lasagna Plot (Dense Time-Series Heatmap)
----------------------------------------
"""
# category: tables
import altair as alt
from vega_datasets import data
source = data.stocks()
color_condition = alt.condition(
"month(datum.value) == 1 && date(datum.value) == 1",
alt.value("black"),
alt.value(None),
)
alt.Chart(source, width=300, height=100).transform_filter(
alt.datum.symbol != "GOOG"
).mark_rect().encode(
x=alt.X(
"yearmonthdate(date):O",
axis=alt.Axis(
format="%Y",
labelAngle=0,
labelOverlap=False,
labelColor=color_condition,
tickColor=color_condition,
),
title="Time",
),
y=alt.Y("symbol:N", title=None),
color=alt.Color("sum(price)", title="Price"),
)
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