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Merge pull request #553 from eitanlees/horizon-graph
Horizon Graph Example
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""" | ||
Horizon Graph | ||
------------- | ||
This example shows how to make a Horizon Graph with 2 layers. (See https://idl.cs.washington.edu/papers/horizon/ for more details on Horizon Graphs.) | ||
""" | ||
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import altair as alt | ||
import pandas as pd | ||
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df = pd.DataFrame([ | ||
{"x": 1, "y": 28}, {"x": 2, "y": 55}, | ||
{"x": 3, "y": 43}, {"x": 4, "y": 91}, | ||
{"x": 5, "y": 81}, {"x": 6, "y": 53}, | ||
{"x": 7, "y": 19}, {"x": 8, "y": 87}, | ||
{"x": 9, "y": 52}, {"x": 10, "y": 48}, | ||
{"x": 11, "y": 24}, {"x": 12, "y": 49}, | ||
{"x": 13, "y": 87}, {"x": 14, "y": 66}, | ||
{"x": 15, "y": 17}, {"x": 16, "y": 27}, | ||
{"x": 17, "y": 68}, {"x": 18, "y": 16}, | ||
{"x": 19, "y": 49}, {"x": 20, "y": 15} | ||
]) | ||
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area1 = alt.Chart(df).mark_area(clip=True, interpolate='monotone').encode( | ||
x = alt.X('x', scale=alt.Scale(zero=False, nice=False)), | ||
y = alt.Y('y', scale=alt.Scale(domain=[0, 50]), | ||
axis=alt.Axis(title='y')), | ||
opacity = alt.value(0.6) | ||
).properties( | ||
width=300, | ||
height=50 | ||
) | ||
area2 = alt.Chart(df).mark_area(clip=True, interpolate='monotone').encode( | ||
x = 'x', | ||
y = alt.Y('ny:Q', scale=alt.Scale(domain=[0, 50])), | ||
opacity = alt.value(0.3) | ||
).transform_calculate("ny", "datum.y - 50") | ||
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chart = area1 + area2 |