33 lines
631 B
Python
33 lines
631 B
Python
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"""
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Bar and Tick Chart
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------------------
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How to layer a tick chart on top of a bar chart.
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"""
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# category: bar charts
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import altair as alt
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import pandas as pd
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source = pd.DataFrame({
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'project': ['a', 'b', 'c', 'd', 'e', 'f', 'g'],
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'score': [25, 57, 23, 19, 8, 47, 8],
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'goal': [25, 47, 30, 27, 38, 19, 4]
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})
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bar = alt.Chart(source).mark_bar().encode(
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x='project',
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y='score'
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).properties(
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width=alt.Step(40) # controls width of bar.
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)
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tick = alt.Chart(source).mark_tick(
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color='red',
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thickness=2,
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size=40 * 0.9, # controls width of tick.
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).encode(
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x='project',
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y='goal'
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)
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bar + tick
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