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