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"""
Ranged Dot Plot
---------------
This example shows a ranged dot plot to convey changing life expectancy for the five most populous countries (between 1955 and 2000).
"""
# category: advanced calculations
import altair as alt
from vega_datasets import data
source = data.countries.url
chart = alt.Chart(
data=source
).transform_filter(
filter={"field": 'country',
"oneOf": ["China", "India", "United States", "Indonesia", "Brazil"]}
).transform_filter(
filter={'field': 'year',
"oneOf": [1955, 2000]}
)
line = chart.mark_line(color='#db646f').encode(
x='life_expect:Q',
y='country:N',
detail='country:N'
)
# Add points for life expectancy in 1955 & 2000
points = chart.mark_point(
size=100,
opacity=1,
filled=True
).encode(
x='life_expect:Q',
y='country:N',
color=alt.Color('year:O',
scale=alt.Scale(
domain=[1955, 2000],
range=['#e6959c', '#911a24']
)
)
).interactive()
(line + points)
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