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"""
Parallel Coordinates Example
----------------------------
A `Parallel Coordinates <https://en.wikipedia.org/wiki/Parallel_coordinates>`_
chart is a chart that lets you visualize the individual data points by drawing
a single line for each of them.
Such a chart can be created in Altair by first transforming the data into a
suitable representation.
This example shows a parallel coordinates chart with the Iris dataset.
"""
# category: other charts
import altair as alt
from vega_datasets import data
source = data.iris()
alt.Chart(source).transform_window(
index='count()'
).transform_fold(
['petalLength', 'petalWidth', 'sepalLength', 'sepalWidth']
).mark_line().encode(
x='key:N',
y='value:Q',
color='species:N',
detail='index:N',
opacity=alt.value(0.5)
).properties(width=500)
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