.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_layer_line_color_rule:


Line Chart with Layered Aggregates
----------------------------------
This example shows how to make a multi-series line chart of the daily closing
stock prices for AAPL, AMZN, GOOG, IBM, and MSFT between 2000 and 2010, along
with a layered rule showing the average values.


.. altair-plot::
    :code-below:

    
    import altair as alt
    from vega_datasets import data

    source = data.stocks()

    base = alt.Chart(source).properties(width=550)

    line = base.mark_line().encode(
        x='date',
        y='price',
        color='symbol'
    )

    rule = base.mark_rule().encode(
        y='average(price)',
        color='symbol',
        size=alt.value(2)
    )

    line + rule


.. toctree::
   :hidden: