:orphan:
:html_theme.sidebar_secondary.remove:

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

.. _gallery_layered_area_chart:


Layered Area Chart
------------------
This example shows a layered area chart.


.. altair-plot::
    :remove-code:
    


    import altair as alt
    from vega_datasets import data

    source = data.iowa_electricity()

    alt.Chart(source).mark_area(opacity=0.3).encode(
        x="year:T",
        y=alt.Y("net_generation:Q", stack=None),
        color="source:N"
    )


.. tab-set::

    .. tab-item:: Method syntax
        :sync: method

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.iowa_electricity()

            alt.Chart(source).mark_area(opacity=0.3).encode(
                x="year:T",
                y=alt.Y("net_generation:Q").stack(None),
                color="source:N"
            )


    .. tab-item:: Attribute syntax
        :sync: attribute

        .. code:: python


            import altair as alt
            from vega_datasets import data

            source = data.iowa_electricity()

            alt.Chart(source).mark_area(opacity=0.3).encode(
                x="year:T",
                y=alt.Y("net_generation:Q", stack=None),
                color="source:N"
            )