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

.. _gallery_line_chart_with_color_datum:


Line Chart with Datum for Color
-------------------------------
An example of using ``datum`` and ``repeat`` to color a multi-series line chart.
This is adapted from this corresponding Vega-Lite Example:
`Repeat and Layer to Show Different Movie Measures <https://vega.github.io/vega-lite/examples/repeat_layer.html>`_.


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



    import altair as alt
    from vega_datasets import data

    source = data.movies()

    alt.Chart(source).mark_line().encode(
        x=alt.X("IMDB_Rating", bin=True),
        y=alt.Y(
            alt.repeat("layer"), aggregate="mean", title="Mean of US and Worldwide Gross"
        ),
        color=alt.datum(alt.repeat("layer")),
    ).repeat(layer=["US_Gross", "Worldwide_Gross"])


.. tab-set::

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

        .. code:: python



            import altair as alt
            from vega_datasets import data

            source = data.movies()

            alt.Chart(source).mark_line().encode(
                alt.X("IMDB_Rating").bin(True),
                alt.Y(alt.repeat("layer"))
                    .aggregate("mean")
                    .title("Mean of US and Worldwide Gross"),
                color=alt.datum(alt.repeat("layer")),
            ).repeat(
                layer=["US_Gross", "Worldwide_Gross"]
            )


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

        .. code:: python



            import altair as alt
            from vega_datasets import data

            source = data.movies()

            alt.Chart(source).mark_line().encode(
                x=alt.X("IMDB_Rating", bin=True),
                y=alt.Y(
                    alt.repeat("layer"), aggregate="mean", title="Mean of US and Worldwide Gross"
                ),
                color=alt.datum(alt.repeat("layer")),
            ).repeat(layer=["US_Gross", "Worldwide_Gross"])