.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_gallery_lines_bars_and_markers_fill.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_lines_bars_and_markers_fill.py:


==============
Fill plot demo
==============

Demo fill plot.


First, the most basic fill plot a user can make with matplotlib:



.. code-block:: python

    import numpy as np
    import matplotlib.pyplot as plt

    x = [0, 1, 2, 1]
    y = [1, 2, 1, 0]

    fig, ax = plt.subplots()
    ax.fill(x, y)
    plt.show()




.. image:: /gallery/lines_bars_and_markers/images/sphx_glr_fill_001.png
    :class: sphx-glr-single-img




Next, a few more optional features:

* Multiple curves with a single command.
* Setting the fill color.
* Setting the opacity (alpha value).



.. code-block:: python



    x = np.linspace(0, 1.5 * np.pi, 500)
    y1 = np.sin(x)
    y2 = np.sin(3 * x)

    fig, ax = plt.subplots()

    ax.fill(x, y1, 'b', x, y2, 'r', alpha=0.3)

    # Outline of the region we've filled in
    ax.plot(x, y1, c='b', alpha=0.8)
    ax.plot(x, y2, c='r', alpha=0.8)
    ax.plot([x[0], x[-1]], [y1[0], y1[-1]], c='b', alpha=0.8)
    ax.plot([x[0], x[-1]], [y2[0], y2[-1]], c='r', alpha=0.8)

    plt.show()



.. image:: /gallery/lines_bars_and_markers/images/sphx_glr_fill_002.png
    :class: sphx-glr-single-img





.. _sphx_glr_download_gallery_lines_bars_and_markers_fill.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

     :download:`Download Python source code: fill.py <fill.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: fill.ipynb <fill.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    Keywords: matplotlib code example, codex, python plot, pyplot
    `Gallery generated by Sphinx-Gallery
    <https://sphinx-gallery.readthedocs.io>`_
