.. _sphx_glr_gallery_misc_fill_spiral.py:


===========
Fill Spiral
===========





.. image:: /gallery/misc/images/sphx_glr_fill_spiral_001.png
    :align: center





.. code-block:: python

    import matplotlib.pyplot as plt
    import numpy as np

    theta = np.arange(0, 8*np.pi, 0.1)
    a = 1
    b = .2

    for dt in np.arange(0, 2*np.pi, np.pi/2.0):

        x = a*np.cos(theta + dt)*np.exp(b*theta)
        y = a*np.sin(theta + dt)*np.exp(b*theta)

        dt = dt + np.pi/4.0

        x2 = a*np.cos(theta + dt)*np.exp(b*theta)
        y2 = a*np.sin(theta + dt)*np.exp(b*theta)

        xf = np.concatenate((x, x2[::-1]))
        yf = np.concatenate((y, y2[::-1]))

        p1 = plt.fill(xf, yf)

    plt.show()

**Total running time of the script:** ( 0 minutes  0.020 seconds)



.. only :: html

 .. container:: sphx-glr-footer


  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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


.. only:: html

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

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.readthedocs.io>`_