.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/plot_logo.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

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

        :ref:`Go to the end <sphx_glr_download_auto_examples_plot_logo.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_plot_logo.py:


Generate the splinebox logo
---------------------------

This example shows how the `S` of the splinebox logo is
constructed using a B3 spline.

.. GENERATED FROM PYTHON SOURCE LINES 8-39



.. image-sg:: /auto_examples/images/sphx_glr_plot_logo_001.png
   :alt: plot logo
   :srcset: /auto_examples/images/sphx_glr_plot_logo_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import matplotlib
    import matplotlib.pyplot as plt
    import numpy as np
    import splinebox.basis_functions
    import splinebox.spline_curves

    points = np.array([[1, 2], [0, 2], [0, 1], [1, 1], [1, 0], [0, 0]])
    M = len(points)
    padded_points = np.concatenate(
        [
            np.array([[1.5, 1.5]]),
            points,
            np.array([[-0.5, 0.5]]),
        ]
    )
    basis_function = splinebox.basis_functions.B3()
    spline = splinebox.spline_curves.Spline(M=M, basis_function=basis_function, closed=False, coeffs=padded_points)
    ts = np.linspace(0, M - 1, 100)
    vals = spline.eval(ts)

    b3_max = 2 / 3
    for t, val in zip(ts, vals):
        for k, point in enumerate(points):
            weight = basis_function.eval(t - k)
            color = matplotlib.cm.viridis(weight / b3_max)
            plt.plot([val[0], point[0]], [val[1], point[1]], linewidth=5 * weight, color=color)
    plt.plot(points[:, 0], points[:, 1], "-o", color="gray", linewidth=7, markersize=10)
    plt.plot(vals[:, 0], vals[:, 1], "-", color="red", linewidth=7)
    plt.gca().axis("equal")
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.529 seconds)


.. _sphx_glr_download_auto_examples_plot_logo.py:

.. only:: html

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

    .. container:: sphx-glr-download sphx-glr-download-jupyter

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

    .. container:: sphx-glr-download sphx-glr-download-python

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


.. only:: html

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

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