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

.. only:: html

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

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

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

.. _sphx_glr_examples_image_effect_demo_image_effect.py:


==========
ImageEffects
==========

.. GENERATED FROM PYTHON SOURCE LINES 7-171



.. image-sg:: /examples/image_effect/images/sphx_glr_demo_image_effect_001.png
   :alt: demo image effect
   :srcset: /examples/image_effect/images/sphx_glr_demo_image_effect_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import matplotlib.cm as cm
    import matplotlib.pyplot as plt
    import matplotlib.transforms as mtransforms
    from matplotlib.colors import LightSource
    from matplotlib.artist import Artist
    import numpy as np
    from matplotlib.patheffects import Normal

    from mpl_visual_context.image_effect import (
        AlphaAxb,
        Pad,
        Fill,
        Dilation,
        Gaussian,
        Offset,
        LightSource,
    )

    from mpl_visual_context.patheffects import StrokeOnly, GCModify, FillColor, ImageEffect
    from mpl_visual_context.artist_helper import ArtistListWithPE


    def filtered_text(ax):
        # mostly copied from contour_demo.py

        # prepare image
        delta = 0.025
        x = np.arange(-3.0, 3.0, delta)
        y = np.arange(-2.0, 2.0, delta)
        X, Y = np.meshgrid(x, y)
        Z1 = np.exp(-(X**2) - Y**2)
        Z2 = np.exp(-((X - 1) ** 2) - (Y - 1) ** 2)
        Z = (Z1 - Z2) * 2

        # draw
        ax.imshow(
            Z,
            interpolation='bilinear',
            origin='lower',
            cmap=cm.gray,
            extent=(-3, 3, -2, 2),
            aspect='auto',
        )
        levels = np.arange(-1.2, 1.6, 0.2)
        CS = ax.contour(Z, levels, origin='lower', linewidths=2, extent=(-3, 3, -2, 2))

        # contour label
        cl = ax.clabel(
            CS,
            levels[1::2],  # label every second level
            inline=True,
            fmt='%1.1f',
            fontsize=11,
        )

        # change clabel color to black
        from matplotlib.patheffects import Normal

        for t in cl:
            # t.set_color("k")
            # # to force TextPath (i.e., same font in all backends)
            # t.set_path_effects([Normal()])
            iel = Pad(10) | Fill("w") | Dilation(5) | Gaussian(1)
            t.set_path_effects([ImageEffect(iel), FillColor("k")])

        ax.xaxis.set_visible(False)
        ax.yaxis.set_visible(False)


    def drop_shadow_line(ax):
        # copied from examples/misc/svg_filter_line.py

        # draw lines
        (l1,) = ax.plot([0.1, 0.5, 0.9], [0.1, 0.9, 0.5], "bo-")
        (l2,) = ax.plot([0.1, 0.5, 0.9], [0.5, 0.2, 0.7], "ro-")

        iel = (
            AlphaAxb((0.3, 0))
            | Pad(10)
            | Fill("k")
            | Dilation(3)
            | Gaussian(3)
            | Offset(3, -5)
        )
        pe = [ImageEffect(iel), Normal()]

        for l in [l1, l2]:
            l.set_path_effects(pe)

        ax.set_xlim(0.0, 1.0)
        ax.set_ylim(0.0, 1.0)

        ax.xaxis.set_visible(False)
        ax.yaxis.set_visible(False)


    def drop_shadow_patches(ax):
        # Copied from barchart_demo.py
        N = 5
        group1_means = [20, 35, 30, 35, 27]

        ind = np.arange(N)  # the x locations for the groups
        width = 0.35  # the width of the bars

        rects1 = ax.bar(ind, group1_means, width, color='r', ec="w", lw=2)

        group2_means = [25, 32, 34, 20, 25]
        rects2 = ax.bar(ind + width + 0.1, group2_means, width, color='y', ec="w", lw=2)

        iel = (
            AlphaAxb((0.5, 0))
            | Pad(10)
            | Fill("k")
            | Dilation(3)
            | Gaussian(3)
            | Offset(-3, 3)
        )
        al = ArtistListWithPE(rects1 + rects2, [ImageEffect(iel)])

        al.set_zorder(0.5)
        ax.add_artist(al)

        ax.set_ylim(0, 40)

        ax.xaxis.set_visible(False)
        ax.yaxis.set_visible(False)


    def light_filter_pie(ax):
        fracs = [15, 30, 45, 10]
        explode = (0, 0.1, 0, 0)
        pies = ax.pie(fracs, explode=explode)

        light_filter = ImageEffect(LightSource(erosion_size=4, gaussian_size=4))
        for p in pies[0]:
            p.set_path_effects([light_filter])

        shadow = ImageEffect(
            AlphaAxb((0.7, 0))
            | Pad(10)
            | Fill("k")
            | Dilation(3)
            | Gaussian(7)
            | Offset(5, -5)
        )
        al = ArtistListWithPE(pies[0], [shadow])

        al.set_zorder(0.5)
        ax.add_artist(al)


    if True:
        # if __name__ == "__main__":

        fix, axs = plt.subplots(2, 2, num=1, clear=True)

        filtered_text(axs[0, 0])
        drop_shadow_line(axs[0, 1])
        drop_shadow_patches(axs[1, 0])
        light_filter_pie(axs[1, 1])
        axs[1, 1].set_frame_on(True)

        plt.show()


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

   **Total running time of the script:** (0 minutes 0.153 seconds)


.. _sphx_glr_download_examples_image_effect_demo_image_effect.py:

.. only:: html

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

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: demo_image_effect.zip <demo_image_effect.zip>`


.. only:: html

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

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