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

.. only:: html

    .. meta::
        :keywords: codex

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

        Click :ref:`here <sphx_glr_download_gallery_misc_anchored_artists.py>`
        to download the full example code

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

.. _sphx_glr_gallery_misc_anchored_artists.py:


================
Anchored Artists
================

This example illustrates the use of the anchored objects without the
helper classes found in :mod:`mpl_toolkits.axes_grid1`. This version
of the figure is similar to the one found in
:doc:`/gallery/axes_grid1/simple_anchored_artists`, but it is
implemented using only the matplotlib namespace, without the help
of additional toolkits.

.. redirect-from:: /gallery/userdemo/anchored_box01
.. redirect-from:: /gallery/userdemo/anchored_box02
.. redirect-from:: /gallery/userdemo/anchored_box03

.. GENERATED FROM PYTHON SOURCE LINES 17-94



.. image-sg:: /gallery/misc/images/sphx_glr_anchored_artists_001.png
   :alt: anchored artists
   :srcset: /gallery/misc/images/sphx_glr_anchored_artists_001.png, /gallery/misc/images/sphx_glr_anchored_artists_001_2_0x.png 2.0x
   :class: sphx-glr-single-img





.. code-block:: default


    from matplotlib import pyplot as plt
    from matplotlib.lines import Line2D
    from matplotlib.patches import Circle, Ellipse
    from matplotlib.offsetbox import (
        AnchoredOffsetbox, AuxTransformBox, DrawingArea, TextArea, VPacker)


    def draw_text(ax):
        """Draw a text-box anchored to the upper-left corner of the figure."""
        box = AnchoredOffsetbox(child=TextArea("Figure 1a"),
                                loc="upper left", frameon=True)
        box.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
        ax.add_artist(box)


    def draw_circles(ax):
        """Draw circles in axes coordinates."""
        area = DrawingArea(40, 20, 0, 0)
        area.add_artist(Circle((10, 10), 10, fc="tab:blue"))
        area.add_artist(Circle((30, 10), 5, fc="tab:red"))
        box = AnchoredOffsetbox(
            child=area, loc="upper right", pad=0, frameon=False)
        ax.add_artist(box)


    def draw_ellipse(ax):
        """Draw an ellipse of width=0.1, height=0.15 in data coordinates."""
        aux_tr_box = AuxTransformBox(ax.transData)
        aux_tr_box.add_artist(Ellipse((0, 0), width=0.1, height=0.15))
        box = AnchoredOffsetbox(child=aux_tr_box, loc="lower left", frameon=True)
        ax.add_artist(box)


    class AnchoredSizeBar(AnchoredOffsetbox):
        def __init__(self, transform, size, label, loc,
                     pad=0.1, borderpad=0.1, sep=2, prop=None, frameon=True):
            """
            Draw a horizontal bar with the size in data coordinate of the given
            axes. A label will be drawn underneath (center-aligned).

            pad, borderpad in fraction of the legend font size (or prop)
            sep in points.
            """
            self.size_bar = AuxTransformBox(transform)
            self.size_bar.add_artist(Line2D([0, size], [0, 0], color="black"))
            self.txt_label = TextArea(label)
            self._box = VPacker(children=[self.size_bar, self.txt_label],
                                align="center",
                                pad=0, sep=sep)
            super().__init__(loc, pad=pad, borderpad=borderpad,
                             child=self._box, prop=prop, frameon=frameon)


    def draw_sizebar(ax):
        """
        Draw a horizontal bar with length of 0.1 in data coordinates,
        with a fixed label underneath.
        """
        asb = AnchoredSizeBar(ax.transData,
                              0.1,
                              r"1$^{\prime}$",
                              loc='lower center',
                              pad=0.1, borderpad=0.5, sep=5,
                              frameon=False)
        ax.add_artist(asb)


    fig, ax = plt.subplots()
    ax.set_aspect(1)

    draw_text(ax)
    draw_circles(ax)
    draw_ellipse(ax)
    draw_sizebar(ax)

    plt.show()


.. _sphx_glr_download_gallery_misc_anchored_artists.py:

.. only:: html

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


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

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

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

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


.. only:: html

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

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