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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<title>Artist tests — Matplotlib 3.2.0 documentation</title>

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<div id="unreleased-message"> You are reading an old version of the documentation (v3.2.0). For the latest version see <a href="https://matplotlib.org/stable/gallery/units/artist_tests.html">https://matplotlib.org/stable/gallery/units/artist_tests.html</a></div>

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<h1>Artist tests<a class="headerlink" href="#artist-tests" title="Permalink to this headline">¶</a></h1>

Test unit support with each of the Matplotlib primitive artist types.

The axis handles unit conversions and the artists keep a pointer to their axis

parent. You must initialize the artists with the axis instance if you want to

use them with unit data, or else they will not know how to convert the units

to scalars.

This example requires <a class="reference download internal" download="" href="../../_downloads/0f0fd288c7d4a6a16f4835b96343f597/basic_units.py"><code class="xref download docutils literal notranslate">basic_units.py</code></a>

<div class="highlight-default notranslate"><div class="highlight"><pre>import random

import matplotlib.lines as lines

import matplotlib.patches as patches

import matplotlib.text as text

import matplotlib.collections as collections

from basic_units import cm, inch

import numpy as np

import matplotlib.pyplot as plt

<a href="../../api/_as_gen/matplotlib.figure.Figure.html#matplotlib.figure.Figure" title="View documentation for matplotlib.figure.Figure">fig</a>, <a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a> = <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots">plt.subplots</a>()

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.xaxis.set_units(cm)

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.yaxis.set_units(cm)

# Fixing random state for reproducibility

np.random.seed(19680801)

if 0:

# test a line collection

# Not supported at present.

verts = []

for i in range(10):

# a random line segment in inches

verts.append(zip(*inch*10*np.random.rand(2, <a href="https://docs.python.org/3/library/random.html#random.randint" title="View documentation for random.randint">random.randint</a>(2, 15))))

lc = <a href="../../api/collections_api.html#matplotlib.collections.LineCollection" title="View documentation for matplotlib.collections.LineCollection">collections.LineCollection</a>(verts, axes=<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>)

# test a plain-ol-line

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">line</a> = <a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">lines.Line2D</a>([0*cm, 1.5*cm], [0*cm, 2.5*cm],

lw=2, color='black', axes=<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>)

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.add_line(<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">line</a>)

if 0:

# test a patch

# Not supported at present.

rect = <a href="../../api/_as_gen/matplotlib.patches.Rectangle.html#matplotlib.patches.Rectangle" title="View documentation for matplotlib.patches.Rectangle">patches.Rectangle</a>((1*cm, 1*cm), width=5*cm, height=2*cm,

alpha=0.2, axes=<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>)

<a href="../../api/text_api.html#matplotlib.text.Text" title="View documentation for matplotlib.text.Text">t</a> = <a href="../../api/text_api.html#matplotlib.text.Text" title="View documentation for matplotlib.text.Text">text.Text</a>(3*cm, 2.5*cm, 'text label', ha='left', va='bottom', axes=<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>)

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.add_artist(<a href="../../api/text_api.html#matplotlib.text.Text" title="View documentation for matplotlib.text.Text">t</a>)

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.set_xlim(-1*cm, 10*cm)

<a href="../../api/_as_gen/matplotlib.axes.SubplotBase.html#matplotlib.axes.SubplotBase" title="View documentation for matplotlib.axes.SubplotBase">ax</a>.set_ylim(-1*cm, 10*cm)

# ax.xaxis.set_units(inch)

<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show">plt.show</a>()

</pre></div>

</div>

<a class="reference download internal" download="" href="../../_downloads/06ac97558eeb1567b6a47e79368f8b17/artist_tests.py"><code class="xref download docutils literal notranslate">Download Python source code: artist_tests.py</code></a></div>

<a class="reference download internal" download="" href="../../_downloads/8261808bbe2eafd148234aec95760d82/artist_tests.ipynb"><code class="xref download docutils literal notranslate">Download Jupyter notebook: artist_tests.ipynb</code></a></div>

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Keywords: matplotlib code example, codex, python plot, pyplot

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