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

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<title>Artist within an artist — Matplotlib 2.2.3 documentation</title>

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

Override basic methods so an artist can contain another

artist. In this case, the line contains a Text instance to label it.

<div class="highlight-python notranslate"><div class="highlight"><pre>import numpy as np

import matplotlib.pyplot as plt

import matplotlib.lines as lines

import matplotlib.transforms as mtransforms

import matplotlib.text as mtext

class MyLine(<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">lines.Line2D</a>):

def __init__(self, *args, **kwargs):

# we'll update the position when the line data is set

self.text = <a href="../../api/text_api.html#matplotlib.text.Text" title="View documentation for matplotlib.text.Text">mtext.Text</a>(0, 0, '')

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">lines.Line2D</a>.__init__(self, *args, **kwargs)

# we can't access the label attr until *after* the line is

# inited

self.text.set_text(self.get_label())

def set_figure(self, figure):

self.text.set_figure(figure)

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">lines.Line2D</a>.set_figure(self, figure)

def set_axes(self, axes):

self.text.set_axes(axes)

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D">lines.Line2D</a>.set_axes(self, axes)

def set_transform(self, transform):

# 2 pixel offset

texttrans = transform + <a href="../../api/transformations.html#matplotlib.transforms.Affine2D" title="View documentation for matplotlib.transforms.Affine2D">mtransforms.Affine2D</a>().translate(2, 2)

self.text.set_transform(texttrans)

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_transform" title="View documentation for matplotlib.lines.Line2D.set_transform">lines.Line2D.set_transform</a>(self, transform)

def set_data(self, x, y):

if len(x):

self.text.set_position((x[-1], y[-1]))

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_data" title="View documentation for matplotlib.lines.Line2D.set_data">lines.Line2D.set_data</a>(self, x, y)

def draw(self, renderer):

# draw my label at the end of the line with 2 pixel offset

<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.draw" title="View documentation for matplotlib.lines.Line2D.draw">lines.Line2D.draw</a>(self, renderer)

self.text.draw(renderer)

# Fixing random state for reproducibility

<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.seed.html#numpy.random.seed" title="View documentation for numpy.random.seed">np.random.seed</a>(19680801)

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

x, y = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.rand.html#numpy.random.rand" title="View documentation for numpy.random.rand">np.random.rand</a>(2, 20)

line = MyLine(x, y, mfc='red', ms=12, label='line label')

#line.text.set_text('line label')

line.text.set_color('red')

line.text.set_fontsize(16)

ax.add_line(line)

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

</pre></div>

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

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

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

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