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<div class="section" id="artist-within-an-artist">
<span id="sphx-glr-gallery-api-line-with-text-py"></span><h1>Artist within an artist<a class="headerlink" href="#artist-within-an-artist" title="Permalink to this headline">¶</a></h1>
<p>Show how to override basic methods so an artist can contain another
artist. In this case, the line contains a Text instance to label it.</p>
<img alt="../../_images/sphx_glr_line_with_text_001.png" class="align-center" src="../../_images/sphx_glr_line_with_text_001.png" />
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="kn">import</span> <span class="nn">matplotlib.lines</span> <span class="kn">as</span> <span class="nn">lines</span>
<span class="kn">import</span> <span class="nn">matplotlib.transforms</span> <span class="kn">as</span> <span class="nn">mtransforms</span>
<span class="kn">import</span> <span class="nn">matplotlib.text</span> <span class="kn">as</span> <span class="nn">mtext</span>
<span class="k">class</span> <span class="nc">MyLine</span><span class="p">(</span><a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span></a><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># we'll update the position when the line data is set</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span> <span class="o">=</span> <a href="../../api/text_api.html#matplotlib.text.Text" title="View documentation for matplotlib.text.Text"><span class="n">mtext</span><span class="o">.</span><span class="n">Text</span></a><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="s1">''</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span></a><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="c1"># we can't access the label attr until *after* the line is</span>
<span class="c1"># inited</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_text</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_label</span><span class="p">())</span>
<span class="k">def</span> <span class="nf">set_figure</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">figure</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_figure</span><span class="p">(</span><span class="n">figure</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span></a><span class="o">.</span><span class="n">set_figure</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">figure</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">set_axes</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">axes</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_axes</span><span class="p">(</span><span class="n">axes</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D" title="View documentation for matplotlib.lines.Line2D"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span></a><span class="o">.</span><span class="n">set_axes</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">axes</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">set_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">transform</span><span class="p">):</span>
<span class="c1"># 2 pixel offset</span>
<span class="n">texttrans</span> <span class="o">=</span> <span class="n">transform</span> <span class="o">+</span> <a href="../../api/transformations.html#matplotlib.transforms.Affine2D" title="View documentation for matplotlib.transforms.Affine2D"><span class="n">mtransforms</span><span class="o">.</span><span class="n">Affine2D</span></a><span class="p">()</span><span class="o">.</span><span class="n">translate</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_transform</span><span class="p">(</span><span class="n">texttrans</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_transform" title="View documentation for matplotlib.lines.Line2D.set_transform"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span><span class="o">.</span><span class="n">set_transform</span></a><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">transform</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">set_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">x</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_position</span><span class="p">((</span><span class="n">x</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">y</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]))</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.set_data" title="View documentation for matplotlib.lines.Line2D.set_data"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span><span class="o">.</span><span class="n">set_data</span></a><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">draw</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">):</span>
<span class="c1"># draw my label at the end of the line with 2 pixel offset</span>
<a href="../../api/_as_gen/matplotlib.lines.Line2D.html#matplotlib.lines.Line2D.draw" title="View documentation for matplotlib.lines.Line2D.draw"><span class="n">lines</span><span class="o">.</span><span class="n">Line2D</span><span class="o">.</span><span class="n">draw</span></a><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">renderer</span><span class="p">)</span>
<span class="c1"># Fixing random state for reproducibility</span>
<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.seed.html#numpy.random.seed" title="View documentation for numpy.random.seed"><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">seed</span></a><span class="p">(</span><span class="mi">19680801</span><span class="p">)</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots"><span class="n">plt</span><span class="o">.</span><span class="n">subplots</span></a><span class="p">()</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.random.rand.html#numpy.random.rand" title="View documentation for numpy.random.rand"><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">rand</span></a><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">20</span><span class="p">)</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">MyLine</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="n">mfc</span><span class="o">=</span><span class="s1">'red'</span><span class="p">,</span> <span class="n">ms</span><span class="o">=</span><span class="mi">12</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">'line label'</span><span class="p">)</span>
<span class="c1">#line.text.set_text('line label')</span>
<span class="n">line</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s1">'red'</span><span class="p">)</span>
<span class="n">line</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_fontsize</span><span class="p">(</span><span class="mi">16</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_line</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show"><span class="n">plt</span><span class="o">.</span><span class="n">show</span></a><span class="p">()</span>
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