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<div class="section" id="api-example-code-legend-demo-py">
<span id="api-legend-demo"></span><h1>api example code: legend_demo.py<a class="headerlink" href="#api-example-code-legend-demo-py" title="Permalink to this headline">¶</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/api/legend_demo.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/legend_demo.png">png</a>, <a class="reference external" href="../../mpl_examples/api/legend_demo.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/api/legend_demo.pdf">pdf</a>)</p>
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<img alt="../../_images/legend_demo1.png" src="../../_images/legend_demo1.png" />
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<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">Demo of the legend function with a few features.</span>
<span class="sd">In addition to the basic legend, this demo shows a few optional features:</span>
<span class="sd"> * Custom legend placement.</span>
<span class="sd"> * A keyword argument to a drop-shadow.</span>
<span class="sd"> * Setting the background color.</span>
<span class="sd"> * Setting the font size.</span>
<span class="sd"> * Setting the line width.</span>
<span class="sd">"""</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="c"># Example data</span>
<span class="n">a</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span> <span class="o">.</span><span class="mo">02</span><span class="p">)</span>
<span class="n">b</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span> <span class="o">.</span><span class="mo">02</span><span class="p">)</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">exp</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
<span class="n">d</span> <span class="o">=</span> <span class="n">c</span><span class="p">[::</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="c"># Create plots with pre-defined labels.</span>
<span class="c"># Alternatively, you can pass labels explicitly when calling `legend`.</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">()</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">c</span><span class="p">,</span> <span class="s">'k--'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">'Model length'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">d</span><span class="p">,</span> <span class="s">'k:'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">'Data length'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">c</span><span class="o">+</span><span class="n">d</span><span class="p">,</span> <span class="s">'k'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">'Total message length'</span><span class="p">)</span>
<span class="c"># Now add the legend with some customizations.</span>
<span class="n">legend</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">legend</span><span class="p">(</span><span class="n">loc</span><span class="o">=</span><span class="s">'upper center'</span><span class="p">,</span> <span class="n">shadow</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="c"># The frame is matplotlib.patches.Rectangle instance surrounding the legend.</span>
<span class="n">frame</span> <span class="o">=</span> <span class="n">legend</span><span class="o">.</span><span class="n">get_frame</span><span class="p">()</span>
<span class="n">frame</span><span class="o">.</span><span class="n">set_facecolor</span><span class="p">(</span><span class="s">'0.90'</span><span class="p">)</span>
<span class="c"># Set the fontsize</span>
<span class="k">for</span> <span class="n">label</span> <span class="ow">in</span> <span class="n">legend</span><span class="o">.</span><span class="n">get_texts</span><span class="p">():</span>
<span class="n">label</span><span class="o">.</span><span class="n">set_fontsize</span><span class="p">(</span><span class="s">'large'</span><span class="p">)</span>
<span class="k">for</span> <span class="n">label</span> <span class="ow">in</span> <span class="n">legend</span><span class="o">.</span><span class="n">get_lines</span><span class="p">():</span>
<span class="n">label</span><span class="o">.</span><span class="n">set_linewidth</span><span class="p">(</span><span class="mf">1.5</span><span class="p">)</span> <span class="c"># the legend line width</span>
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
</pre></div>
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<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p>
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