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<div class="section" id="long-chain-of-connections-using-sankey">
<span id="sphx-glr-gallery-api-sankey-links-py"></span><h1>Long chain of connections using Sankey<a class="headerlink" href="#long-chain-of-connections-using-sankey" title="Permalink to this headline">¶</a></h1>
<p>Demonstrate/test the Sankey class by producing a long chain of connections.</p>
<img alt="../../_images/sphx_glr_sankey_links_001.png" class="align-center" src="../../_images/sphx_glr_sankey_links_001.png" />
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">cycle</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">from</span> <span class="nn">matplotlib.sankey</span> <span class="kn">import</span> <a href="../../api/sankey_api.html#matplotlib.sankey.Sankey" title="View documentation for matplotlib.sankey.Sankey"><span class="n">Sankey</span></a>
<span class="n">links_per_side</span> <span class="o">=</span> <span class="mi">6</span>
<span class="k">def</span> <span class="nf">side</span><span class="p">(</span><span class="n">sankey</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="sd">"""Generate a side chain."""</span>
<span class="n">prior</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">sankey</span><span class="o">.</span><span class="n">diagrams</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">*</span><span class="n">n</span><span class="p">,</span> <span class="mi">2</span><span class="p">):</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span>
<span class="n">patchlabel</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="n">prior</span> <span class="o">+</span> <span class="n">i</span><span class="p">),</span>
<span class="n">prior</span><span class="o">=</span><span class="n">prior</span> <span class="o">+</span> <span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">,</span> <span class="n">connect</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span>
<span class="n">patchlabel</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="n">prior</span> <span class="o">+</span> <span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">),</span>
<span class="n">prior</span><span class="o">=</span><span class="n">prior</span> <span class="o">+</span> <span class="n">i</span><span class="p">,</span> <span class="n">connect</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">corner</span><span class="p">(</span><span class="n">sankey</span><span class="p">):</span>
<span class="sd">"""Generate a corner link."""</span>
<span class="n">prior</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">sankey</span><span class="o">.</span><span class="n">diagrams</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span>
<span class="n">patchlabel</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="n">prior</span><span class="p">),</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">'k'</span><span class="p">,</span>
<span class="n">prior</span><span class="o">=</span><span class="n">prior</span> <span class="o">-</span> <span class="mi">1</span><span class="p">,</span> <span class="n">connect</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">fig</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.figure.html#matplotlib.pyplot.figure" title="View documentation for matplotlib.pyplot.figure"><span class="n">plt</span><span class="o">.</span><span class="n">figure</span></a><span class="p">()</span>
<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">xticks</span><span class="o">=</span><span class="p">[],</span> <span class="n">yticks</span><span class="o">=</span><span class="p">[],</span>
<span class="n">title</span><span class="o">=</span><span class="s2">"Why would you want to do this?</span><span class="se">\n</span><span class="s2">(But you could.)"</span><span class="p">)</span>
<span class="n">sankey</span> <span class="o">=</span> <a href="../../api/sankey_api.html#matplotlib.sankey.Sankey" title="View documentation for matplotlib.sankey.Sankey"><span class="n">Sankey</span></a><span class="p">(</span><span class="n">ax</span><span class="o">=</span><span class="n">ax</span><span class="p">,</span> <span class="n">unit</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span>
<span class="n">patchlabel</span><span class="o">=</span><span class="s2">"0"</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">'k'</span><span class="p">,</span>
<span class="n">rotation</span><span class="o">=</span><span class="mi">45</span><span class="p">)</span>
<span class="n">side</span><span class="p">(</span><span class="n">sankey</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="n">links_per_side</span><span class="p">)</span>
<span class="n">corner</span><span class="p">(</span><span class="n">sankey</span><span class="p">)</span>
<span class="n">side</span><span class="p">(</span><span class="n">sankey</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="n">links_per_side</span><span class="p">)</span>
<span class="n">corner</span><span class="p">(</span><span class="n">sankey</span><span class="p">)</span>
<span class="n">side</span><span class="p">(</span><span class="n">sankey</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="n">links_per_side</span><span class="p">)</span>
<span class="n">corner</span><span class="p">(</span><span class="n">sankey</span><span class="p">)</span>
<span class="n">side</span><span class="p">(</span><span class="n">sankey</span><span class="p">,</span> <span class="n">n</span><span class="o">=</span><span class="n">links_per_side</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">finish</span><span class="p">()</span>
<span class="c1"># Notice:</span>
<span class="c1"># 1. The alignment doesn't drift significantly (if at all; with 16007</span>
<span class="c1"># subdiagrams there is still closure).</span>
<span class="c1"># 2. The first diagram is rotated 45 deg, so all other diagrams are rotated</span>
<span class="c1"># accordingly.</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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