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<div class="section" id="api-example-code-sankey-demo-py">
<span id="api-sankey-demo"></span><h1>api example code: sankey_demo.py<a class="headerlink" href="#api-example-code-sankey-demo-py" title="Permalink to this headline">¶</a></h1>
[<a class="reference external" href="../../plot_directive/mpl_examples/api/sankey_demo.py">source code</a>]<p>Exception occurred rendering plot.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="n">__author__</span> <span class="o">=</span> <span class="s">"Yannick Copin <ycopin@ipnl.in2p3.fr>"</span>
<span class="n">__version__</span> <span class="o">=</span> <span class="s">"Time-stamp: <10/02/2010 16:49 ycopin@lyopc548.in2p3.fr>"</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">N</span>
<span class="k">def</span> <span class="nf">sankey</span><span class="p">(</span><span class="n">ax</span><span class="p">,</span>
<span class="n">outputs</span><span class="o">=</span><span class="p">[</span><span class="mf">100.</span><span class="p">],</span> <span class="n">outlabels</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span>
<span class="n">inputs</span><span class="o">=</span><span class="p">[</span><span class="mf">100.</span><span class="p">],</span> <span class="n">inlabels</span><span class="o">=</span><span class="s">''</span><span class="p">,</span>
<span class="n">dx</span><span class="o">=</span><span class="mi">40</span><span class="p">,</span> <span class="n">dy</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span> <span class="n">outangle</span><span class="o">=</span><span class="mi">45</span><span class="p">,</span> <span class="n">w</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">inangle</span><span class="o">=</span><span class="mi">30</span><span class="p">,</span> <span class="n">offset</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""Draw a Sankey diagram.</span>
<span class="sd"> outputs: array of outputs, should sum up to 100%</span>
<span class="sd"> outlabels: output labels (same length as outputs),</span>
<span class="sd"> or None (use default labels) or '' (no labels)</span>
<span class="sd"> inputs and inlabels: similar for inputs</span>
<span class="sd"> dx: horizontal elongation</span>
<span class="sd"> dy: vertical elongation</span>
<span class="sd"> outangle: output arrow angle [deg]</span>
<span class="sd"> w: output arrow shoulder</span>
<span class="sd"> inangle: input dip angle</span>
<span class="sd"> offset: text offset</span>
<span class="sd"> **kwargs: propagated to Patch (e.g. fill=False)</span>
<span class="sd"> Return (patch,[intexts,outtexts])."""</span>
<span class="kn">import</span> <span class="nn">matplotlib.patches</span> <span class="kn">as</span> <span class="nn">mpatches</span>
<span class="kn">from</span> <span class="nn">matplotlib.path</span> <span class="kn">import</span> <span class="n">Path</span>
<span class="n">outs</span> <span class="o">=</span> <span class="n">N</span><span class="o">.</span><span class="n">absolute</span><span class="p">(</span><span class="n">outputs</span><span class="p">)</span>
<span class="n">outsigns</span> <span class="o">=</span> <span class="n">N</span><span class="o">.</span><span class="n">sign</span><span class="p">(</span><span class="n">outputs</span><span class="p">)</span>
<span class="n">outsigns</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">0</span> <span class="c"># Last output</span>
<span class="n">ins</span> <span class="o">=</span> <span class="n">N</span><span class="o">.</span><span class="n">absolute</span><span class="p">(</span><span class="n">inputs</span><span class="p">)</span>
<span class="n">insigns</span> <span class="o">=</span> <span class="n">N</span><span class="o">.</span><span class="n">sign</span><span class="p">(</span><span class="n">inputs</span><span class="p">)</span>
<span class="n">insigns</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span> <span class="c"># First input</span>
<span class="k">assert</span> <span class="nb">sum</span><span class="p">(</span><span class="n">outs</span><span class="p">)</span><span class="o">==</span><span class="mi">100</span><span class="p">,</span> <span class="s">"Outputs don't sum up to 100%"</span>
<span class="k">assert</span> <span class="nb">sum</span><span class="p">(</span><span class="n">ins</span><span class="p">)</span><span class="o">==</span><span class="mi">100</span><span class="p">,</span> <span class="s">"Inputs don't sum up to 100%"</span>
<span class="k">def</span> <span class="nf">add_output</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">loss</span><span class="p">,</span> <span class="n">sign</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="n">h</span> <span class="o">=</span> <span class="p">(</span><span class="n">loss</span><span class="o">/</span><span class="mi">2</span><span class="o">+</span><span class="n">w</span><span class="p">)</span><span class="o">*</span><span class="n">N</span><span class="o">.</span><span class="n">tan</span><span class="p">(</span><span class="n">outangle</span><span class="o">/</span><span class="mf">180.</span><span class="o">*</span><span class="n">N</span><span class="o">.</span><span class="n">pi</span><span class="p">)</span> <span class="c"># Arrow tip height</span>
<span class="n">move</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="o">=</span> <span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="c"># Use last point as reference</span>
<span class="k">if</span> <span class="n">sign</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span> <span class="c"># Final loss (horizontal)</span>
<span class="n">path</span><span class="o">.</span><span class="n">extend</span><span class="p">([(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">w</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">+</span><span class="n">h</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">loss</span><span class="o">/</span><span class="mi">2</span><span class="p">]),</span> <span class="c"># Tip</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">loss</span><span class="o">-</span><span class="n">w</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">loss</span><span class="p">])])</span>
<span class="n">outtips</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sign</span><span class="p">,</span><span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">3</span><span class="p">][</span><span class="mi">1</span><span class="p">]))</span>
<span class="k">else</span><span class="p">:</span> <span class="c"># Intermediate loss (vertical)</span>
<span class="n">path</span><span class="o">.</span><span class="n">extend</span><span class="p">([(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">-</span><span class="n">w</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">+</span><span class="n">loss</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="p">(</span><span class="n">dy</span><span class="o">+</span><span class="n">h</span><span class="p">)]),</span> <span class="c"># Tip</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">+</span><span class="n">loss</span><span class="o">+</span><span class="n">w</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">+</span><span class="n">loss</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE3</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">+</span><span class="n">loss</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">sign</span><span class="o">*</span><span class="n">loss</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE3</span><span class="p">,[</span><span class="n">x</span><span class="o">+</span><span class="n">dx</span><span class="o">/</span><span class="mi">2</span><span class="o">+</span><span class="n">loss</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">sign</span><span class="o">*</span><span class="n">loss</span><span class="p">])])</span>
<span class="n">outtips</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sign</span><span class="p">,</span><span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">5</span><span class="p">][</span><span class="mi">1</span><span class="p">]))</span>
<span class="k">def</span> <span class="nf">add_input</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">gain</span><span class="p">,</span> <span class="n">sign</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="n">h</span> <span class="o">=</span> <span class="p">(</span><span class="n">gain</span><span class="o">/</span><span class="mi">2</span><span class="p">)</span><span class="o">*</span><span class="n">N</span><span class="o">.</span><span class="n">tan</span><span class="p">(</span><span class="n">inangle</span><span class="o">/</span><span class="mf">180.</span><span class="o">*</span><span class="n">N</span><span class="o">.</span><span class="n">pi</span><span class="p">)</span> <span class="c"># Dip depth</span>
<span class="n">move</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="o">=</span> <span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="c"># Use last point as reference</span>
<span class="k">if</span> <span class="n">sign</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span> <span class="c"># First gain (horizontal)</span>
<span class="n">path</span><span class="o">.</span><span class="n">extend</span><span class="p">([(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">+</span><span class="n">h</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">gain</span><span class="o">/</span><span class="mi">2</span><span class="p">]),</span> <span class="c"># Dip</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">gain</span><span class="p">])])</span>
<span class="n">xd</span><span class="p">,</span><span class="n">yd</span> <span class="o">=</span> <span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">2</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span> <span class="c"># Dip position</span>
<span class="n">indips</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sign</span><span class="p">,[</span><span class="n">xd</span><span class="o">-</span><span class="n">h</span><span class="p">,</span><span class="n">yd</span><span class="p">]))</span>
<span class="k">else</span><span class="p">:</span> <span class="c"># Intermediate gain (vertical)</span>
<span class="n">path</span><span class="o">.</span><span class="n">extend</span><span class="p">([(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">-</span><span class="n">gain</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="p">(</span><span class="n">dy</span><span class="o">-</span><span class="n">h</span><span class="p">)]),</span> <span class="c"># Dip</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">-</span><span class="n">gain</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">dy</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE3</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">-</span><span class="n">gain</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">sign</span><span class="o">*</span><span class="n">gain</span><span class="p">]),</span>
<span class="p">(</span><span class="n">Path</span><span class="o">.</span><span class="n">CURVE3</span><span class="p">,[</span><span class="n">x</span><span class="o">-</span><span class="n">dx</span><span class="o">/</span><span class="mi">2</span><span class="o">-</span><span class="n">gain</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">sign</span><span class="o">*</span><span class="n">gain</span><span class="p">])])</span>
<span class="n">xd</span><span class="p">,</span><span class="n">yd</span> <span class="o">=</span> <span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">4</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span> <span class="c"># Dip position</span>
<span class="n">indips</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">sign</span><span class="p">,[</span><span class="n">xd</span><span class="p">,</span><span class="n">yd</span><span class="o">+</span><span class="n">sign</span><span class="o">*</span><span class="n">h</span><span class="p">]))</span>
<span class="n">outtips</span> <span class="o">=</span> <span class="p">[]</span> <span class="c"># Output arrow tip dir. and positions</span>
<span class="n">urpath</span> <span class="o">=</span> <span class="p">[(</span><span class="n">Path</span><span class="o">.</span><span class="n">MOVETO</span><span class="p">,[</span><span class="mi">0</span><span class="p">,</span><span class="mi">100</span><span class="p">])]</span> <span class="c"># 1st point of upper right path</span>
<span class="n">lrpath</span> <span class="o">=</span> <span class="p">[(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">])]</span> <span class="c"># 1st point of lower right path</span>
<span class="k">for</span> <span class="n">loss</span><span class="p">,</span><span class="n">sign</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">outs</span><span class="p">,</span><span class="n">outsigns</span><span class="p">):</span>
<span class="n">add_output</span><span class="p">(</span><span class="n">sign</span><span class="o">>=</span><span class="mi">0</span> <span class="ow">and</span> <span class="n">urpath</span> <span class="ow">or</span> <span class="n">lrpath</span><span class="p">,</span> <span class="n">loss</span><span class="p">,</span> <span class="n">sign</span><span class="o">=</span><span class="n">sign</span><span class="p">)</span>
<span class="n">indips</span> <span class="o">=</span> <span class="p">[]</span> <span class="c"># Input arrow tip dir. and positions</span>
<span class="n">llpath</span> <span class="o">=</span> <span class="p">[(</span><span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span><span class="p">,[</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">])]</span> <span class="c"># 1st point of lower left path</span>
<span class="n">ulpath</span> <span class="o">=</span> <span class="p">[(</span><span class="n">Path</span><span class="o">.</span><span class="n">MOVETO</span><span class="p">,[</span><span class="mi">0</span><span class="p">,</span><span class="mi">100</span><span class="p">])]</span> <span class="c"># 1st point of upper left path</span>
<span class="k">for</span> <span class="n">gain</span><span class="p">,</span><span class="n">sign</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">ins</span><span class="p">,</span><span class="n">insigns</span><span class="p">)[::</span><span class="o">-</span><span class="mi">1</span><span class="p">]:</span>
<span class="n">add_input</span><span class="p">(</span><span class="n">sign</span><span class="o"><=</span><span class="mi">0</span> <span class="ow">and</span> <span class="n">llpath</span> <span class="ow">or</span> <span class="n">ulpath</span><span class="p">,</span> <span class="n">gain</span><span class="p">,</span> <span class="n">sign</span><span class="o">=</span><span class="n">sign</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">revert</span><span class="p">(</span><span class="n">path</span><span class="p">):</span>
<span class="sd">"""A path is not just revertable by path[::-1] because of Bezier</span>
<span class="sd"> curves."""</span>
<span class="n">rpath</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">nextmove</span> <span class="o">=</span> <span class="n">Path</span><span class="o">.</span><span class="n">LINETO</span>
<span class="k">for</span> <span class="n">move</span><span class="p">,</span><span class="n">pos</span> <span class="ow">in</span> <span class="n">path</span><span class="p">[::</span><span class="o">-</span><span class="mi">1</span><span class="p">]:</span>
<span class="n">rpath</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">nextmove</span><span class="p">,</span><span class="n">pos</span><span class="p">))</span>
<span class="n">nextmove</span> <span class="o">=</span> <span class="n">move</span>
<span class="k">return</span> <span class="n">rpath</span>
<span class="c"># Concatenate subpathes in correct order</span>
<span class="n">path</span> <span class="o">=</span> <span class="n">urpath</span> <span class="o">+</span> <span class="n">revert</span><span class="p">(</span><span class="n">lrpath</span><span class="p">)</span> <span class="o">+</span> <span class="n">llpath</span> <span class="o">+</span> <span class="n">revert</span><span class="p">(</span><span class="n">ulpath</span><span class="p">)</span>
<span class="n">codes</span><span class="p">,</span><span class="n">verts</span> <span class="o">=</span> <span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="n">path</span><span class="p">)</span>
<span class="n">verts</span> <span class="o">=</span> <span class="n">N</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">verts</span><span class="p">)</span>
<span class="c"># Path patch</span>
<span class="n">path</span> <span class="o">=</span> <span class="n">Path</span><span class="p">(</span><span class="n">verts</span><span class="p">,</span><span class="n">codes</span><span class="p">)</span>
<span class="n">patch</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">PathPatch</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_patch</span><span class="p">(</span><span class="n">patch</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">False</span><span class="p">:</span> <span class="c"># DEBUG</span>
<span class="k">print</span> <span class="s">"urpath"</span><span class="p">,</span> <span class="n">urpath</span>
<span class="k">print</span> <span class="s">"lrpath"</span><span class="p">,</span> <span class="n">revert</span><span class="p">(</span><span class="n">lrpath</span><span class="p">)</span>
<span class="k">print</span> <span class="s">"llpath"</span><span class="p">,</span> <span class="n">llpath</span>
<span class="k">print</span> <span class="s">"ulpath"</span><span class="p">,</span> <span class="n">revert</span><span class="p">(</span><span class="n">ulpath</span><span class="p">)</span>
<span class="n">xs</span><span class="p">,</span><span class="n">ys</span> <span class="o">=</span> <span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="n">verts</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">xs</span><span class="p">,</span><span class="n">ys</span><span class="p">,</span><span class="s">'go-'</span><span class="p">)</span>
<span class="c"># Labels</span>
<span class="k">def</span> <span class="nf">set_labels</span><span class="p">(</span><span class="n">labels</span><span class="p">,</span><span class="n">values</span><span class="p">):</span>
<span class="sd">"""Set or check labels according to values."""</span>
<span class="k">if</span> <span class="n">labels</span><span class="o">==</span><span class="s">''</span><span class="p">:</span> <span class="c"># No labels</span>
<span class="k">return</span> <span class="n">labels</span>
<span class="k">elif</span> <span class="n">labels</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> <span class="c"># Default labels</span>
<span class="k">return</span> <span class="p">[</span> <span class="s">'</span><span class="si">%2d%%</span><span class="s">'</span> <span class="o">%</span> <span class="n">val</span> <span class="k">for</span> <span class="n">val</span> <span class="ow">in</span> <span class="n">values</span> <span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">labels</span><span class="p">)</span><span class="o">==</span><span class="nb">len</span><span class="p">(</span><span class="n">values</span><span class="p">)</span>
<span class="k">return</span> <span class="n">labels</span>
<span class="k">def</span> <span class="nf">put_labels</span><span class="p">(</span><span class="n">labels</span><span class="p">,</span><span class="n">positions</span><span class="p">,</span><span class="n">output</span><span class="o">=</span><span class="bp">True</span><span class="p">):</span>
<span class="sd">"""Put labels to positions."""</span>
<span class="n">texts</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">lbls</span> <span class="o">=</span> <span class="n">output</span> <span class="ow">and</span> <span class="n">labels</span> <span class="ow">or</span> <span class="n">labels</span><span class="p">[::</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span><span class="n">label</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">lbls</span><span class="p">):</span>
<span class="n">s</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="o">=</span> <span class="n">positions</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="c"># Label direction and position</span>
<span class="k">if</span> <span class="n">s</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">x</span><span class="o">+</span><span class="n">offset</span><span class="p">,</span><span class="n">y</span><span class="p">,</span><span class="n">label</span><span class="p">,</span>
<span class="n">ha</span><span class="o">=</span><span class="n">output</span> <span class="ow">and</span> <span class="s">'left'</span> <span class="ow">or</span> <span class="s">'right'</span><span class="p">,</span> <span class="n">va</span><span class="o">=</span><span class="s">'center'</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">s</span><span class="o">></span><span class="mi">0</span><span class="p">:</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="o">+</span><span class="n">offset</span><span class="p">,</span><span class="n">label</span><span class="p">,</span> <span class="n">ha</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">va</span><span class="o">=</span><span class="s">'bottom'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="o">-</span><span class="n">offset</span><span class="p">,</span><span class="n">label</span><span class="p">,</span> <span class="n">ha</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">va</span><span class="o">=</span><span class="s">'top'</span><span class="p">)</span>
<span class="n">texts</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="k">return</span> <span class="n">texts</span>
<span class="n">outlabels</span> <span class="o">=</span> <span class="n">set_labels</span><span class="p">(</span><span class="n">outlabels</span><span class="p">,</span> <span class="n">outs</span><span class="p">)</span>
<span class="n">outtexts</span> <span class="o">=</span> <span class="n">put_labels</span><span class="p">(</span><span class="n">outlabels</span><span class="p">,</span> <span class="n">outtips</span><span class="p">,</span> <span class="n">output</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">inlabels</span> <span class="o">=</span> <span class="n">set_labels</span><span class="p">(</span><span class="n">inlabels</span><span class="p">,</span> <span class="n">ins</span><span class="p">)</span>
<span class="n">intexts</span> <span class="o">=</span> <span class="n">put_labels</span><span class="p">(</span><span class="n">inlabels</span><span class="p">,</span> <span class="n">indips</span><span class="p">,</span> <span class="n">output</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="c"># Axes management</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="n">verts</span><span class="p">[:,</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">min</span><span class="p">()</span><span class="o">-</span><span class="n">dx</span><span class="p">,</span> <span class="n">verts</span><span class="p">[:,</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">max</span><span class="p">()</span><span class="o">+</span><span class="n">dx</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span><span class="n">verts</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">min</span><span class="p">()</span><span class="o">-</span><span class="n">dy</span><span class="p">,</span> <span class="n">verts</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">max</span><span class="p">()</span><span class="o">+</span><span class="n">dy</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_aspect</span><span class="p">(</span><span class="s">'equal'</span><span class="p">,</span> <span class="n">adjustable</span><span class="o">=</span><span class="s">'datalim'</span><span class="p">)</span>
<span class="k">return</span> <span class="n">patch</span><span class="p">,[</span><span class="n">intexts</span><span class="p">,</span><span class="n">outtexts</span><span class="p">]</span>
<span class="k">if</span> <span class="n">__name__</span><span class="o">==</span><span class="s">'__main__'</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">P</span>
<span class="n">outputs</span> <span class="o">=</span> <span class="p">[</span><span class="mf">10.</span><span class="p">,</span><span class="o">-</span><span class="mf">20.</span><span class="p">,</span><span class="mf">5.</span><span class="p">,</span><span class="mf">15.</span><span class="p">,</span><span class="o">-</span><span class="mf">10.</span><span class="p">,</span><span class="mf">40.</span><span class="p">]</span>
<span class="n">outlabels</span> <span class="o">=</span> <span class="p">[</span><span class="s">'First'</span><span class="p">,</span><span class="s">'Second'</span><span class="p">,</span><span class="s">'Third'</span><span class="p">,</span><span class="s">'Fourth'</span><span class="p">,</span><span class="s">'Fifth'</span><span class="p">,</span><span class="s">'Hurray!'</span><span class="p">]</span>
<span class="n">outlabels</span> <span class="o">=</span> <span class="p">[</span> <span class="n">s</span><span class="o">+</span><span class="s">'</span><span class="se">\n</span><span class="si">%d%%</span><span class="s">'</span> <span class="o">%</span> <span class="nb">abs</span><span class="p">(</span><span class="n">l</span><span class="p">)</span> <span class="k">for</span> <span class="n">l</span><span class="p">,</span><span class="n">s</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">outputs</span><span class="p">,</span><span class="n">outlabels</span><span class="p">)</span> <span class="p">]</span>
<span class="n">inputs</span> <span class="o">=</span> <span class="p">[</span><span class="mf">60.</span><span class="p">,</span><span class="o">-</span><span class="mf">25.</span><span class="p">,</span><span class="mf">15.</span><span class="p">]</span>
<span class="n">fig</span> <span class="o">=</span> <span class="n">P</span><span class="o">.</span><span class="n">figure</span><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="s">"Sankey diagram"</span>
<span class="p">)</span>
<span class="n">patch</span><span class="p">,(</span><span class="n">intexts</span><span class="p">,</span><span class="n">outtexts</span><span class="p">)</span> <span class="o">=</span> <span class="n">sankey</span><span class="p">(</span><span class="n">ax</span><span class="p">,</span> <span class="n">outputs</span><span class="o">=</span><span class="n">outputs</span><span class="p">,</span> <span class="n">outlabels</span><span class="o">=</span><span class="n">outlabels</span><span class="p">,</span>
<span class="n">inputs</span><span class="o">=</span><span class="n">inputs</span><span class="p">,</span> <span class="n">inlabels</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span>
<span class="n">fc</span><span class="o">=</span><span class="s">'g'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.2</span><span class="p">)</span>
<span class="n">outtexts</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s">'r'</span><span class="p">)</span>
<span class="n">outtexts</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">set_fontweight</span><span class="p">(</span><span class="s">'bold'</span><span class="p">)</span>
<span class="n">P</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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