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<h1>Source code for matplotlib.tri.triplot</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">matplotlib.tri.triangulation</span> <span class="kn">import</span> <span class="n">Triangulation</span>
<span class="k">def</span> <span class="nf">triplot</span><span class="p">(</span><span class="n">ax</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="sd">"""</span>
<span class="sd"> Draw a unstructured triangular grid as lines and/or markers.</span>
<span class="sd"> The triangulation to plot can be specified in one of two ways; either::</span>
<span class="sd"> triplot(triangulation, ...)</span>
<span class="sd"> where triangulation is a `.Triangulation` object, or</span>
<span class="sd"> ::</span>
<span class="sd"> triplot(x, y, ...)</span>
<span class="sd"> triplot(x, y, triangles, ...)</span>
<span class="sd"> triplot(x, y, triangles=triangles, ...)</span>
<span class="sd"> triplot(x, y, mask=mask, ...)</span>
<span class="sd"> triplot(x, y, triangles, mask=mask, ...)</span>
<span class="sd"> in which case a Triangulation object will be created. See `.Triangulation`</span>
<span class="sd"> for a explanation of these possibilities.</span>
<span class="sd"> The remaining args and kwargs are the same as for `~.Axes.plot`.</span>
<span class="sd"> Returns</span>
<span class="sd"> -------</span>
<span class="sd"> lines : `~matplotlib.lines.Line2D`</span>
<span class="sd"> The drawn triangles edges.</span>
<span class="sd"> markers : `~matplotlib.lines.Line2D`</span>
<span class="sd"> The drawn marker nodes.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">matplotlib.axes</span>
<span class="n">tri</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span> <span class="o">=</span> <span class="n">Triangulation</span><span class="o">.</span><span class="n">get_from_args_and_kwargs</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="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="n">edges</span> <span class="o">=</span> <span class="p">(</span><span class="n">tri</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">tri</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">tri</span><span class="o">.</span><span class="n">edges</span><span class="p">)</span>
<span class="c1"># Decode plot format string, e.g., 'ro-'</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="k">if</span> <span class="n">args</span> <span class="k">else</span> <span class="s2">""</span>
<span class="n">linestyle</span><span class="p">,</span> <span class="n">marker</span><span class="p">,</span> <span class="n">color</span> <span class="o">=</span> <span class="n">matplotlib</span><span class="o">.</span><span class="n">axes</span><span class="o">.</span><span class="n">_base</span><span class="o">.</span><span class="n">_process_plot_format</span><span class="p">(</span><span class="n">fmt</span><span class="p">)</span>
<span class="c1"># Insert plot format string into a copy of kwargs (kwargs values prevail).</span>
<span class="n">kw</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">val</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">((</span><span class="s1">'linestyle'</span><span class="p">,</span> <span class="s1">'marker'</span><span class="p">,</span> <span class="s1">'color'</span><span class="p">),</span>
<span class="p">(</span><span class="n">linestyle</span><span class="p">,</span> <span class="n">marker</span><span class="p">,</span> <span class="n">color</span><span class="p">)):</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">kw</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">val</span><span class="p">)</span>
<span class="c1"># Draw lines without markers.</span>
<span class="c1"># Note 1: If we drew markers here, most markers would be drawn more than</span>
<span class="c1"># once as they belong to several edges.</span>
<span class="c1"># Note 2: We insert nan values in the flattened edges arrays rather than</span>
<span class="c1"># plotting directly (triang.x[edges].T, triang.y[edges].T)</span>
<span class="c1"># as it considerably speeds-up code execution.</span>
<span class="n">linestyle</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'linestyle'</span><span class="p">]</span>
<span class="n">kw_lines</span> <span class="o">=</span> <span class="p">{</span>
<span class="o">**</span><span class="n">kw</span><span class="p">,</span>
<span class="s1">'marker'</span><span class="p">:</span> <span class="s1">'None'</span><span class="p">,</span> <span class="c1"># No marker to draw.</span>
<span class="s1">'zorder'</span><span class="p">:</span> <span class="n">kw</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'zorder'</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="c1"># Path default zorder is used.</span>
<span class="p">}</span>
<span class="k">if</span> <span class="n">linestyle</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="s1">'None'</span><span class="p">,</span> <span class="s1">''</span><span class="p">,</span> <span class="s1">' '</span><span class="p">]:</span>
<span class="n">tri_lines_x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="n">x</span><span class="p">[</span><span class="n">edges</span><span class="p">],</span> <span class="mi">2</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">nan</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">tri_lines_y</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="n">y</span><span class="p">[</span><span class="n">edges</span><span class="p">],</span> <span class="mi">2</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">nan</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">tri_lines</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">tri_lines_x</span><span class="o">.</span><span class="n">ravel</span><span class="p">(),</span> <span class="n">tri_lines_y</span><span class="o">.</span><span class="n">ravel</span><span class="p">(),</span>
<span class="o">**</span><span class="n">kw_lines</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">tri_lines</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">([],</span> <span class="p">[],</span> <span class="o">**</span><span class="n">kw_lines</span><span class="p">)</span>
<span class="c1"># Draw markers separately.</span>
<span class="n">marker</span> <span class="o">=</span> <span class="n">kw</span><span class="p">[</span><span class="s1">'marker'</span><span class="p">]</span>
<span class="n">kw_markers</span> <span class="o">=</span> <span class="p">{</span>
<span class="o">**</span><span class="n">kw</span><span class="p">,</span>
<span class="s1">'linestyle'</span><span class="p">:</span> <span class="s1">'None'</span><span class="p">,</span> <span class="c1"># No line to draw.</span>
<span class="p">}</span>
<span class="k">if</span> <span class="n">marker</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="s1">'None'</span><span class="p">,</span> <span class="s1">''</span><span class="p">,</span> <span class="s1">' '</span><span class="p">]:</span>
<span class="n">tri_markers</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</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">kw_markers</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">tri_markers</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">([],</span> <span class="p">[],</span> <span class="o">**</span><span class="n">kw_markers</span><span class="p">)</span>
<span class="k">return</span> <span class="n">tri_lines</span> <span class="o">+</span> <span class="n">tri_markers</span>
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