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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>api example code: artist_demo.py — Matplotlib 1.2.1 documentation</title>
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<div class="section" id="api-example-code-artist-demo-py">
<span id="api-artist-demo"></span><h1>api example code: artist_demo.py<a class="headerlink" href="#api-example-code-artist-demo-py" title="Permalink to this headline">¶</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/api/artist_demo.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/artist_demo.png">png</a>, <a class="reference external" href="../../mpl_examples/api/artist_demo.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/api/artist_demo.pdf">pdf</a>)</p>
<div class="figure">
<img alt="../../_images/artist_demo.png" src="../../_images/artist_demo.png" />
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<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">Show examples of matplotlib artists</span>
<span class="sd">http://matplotlib.org/api/artist_api.html</span>
<span class="sd">Several examples of standard matplotlib graphics primitives (artists)</span>
<span class="sd">are drawn using matplotlib API. Full list of artists and the</span>
<span class="sd">documentation is available at</span>
<span class="sd">http://matplotlib.org/api/artist_api.html</span>
<span class="sd">Copyright (c) 2010, Bartosz Telenczuk</span>
<span class="sd">License: This work is licensed under the BSD. A copy should be</span>
<span class="sd">included with this source code, and is also available at</span>
<span class="sd">http://www.opensource.org/licenses/bsd-license.php</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="kn">import</span> <span class="nn">matplotlib</span>
<span class="kn">from</span> <span class="nn">matplotlib.collections</span> <span class="kn">import</span> <span class="n">PatchCollection</span>
<span class="kn">import</span> <span class="nn">matplotlib.path</span> <span class="kn">as</span> <span class="nn">mpath</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">import</span> <span class="nn">matplotlib.lines</span> <span class="kn">as</span> <span class="nn">mlines</span>
<span class="n">font</span> <span class="o">=</span> <span class="s">"sans-serif"</span>
<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span><span class="mi">5</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">axes</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="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">])</span>
<span class="c"># create 3x3 grid to plot the artists</span>
<span class="n">pos</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">mgrid</span><span class="p">[</span><span class="mf">0.2</span><span class="p">:</span><span class="mf">0.8</span><span class="p">:</span><span class="mi">3j</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">:</span><span class="mf">0.8</span><span class="p">:</span><span class="mi">3j</span><span class="p">]</span><span class="o">.</span><span class="n">reshape</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span>
<span class="n">patches</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c"># add a circle</span>
<span class="n">art</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">Circle</span><span class="p">(</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">0</span><span class="p">],</span> <span class="mf">0.1</span><span class="p">,</span><span class="n">ec</span><span class="o">=</span><span class="s">"none"</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">art</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</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="n">pos</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="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Circle"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a rectangle</span>
<span class="n">art</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">Rectangle</span><span class="p">(</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">1</span><span class="p">]</span> <span class="o">-</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">0.025</span><span class="p">,</span> <span class="mf">0.05</span><span class="p">]),</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span>
<span class="n">ec</span><span class="o">=</span><span class="s">"none"</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">art</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</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">pos</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="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Rectangle"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a wedge</span>
<span class="n">wedge</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">Wedge</span><span class="p">(</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">2</span><span class="p">],</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mi">30</span><span class="p">,</span> <span class="mi">270</span><span class="p">,</span> <span class="n">ec</span><span class="o">=</span><span class="s">"none"</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">wedge</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Wedge"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a Polygon</span>
<span class="n">polygon</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">RegularPolygon</span><span class="p">(</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">3</span><span class="p">],</span> <span class="mi">5</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">polygon</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</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="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Polygon"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c">#add an ellipse</span>
<span class="n">ellipse</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">Ellipse</span><span class="p">(</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">4</span><span class="p">],</span> <span class="mf">0.2</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ellipse</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">4</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">4</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Ellipse"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c">#add an arrow</span>
<span class="n">arrow</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">Arrow</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">]</span><span class="o">-</span><span class="mf">0.05</span><span class="p">,</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">5</span><span class="p">]</span><span class="o">-</span><span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">arrow</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">5</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Arrow"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a path patch</span>
<span class="n">Path</span> <span class="o">=</span> <span class="n">mpath</span><span class="o">.</span><span class="n">Path</span>
<span class="n">verts</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span>
<span class="p">(</span><span class="mf">0.158</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.257</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.035</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.11</span><span class="p">),</span>
<span class="p">(</span><span class="o">-</span><span class="mf">0.175</span><span class="p">,</span> <span class="mf">0.20</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.0375</span><span class="p">,</span> <span class="mf">0.20</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.085</span><span class="p">,</span> <span class="mf">0.115</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.22</span><span class="p">,</span> <span class="mf">0.32</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.3</span><span class="p">,</span> <span class="mf">0.005</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.20</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.05</span><span class="p">),</span>
<span class="p">(</span><span class="mf">0.158</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.257</span><span class="p">),</span>
<span class="p">])</span>
<span class="n">verts</span> <span class="o">=</span> <span class="n">verts</span><span class="o">-</span><span class="n">verts</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">codes</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="n">Path</span><span class="o">.</span><span class="n">CURVE4</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">Path</span><span class="o">.</span><span class="n">CURVE4</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">Path</span><span class="o">.</span><span class="n">CURVE4</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">Path</span><span class="o">.</span><span class="n">CURVE4</span><span class="p">,</span> <span class="n">Path</span><span class="o">.</span><span class="n">CLOSEPOLY</span><span class="p">]</span>
<span class="n">path</span> <span class="o">=</span> <span class="n">mpath</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="mf">2.5</span><span class="o">+</span><span class="n">pos</span><span class="p">[:,</span><span class="mi">6</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="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">patch</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">6</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">6</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"PathPatch"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a fancy box</span>
<span class="n">fancybox</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">FancyBboxPatch</span><span class="p">(</span>
<span class="n">pos</span><span class="p">[:,</span><span class="mi">7</span><span class="p">]</span><span class="o">-</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">0.025</span><span class="p">,</span> <span class="mf">0.05</span><span class="p">]),</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span>
<span class="n">boxstyle</span><span class="o">=</span><span class="n">mpatches</span><span class="o">.</span><span class="n">BoxStyle</span><span class="p">(</span><span class="s">"Round"</span><span class="p">,</span> <span class="n">pad</span><span class="o">=</span><span class="mf">0.02</span><span class="p">))</span>
<span class="n">patches</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">fancybox</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">7</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">7</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"FancyBoxPatch"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="c"># add a line</span>
<span class="n">x</span><span class="p">,</span><span class="n">y</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([[</span><span class="o">-</span><span class="mf">0.06</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">],</span> <span class="p">[</span><span class="mf">0.05</span><span class="p">,</span><span class="o">-</span><span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.05</span><span class="p">]])</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">mlines</span><span class="o">.</span><span class="n">Line2D</span><span class="p">(</span><span class="n">x</span><span class="o">+</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">8</span><span class="p">],</span> <span class="n">y</span><span class="o">+</span><span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">8</span><span class="p">],</span> <span class="n">lw</span><span class="o">=</span><span class="mf">5.</span><span class="p">,</span>
<span class="n">alpha</span><span class="o">=</span><span class="mf">0.4</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">pos</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">8</span><span class="p">],</span> <span class="n">pos</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">8</span><span class="p">]</span><span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="s">"Line2D"</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">family</span><span class="o">=</span><span class="n">font</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="mi">14</span><span class="p">)</span>
<span class="n">colors</span> <span class="o">=</span> <span class="mi">100</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">rand</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">patches</span><span class="p">))</span>
<span class="n">collection</span> <span class="o">=</span> <span class="n">PatchCollection</span><span class="p">(</span><span class="n">patches</span><span class="p">,</span> <span class="n">cmap</span><span class="o">=</span><span class="n">matplotlib</span><span class="o">.</span><span class="n">cm</span><span class="o">.</span><span class="n">jet</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.4</span><span class="p">)</span>
<span class="n">collection</span><span class="o">.</span><span class="n">set_array</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">colors</span><span class="p">))</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_collection</span><span class="p">(</span><span class="n">collection</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>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xticks</span><span class="p">([])</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_yticks</span><span class="p">([])</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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