<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>event_handling example code: lasso_demo.py — Matplotlib 1.2.0 documentation</title> <link rel="stylesheet" href="../../_static/mpl.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../', VERSION: '1.2.0', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Matplotlib 1.2.0 documentation" href="../../_static/opensearch.xml"/> <link rel="top" title="Matplotlib 1.2.0 documentation" href="../../index.html" /> </head> <body> <!-- Piwik --> <script type="text/javascript"> if ("matplotlib.sourceforge.net" == document.location.hostname || "matplotlib.sf.net" == document.location.hostname) { var pkBaseURL = (("https:" == document.location.protocol) ? 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A callback is used to change the color of the</span> <span class="sd">selected points</span> <span class="sd">This is currently a proof-of-concept implementation (though it is</span> <span class="sd">usable as is). There will be some refinement of the API.</span> <span class="sd">"""</span> <span class="kn">from</span> <span class="nn">matplotlib.widgets</span> <span class="kn">import</span> <span class="n">Lasso</span> <span class="kn">from</span> <span class="nn">matplotlib.colors</span> <span class="kn">import</span> <span class="n">colorConverter</span> <span class="kn">from</span> <span class="nn">matplotlib.collections</span> <span class="kn">import</span> <span class="n">RegularPolyCollection</span> <span class="kn">from</span> <span class="nn">matplotlib</span> <span class="kn">import</span> <span class="n">path</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">numpy</span> <span class="kn">import</span> <span class="n">nonzero</span> <span class="kn">from</span> <span class="nn">numpy.random</span> <span class="kn">import</span> <span class="n">rand</span> <span class="k">class</span> <span class="nc">Datum</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="n">colorin</span> <span class="o">=</span> <span class="n">colorConverter</span><span class="o">.</span><span class="n">to_rgba</span><span class="p">(</span><span class="s">'red'</span><span class="p">)</span> <span class="n">colorout</span> <span class="o">=</span> <span class="n">colorConverter</span><span class="o">.</span><span class="n">to_rgba</span><span class="p">(</span><span class="s">'blue'</span><span class="p">)</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</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">include</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">x</span> <span class="o">=</span> <span class="n">x</span> <span class="bp">self</span><span class="o">.</span><span class="n">y</span> <span class="o">=</span> <span class="n">y</span> <span class="k">if</span> <span class="n">include</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">color</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">colorin</span> <span class="k">else</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">color</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">colorout</span> <span class="k">class</span> <span class="nc">LassoManager</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ax</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">axes</span> <span class="o">=</span> <span class="n">ax</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">figure</span><span class="o">.</span><span class="n">canvas</span> <span class="bp">self</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="n">data</span> <span class="bp">self</span><span class="o">.</span><span class="n">Nxy</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="n">facecolors</span> <span class="o">=</span> <span class="p">[</span><span class="n">d</span><span class="o">.</span><span class="n">color</span> <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="n">data</span><span class="p">]</span> <span class="bp">self</span><span class="o">.</span><span class="n">xys</span> <span class="o">=</span> <span class="p">[(</span><span class="n">d</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">d</span><span class="o">.</span><span class="n">y</span><span class="p">)</span> <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="n">data</span><span class="p">]</span> <span class="n">fig</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">figure</span> <span class="bp">self</span><span class="o">.</span><span class="n">collection</span> <span class="o">=</span> <span class="n">RegularPolyCollection</span><span class="p">(</span> <span class="n">fig</span><span class="o">.</span><span class="n">dpi</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="n">sizes</span><span class="o">=</span><span class="p">(</span><span class="mi">100</span><span class="p">,),</span> <span class="n">facecolors</span><span class="o">=</span><span class="n">facecolors</span><span class="p">,</span> <span class="n">offsets</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xys</span><span class="p">,</span> <span class="n">transOffset</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">transData</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="bp">self</span><span class="o">.</span><span class="n">collection</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">cid</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'button_press_event'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">onpress</span><span class="p">)</span> <span class="k">def</span> <span class="nf">callback</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">verts</span><span class="p">):</span> <span class="n">facecolors</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">get_facecolors</span><span class="p">()</span> <span class="n">p</span> <span class="o">=</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">ind</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">contains_points</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">xys</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="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">xys</span><span class="p">)):</span> <span class="k">if</span> <span class="n">ind</span><span class="p">[</span><span class="n">i</span><span class="p">]:</span> <span class="n">facecolors</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">Datum</span><span class="o">.</span><span class="n">colorin</span> <span class="k">else</span><span class="p">:</span> <span class="n">facecolors</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">Datum</span><span class="o">.</span><span class="n">colorout</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">draw_idle</span><span class="p">()</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">widgetlock</span><span class="o">.</span><span class="n">release</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">lasso</span><span class="p">)</span> <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">lasso</span> <span class="k">def</span> <span class="nf">onpress</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">widgetlock</span><span class="o">.</span><span class="n">locked</span><span class="p">():</span> <span class="k">return</span> <span class="k">if</span> <span class="n">event</span><span class="o">.</span><span class="n">inaxes</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">lasso</span> <span class="o">=</span> <span class="n">Lasso</span><span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">inaxes</span><span class="p">,</span> <span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">xdata</span><span class="p">,</span> <span class="n">event</span><span class="o">.</span><span class="n">ydata</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">callback</span><span class="p">)</span> <span class="c"># acquire a lock on the widget drawing</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">widgetlock</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">lasso</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="n">data</span> <span class="o">=</span> <span class="p">[</span><span class="n">Datum</span><span class="p">(</span><span class="o">*</span><span class="n">xy</span><span class="p">)</span> <span class="k">for</span> <span class="n">xy</span> <span class="ow">in</span> <span class="n">rand</span><span class="p">(</span><span class="mi">100</span><span class="p">,</span> <span class="mi">2</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="n">xlim</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">ylim</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">autoscale_on</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span> <span class="n">lman</span> <span class="o">=</span> <span class="n">LassoManager</span><span class="p">(</span><span class="n">ax</span><span class="p">,</span> <span class="n">data</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> </div> <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> </div> </div> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li><a href="../../index.html">home</a>| </li> <li><a href="../../search.html">search</a>| </li> <li><a href="../index.html">examples</a>| </li> <li><a href="../../gallery.html">gallery</a>| </li> <li><a href="../../contents.html">docs</a> »</li> </ul> </div> <div class="footer"> © Copyright 2012 John Hunter, Darren Dale, Eric Firing, Michael Droettboom and the matplotlib development team. 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