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<div class="section" id="event-handling-example-code-poly-editor-py">
<span id="event-handling-poly-editor"></span><h1>event_handling example code: poly_editor.py<a class="headerlink" href="#event-handling-example-code-poly-editor-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="poly_editor.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">This is an example to show how to build cross-GUI applications using</span>
<span class="sd">matplotlib event handling to interact with objects on the canvas</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">matplotlib.artist</span> <span class="kn">import</span> <span class="n">Artist</span>
<span class="kn">from</span> <span class="nn">matplotlib.patches</span> <span class="kn">import</span> <span class="n">Polygon</span><span class="p">,</span> <span class="n">CirclePolygon</span>
<span class="kn">from</span> <span class="nn">numpy</span> <span class="kn">import</span> <span class="n">sqrt</span><span class="p">,</span> <span class="n">nonzero</span><span class="p">,</span> <span class="n">equal</span><span class="p">,</span> <span class="n">array</span><span class="p">,</span> <span class="n">asarray</span><span class="p">,</span> <span class="n">dot</span><span class="p">,</span> <span class="n">amin</span><span class="p">,</span> <span class="n">cos</span><span class="p">,</span> <span class="n">sin</span>
<span class="kn">from</span> <span class="nn">matplotlib.mlab</span> <span class="kn">import</span> <span class="n">dist_point_to_segment</span>
<span class="k">class</span> <span class="nc">PolygonInteractor</span><span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> An polygon editor.</span>
<span class="sd"> Key-bindings</span>
<span class="sd"> 't' toggle vertex markers on and off. When vertex markers are on,</span>
<span class="sd"> you can move them, delete them</span>
<span class="sd"> 'd' delete the vertex under point</span>
<span class="sd"> 'i' insert a vertex at point. You must be within epsilon of the</span>
<span class="sd"> line connecting two existing vertices</span>
<span class="sd"> """</span>
<span class="n">showverts</span> <span class="o">=</span> <span class="bp">True</span>
<span class="n">epsilon</span> <span class="o">=</span> <span class="mi">5</span> <span class="c"># max pixel distance to count as a vertex hit</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">poly</span><span class="p">):</span>
<span class="k">if</span> <span class="n">poly</span><span class="o">.</span><span class="n">figure</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s">'You must first add the polygon to a figure or canvas before defining the interactor'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span> <span class="o">=</span> <span class="n">ax</span>
<span class="n">canvas</span> <span class="o">=</span> <span class="n">poly</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">poly</span> <span class="o">=</span> <span class="n">poly</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span> <span class="o">=</span> <span class="n">Line2D</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">marker</span><span class="o">=</span><span class="s">'o'</span><span class="p">,</span> <span class="n">markerfacecolor</span><span class="o">=</span><span class="s">'r'</span><span class="p">,</span> <span class="n">animated</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">add_line</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="p">)</span>
<span class="c">#self._update_line(poly)</span>
<span class="n">cid</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">add_callback</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly_changed</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_ind</span> <span class="o">=</span> <span class="bp">None</span> <span class="c"># the active vert</span>
<span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'draw_event'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">draw_callback</span><span class="p">)</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">button_press_callback</span><span class="p">)</span>
<span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'key_press_event'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">key_press_callback</span><span class="p">)</span>
<span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'button_release_event'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">button_release_callback</span><span class="p">)</span>
<span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'motion_notify_event'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">motion_notify_callback</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">canvas</span>
<span class="k">def</span> <span class="nf">draw_callback</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="bp">self</span><span class="o">.</span><span class="n">background</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">copy_from_bbox</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">draw_artist</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">draw_artist</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">line</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">blit</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">poly_changed</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">poly</span><span class="p">):</span>
<span class="s">'this method is called whenever the polygon object is called'</span>
<span class="c"># only copy the artist props to the line (except visibility)</span>
<span class="n">vis</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">get_visible</span><span class="p">()</span>
<span class="n">Artist</span><span class="o">.</span><span class="n">update_from</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="p">,</span> <span class="n">poly</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">set_visible</span><span class="p">(</span><span class="n">vis</span><span class="p">)</span> <span class="c"># don't use the poly visibility state</span>
<span class="k">def</span> <span class="nf">get_ind_under_point</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="s">'get the index of the vertex under point if within epsilon tolerance'</span>
<span class="c"># display coords</span>
<span class="n">xy</span> <span class="o">=</span> <span class="n">asarray</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">)</span>
<span class="n">xyt</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">get_transform</span><span class="p">()</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">xy</span><span class="p">)</span>
<span class="n">xt</span><span class="p">,</span> <span class="n">yt</span> <span class="o">=</span> <span class="n">xyt</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">xyt</span><span class="p">[:,</span> <span class="mi">1</span><span class="p">]</span>
<span class="n">d</span> <span class="o">=</span> <span class="n">sqrt</span><span class="p">((</span><span class="n">xt</span><span class="o">-</span><span class="n">event</span><span class="o">.</span><span class="n">x</span><span class="p">)</span><span class="o">**</span><span class="mi">2</span> <span class="o">+</span> <span class="p">(</span><span class="n">yt</span><span class="o">-</span><span class="n">event</span><span class="o">.</span><span class="n">y</span><span class="p">)</span><span class="o">**</span><span class="mi">2</span><span class="p">)</span>
<span class="n">indseq</span> <span class="o">=</span> <span class="n">nonzero</span><span class="p">(</span><span class="n">equal</span><span class="p">(</span><span class="n">d</span><span class="p">,</span> <span class="n">amin</span><span class="p">(</span><span class="n">d</span><span class="p">)))[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">ind</span> <span class="o">=</span> <span class="n">indseq</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="n">d</span><span class="p">[</span><span class="n">ind</span><span class="p">]</span><span class="o">>=</span><span class="bp">self</span><span class="o">.</span><span class="n">epsilon</span><span class="p">:</span>
<span class="n">ind</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">return</span> <span class="n">ind</span>
<span class="k">def</span> <span class="nf">button_press_callback</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="s">'whenever a mouse button is pressed'</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">showverts</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="o">==</span><span class="bp">None</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">button</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_ind</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_ind_under_point</span><span class="p">(</span><span class="n">event</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">button_release_callback</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="s">'whenever a mouse button is released'</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">showverts</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">button</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_ind</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">def</span> <span class="nf">key_press_callback</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="s">'whenever a key is pressed'</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">event</span><span class="o">.</span><span class="n">inaxes</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">key</span><span class="o">==</span><span class="s">'t'</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">showverts</span> <span class="o">=</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">showverts</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">set_visible</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">showverts</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">showverts</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ind</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">elif</span> <span class="n">event</span><span class="o">.</span><span class="n">key</span><span class="o">==</span><span class="s">'d'</span><span class="p">:</span>
<span class="n">ind</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_ind_under_point</span><span class="p">(</span><span class="n">event</span><span class="p">)</span>
<span class="k">if</span> <span class="n">ind</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span> <span class="o">=</span> <span class="p">[</span><span class="n">tup</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span><span class="n">tup</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">)</span> <span class="k">if</span> <span class="n">i</span><span class="o">!=</span><span class="n">ind</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">set_data</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">event</span><span class="o">.</span><span class="n">key</span><span class="o">==</span><span class="s">'i'</span><span class="p">:</span>
<span class="n">xys</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">get_transform</span><span class="p">()</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">event</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">event</span><span class="o">.</span><span class="n">y</span> <span class="c"># display coords</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="n">xys</span><span class="p">)</span><span class="o">-</span><span class="mi">1</span><span class="p">):</span>
<span class="n">s0</span> <span class="o">=</span> <span class="n">xys</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
<span class="n">s1</span> <span class="o">=</span> <span class="n">xys</span><span class="p">[</span><span class="n">i</span><span class="o">+</span><span class="mi">1</span><span class="p">]</span>
<span class="n">d</span> <span class="o">=</span> <span class="n">dist_point_to_segment</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">s0</span><span class="p">,</span> <span class="n">s1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">d</span><span class="o"><=</span><span class="bp">self</span><span class="o">.</span><span class="n">epsilon</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span> <span class="o">=</span> <span class="n">array</span><span class="p">(</span>
<span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">[:</span><span class="n">i</span><span class="p">])</span> <span class="o">+</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="o">+</span>
<span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">[</span><span class="n">i</span><span class="p">:]))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">set_data</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">))</span>
<span class="k">break</span>
<span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">draw</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">motion_notify_callback</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="s">'on mouse movement'</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">showverts</span><span class="p">:</span> <span class="k">return</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ind</span> <span class="ow">is</span> <span class="bp">None</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="k">if</span> <span class="n">event</span><span class="o">.</span><span class="n">button</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span>
<span class="n">x</span><span class="p">,</span><span class="n">y</span> <span class="o">=</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="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">_ind</span><span class="p">]</span> <span class="o">=</span> <span class="n">x</span><span class="p">,</span><span class="n">y</span>
<span class="bp">self</span><span class="o">.</span><span class="n">line</span><span class="o">.</span><span class="n">set_data</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="o">*</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="o">.</span><span class="n">xy</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">restore_region</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">background</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">draw_artist</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">poly</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">draw_artist</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">line</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">blit</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">pylab</span> <span class="kn">import</span> <span class="o">*</span>
<span class="n">fig</span> <span class="o">=</span> <span class="n">figure</span><span class="p">()</span>
<span class="n">theta</span> <span class="o">=</span> <span class="n">arange</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">pi</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">)</span>
<span class="n">r</span> <span class="o">=</span> <span class="mf">1.5</span>
<span class="n">xs</span> <span class="o">=</span> <span class="n">r</span><span class="o">*</span><span class="n">cos</span><span class="p">(</span><span class="n">theta</span><span class="p">)</span>
<span class="n">ys</span> <span class="o">=</span> <span class="n">r</span><span class="o">*</span><span class="n">sin</span><span class="p">(</span><span class="n">theta</span><span class="p">)</span>
<span class="n">poly</span> <span class="o">=</span> <span class="n">Polygon</span><span class="p">(</span><span class="nb">zip</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="n">animated</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">ax</span> <span class="o">=</span> <span class="n">subplot</span><span class="p">(</span><span class="mi">111</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">poly</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">PolygonInteractor</span><span class="p">(</span> <span class="n">ax</span><span class="p">,</span> <span class="n">poly</span><span class="p">)</span>
<span class="c">#ax.add_line(p.line)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s">'Click and drag a point to move it'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">((</span><span class="o">-</span><span class="mi">2</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">set_ylim</span><span class="p">((</span><span class="o">-</span><span class="mi">2</span><span class="p">,</span><span class="mi">2</span><span class="p">))</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>
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