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<div class="section" id="api-example-code-bbox-intersect-py">

<span id="api-bbox-intersect"></span><h1>api example code: bbox_intersect.py<a class="headerlink" href="#api-example-code-bbox-intersect-py" title="Permalink to this headline">¶</a></h1>

<p>(<a class="reference external" href="../../mpl_examples/api/bbox_intersect.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/bbox_intersect.png">png</a>, <a class="reference external" href="../../mpl_examples/api/bbox_intersect.pdf">pdf</a>)</p>

<div class="figure">

<img alt="../../_images/bbox_intersect.png" src="../../_images/bbox_intersect.png" />

<div class="highlight-default"><div class="highlight"><pre><span></span><span class="sd">&quot;&quot;&quot;</span>

<span class="sd">===========================================</span>

<span class="sd">Changing colors of lines intersecting a box</span>

<span class="sd">===========================================</span>

<span class="sd">The lines intersecting the rectangle are colored in red, while the others</span>

<span class="sd">are left as blue lines. This example showcases the `intersect_bbox` function.</span>

<span class="sd">&quot;&quot;&quot;</span>

<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>

<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>

<span class="kn">from</span> <span class="nn">matplotlib.transforms</span> <span class="k">import</span> <span class="n">Bbox</span>

<span class="kn">from</span> <span class="nn">matplotlib.path</span> <span class="k">import</span> <span class="n">Path</span>

<span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</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">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>

<span class="n">rect</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">Rectangle</span><span class="p">((</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">),</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s2">&quot;#aaaaaa&quot;</span><span class="p">)</span>

<span class="n">fig</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">subplots</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">rect</span><span class="p">)</span>

<span class="n">bbox</span> <span class="o">=</span> <span class="n">Bbox</span><span class="o">.</span><span class="n">from_bounds</span><span class="p">(</span><span class="n">left</span><span class="p">,</span> <span class="n">bottom</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</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="mi">12</span><span class="p">):</span>

<span class="n">vertices</span> <span class="o">=</span> <span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">random</span><span class="p">((</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> <span class="o">-</span> <span class="mf">0.5</span><span class="p">)</span> <span class="o">*</span> <span class="mf">6.0</span>

<span class="n">path</span> <span class="o">=</span> <span class="n">Path</span><span class="p">(</span><span class="n">vertices</span><span class="p">)</span>

<span class="k">if</span> <span class="n">path</span><span class="o">.</span><span class="n">intersects_bbox</span><span class="p">(</span><span class="n">bbox</span><span class="p">):</span>

<span class="n">color</span> <span class="o">=</span> <span class="s1">&#39;r&#39;</span>

<span class="k">else</span><span class="p">:</span>

<span class="n">color</span> <span class="o">=</span> <span class="s1">&#39;b&#39;</span>

<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">vertices</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">],</span> <span class="n">vertices</span><span class="p">[:,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">color</span><span class="o">=</span><span class="n">color</span><span class="p">)</span>

<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>

<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><span class="std std-ref">Search examples</span></a>)</p>

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