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<div class="sphx-glr-example-title section" id="modifying-the-coordinate-formatter">
<span id="sphx-glr-gallery-api-image-zcoord-py"></span><h1>Modifying the coordinate formatter<a class="headerlink" href="#modifying-the-coordinate-formatter" title="Permalink to this headline">¶</a></h1>
<p>Modify the coordinate formatter to report the image "z"
value of the nearest pixel given x and y</p>
<img alt="../../_images/sphx_glr_image_zcoord_001.png" class="sphx-glr-single-img" src="../../_images/sphx_glr_image_zcoord_001.png" />
<div class="highlight-default notranslate"><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">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="c1"># Fixing random state for reproducibility</span>
<span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">seed</span><span class="p">(</span><span class="mi">19680801</span><span class="p">)</span>
<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html#numpy.ndarray" title="View documentation for numpy.ndarray"><span class="n">X</span></a> <span class="o">=</span> <span class="mi">10</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="mi">5</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.figure.Figure.html#matplotlib.figure.Figure" title="View documentation for matplotlib.figure.Figure"><span class="n">fig</span></a><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots"><span class="n">plt</span><span class="o">.</span><span class="n">subplots</span></a><span class="p">()</span>
<span class="n">ax</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html#numpy.ndarray" title="View documentation for numpy.ndarray"><span class="n">X</span></a><span class="p">,</span> <span class="n">interpolation</span><span class="o">=</span><span class="s1">'nearest'</span><span class="p">)</span>
<a href="https://docs.python.org/3/library/functions.html#int" title="View documentation for builtins.int"><span class="n">numrows</span></a><span class="p">,</span> <a href="https://docs.python.org/3/library/functions.html#int" title="View documentation for builtins.int"><span class="n">numcols</span></a> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.shape.html#numpy.ndarray.shape" title="View documentation for numpy.ndarray.shape"><span class="n">X</span><span class="o">.</span><span class="n">shape</span></a>
<span class="k">def</span> <span class="nf">format_coord</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">col</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">x</span> <span class="o">+</span> <span class="mf">0.5</span><span class="p">)</span>
<span class="n">row</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">y</span> <span class="o">+</span> <span class="mf">0.5</span><span class="p">)</span>
<span class="k">if</span> <span class="n">col</span> <span class="o">>=</span> <span class="mi">0</span> <span class="ow">and</span> <span class="n">col</span> <span class="o"><</span> <a href="https://docs.python.org/3/library/functions.html#int" title="View documentation for builtins.int"><span class="n">numcols</span></a> <span class="ow">and</span> <span class="n">row</span> <span class="o">>=</span> <span class="mi">0</span> <span class="ow">and</span> <span class="n">row</span> <span class="o"><</span> <a href="https://docs.python.org/3/library/functions.html#int" title="View documentation for builtins.int"><span class="n">numrows</span></a><span class="p">:</span>
<span class="n">z</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html#numpy.ndarray" title="View documentation for numpy.ndarray"><span class="n">X</span></a><span class="p">[</span><span class="n">row</span><span class="p">,</span> <span class="n">col</span><span class="p">]</span>
<span class="k">return</span> <span class="s1">'x=</span><span class="si">%1.4f</span><span class="s1">, y=</span><span class="si">%1.4f</span><span class="s1">, z=</span><span class="si">%1.4f</span><span class="s1">'</span> <span class="o">%</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">z</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="s1">'x=</span><span class="si">%1.4f</span><span class="s1">, y=</span><span class="si">%1.4f</span><span class="s1">'</span> <span class="o">%</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">ax</span><span class="o">.</span><a href="https://docs.python.org/3/library/functions.html#object" title="View documentation for builtins.object"><span class="n">format_coord</span></a> <span class="o">=</span> <a href="https://docs.python.org/3/library/functions.html#object" title="View documentation for builtins.object"><span class="n">format_coord</span></a>
<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show"><span class="n">plt</span><span class="o">.</span><span class="n">show</span></a><span class="p">()</span>
</pre></div>
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<a class="reference download internal" download="" href="../../_downloads/e96cb47f81c2edcf17249bb6a9cb0008/image_zcoord.py"><code class="xref download docutils literal notranslate"><span class="pre">Download</span> <span class="pre">Python</span> <span class="pre">source</span> <span class="pre">code:</span> <span class="pre">image_zcoord.py</span></code></a></div>
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