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<section id="usage">
<span id="qt-ref"></span><h1>Usage<a class="headerlink" href="#usage" title="Link to this heading">#</a></h1>
<p>PyVista has an interface for placing plots in <code class="docutils literal notranslate"><span class="pre">pyvistaqt</span></code> that extends the
functionality of the <code class="docutils literal notranslate"><span class="pre">QVTKRenderWindowInteractor</span></code> class.
The <code class="docutils literal notranslate"><span class="pre">pyvistaqt.QtInteractor</span></code> class allows you to have the same functionality
of the <code class="docutils literal notranslate"><span class="pre">Plotter</span></code> class within a Qt application.
This simplifies adding meshes, updating, and controlling them when using
Qt.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Please do keep in mind that the <code class="docutils literal notranslate"><span class="pre">BackgroundPlotter</span></code> <strong>does not</strong> create its
own event loop by default. By design, the plotter will look for an
active instance of <code class="docutils literal notranslate"><span class="pre">QApplication</span></code> instead. So in the end, it is up to the
user to manage this event loop and there are several ways to achieve this.
For example, it’s possible to start Python interactively with <code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">-i</span></code>,
use <code class="docutils literal notranslate"><span class="pre">ipython</span></code> or execute the Qt event loop by adding <code class="docutils literal notranslate"><span class="pre">plotter.app.exec_()</span></code>
to the end of the following code.</p>
</div>
<section id="background-plotting">
<h2>Background Plotting<a class="headerlink" href="#background-plotting" title="Link to this heading">#</a></h2>
<p>Normal PyVista plotting windows exhibit blocking behavior, but it is possible
to plot in the background and update the plotter in real-time using the
<code class="docutils literal notranslate"><span class="pre">BackgroundPlotter</span></code> object. This requires <code class="docutils literal notranslate"><span class="pre">pyvistaqt</span></code>, but otherwise appears
and functions like a normal PyVista <code class="docutils literal notranslate"><span class="pre">Plotter</span></code> instance. For example:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pyvista</span> <span class="k">as</span> <span class="nn">pv</span>
<span class="kn">from</span> <span class="nn">pyvistaqt</span> <span class="kn">import</span> <span class="n">BackgroundPlotter</span>
<span class="n">sphere</span> <span class="o">=</span> <span class="n">pv</span><span class="o">.</span><span class="n">Sphere</span><span class="p">()</span>
<span class="n">plotter</span> <span class="o">=</span> <span class="n">BackgroundPlotter</span><span class="p">()</span>
<span class="n">plotter</span><span class="o">.</span><span class="n">add_mesh</span><span class="p">(</span><span class="n">sphere</span><span class="p">)</span>
<span class="c1"># can now operate on the sphere and have it updated in the background</span>
<span class="n">sphere</span><span class="o">.</span><span class="n">points</span> <span class="o">*=</span> <span class="mf">0.5</span>
</pre></div>
</div>
</section>
<section id="multiple-plotters">
<h2>Multiple Plotters<a class="headerlink" href="#multiple-plotters" title="Link to this heading">#</a></h2>
<p>The following example shows how to use an interface with multiple plotters. Each
plotter can be selected and functions like a normal PyVista <code class="docutils literal notranslate"><span class="pre">Plotter</span></code> instance:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pyvista</span> <span class="k">as</span> <span class="nn">pv</span>
<span class="kn">from</span> <span class="nn">pyvistaqt</span> <span class="kn">import</span> <span class="n">MultiPlotter</span>
<span class="n">mp</span> <span class="o">=</span> <span class="n">MultiPlotter</span><span class="p">(</span><span class="n">nrows</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">ncols</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="n">mp</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="o">.</span><span class="n">add_mesh</span><span class="p">(</span><span class="n">pv</span><span class="o">.</span><span class="n">Sphere</span><span class="p">())</span>
<span class="n">mp</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="o">.</span><span class="n">add_mesh</span><span class="p">(</span><span class="n">pv</span><span class="o">.</span><span class="n">Cylinder</span><span class="p">())</span>
<span class="n">mp</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="n">add_mesh</span><span class="p">(</span><span class="n">pv</span><span class="o">.</span><span class="n">Cube</span><span class="p">())</span>
<span class="n">mp</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="n">add_mesh</span><span class="p">(</span><span class="n">pv</span><span class="o">.</span><span class="n">Cone</span><span class="p">())</span>
</pre></div>
</div>
</section>
<section id="example-pyqt5-pyvista-qtinteractor">
<h2>Example PyQt5 PyVista QtInteractor<a class="headerlink" href="#example-pyqt5-pyvista-qtinteractor" title="Link to this heading">#</a></h2>
<p>The following example shows how to create a simple application that adds a
sphere to an empty plotting window.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">sys</span>
<span class="c1"># Setting the Qt bindings for QtPy</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s2">"QT_API"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"pyqt5"</span>
<span class="kn">from</span> <span class="nn">qtpy</span> <span class="kn">import</span> <span class="n">QtWidgets</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">pyvista</span> <span class="k">as</span> <span class="nn">pv</span>
<span class="kn">from</span> <span class="nn">pyvistaqt</span> <span class="kn">import</span> <span class="n">QtInteractor</span><span class="p">,</span> <span class="n">MainWindow</span>
<span class="k">class</span> <span class="nc">MyMainWindow</span><span class="p">(</span><span class="n">MainWindow</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">parent</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">show</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="n">QtWidgets</span><span class="o">.</span><span class="n">QMainWindow</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">parent</span><span class="p">)</span>
<span class="c1"># create the frame</span>
<span class="bp">self</span><span class="o">.</span><span class="n">frame</span> <span class="o">=</span> <span class="n">QtWidgets</span><span class="o">.</span><span class="n">QFrame</span><span class="p">()</span>
<span class="n">vlayout</span> <span class="o">=</span> <span class="n">QtWidgets</span><span class="o">.</span><span class="n">QVBoxLayout</span><span class="p">()</span>
<span class="c1"># add the pyvista interactor object</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plotter</span> <span class="o">=</span> <span class="n">QtInteractor</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">frame</span><span class="p">)</span>
<span class="n">vlayout</span><span class="o">.</span><span class="n">addWidget</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">plotter</span><span class="o">.</span><span class="n">interactor</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">signal_close</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">plotter</span><span class="o">.</span><span class="n">close</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">frame</span><span class="o">.</span><span class="n">setLayout</span><span class="p">(</span><span class="n">vlayout</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">setCentralWidget</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">frame</span><span class="p">)</span>
<span class="c1"># simple menu to demo functions</span>
<span class="n">mainMenu</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">menuBar</span><span class="p">()</span>
<span class="n">fileMenu</span> <span class="o">=</span> <span class="n">mainMenu</span><span class="o">.</span><span class="n">addMenu</span><span class="p">(</span><span class="s1">'File'</span><span class="p">)</span>
<span class="n">exitButton</span> <span class="o">=</span> <span class="n">QtWidgets</span><span class="o">.</span><span class="n">QAction</span><span class="p">(</span><span class="s1">'Exit'</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span>
<span class="n">exitButton</span><span class="o">.</span><span class="n">setShortcut</span><span class="p">(</span><span class="s1">'Ctrl+Q'</span><span class="p">)</span>
<span class="n">exitButton</span><span class="o">.</span><span class="n">triggered</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">close</span><span class="p">)</span>
<span class="n">fileMenu</span><span class="o">.</span><span class="n">addAction</span><span class="p">(</span><span class="n">exitButton</span><span class="p">)</span>
<span class="c1"># allow adding a sphere</span>
<span class="n">meshMenu</span> <span class="o">=</span> <span class="n">mainMenu</span><span class="o">.</span><span class="n">addMenu</span><span class="p">(</span><span class="s1">'Mesh'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_sphere_action</span> <span class="o">=</span> <span class="n">QtWidgets</span><span class="o">.</span><span class="n">QAction</span><span class="p">(</span><span class="s1">'Add Sphere'</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">add_sphere_action</span><span class="o">.</span><span class="n">triggered</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">add_sphere</span><span class="p">)</span>
<span class="n">meshMenu</span><span class="o">.</span><span class="n">addAction</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">add_sphere_action</span><span class="p">)</span>
<span class="k">if</span> <span class="n">show</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">add_sphere</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="w"> </span><span class="sd">""" add a sphere to the pyqt frame """</span>
<span class="n">sphere</span> <span class="o">=</span> <span class="n">pv</span><span class="o">.</span><span class="n">Sphere</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plotter</span><span class="o">.</span><span class="n">add_mesh</span><span class="p">(</span><span class="n">sphere</span><span class="p">,</span> <span class="n">show_edges</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">plotter</span><span class="o">.</span><span class="n">reset_camera</span><span class="p">()</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">QtWidgets</span><span class="o">.</span><span class="n">QApplication</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">)</span>
<span class="n">window</span> <span class="o">=</span> <span class="n">MyMainWindow</span><span class="p">()</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="n">app</span><span class="o">.</span><span class="n">exec_</span><span class="p">())</span>
</pre></div>
</div>
<figure class="align-default" id="id1">
<a class="reference internal image-reference" href="_images/qt_plotting_sphere.png"><img alt="_images/qt_plotting_sphere.png" src="_images/qt_plotting_sphere.png" style="width: 600pt;" />
</a>
<figcaption>
<p><span class="caption-text">PyQt5 pyvista QtInteractor</span><a class="headerlink" href="#id1" title="Link to this image">#</a></p>
</figcaption>
</figure>
</section>
<section id="using-different-qt-bindings">
<h2>Using Different Qt bindings<a class="headerlink" href="#using-different-qt-bindings" title="Link to this heading">#</a></h2>
<p>To use different Qt bindings you must first install them.
For example, to use <em>PySide2</em>, you install it via:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>PySide2
</pre></div>
</div>
<p>Then you set the <code class="docutils literal notranslate"><span class="pre">QT_API</span></code> value to the specific binding you would
like to use:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s2">"QT_API"</span><span class="p">]</span> <span class="o">=</span> <span class="s2">"pyside2"</span>
</pre></div>
</div>
<p>Please refer to the
<a class="reference external" href="https://github.com/spyder-ide/qtpy">*QtPy* documentation page</a>
for more information.</p>
</section>
</section>
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