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<title>PlotDataItem &mdash; pyqtgraph v1.8 documentation</title>
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<div class="section" id="plotdataitem">
<h1>PlotDataItem<a class="headerlink" href="#plotdataitem" title="Permalink to this headline"></a></h1>
<dl class="class">
<dt id="pyqtgraph.PlotDataItem">
<em class="property">class </em><tt class="descclassname">pyqtgraph.</tt><tt class="descname">PlotDataItem</tt><big>(</big><em>*args</em>, <em>**kargs</em><big>)</big><a class="headerlink" href="#pyqtgraph.PlotDataItem" title="Permalink to this definition"></a></dt>
<dd><p>GraphicsItem for displaying plot curves, scatter plots, or both.</p>
<dl class="method">
<dt id="pyqtgraph.PlotDataItem.__init__">
<tt class="descname">__init__</tt><big>(</big><em>*args</em>, <em>**kargs</em><big>)</big><a class="headerlink" href="#pyqtgraph.PlotDataItem.__init__" title="Permalink to this definition"></a></dt>
<dd><p>There are many different ways to create a PlotDataItem:</p>
<p>Data initialization: (x,y data only)</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="33%" />
<col width="67%" />
</colgroup>
<tbody valign="top">
<tr><td>PlotDataItem(xValues, yValues)</td>
<td>x and y values may be any sequence (including ndarray) of real numbers</td>
</tr>
<tr><td>PlotDataItem(yValues)</td>
<td>y values only &#8211; x will be automatically set to range(len(y))</td>
</tr>
<tr><td>PlotDataItem(x=xValues, y=yValues)</td>
<td>x and y given by keyword arguments</td>
</tr>
<tr><td>PlotDataItem(ndarray(Nx2))</td>
<td>numpy array with shape (N, 2) where x=data[:,0] and y=data[:,1]</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Data initialization: (x,y data AND may include spot style)</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="32%" />
<col width="68%" />
</colgroup>
<tbody valign="top">
<tr><td>PlotDataItem(recarray)</td>
<td>numpy array with dtype=[(&#8216;x&#8217;, float), (&#8216;y&#8217;, float), ...]</td>
</tr>
<tr><td>PlotDataItem(list-of-dicts)</td>
<td>[{&#8216;x&#8217;: x, &#8216;y&#8217;: y, ...}, ...]</td>
</tr>
<tr><td>PlotDataItem(dict-of-lists)</td>
<td>{&#8216;x&#8217;: [...], &#8216;y&#8217;: [...], ...}</td>
</tr>
<tr><td>PlotDataItem(MetaArray)</td>
<td>1D array of Y values with X sepecified as axis values
OR 2D array with a column &#8216;y&#8217; and extra columns as needed.</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Line style keyword arguments:</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="8%" />
<col width="92%" />
</colgroup>
<tbody valign="top">
<tr><td>pen</td>
<td>pen to use for drawing line between points. Default is solid grey, 1px width. Use None to disable line drawing.</td>
</tr>
<tr><td>shadowPen</td>
<td>pen for secondary line to draw behind the primary line. disabled by default.</td>
</tr>
<tr><td>fillLevel</td>
<td>fill the area between the curve and fillLevel</td>
</tr>
<tr><td>fillBrush</td>
<td>fill to use when fillLevel is specified</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Point style keyword arguments:</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="12%" />
<col width="88%" />
</colgroup>
<tbody valign="top">
<tr><td>symbol</td>
<td>symbol to use for drawing points OR list of symbols, one per point. Default is no symbol.
options are o, s, t, d, +</td>
</tr>
<tr><td>symbolPen</td>
<td>outline pen for drawing points OR list of pens, one per point</td>
</tr>
<tr><td>symbolBrush</td>
<td>brush for filling points OR list of brushes, one per point</td>
</tr>
<tr><td>symbolSize</td>
<td>diameter of symbols OR list of diameters</td>
</tr>
<tr><td>pxMode</td>
<td>(bool) If True, then symbolSize is specified in pixels. If False, then symbolSize is
specified in data coordinates.</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Optimization keyword arguments:</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="10%" />
<col width="90%" />
</colgroup>
<tbody valign="top">
<tr><td>identical</td>
<td>spots are all identical. The spot image will be rendered only once and repeated for every point</td>
</tr>
<tr><td>decimate</td>
<td>(int) decimate data</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Meta-info keyword arguments:</p>
<blockquote>
<table border="1" class="docutils">
<colgroup>
<col width="17%" />
<col width="83%" />
</colgroup>
<tbody valign="top">
<tr><td>name</td>
<td>name of dataset. This would appear in a legend</td>
</tr>
</tbody>
</table>
</blockquote>
</dd></dl>
<dl class="method">
<dt id="pyqtgraph.PlotDataItem.setData">
<tt class="descname">setData</tt><big>(</big><em>*args</em>, <em>**kargs</em><big>)</big><a class="headerlink" href="#pyqtgraph.PlotDataItem.setData" title="Permalink to this definition"></a></dt>
<dd><p>Clear any data displayed by this item and display new data.
See <a class="reference internal" href="#pyqtgraph.PlotDataItem.__init__" title="pyqtgraph.PlotDataItem.__init__"><tt class="xref py py-func docutils literal"><span class="pre">__init__()</span></tt></a> for details; it accepts the same arguments.</p>
</dd></dl>
<dl class="method">
<dt id="pyqtgraph.PlotDataItem.setPen">
<tt class="descname">setPen</tt><big>(</big><em>pen</em><big>)</big><a class="headerlink" href="#pyqtgraph.PlotDataItem.setPen" title="Permalink to this definition"></a></dt>
<dd><div class="line-block">
<div class="line">Sets the pen used to draw lines between points.</div>
<div class="line"><em>pen</em> can be a QPen or any argument accepted by <a class="reference internal" href="../functions.html#pyqtgraph.mkPen" title="pyqtgraph.mkPen"><tt class="xref py py-func docutils literal"><span class="pre">pyqtgraph.mkPen()</span></tt></a></div>
</div>
</dd></dl>
<dl class="method">
<dt id="pyqtgraph.PlotDataItem.setShadowPen">
<tt class="descname">setShadowPen</tt><big>(</big><em>pen</em><big>)</big><a class="headerlink" href="#pyqtgraph.PlotDataItem.setShadowPen" title="Permalink to this definition"></a></dt>
<dd><div class="line-block">
<div class="line">Sets the shadow pen used to draw lines between points (this is for enhancing contrast or
emphacizing data). </div>
<div class="line">This line is drawn behind the primary pen (see <a class="reference internal" href="#pyqtgraph.PlotDataItem.setPen" title="pyqtgraph.PlotDataItem.setPen"><tt class="xref py py-func docutils literal"><span class="pre">setPen()</span></tt></a>)
and should generally be assigned greater width than the primary pen.</div>
<div class="line"><em>pen</em> can be a QPen or any argument accepted by <a class="reference internal" href="../functions.html#pyqtgraph.mkPen" title="pyqtgraph.mkPen"><tt class="xref py py-func docutils literal"><span class="pre">pyqtgraph.mkPen()</span></tt></a></div>
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