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  <div class="section" id="flowchart-node">
<h1>flowchart.Node<a class="headerlink" href="#flowchart-node" title="Permalink to this headline"></a></h1>
<dl class="class">
<dt id="pyqtgraph.flowchart.Node">
<em class="property">class </em><code class="descclassname">pyqtgraph.flowchart.</code><code class="descname">Node</code><span class="sig-paren">(</span><em>name</em>, <em>terminals=None</em>, <em>allowAddInput=False</em>, <em>allowAddOutput=False</em>, <em>allowRemove=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node" title="Permalink to this definition"></a></dt>
<dd><p>Node represents the basic processing unit of a flowchart. 
A Node subclass implements at least:</p>
<ol class="arabic simple">
<li>A list of input / ouptut terminals and their properties</li>
<li>a process() function which takes the names of input terminals as keyword arguments and returns a dict with the names of output terminals as keys.</li>
</ol>
<p>A flowchart thus consists of multiple instances of Node subclasses, each of which is connected
to other by wires between their terminals. A flowchart is, itself, also a special subclass of Node.
This allows Nodes within the flowchart to connect to the input/output nodes of the flowchart itself.</p>
<p>Optionally, a node class can implement the ctrlWidget() method, which must return a QWidget (usually containing other widgets) that will be displayed in the flowchart control panel. Some nodes implement fairly complex control widgets, but most nodes follow a simple form-like pattern: a list of parameter names and a single value (represented as spin box, check box, etc..) for each parameter. To make this easier, the CtrlNode subclass allows you to instead define a simple data structure that CtrlNode will use to automatically generate the control widget.</p>
<dl class="method">
<dt id="pyqtgraph.flowchart.Node.__init__">
<code class="descname">__init__</code><span class="sig-paren">(</span><em>name</em>, <em>terminals=None</em>, <em>allowAddInput=False</em>, <em>allowAddOutput=False</em>, <em>allowRemove=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.__init__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.__init__" title="Permalink to this definition"></a></dt>
<dd><table border="1" class="docutils">
<colgroup>
<col width="19%" />
<col width="81%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td><strong>Arguments:</strong></td>
<td>&nbsp;</td>
</tr>
<tr class="row-even"><td>name</td>
<td>The name of this specific node instance. It can be any
string, but must be unique within a flowchart. Usually,
we simply let the flowchart decide on a name when calling
Flowchart.addNode(...)</td>
</tr>
<tr class="row-odd"><td>terminals</td>
<td><p class="first">Dict-of-dicts specifying the terminals present on this Node.
Terminal specifications look like:</p>
<div class="highlight-python"><div class="highlight"><pre>&#39;inputTerminalName&#39;: {&#39;io&#39;: &#39;in&#39;}
&#39;outputTerminalName&#39;: {&#39;io&#39;: &#39;out&#39;}
</pre></div>
</div>
<p class="last">There are a number of optional parameters for terminals:
multi, pos, renamable, removable, multiable, bypass. See
the Terminal class for more information.</p>
</td>
</tr>
<tr class="row-even"><td>allowAddInput</td>
<td>bool; whether the user is allowed to add inputs by the
context menu.</td>
</tr>
<tr class="row-odd"><td>allowAddOutput</td>
<td>bool; whether the user is allowed to add outputs by the
context menu.</td>
</tr>
<tr class="row-even"><td>allowRemove</td>
<td>bool; whether the user is allowed to remove this node by the
context menu.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.addInput">
<code class="descname">addInput</code><span class="sig-paren">(</span><em>name='Input'</em>, <em>**args</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.addInput"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.addInput" title="Permalink to this definition"></a></dt>
<dd><p>Add a new input terminal to this Node with the given name. Extra
keyword arguments are passed to Terminal.__init__.</p>
<p>This is a convenience function that just calls addTerminal(io=&#8217;in&#8217;, ...)</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.addOutput">
<code class="descname">addOutput</code><span class="sig-paren">(</span><em>name='Output'</em>, <em>**args</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.addOutput"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.addOutput" title="Permalink to this definition"></a></dt>
<dd><p>Add a new output terminal to this Node with the given name. Extra
keyword arguments are passed to Terminal.__init__.</p>
<p>This is a convenience function that just calls addTerminal(io=&#8217;out&#8217;, ...)</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.addTerminal">
<code class="descname">addTerminal</code><span class="sig-paren">(</span><em>name</em>, <em>**opts</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.addTerminal"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.addTerminal" title="Permalink to this definition"></a></dt>
<dd><p>Add a new terminal to this Node with the given name. Extra
keyword arguments are passed to Terminal.__init__.</p>
<p>Causes sigTerminalAdded to be emitted.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.bypass">
<code class="descname">bypass</code><span class="sig-paren">(</span><em>byp</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.bypass"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.bypass" title="Permalink to this definition"></a></dt>
<dd><p>Set whether this node should be bypassed.</p>
<p>When bypassed, a Node&#8217;s process() method is never called. In some cases,
data is automatically copied directly from specific input nodes to 
output nodes instead (see the bypass argument to Terminal.__init__). 
This is usually called when the user disables a node from the flowchart 
control panel.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.close">
<code class="descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.close"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.close" title="Permalink to this definition"></a></dt>
<dd><p>Cleans up after the node&#8211;removes terminals, graphicsItem, widget</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.connected">
<code class="descname">connected</code><span class="sig-paren">(</span><em>localTerm</em>, <em>remoteTerm</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.connected"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.connected" title="Permalink to this definition"></a></dt>
<dd><p>Called whenever one of this node&#8217;s terminals is connected elsewhere.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.ctrlWidget">
<code class="descname">ctrlWidget</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.ctrlWidget"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.ctrlWidget" title="Permalink to this definition"></a></dt>
<dd><p>Return this Node&#8217;s control widget.</p>
<p>By default, Nodes have no control widget. Subclasses may reimplement this 
method to provide a custom widget. This method is called by Flowcharts
when they are constructing their Node list.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.dependentNodes">
<code class="descname">dependentNodes</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.dependentNodes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.dependentNodes" title="Permalink to this definition"></a></dt>
<dd><p>Return the list of nodes which provide direct input to this node</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.disconnected">
<code class="descname">disconnected</code><span class="sig-paren">(</span><em>localTerm</em>, <em>remoteTerm</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.disconnected"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.disconnected" title="Permalink to this definition"></a></dt>
<dd><p>Called whenever one of this node&#8217;s terminals is disconnected from another.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.graphicsItem">
<code class="descname">graphicsItem</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.graphicsItem"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.graphicsItem" title="Permalink to this definition"></a></dt>
<dd><p>Return the GraphicsItem for this node. Subclasses may re-implement
this method to customize their appearance in the flowchart.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.inputValues">
<code class="descname">inputValues</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.inputValues"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.inputValues" title="Permalink to this definition"></a></dt>
<dd><p>Return a dict of all input values currently assigned to this node.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.inputs">
<code class="descname">inputs</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.inputs"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.inputs" title="Permalink to this definition"></a></dt>
<dd><p>Return dict of all input terminals.
Warning: do not modify.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.isBypassed">
<code class="descname">isBypassed</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.isBypassed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.isBypassed" title="Permalink to this definition"></a></dt>
<dd><p>Return True if this Node is currently bypassed.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.name">
<code class="descname">name</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.name"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.name" title="Permalink to this definition"></a></dt>
<dd><p>Return the name of this node.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.nextTerminalName">
<code class="descname">nextTerminalName</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.nextTerminalName"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.nextTerminalName" title="Permalink to this definition"></a></dt>
<dd><p>Return an unused terminal name</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.outputValues">
<code class="descname">outputValues</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.outputValues"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.outputValues" title="Permalink to this definition"></a></dt>
<dd><p>Return a dict of all output values currently generated by this node.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.outputs">
<code class="descname">outputs</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.outputs"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.outputs" title="Permalink to this definition"></a></dt>
<dd><p>Return dict of all output terminals.
Warning: do not modify.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.process">
<code class="descname">process</code><span class="sig-paren">(</span><em>**kargs</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.process"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.process" title="Permalink to this definition"></a></dt>
<dd><p>Process data through this node. This method is called any time the flowchart 
wants the node to process data. It will be called with one keyword argument
corresponding to each input terminal, and must return a dict mapping the name
of each output terminal to its new value.</p>
<p>This method is also called with a &#8216;display&#8217; keyword argument, which indicates
whether the node should update its display (if it implements any) while processing
this data. This is primarily used to disable expensive display operations
during batch processing.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.processBypassed">
<code class="descname">processBypassed</code><span class="sig-paren">(</span><em>args</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.processBypassed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.processBypassed" title="Permalink to this definition"></a></dt>
<dd><p>Called when the flowchart would normally call Node.process, but this node is currently bypassed.
The default implementation looks for output terminals with a bypass connection and returns the
corresponding values. Most Node subclasses will _not_ need to reimplement this method.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.removeTerminal">
<code class="descname">removeTerminal</code><span class="sig-paren">(</span><em>term</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.removeTerminal"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.removeTerminal" title="Permalink to this definition"></a></dt>
<dd><p>Remove the specified terminal from this Node. May specify either the 
terminal&#8217;s name or the terminal itself.</p>
<p>Causes sigTerminalRemoved to be emitted.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.rename">
<code class="descname">rename</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.rename"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.rename" title="Permalink to this definition"></a></dt>
<dd><p>Rename this node. This will cause sigRenamed to be emitted.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.restoreState">
<code class="descname">restoreState</code><span class="sig-paren">(</span><em>state</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.restoreState"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.restoreState" title="Permalink to this definition"></a></dt>
<dd><p>Restore the state of this node from a structure previously generated
by saveState().</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.saveState">
<code class="descname">saveState</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.saveState"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.saveState" title="Permalink to this definition"></a></dt>
<dd><p>Return a dictionary representing the current state of this node
(excluding input / output values). This is used for saving/reloading
flowcharts. The default implementation returns this Node&#8217;s position,
bypass state, and information about each of its terminals.</p>
<p>Subclasses may want to extend this method, adding extra keys to the returned
dict.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.setInput">
<code class="descname">setInput</code><span class="sig-paren">(</span><em>**args</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.setInput"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.setInput" title="Permalink to this definition"></a></dt>
<dd><p>Set the values on input terminals. For most nodes, this will happen automatically through Terminal.inputChanged.
This is normally only used for nodes with no connected inputs.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.terminalRenamed">
<code class="descname">terminalRenamed</code><span class="sig-paren">(</span><em>term</em>, <em>oldName</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.terminalRenamed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.terminalRenamed" title="Permalink to this definition"></a></dt>
<dd><p>Called after a terminal has been renamed</p>
<p>Causes sigTerminalRenamed to be emitted.</p>
</dd></dl>

<dl class="method">
<dt id="pyqtgraph.flowchart.Node.update">
<code class="descname">update</code><span class="sig-paren">(</span><em>signal=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/pyqtgraph/flowchart/Node.html#Node.update"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pyqtgraph.flowchart.Node.update" title="Permalink to this definition"></a></dt>
<dd><p>Collect all input values, attempt to process new output values, and propagate downstream.
Subclasses should call update() whenever thir internal state has changed
(such as when the user interacts with the Node&#8217;s control widget). Update
is automatically called when the inputs to the node are changed.</p>
</dd></dl>

</dd></dl>

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