Added dv/Dt and V vs V' phasemap Plots to context tool in PlotDataItem

(cherry picked from commit 9d88041a0b3b165439d4e0e45923c83afaefb1ad)

pyqtgraph/graphicsItems/PlotDataItem.py

@@ -148,6 +148,8 @@ class PlotDataItem(GraphicsObject):
             
             'fftMode': False,
             'logMode': [False, False],
+            'derivativeMode': False,
+            'phasemapMode': False,
             'alphaHint': 1.0,
             'alphaMode': False,
             
@@ -213,7 +215,25 @@ class PlotDataItem(GraphicsObject):
         self.xClean = self.yClean = None
         self.updateItems()
         self.informViewBoundsChanged()
-    
+
+    def setDerivativeMode(self, mode):
+        if self.opts['derivativeMode'] == mode:
+            return
+        self.opts['derivativeMode'] = mode
+        self.xDisp = self.yDisp = None
+        self.xClean = self.yClean = None
+        self.updateItems()
+        self.informViewBoundsChanged()
+
+    def setPhasemapMode(self, mode):
+        if self.opts['phasemapMode'] == mode:
+            return
+        self.opts['phasemapMode'] = mode
+        self.xDisp = self.yDisp = None
+        self.xClean = self.yClean = None
+        self.updateItems()
+        self.informViewBoundsChanged()
+
     def setPointMode(self, mode):
         if self.opts['pointMode'] == mode:
             return
@@ -514,7 +534,13 @@ class PlotDataItem(GraphicsObject):
                 x = np.log10(x)
             if self.opts['logMode'][1]:
                 y = np.log10(y)
-                    
+            if self.opts['derivativeMode']:  # plot dV/dt
+                y = np.diff(self.yData)/np.diff(self.xData)
+                x = x[:-1]
+            if self.opts['phasemapMode']:  # plot dV/dt vs V
+                x = self.yData[:-1]
+                y = np.diff(self.yData)/np.diff(self.xData)
+            
             ds = self.opts['downsample']
             if not isinstance(ds, int):
                 ds = 1

pyqtgraph/graphicsItems/PlotItem/PlotItem.py

@@ -253,6 +253,8 @@ class PlotItem(GraphicsWidget):
         c.fftCheck.toggled.connect(self.updateSpectrumMode)
         c.logXCheck.toggled.connect(self.updateLogMode)
         c.logYCheck.toggled.connect(self.updateLogMode)
+        c.derivativeCheck.toggled.connect(self.updateDerivativeMode)
+        c.phasemapCheck.toggled.connect(self.updatePhasemapMode)
 
         c.downsampleSpin.valueChanged.connect(self.updateDownsampling)
         c.downsampleCheck.toggled.connect(self.updateDownsampling)
@@ -904,6 +906,23 @@ class PlotItem(GraphicsWidget):
         self.getAxis('right').setLogMode(y)
         self.enableAutoRange()
         self.recomputeAverages()
+    
+    def updateDerivativeMode(self):
+        d = self.ctrl.derivativeCheck.isChecked()
+        for i in self.items:
+            if hasattr(i, 'setDerivativeMode'):
+                i.setDerivativeMode(d)
+        self.enableAutoRange()
+        self.recomputeAverages()
+
+    def updatePhasemapMode(self):
+        d = self.ctrl.phasemapCheck.isChecked()
+        for i in self.items:
+            if hasattr(i, 'setPhasemapMode'):
+                i.setPhasemapMode(d)
+        self.enableAutoRange()
+        self.recomputeAverages()
+        
         
     def setDownsampling(self, ds=None, auto=None, mode=None):
         """Change the default downsampling mode for all PlotDataItems managed by this plot.

pyqtgraph/graphicsItems/PlotItem/plotConfigTemplate.ui

@@ -192,17 +192,17 @@
   <widget class="QFrame" name="transformGroup">
    <property name="geometry">
     <rect>
-     <x>0</x>
-     <y>0</y>
-     <width>154</width>
-     <height>79</height>
+     <x>10</x>
+     <y>10</y>
+     <width>171</width>
+     <height>101</height>
     </rect>
    </property>
    <layout class="QGridLayout" name="gridLayout">
-    <item row="0" column="0">
-     <widget class="QCheckBox" name="fftCheck">
+    <item row="2" column="0">
+     <widget class="QCheckBox" name="logYCheck">
       <property name="text">
-       <string>Power Spectrum (FFT)</string>
+       <string>Log Y</string>
       </property>
      </widget>
     </item>
@@ -213,10 +213,24 @@
       </property>
      </widget>
     </item>
-    <item row="2" column="0">
-     <widget class="QCheckBox" name="logYCheck">
+    <item row="0" column="0">
+     <widget class="QCheckBox" name="fftCheck">
       <property name="text">
-       <string>Log Y</string>
+       <string>Power Spectrum (FFT)</string>
+      </property>
+     </widget>
+    </item>
+    <item row="3" column="0">
+     <widget class="QCheckBox" name="derivativeCheck">
+      <property name="text">
+       <string>dV/dT</string>
+      </property>
+     </widget>
+    </item>
+    <item row="4" column="0">
+     <widget class="QCheckBox" name="phasemapCheck">
+      <property name="text">
+       <string>V vs. V'</string>
       </property>
      </widget>
     </item>