Two buttons added nicely: erase and autoscale.

webcamROI.py

@@ -14,7 +14,7 @@ from PyQt5.QtCore import QTimer
 #from myWidgets import anal_control_signal
 import sys
 from PyQt5.QtWidgets import QMainWindow, QApplication, QMessageBox, QPushButton, QGraphicsProxyWidget
-
+#from myWidgets import anal_control_signal
 
 
 
@@ -27,7 +27,7 @@ class roiWindow(QMainWindow):
         print(self.aoScan.name, self.aoScan.sb.val)
         
         
-        self.cap = cv2.VideoCapture(1)
+        self.cap = cv2.VideoCapture(0)
 
         self.n = int(1e2)
         self.data = np.zeros(self.n)
@@ -60,14 +60,14 @@ class roiWindow(QMainWindow):
         self.v2.addItem(self.im2)
 
         #plot real time
-        self.p = self.w.addPlot(row = 3, col = 0,  title="Updating plot")
+        self.p = self.w.addPlot(row = 3, col = 0,  title="Time plot")
         self.p.setRange(QtCore.QRectF(0, -10, 5000, 20)) 
         self.p.setAutoPan(y=True)
         self.p.setRange(xRange = (0, self.n), yRange = (0, 255))
 
         self.curve = self.p.plot(pen='y')
         
-        self.pv = self.w.addPlot(row = 4, col = 0,  title = "Updating plot")
+        self.pv = self.w.addPlot(row = 4, col = 0,  title = "Voltage plot")
         self.pv.setRange(QtCore.QRectF(0, -10, 5000, 20)) 
         self.pv.setAutoPan(y=True)
         self.curveVoltage = self.pv.plot(pen='y')
@@ -75,12 +75,21 @@ class roiWindow(QMainWindow):
         self.voltageDataY = []
         self.aoScan.ScanTimer.timeout.connect(self.updateVoltagePlotvsI)
     
-        self.eraseButton = QPushButton('Erase')
+        self.optionsLayout = pg.LayoutWidget()
+        self.eraseButton = QPushButton('Erase plot')
         self.eraseButton.clicked.connect(self.erasePlot)
+        self.autoScaleButton = QPushButton('Autoscale')
+        self.autoScaleButton.clicked.connect(self.autoScalePlot)
+        self.optionsLayout.addWidget(self.eraseButton, 0, 0)
+        self.optionsLayout.addWidget(self.autoScaleButton, 0, 1)
+        self.optionsLayout.setGeometry(10,10,300,200)
+        
+        
         
         proxy = QGraphicsProxyWidget()
-        proxy.setWidget(self.eraseButton)
-        self.pv.addItem(proxy,row=1,col=1)
+        proxy.setWidget(self.optionsLayout)
+        
+        self.w.addItem(proxy,row=5,col=0)
         
         
         self.lastRoi = None
@@ -101,13 +110,20 @@ class roiWindow(QMainWindow):
             self.voltageDataY = np.append(self.voltageDataY, self.newData)
             #○print(' Roi: ', self.voltageDataX[-1], self.voltageDataY[-1])
             
-            self.pv.setRange(xRange = (float(self.aoScan.scan_sb_start.val), float(self.aoScan.scan_sb_stop.val)), yRange = (0, 255))
+            
             self.curveVoltage.setData(self.voltageDataX, self.voltageDataY)
                 
     def erasePlot(self):
          self.voltageDataX = []
          self.voltageDataY = []
     
+    def autoScalePlot(self):
+        x_min = float(self.aoScan.scan_sb_start.val)
+        x_max = float(self.aoScan.scan_sb_stop.val)
+        y_min = 0
+        y_max = self.newData
+        self.pv.setRange(xRange = (x_min, x_max), yRange = (y_min, y_max))
+        
     def myCloseEvent(self, event):
         # this overrides the closeEvent method
         reply = QMessageBox.question(self, 'Message',
@@ -127,8 +143,8 @@ class roiWindow(QMainWindow):
     def capture(self):
         ret, frame = self.cap.read()
         #frame = cv2.resize(frame, None, fx = 0.5, fy = 0.5, interpolation = cv2.INTER_CUBIC)
-        gray_image = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
-        return gray_image
+        
+        return frame[:, :, 0]
 
     def updateImage(self):
         self.im1.setImage(self.capture(), cmap = 'Gray')