RemoteGraphicsView, adding items, and signals/slots

[Geoffrey Barrett]

Hello,

I am trying to do something similar to the crosshair.py example but with RemoteGraphicsView. 

Hypothetically if I have something similar to this:

from PyQt4 import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
import pyqtgraph.widgets.RemoteGraphicsView
import sys

class main_window(QtGui.QWidget):
   """class that will serve as main window"""
   def __init__(self):
       super(main_window, self).__init__()

       # view 1

       self.view1 = pg.widgets.RemoteGraphicsView.RemoteGraphicsView()
       self.plot1 = self.view1.pg.PlotItem()
       self.view1.setCentralItem(self.plot1)

       # view 2
       self.view2 = pg.widgets.RemoteGraphicsView.RemoteGraphicsView()
       self.plot2 = self.view2.pg.PlotItem()
       self.view2.setCentralItem(self.plot2)

        
       # add Layout to widget

       layout = QtGui.QVBoxLayout()

       layout.addWidget(self.view1)
       layout.addWidget(self.view2)

       self.setLayout(layout)

       self.show()

       self.plot()

   def plot(self):
       """Plot random stuff for test"""
       t = np.arange(10000)/500
       data = np.random.rand(1, len(t))
       self.plot1.plot(t, data.flatten())
       self.plot2.plot(t, data.flatten())
    
       # add linear region item
       # self.lr = pg.LinearRegionItem()  # this doesn't work it seems
       # self.plot1.addItem(self.lr)
       # RuntimeError: super-class __init__() of type InfiniteLine was never called

       self.lr = self.view2.pg.LinearRegionItem()  # this appears to work
       self.plot2.addItem(self.lr)
       
       self.lr_proxy = pg.multiprocess.proxy(self.update_view1, callSync='off', autoProxy=True)
       self.lr.sigRegionChanged.connect(self.lr_proxy)

   def update_view1(self):
       # This doesn't appear to be called at all
       minX, maxX, = self.lr.getRegion()
       self.view2.vb.setXRange(minX, maxX)

def run():

    app = pg.mkQApp()
    win = main_window()
    sys.exit(app.exec_())


if __name__ == '__main__':
    run()

When you move the linear region nothing happens so there's something wrong. I used a proxy to connect the update_view1 slot to the sigRegionChanged signal because I was getting a pickling error otherwise. Any advice would be appreciated.

-Geoff

[Geoffrey Barrett]

Also should be the following (I mistakenly put view2 instead of view1:

def update_view1(self):
       # This doesn't appear to be called at all
       minX, maxX, = self.lr.getRegion()


       self.plot1.vb.setXRange(minX, maxX)

[Geoffrey Barrett]

Still working on this issue if anyone has tried to remotely plot the crosshair example.

On Friday, December 8, 2017 at 11:10:53 AM UTC-5, Geoffrey Barrett wrote: