synchronizing two imageview widgets

[Dirk Boonzajer Flaes]

Hi there,

I'd like to analyze two linked images (they are amplitude and phase of an electric field) in a stack of images. Therefore I'd like to synchronize the x, y and t axes of an imageview. To set up something like that, Islightly adapted the example code:


import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np

## Create window with two ImageView widgets
win = QtGui.QMainWindow()
win.resize(800,800)
win.setWindowTitle('pyqtgraph example: DataSlicing')
cw = QtGui.QWidget()
win.setCentralWidget(cw)
l = QtGui.QGridLayout()
cw.setLayout(l)
imv1 = pg.ImageView(view=pg.PlotItem())
imv2 = pg.ImageView(view=pg.PlotItem())
l.addWidget(imv1, 0, 0)
l.addWidget(imv2, 1, 0)
# link the two views
imv1.view.setXLink(imv2.view)
imv1.view.setYLink(imv2.view)
win.show()

def display_amp_phase(E):
    amp = abs(E)
    phase = np.angle(E)
   
    imv1.setImage(amp)
    imv2.setImage(phase)
   

display_amp_phase(exp(1j*np.random.rand(5,1000,1000)))



However, there is no such function as setTLink to make sure that when scrolling through the stack of images both of them scroll to the same image. How do I do that? I found out that there is a
imv2.timeLine.value()
and
imv2.timeLine.setValue,

so somehow they need to be linked together, but how do I set that up?

regards,

Dirk Boonzajer

[vas...@gmail.com]

Maybe to do that as update if there is no similar link function:

import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np

app = QtGui.QApplication([])

## Create window with two ImageView widgets
win = QtGui.QMainWindow()
win.resize(800,800)
win.setWindowTitle('pyqtgraph example: DataSlicing')
cw = QtGui.QWidget()
win.setCentralWidget(cw)
l = QtGui.QGridLayout()
cw.setLayout(l)
imv1 = pg.ImageView(view=pg.PlotItem())
imv2 = pg.ImageView(view=pg.PlotItem())
l.addWidget(imv1, 0, 0)
l.addWidget(imv2, 1, 0)
# link the two views
imv1.view.setXLink(imv2.view)
imv1.view.setYLink(imv2.view)
win.show()

def display_amp_phase(E):
    amp = abs(E)
    phase = np.angle(E)
  
    imv1.setImage(amp)
    imv2.setImage(phase)

def update():
    v = imv1.timeLine.value()
    imv2.timeLine.setValue(v)

display_amp_phase(np.exp(1j*np.random.rand(5,1000,1000)))

timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)

if __name__ == '__main__':
    import sys
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

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[Dirk Boonzajer]

Hi Vasske,

Thanks for the swift reply. It almost works. It works properly as long as I scroll (or use the keys) in the upper image, but I cannot change the frame I'm examining from the bottom image. Would it be possible to truly link the two? Or maybe we can map the keyboard keys to the other frame, and disable the second slider altogether (I do not need any ROI info).

regards,

Dirk

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[Luke Campagnola]

Here's an easy example:

import pyqtgraph as pg

pg.mkQApp()

v1 = pg.image(pg.np.random.normal(size=(100, 100, 100)))

v2 = pg.image(pg.np.random.normal(size=(100, 100, 100)))

v2.sigTimeChanged.connect(v1.setCurrentIndex)

v1.sigTimeChanged.connect(v2.setCurrentIndex)

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