Difference between outputs PySide/PyQt4 on windows

[dhabbyc]

Hello,

 I'm a little bit confused: i have a windows OS and both PySide (1.2.4) and PyQt4 installed.

 When I run the "histogram" example just as it is, pyqtgraph chooses pyqt4, and the histogram look like expected:

 

But when I use PySide, this is the result:

When I click and drag the image, the plot appears, but no axes:

Is this a bug or I'm doing something wrong.

This is the script I'm using:

# -*- coding: utf-8 -*-

"""

In this example we draw two different kinds of histogram.

"""

#import initExample ## Add path to library (just for examples; you do not need this)

#import PySide

import pyqtgraph as pg

from pyqtgraph.Qt import QtCore, QtGui, USE_PYSIDE, USE_PYQT4

import numpy as np

print pg.USE_PYSIDE, pg.USE_PYQT4

win = pg.GraphicsWindow()

win.resize(800,350)

win.setWindowTitle('pyqtgraph example: Histogram')

plt1 = win.addPlot()

#plt2 = win.addPlot()

## make interesting distribution of values

vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)])

## compute standard histogram

y,x = np.histogram(vals, bins=np.linspace(-3, 8, 40))

## Using stepMode=True causes the plot to draw two lines for each sample.

## notice that len(x) == len(y)+1

plt1.plot(x, y, stepMode=True, fillLevel=0, brush=(0,0,255,150))

## Now draw all points as a nicely-spaced scatter plot

#y = pg.pseudoScatter(vals, spacing=0.15)

#plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5)

#plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150))

## Start Qt event loop unless running in interactive mode or using pyside.

if __name__ == '__main__':

    import sys

    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):

        QtGui.QApplication.instance().exec_()

Could someone help me please?

[Luke Campagnola]

This is just a guess, but I think this may be related to using scaling / high DPI in windows, and I think it may have been fixed already. Could you try the latest code from the develop branch on github?

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[Diego Mancilla]

Hello Luke,

 Thank you for your answers. I will try what you suggest. I'll let you know.

d. 

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[Diego Mancilla]

Hello Luke,

 I've downloaded and installed the branch from git. Now, using PySide, the "out of scope" initial problem is solved (the histogram is correclty shown -centered- on the plot window), but still no axes.

​

Do you have another idea?  

[Luke Campagnola]

I don't have any other ideas at the moment. I will see if I can find a windows machine + high DPI + PySide to test on.

Meanwhile, can you post the output of pg.systemInfo() ?

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[Diego Mancilla]

Thank you Luke,

 Here is what you requested:

sys.platform: win32

sys.version: 2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AMD64)]

qt bindings: PySide 1.2.4 Qt 4.8.7

pyqtgraph: 0.11.0.dev0+ga240766; None

config:

{'antialias': False,

 'background': 'k',

 'crashWarning': False,

 'editorCommand': None,

 'enableExperimental': False,

 'exitCleanup': True,

 'foreground': 'd',

 'imageAxisOrder': 'col-major',

 'leftButtonPan': True,

 'useOpenGL': False,

 'useWeave': False,

 'weaveDebug': False}

None

Regards.

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[Diego Mancilla]

Hello Luke,

 After some digging around in the pyqtgraph code I found that the "paint" method of the AxisItem class never gets called using pyside (at least not on my machine, which in deed has a high DPI monitor). Actually nothing thats inherits from GraphicsWidget gets his paint method called ... ever. I searched in the qt docs ways to force que painting of items but I came out short. Updating the related items (update method) produces no effect. 

 By the way, the Axis items are present in the undelaying scene (and view) or at least they show up at the output of 'items' method.

 D.