I mean PySide2 (version 5.15.2)... -------- Original message --------From: 'Oli N' via pyqtgraph <[email protected]> Date: 08/01/2022 23:00 (GMT+08:00) To: pyqtgraph <[email protected]> Subject: [pyqtgraph] Re: Subclassing pg.ImageView failing in 0.12.2 and later I have made some progress with this.I upgraded from PySide 6.0.2 to 6.2.2.1 (the latest available in PyPi) the AttributeError: 'PySide6.QtGui.QLinearGradient' object has no attribute 'setStops' error disappeared, only to be replaced by another, well OK- the same one multiple times:Traceback (most recent call last): File "c:\Users\oli_n\pycode\examview\.examview.env\lib\site-packages\pyqtgraph\graphicsItems\GraphicsObject.py", line 24, in itemChange self.parentChanged()TypeError: native Qt signal is not callableThe same error (for a couple of different lines in the same file) is repeated multiple times (_many times_) but the code runs OK.(yes - I receive a deprecation warning about this line sys.exit(app.exec_()) but of course that's OK)I switched back to PySide 5 (5.15.2) and all runs well with pyqtgraph 0.12.3 with no errors/warnings.So I am now only using PySide 5, which isn't a problem right now, but it sounds like support for this will be dropped by pyqtgraph soon.__________________OK- This seems to be related to what should have been fixed by PR #2132 (related to the PySIde bug https://bugreports.qt.io/browse/PYSIDE-1730 ).Hopefully this makes it into the next pyqtgraph release.Cheers- OliOn Wednesday, January 5, 2022 at 1:17:30 PM UTC+8 Oli N wrote:Hi all- I am trying to implement a way to interactively invert greyscale image colours. I would like to do this by changing the way the colours are displayed rather than changing the original data (the original data can be somewhat complicated) - the best way of doing this that I could find is to extract the current ColorMap, apply its .reverse() method and re-apply that altered ColorMap. This feature seems to have been introduced in PyQtGraph 0.12.2 and has been working fine in my code in a small test script based on the PyQtGraph example code in ImageView.py. Essentially this:inv_cmap = imw.ui.histogram.gradient.colorMap()inv_cmap.reverse()imw.setColorMap(inv_cmap) Which does this nicely. I am subclassing pg.ImageView in my main code - the code I have been using works just fine in 0.12.1, but raises an odd exception in 0.12.2 and 0.12.3 (traceback included below.) So I want the ColorMap.reverse() method but I am unable to use 0.12.2 or .3... :( Can anyone help me here? I would like to fix the subclassing if possible, and then use the .reverse() ColorMap method. I am probably doing this wrong somewhere.If this is important, I am variably using PySide6, PySide2 and maybe PyQt 5 on old Macs where I have trouble installing PySide. These tracebacks were generated on PySide6, on Python 3.9.Here is minimum code which reproduces the issues:from PySide6.QtWidgets import QApplication, QMainWindow, QPushButtonfrom PySide6.QtWidgets import QWidget, QVBoxLayoutimport pyqtgraph as pgimport numpy as npimport sysclass MainWindow(QMainWindow): def __init__(self): super().__init__() self.cw = QWidget(self) self.cw.setAutoFillBackground(True) self.setCentralWidget(self.cw) self.layout = QVBoxLayout() self.cw.setLayout(self.layout) self.ImgWidget = MyImageWidget(parent=self) self.layout.addWidget(self.ImgWidget) self.inv_btn = QPushButton('Invert Image') self.inv_btn.clicked.connect(self.ImgWidget.invert_image) self.layout.addWidget(self.inv_btn) self.resize(800, 800) self.show()class MyImageWidget(pg.ImageView): def __init__(self, parent): super().__init__(parent, view=pg.PlotItem()) # Clean up the interface self.ui.histogram.hide() self.ui.roiBtn.hide() self.ui.menuBtn.hide() self.plot = self.getView() self.plot.hideAxis('left') self.plot.hideAxis('bottom') self.plot.setMenuEnabled(False) self.inverted = False # 300x200 img random noise img = np.random.normal(size=(300, 200)) self.setImage(img) self.def_cmap = self.ui.histogram.gradient.colorMap() self.inv_cmap = self.ui.histogram.gradient.colorMap() self.inv_cmap.reverse() def invert_image(self): self.inverted = not(self.inverted) if self.inverted: self.setColorMap(self.inv_cmap) else: self.setColorMap(self.def_cmap)def main(): app = QApplication(sys.argv) main = MainWindow() main.show() sys.exit(app.exec_())if __name__ == '__main__': main() in 0.12.2 and 0.12.3 the code fails on creation of the subclassed pg.ImageView - specifically the super statement.Traceback (most recent call last): File "c:/Users/oli_n/pycode/examview/test-reverse.py", line 71, in <module> main() File "c:/Users/oli_n/pycode/examview/test-reverse.py", line 65, in main main = MainWindow() File "c:/Users/oli_n/pycode/examview/test-reverse.py", line 20, in __init__ self.ImgWidget = MyImageWidget(parent=self) File "c:/Users/oli_n/pycode/examview/test-reverse.py", line 33, in __init__ super().__init__(parent, view=pg.PlotItem()) ...edit... File "c:\Users\oli_n\pycode\examview\.examview.env\lib\site-packages\pyqtgraph\graphicsItems\GradientEditorItem.py", line 642, in getGradient g.setStops([(x, QtGui.QColor(t.color)) for t,x in ticks])AttributeError: 'PySide6.QtGui.QLinearGradient' object has no attribute 'setStops'QPaintDevice: Cannot destroy paint device that is being paintedIn 0.12.1 the subclassing seems to work OK, however an exception is thrown when trying the .reverse() ColorMap method - of course this method is not implemented in 0.12.1, only 0.12.2 and later.Thanks!
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