Hello, I finally managed to make it work with your help.
[image: sdsds.png]
The solution was:
Into qt Designer:
1. create a QWidget at the point where HistogramLUTWidget will appear
2. right click and promote it
3. set Promoted Class Name: HistogramLUTWidget
set Promoted Class Header: pyqtgraph.widgets.HistogramLUTWidget
4.save it
5. In my code I removed the first line of code and left the second one
#self.wu = self.findChild(HistogramLUTWidget, 'wu') #--> removed
self.wu = pg.HistogramLUTWidget(fillHistogram=False)
everything worked!
Thank you for your time!
Τη Πέμπτη, 23 Ιουλίου 2020 - 11:51:13 μ.μ. UTC+3, ο χρήστης Erik J έγραψε:
>
> If you still get an import error, you might have to try this for the
> header name: pyqtgraph.widgets.HistogramLUTWidget
>
> That works directly importing from a python terminal session:
>
> >>> import pyqtgraph.widgets.HistogramLUTWidget
> >>>
>
> On Thu, Jul 23, 2020 at 2:26 PM Erik Johansson <[email protected]
> <javascript:>> wrote:
>
>> You have to use the exact name of the python module for the header,
>> without the .py extension. It is case sensitive. You can find the name of
>> the module in the python site packages dir for your distribution. For
>> example on my machine it is
>> here:
>> /home/erikj/.local/lib/python3.8/site-packages/pyqtgraph/widgets/HistogramLUTWidget.py
>>
>> In this case the header name should be "HistogramLUTWidget". Try that and
>> see if it works.
>>
>> Regards,
>> Erik
>>
>>
>>
>> On Thu, Jul 23, 2020 at 2:04 PM pilkrow slash <[email protected]
>> <javascript:>> wrote:
>>
>>> Sorry if there was a display problem with the previous screenshot.
>>> I attach a new one with the recommended changes.
>>> I removed the .h extension
>>>
>>> [image: screensht4.png]
>>>
>>>
>>> and I use the same code
>>> self.wu = self.findChild(HistogramLUTWidget, 'wu')
>>> self.wu = pg.HistogramLUTWidget(fillHistogram=False)
>>>
>>> After I get the error: ModuleNotFoundError: No module named
>>> 'histogramlutwidget'
>>>
>>> Τη Πέμπτη, 23 Ιουλίου 2020 - 9:57:26 μ.μ. UTC+3, ο χρήστης Erik J έγραψε:
>>>>
>>>> So this is where there is a slight disconnect in the way that
>>>> QtCreator/Designer auto fills the name of the header file. You should use
>>>> the name of the actual python file without the ".py". In this case that
>>>> would be "HistogramLUTWidget". Do not use the ".h" suffix. I think
>>>> QtCreateor/Designer fills that in automatically for a C++ header file.
>>>>
>>>> Hope that helps.
>>>> Erik
>>>>
>>>> On Thu, Jul 23, 2020 at 12:35 PM pilkrow slash <[email protected]>
>>>> wrote:
>>>>
>>>>> Hello, so I first create a qwidget which I promote to
>>>>> HistogramLUTWidget, right?
>>>>> In the dialog window I choose the base class name as "QWidget"
>>>>> the Promoted class name to "HistogramLUTWidget"
>>>>> Do I use the pyqtgraph.h as Header File or I have to use another one?
>>>>> I attached a snapshot of qt designer.
>>>>> The qwidget is called wu.
>>>>>
>>>>> [image: Screenshot from 2020-07-23 21-29-31.png]
>>>>>
>>>>>
>>>>> Finally I have to insert the widget into my code:
>>>>>
>>>>>
>>>>> uic.loadUi(‘CEtb26.ui’, self)
>>>>>
>>>>> self.wu = self.findChild(HistogramLUTWidget, 'wu')
>>>>> self.wu = pg.HistogramLUTWidget(fillHistogram=False)
>>>>>
>>>>>
>>>>>
>>>>> Is it correct?
>>>>>
>>>>> Best regards
>>>>>
>>>>> Τη Πέμπτη, 23 Ιουλίου 2020 - 7:37:51 μ.μ. UTC+3, ο χρήστης Erik J
>>>>> έγραψε:
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I have done this a few times. To make it work, I use a QWidget for
>>>>>> the histogram display which I then promote to a pyqtgraph
>>>>>> HistogramLutWidget. Try changing your QGraphics widget to be a QWidget
>>>>>> then
>>>>>> promote it to a HistogramLUTWidget. I think if you do that the rest
>>>>>> should
>>>>>> work fine.
>>>>>>
>>>>>> Regards,
>>>>>> Erik
>>>>>>
>>>>>> On Thu, Jul 23, 2020 at 8:58 AM pilkrow slash <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> Hello, I have little experience about pyqtgraph and sometimes simple
>>>>>>> things look difficult.
>>>>>>> What I'm looking for is to display a histogramLUT widget into a gui
>>>>>>> created using qt Designer.
>>>>>>> I import the .ui file but I don't know how I can insert it into my
>>>>>>> code and connect it with an imageItem.
>>>>>>>
>>>>>>> [image: scrnsht1.png]
>>>>>>>
>>>>>>> [image: scrnsht0.png]
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> class MainWindow(QMainWindow, ProcessDicom):
>>>>>>> …
>>>>>>> …
>>>>>>> uic.loadUi(‘CEtb26.ui’, self)
>>>>>>> …
>>>>>>> …
>>>>>>> self.im1 = pg.ImageItem(img,levels=[0, 255])
>>>>>>> self.histWindow = self.findChild(PlotWidget, ‘wu’)
>>>>>>> self.histWindow.setImageItem(self.im1)
>>>>>>>
>>>>>>>
>>>>>>> but the only thing I get is an empty plot!
>>>>>>>
>>>>>>>
>>>>>>> Thank you for your time.
>>>>>>>
>>>>>>>
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