Excellent solution Patrick!
Thanks a lot
Salvatore
Il giorno martedì 7 dicembre 2021 alle 10:30:05 UTC+1 Patrick ha scritto:
> Hi,
>
> No problem. You just need to compare the objects to see if they refer to
> the same instance. So the simplest is something like:
> if r == rois[0]:
> print("First ROI")
>
> A better example is:
>
> import pyqtgraph as pg
>
> app = pg.mkQApp("Examples")
> win = pg.GraphicsLayoutWidget(show=True, size=(800,800), border=True)
> win.setWindowTitle('ROI Example')
>
> plot = win.addPlot()
> plot.setXRange(0,10)
> plot.setYRange(0,10)
>
> rois=[]
> rois.append(pg.ROI(pos=[3,5],size=[1,1]))
> rois.append(pg.ROI(pos=[7,5],size=[1,1]))
>
> def roi_changed(roi):
> global rois
> try:
> roi_i = rois.index(roi)
> print(f"ROI #{roi_i} at {roi.pos()}")
> except:
> print("Unknown ROI!")
>
>
> for roi in rois:
> plot.addItem(roi)
> roi.sigRegionChangeFinished.connect(roi_changed)
>
> pg.exec()
>
> On Tuesday, 7 December 2021 at 7:41:51 pm UTC+10:30 [email protected]
> wrote:
>
>> Hi Patrick and all,
>>
>> Thanks for the quick answer!
>>
>> Your modification works, but still it does not answer my doubt: I
>> understood that the function that I pass to "connect" assumes to have as
>> argument the ROI itself, but what you suggest give me back the position of
>> the ROI that I moved... true, however I don't know yet WHICH I moved.
>> Having the print of the position, it simply tells me that ONE of them (but
>> not WHICH of them) has reached that position.
>> Is there a way to give some "attribute" to the ROI, like a name or ID, so
>> that the ROI that I moved can pass me back such identifier?
>>
>> Thanks
>> Salvatore
>>
>> Il giorno martedì 7 dicembre 2021 alle 03:24:53 UTC+1 Patrick ha scritto:
>>
>>> Hi,
>>>
>>> I'm pretty sure when the signals are emitted, they also pass a reference
>>> to the ROI which triggered the signal. It's not clear from the
>>> documentation, but can see it in the underlying code for the ROI (
>>> https://pyqtgraph.readthedocs.io/en/latest/_modules/pyqtgraph/graphicsItems/ROI.html#ROI.stateChanged).
>>>
>>> So try changing the connect() line to something like:
>>>
>>> roi.sigRegionChangeFinished.connect(lambda r: print(r.pos()))
>>>
>>> and see if that works.
>>>
>>> Patrick
>>> On Tuesday, 7 December 2021 at 5:47:06 am UTC+10:30 [email protected]
>>> wrote:
>>>
>>>> Hi all,
>>>>
>>>> I am a beginner, so I hope not to post too trivial question, but I am
>>>> trying to understand how to do the following: assume I have defined two
>>>> ROIs and I set the event to print "Hi" when I finish to move a ROI.
>>>> I am able to print "Hi" when I move ANY of the two ROIs, but how can
>>>> recognize WHICH ROI I moved? Like printing "Hi I moved ROI N. 1" or "Hi I
>>>> moved ROI N. 2" ?
>>>>
>>>> Here a simple code to explain better my question:
>>>>
>>>> import pyqtgraph as pg
>>>>
>>>> app = pg.mkQApp("Examples")
>>>> win = pg.GraphicsLayoutWidget(show=True, size=(800,800), border=True)
>>>> win.setWindowTitle('ROI Example')
>>>>
>>>> plot = win.addPlot()
>>>> plot.setXRange(0,10)
>>>> plot.setYRange(0,10)
>>>>
>>>> rois=[]
>>>> rois.append(pg.ROI(pos=[3,5],size=[1,1]))
>>>> rois.append(pg.ROI(pos=[7,5],size=[1,1]))
>>>>
>>>> for roi in rois:
>>>> plot.addItem(roi)
>>>> roi.sigRegionChangeFinished.connect(lambda: print('Hi'))
>>>>
>>>> pg.exec()
>>>>
>>>> Thanks in advance for any help
>>>> Salvatore
>>>>
>>>
--
You received this message because you are subscribed to the Google Groups
"pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/pyqtgraph/6418924c-872b-49eb-b2a0-e194b19616e1n%40googlegroups.com.
