Hi guys:
Thank you so much for your helpful discussion! I'm also a new guy to
pyqtgraph and trying to find a way to get binary ROI, but when I ran the
attached testROI.py, an error occurs:
'''
Traceback (most recent call last):
File "testROI.py", line 37, in <module>
mpossx = roi.getArrayRegion(possx,imgview).astype(int)
File
"D:\Program\Miniconda3\envs\bs\lib\site-packages\pyqtgraph\graphicsItems\ROI.py",
line 2027, in getArrayRegion
sliced = ROI.getArrayRegion(self, data, img, axes=axes,
fromBoundingRect=True, **kwds)
File
"D:\Program\Miniconda3\envs\bs\lib\site-packages\pyqtgraph\graphicsItems\ROI.py",
line 1104, in getArrayRegion
shape, vectors, origin = self.getAffineSliceParams(data, img, axes,
fromBoundingRect=fromBR)
File
"D:\Program\Miniconda3\envs\bs\lib\site-packages\pyqtgraph\graphicsItems\ROI.py",
line 1129, in getAffineSliceParams
raise Exception("ROI and target item must be members of the same
scene.")
Exception: ROI and target item must be members of the same scene.
'''
I guess it is because the function 'ROI.getArrayRegion' has been
changed/updated over the years. But as a newbie, I don't quite understand
how to fix it ... Could you please give me some suggestions? Thank you very
much!!
Best,
Xingyu
在 2015年5月18日星期一 UTC+8下午11:50:20，Julien Lhermitte写道：
>
> Great I'm glad to hear this! Thanks for the information by the way, I
> didn't know you could do this but it's a great feature to have (add a
> function to a class after the fact just like you can do with attributes).
>
> I'm not sure which way is more pythonic but I would still rather create a
> new class with this new method that inherits all methods members of the ROI
> class used in the long run. This might make things easier to keep track of.
> If you're not familiar, look up inheritance (like here
> <http://www.jesshamrick.com/2011/05/18/an-introduction-to-classes-and-inheritance-in-python/>),
>
> it's pretty simple to implement. But this is a nice quick fix.
>
> On Monday, May 18, 2015 at 3:32:31 AM UTC-4, L. Smash wrote:
>>
>> Hi,
>>
>> thanks for the nice example! I think I've got it now :)
>>
>> What I actually was trying to do is to put your code into a
>> function/method (like getArrayRegion) and dynamically add it to ROI classes
>> of pyqtgraph (PolyLineROI, Ellipse.ROI etc.). The problem I stumbled across
>> was an issue with bound\unbound methods (see here
>> <http://www.ianlewis.org/en/dynamically-adding-method-classes-or-class-instanc>),
>>
>> that's why I got confused with the self variable. Thanks again for your
>> explanation and the example, it helped me very much!
>>
>> Best,
>> Lars
>>
>> Am Freitag, 15. Mai 2015 16:45:27 UTC+2 schrieb Julien Lhermitte:
>>>
>>> oops the dimensions were wrong (ROI went out of bounds of data array), I
>>> have reattached the correct example.
>>>
>>> Also, the *self* variable in my previous example would be the
>>> *theObjectCallingIt* in my current example. It can have whatever name
>>> you want.
>>>
>>> (doing this on my spare time here and there :-( but hope it helps)
>>>
>>>
>>> On Friday, May 15, 2015 at 9:40:12 AM UTC-4, Julien Lhermitte wrote:
>>>>
>>>> Hi,
>>>>
>>>> I am not completely sure I understand your question but I think
>>>> your concern is the self variable. Yes, this was just a quick snippet I
>>>> copied and pasted.
>>>> First, I believe whenever you call a function in an object, the first
>>>> parameter given is always a reference to the object itself.
>>>>
>>>> So if tiger is part of class Cat, and has member function getColor(),
>>>> this function:
>>>> tiger.getColor() is actually a shortcut for Cat.getColor(tiger), so
>>>> when declaring a function in a class, the function should be declared as:
>>>>
>>>> def getColor(theObjectCallingIt, otherparameters...):
>>>>
>>>> But let's ignore that for now and just create some self contained code.
>>>> I have attached it in this message. It generates random data but it's
>>>> always a good idea to use some sort of image with features to test (just
>>>> uncomment the relevant lines for that and install PIL image lib for
>>>> example)
>>>>
>>>> I hope this helps!
>>>>
>>>> julien
>>>>
>>>>
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