Hi Ogi,
if I understand well you need to make some modification to the code.
However I think that in my particular case I can still get rid of the
problem using the modification of the code reported below. It seems that it
works as well for pg.Point or QtCore.QPointF
def roi_changed(roi):
Handles=roi.getLocalHandlePositions() # Get list of handles
for h in Handles:
position=h[1]
print(f'point = ({position.x():.4f},{position.y():.4f})')
#-------------------------------------------------------------------
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)
roi=pg.PolyLineROI([[5.0,2], [6.0, 2], [6.0, 5]], pen=(6,9), closed=False)
plot.addItem(roi)
roi.sigRegionChangeFinished.connect(lambda roi: roi_changed(roi))
print('Print Handles position as they are created')
Handles=roi.getLocalHandlePositions() # Get list of handles
for h in Handles: # Print handles position
position=h[1]
print(f'point = ({position.x():.4f},{position.y():.4f})')
print('... Then when I move one handle...')
pg.exec()
Do you agree?
thanks
Salvatore
Il giorno giovedì 9 dicembre 2021 alle 21:42:05 UTC+1 [email protected]
ha scritto:
> Hi Salvatore,
>
> This one took me a bit to debug! Pro-tip, if using breakpoint() use the
> pyside bindings, not the PyQt ones.
>
> Issue is in the ROI.movePoint; or more specifically
> QGraphicsItem.mapFromScene which takes a pg.Point as input, but returns a
> QtCore.QPointF; easiest fix would be to modify the method such that
> `h['pos'] = Point(newPos)` in the movePoint method of the ROI class.
>
> elif h['type'] == 'f':
> newPos = self.mapFromParent(p1)
> h['item'].setPos(newPos)
> h['pos'] = Point(newPos)
> self.freeHandleMoved = True
>
> At a glance, I'm not sure if there are some other code-paths that would
> suffer a similar issue.
>
> On Thu, Dec 9, 2021 at 11:39 AM Salvatore Lorusso <[email protected]>
> wrote:
>
>> Hi all,
>>
>> I appreciate if someone has an answer to the following issue.
>> Please consider the following code:
>>
>> def roi_changed(roi):
>>
>> Handles=roi.getLocalHandlePositions() # Get list of handles
>> for h in Handles:
>> position=h[1]
>> print(position)
>> print('try to print X position')
>> print(position[0])
>>
>> #-------------------------------------------------------------------
>> 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)
>>
>> roi=pg.PolyLineROI([[5.0,2], [6.0, 2], [6.0, 5]], pen=(6,9), closed=False)
>> plot.addItem(roi)
>>
>> roi.sigRegionChangeFinished.connect(lambda roi: roi_changed(roi))
>>
>> print('Print Handles position as they are created')
>> Handles=roi.getLocalHandlePositions() # Get list of handles
>> for h in Handles: # Print handles position
>> position=h[1]
>> print(position)
>>
>> print('... Then when I move one handle...')
>>
>> pg.exec()
>>
>> Initially the code will print the positions of the three handles as
>> following
>> Point(5.000000, 2.000000)
>> Point(6.000000, 2.000000)
>> Point(6.000000, 5.000000)
>>
>> but when I move one of the handles, so that the "roi_changed" function is
>> activated by the event, the handle that I move changes its "nature" and
>> when I print its position I get:
>> PyQt5.QtCore.QPointF(6.5, 2.9)
>> instead of
>> Point(6.5, 2.9)
>>
>> the problem is that I want to extract the X position and while the
>> position=Point(5,2) is subscriptable, so that position[0]=5
>> I cannot do the same to extract X position from PyQt5.QtCore.QPointF
>>
>> In fact you will see that my code fails
>>
>> I hope you can help to find a way to extract X position in all the cases
>>
>> thanks
>> Salvatore
>>
>>
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