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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