Hi,
I am having issues with using the imageview roi when imageAxisOrder is set
to row-major. The values that get sampled are wrong. I made a test-file
that I attached in which I compare the plots that I get from the roi in the
original file, and a modified plot. (PS: you have to manually enlarge the
plot in the red-custom plot window)
The axes values need to be different in order for the roi to display the
correct image.
Moreover I get data values from where the rectangle would have been drawn
if I did not have the row-major config settings.
So the question:
Is this a bug or is there another way to do this ?
--
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/897e9ef3-6524-43a3-8622-d06db264d68d%40googlegroups.com.
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph.graphicsItems.ROI as rois
import sys
from pyqtgraph.imageview.ImageView import *
import pyqtgraph as pg
def newROI_CHG_ROI(chROI: ROI, iv: ImageView):
darray = iv.image.view(np.ndarray)
print(iv.axes['x'], iv.axes['y'])
ar = chROI.getArrayRegion(darray, iv.getImageItem(), axes=[1, 2])
print(ar.shape)
ar = ar.mean(axis=2)
ar = ar.mean(axis=1)
iv.roiCurves.clear()
iv.getRoiPlot().plotItem.clear()
iv.roiCurves.append(iv.ui.roiPlot.plot(pen=pg.mkPen(color='r')))
iv.roiCurves[len(iv.roiCurves) - 1].setData(x=iv.tVals, y=ar)
if __name__ == '__main__':
app = QtGui.QApplication()
pg.setConfigOptions(imageAxisOrder='row-major') # todo check if this is still needed
iv = ImageView(name="Modified")
unchangedIv = ImageView(name="Unchanged")
# make data
#each frame of the timeline is a rectangle filled with same values
d1 = np.full((100, 200), 400)
d2 = np.full((100, 200), 250)
d3 = np.full((100, 200), 10)
f1 = np.dstack((d1, d3))
f1 = np.dstack((f1, d2))
data = f1.T
#
iv.setImage(data)
iv.roiClicked()
chROI = rois.ROI([50, 50], pen=pg.mkPen(color='r'))
chROI.addTranslateHandle([0, 0])
iv.view.addItem(chROI)
chROI.setZValue(20)
iv.roi = chROI
chROI.sigRegionChanged.connect(lambda r=chROI, i=iv: newROI_CHG_ROI(chROI, iv))
# chROI.sigRegionChanged.connect(iv.roiChanged)
unchangedIv.setImage(data)
iv.show()
unchangedIv.show()
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
