Hi-
I am trying to display 2D and 3D image datasets within an ImageView, with
some metadata being displayed in the window corners (such as min/max
intensity levels as per setLevels() method etc).
I expect these values to change during viewing so was hoping a
straightforward way of doing so.
The best way I can see so far is to use the legendItem, however I can't
find a way to prevent the user being able to click & drag it, and editing
the text is a bit of a pain (seems like you have to use
legend.getLabel(my_view) to get the label object to then setText().
Awkward.)
Alternatively, the LabelItem seems easier to change text, but:
1- I can't find a way to consistently locate the text relative to the
window- it always moves when I pan/zoom.
2- I can't see how to get the correct coords relative to the window. I
tried the mapToScene(), though I can't see a difference in behaviour
compared to when I use mapFromScene() which leads me to believe I am not
using the QGraphicsView object but something else...
Is there a way to fix text position on the screen so that it doesn't move
with pan/zoom?
Sample code below, with sample legend, textItem and labelItem. The
labelItem moves and even zooms with the image. The textItem moves with the
image.
How can I:
1- set Legend location
2- prevent the user moving the legend?
Thanks!
from PySide2.QtWidgets import QApplication
from PySide2.QtWidgets import QMainWindow
from PySide2.QtWidgets import QWidget
from PySide2.QtWidgets import QHBoxLayout
import pyqtgraph as pg
import numpy as np
import sys
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.cw = QWidget(self)
self.cw.setAutoFillBackground(True)
self.setCentralWidget(self.cw)
self.layout = QHBoxLayout()
self.cw.setLayout(self.layout)
self.DcmImgWidget = MyImageWidget(parent=self)
self.layout.addWidget(self.DcmImgWidget)
self.show()
class MyImageWidget(pg.ImageView):
def __init__(self, parent):
super().__init__(parent, view=pg.PlotItem())
self.ui.histogram.hide()
self.ui.roiBtn.hide()
self.ui.menuBtn.hide()
plot_view = self.getView()
plot_view.hideAxis('left')
plot_view.hideAxis('bottom')
# 50 frames of 100x100 random noise
img = np.random.normal(size=(50, 100, 100))
self.setImage(img)
plot_view.addItem(pg.LabelItem("this is a nice label"))
text1 = pg.TextItem(text='text1', color=(0, 128, 0))
plot_view.addItem(text1)
text1.setPos(75, -20)
legend = plot_view.addLegend()
style = pg.PlotDataItem(pen='w')
legend.addItem(style, 'legend')
def main():
app = QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
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