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PySide2: Understanding QGraphicsItemGroup.setScale()
galou_breizh last edited by galou_breizh
Here is a little example that doesn't do what I expect it to do. I expect a 50x50 px² circle at (500, 1000) px. What I get is a single pixel.
#!/usr/bin/python3 # -*- coding: utf-8 -*- """Show an incomprehension in setScale for QGraphicsItemGroup.""" from PySide2 import QtCore from PySide2 import QtGui from PySide2 import QtWidgets point_size = 0.1 # In real-world units. # Get entrypoint through which we control underlying Qt framework app = QtWidgets.QApplication() scene = QtWidgets.QGraphicsScene() group = QtWidgets.QGraphicsItemGroup() scale = 500 # 1 real-world units = 500 px. !! Has no apparent effect. group.setScale(scale) pen = QtGui.QPen(QtCore.Qt.red) brush = QtGui.QBrush(QtCore.Qt.blue) x = 1 # Real-world units. y = 2 # Real-world units. top_left = (x - point_size / 2, y - point_size / 2) ellipse = QtWidgets.QGraphicsEllipseItem( QtCore.QRectF(*top_left, point_size, point_size)) ellipse.setPen(pen) ellipse.setBrush(brush) group.addToGroup(ellipse) scene.addItem(group) view = QtWidgets.QGraphicsView(scene) view.show() # Start Qt/PySide2 application. If we don't show any windows, the # app would just loop at this point without the means to exit app.exec_()
Gojir4 last edited by Gojir4
Hi @galou_breizh ,
It seems it works (windows) after moving
Edit: It works also by putting the scale on the
galou_breizh last edited by
Thanks for the super-quick answer!
Ok, I don't get it but the result is now different. However, it's still not the correct result. What I get is something between a circle and a square with red stroke (size 500x500 px²) filled with white color with a 50x50 px² blue circle in the middle . The same as in my other post: https://forum.qt.io/topic/110762/pyside2-filling-not-scaled#
Gojir4 last edited by
@galou_breizh I answered in the other post. But it's not a good way to duplicate post for the same issue. Please try to avoid it in the future, thanks