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I created a custom QGraphicsItem and I am able to find the mouse position over the image by overriding the hoverMoveEvent.
How can I send that position data to a QLabel that is in my main window, that has my GraphicsView so that the label is always showing the pixel coordinates over the main label? Do I have to use a timer or something?
I would use the signal/slot mechanism of Qt to do this.
Declare a custom signal in your QGraphicsItem.
Connect your signal with the setNum or setText slot of the QLabel.
emit the signal after you read the mouse position.