Check out example codes for "qt graphics scene map cursor position". It will help you in understanding the concepts better.

Code Example 1

QPoint viewPoint = ui->graphicsView->mapFromGlobal(QCursor::pos());
QPointF scenePoint = ui->graphicsView->mapToScene(viewPoint);
myWidget->setPos(scenePoint);

Learn ReactJs, React Native from akashmittal.com