1 void getPoint(QwtPlot *plot)2 {3       QPoint point = plot->canvas()->mapFromGlobal(QCursor::pos());   4       QString info.sprintf("x = %g, y = %g",5                      plot ->invTransFrom(Qwtplot::xBottom,point.x()),6                      plot ->invTransFrom(Qwtplot::yLeft,point.y() 7                       );   8 }