tennisview.cpp Example File

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 #include "tennisview.h"

 #include <QMouseEvent>

 TennisView::TennisView(QWidget *parent) :
     QGraphicsView(parent)
 {
 }

 void TennisView::mousePressEvent(QMouseEvent *event)
 {
     QPointF p = mapToScene(event->x(), event->y());
     emit mousePress(p.x(), p.y());
     emit mouseMove(p.x(), p.y());
     last_y = p.y();
 }

 void TennisView::mouseMoveEvent(QMouseEvent *event)
 {
     if (event->buttons()) {
         QPointF p = mapToScene(event->x(), event->y());
         if (10 < abs(last_y - event->y())) {
 //            emit mouseMove(p.x(), p.y());
             last_y = p.y();
         }
     }
 }