Method mouseMoveEvent

graph_view.cpp:135–147

}

void MyGraphicsView::mouseMoveEvent(QMouseEvent *event){
    if(onMiddlePress){
        QPointF dp = mapToScene(event->pos()) - lastPos;
        setSceneRect(sceneRect().x() - dp.x(), sceneRect().y() - dp.y(), sceneRect().width(), sceneRect().height());
        lastPos = mapToScene(event->pos());
    }
    changeCursor();
    emit mouseMoved(mapToScene(event->pos()));
    if(itemState & ADD){
        clearSketch();
        sketchLine(strtVex->scenePos() + strtVex->rect().center(), mapToScene(event->pos()));
    }
}

void MyGraphicsView::wheelEvent(QWheelEvent *event){
    QPointF cursorPoint = event->position();