QChart only zoom the X axis

[Deneguil]

Hello, I am currently making a scatter chart which needs to be zoomable on the X axis only. So far I have this code that I've adapted from the zoomline example

mapChart::mapChart(QGraphicsItem* parent, Qt::WindowFlags wFlags)
    : QChart(parent, wFlags)
{
    grabGesture(Qt::PanGesture);
    grabGesture(Qt::PinchGesture);
}

bool mapChart::sceneEvent(QEvent *event) {
    if(event->type() == QEvent::Gesture)
        return gestureEvent(static_cast<QGestureEvent*>(event));

    if(event->type() == QEvent::GraphicsSceneMouseDoubleClick){
        QChart::zoomReset();
        return true;
    }

    return QChart::event(event);
}

bool mapChart::gestureEvent(QGestureEvent *event) {
    if(QGesture * gesture = event->gesture(Qt::PanGesture)) {
        QPanGesture * pan = static_cast<QPanGesture*>(gesture);
        QChart::scroll(-(pan->delta().x()), 0);
    }

    if(QGesture * gesture = event->gesture(Qt::PinchGesture)) {
        QPinchGesture * pinch = static_cast<QPinchGesture*>(gesture);
        if(pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
            QChart::zoom(pinch->scaleFactor());
    }
    return true;
}

However it also zooms the Y axis which I don't want. I've thought about overriding the zoom method and calculating the correct range for the X axis myself but then I'd need to do something similar to the pan which I'd like to avoid if possible.

Is there a way to only zoom on the X axis without overriding the zoom() method ?
Thank you