#include "InteractiveChartView.h"

void InteractiveChartView::wheelEvent(QWheelEvent* event)
{
    qreal factor;
    if (event->delta() > 0)
        factor = 2.0;
    else
        factor = 0.5;

    QRectF r = QRectF(chart()->plotArea().left(),
                      chart()->plotArea().top(),
                      chart()->plotArea().width() / factor,
                      chart()->plotArea().height() / factor);
    QPointF mousePos = mapFromGlobal(QCursor::pos());
    r.moveCenter(mousePos);
    chart()->zoomIn(r);
    QPointF delta = chart()->plotArea().center() - mousePos;
    chart()->scroll(delta.x(), -delta.y());

    QChartView::wheelEvent(event);
}