qt-everywhere-src-5.14.1/qtcharts/tests/manual/polarcharttest/chartview.cpp

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#include "chartview.h"
#include <QtGui/QMouseEvent>
#include <QtCore/QDebug>
#include <QtCharts/QAbstractAxis>

QT_CHARTS_USE_NAMESPACE

ChartView::ChartView(QWidget *parent) :
    QChartView(parent)
{
}

void ChartView::keyPressEvent(QKeyEvent *event)
{
    switch (event->key()) {
    case Qt::Key_Plus:
        chart()->zoomIn();
        break;
    case Qt::Key_Minus:
        chart()->zoomOut();
        break;
    case Qt::Key_Left:
        chart()->scroll(-1.0, 0);
        break;
    case Qt::Key_Right:
        chart()->scroll(1.0, 0);
        break;
    case Qt::Key_Up:
        chart()->scroll(0, 1.0);
        break;
    case Qt::Key_Down:
        chart()->scroll(0, -1.0);
        break;
    default:
        QGraphicsView::keyPressEvent(event);
        break;
    }
}