xyseriesiodevice.h 范例文件

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#ifndef XYSERIESIODEVICE_H
#define XYSERIESIODEVICE_H
#include <QtCore/QIODevice>
#include <QtCore/QPointF>
#include <QtCore/QVector>
#include <QtCharts/QChartGlobal>
QT_CHARTS_BEGIN_NAMESPACE
class QXYSeries;
QT_CHARTS_END_NAMESPACE
QT_CHARTS_USE_NAMESPACE
class XYSeriesIODevice : public QIODevice
{
    Q_OBJECT
public:
    explicit XYSeriesIODevice(QXYSeries *series, QObject *parent = nullptr);
    static const int sampleCount = 2000;
protected:
    qint64 readData(char *data, qint64 maxSize) override;
    qint64 writeData(const char *data, qint64 maxSize) override;
private:
    QXYSeries *m_series;
    QVector<QPointF> m_buffer;
};
#endif // XYSERIESIODEVICE_H