unsigned int numOfSamples;

    unsigned int numOfChannels;

    QList<QwtPlotCurve*> curves;

    typedef QVector<double> DataArray;

    DataArray dataX;   // array that simply contains numbers 0..numberOfSamples

    QList<DataArray> channelsData;

    // `data` contains i th channels data

    void addChannelData(unsigned int channel, DataArray data);

    Zoomer* zoomer;

    NumberFormat numberFormat;

    unsigned int sampleSize; // number of bytes in the selected number format

    double (MainWindow::*readSample)();

    // note that serialPort should already have enough bytes present

    template<typename T> double readSampleAs();

    bool skipByteRequested;

    const int SPS_UPDATE_TIMEOUT = 1;  // second

    QLabel spsLabel;

    void skipByte();

    void onNumOfSamplesChanged(int value);

    void onAutoScaleChecked(bool checked);

    void onYScaleChanged();

    void onNumOfChannelsChanged(int value);

    void onNumberFormatButtonToggled(int numberFormatId, bool checked);

    void selectNumberFormat(NumberFormat numberFormatId);

    void clearPlot();

    void spsTimerTimeout();

    void demoTimerTimeout();

    void enableDemo(bool enabled);

    void onExportCsv();

};

#endif // MAINWINDOW_H