GoldenCheetah/qwt/examples/cpuplot/cpuplot.h

#include <qwt_plot.h>
#include "cpustat.h"

#define HISTORY 60 // seconds

class QwtPlotCurve;

class CpuPlot : public QwtPlot 
{
    Q_OBJECT
public:
    enum CpuData
    {
        User,
        System,
        Total,
        Idle,

        NCpuData
    };

    CpuPlot(QWidget * = 0);
    const QwtPlotCurve *cpuCurve(int id) const
        { return data[id].curve; }

protected:
    void timerEvent(QTimerEvent *e);

private slots:
    void showCurve(QwtPlotItem *, bool on);

private:
    struct
    {
        QwtPlotCurve *curve;
        double data[HISTORY];
    } data[NCpuData];
    double timeData[HISTORY];

    int dataCount;
    CpuStat cpuStat;
};