customtracker.h

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#ifndef CUSTOMTRACKER_H
#define CUSTOMTRACKER_H

#include <QEvent>
#include "qwt_plot_picker.h"
#include "qwt_picker_machine.h"
#include "qwt_plot_marker.h"

class QwtPlotCurve;


class CurveTracker: public QObject
{
    Q_OBJECT
public:
    explicit CurveTracker(QwtPlot * );

    QPointF actualPosition() const;

    typedef enum {
        LINE_ONLY,
        VALUE,
        VALUE_NAME
    }Parameter;

public slots:

    void setPosition(const QPointF & pos);

    void setParameter(Parameter par);

    void setEnabled(bool enable);

    void redraw()
    {
        setPosition(_prev_trackerpoint);
    }

private:
    QLineF  curveLineAt( const QwtPlotCurve *, double x ) const;

    QPointF transform( QPoint);

    QPoint  invTransform( QPointF);

    QPointF _prev_trackerpoint;
    std::vector<QwtPlotMarker*> _marker;
    QwtPlotMarker* _line_marker;
    QwtPlotMarker* _text_marker;
    QwtPlot* _plot;
    Parameter _param;
    bool _visible;

};

#endif // CUSTOMTRACKER_H