customtracker.h

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/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
#ifndef CUSTOMTRACKER_H
#define CUSTOMTRACKER_H
 
#include <QEvent>
#include <QPointF>
#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*);
 
  ~CurveTracker();
 
  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);
 
  bool isEnabled() const;
 
  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