plotzoomer.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 PLOTZOOMER_H
#define PLOTZOOMER_H
 
#include <QObject>
#include <QPoint>
#include <QDebug>
#include "qwt_plot_zoomer.h"
 
class PlotZoomer : public QwtPlotZoomer
{
public:
  PlotZoomer();
 
  explicit PlotZoomer(QWidget*);
 
  virtual ~PlotZoomer() override = default;
 
  void keepAspectRatio(bool doKeep)
  {
    _keep_aspect_ratio = doKeep;
  }
 
protected:
  virtual void widgetMousePressEvent(QMouseEvent* event) override;
  virtual void widgetMouseReleaseEvent(QMouseEvent* event) override;
  virtual void widgetMouseMoveEvent(QMouseEvent* event) override;
  virtual bool accept(QPolygon&) const override;
 
  virtual void zoom(const QRectF& rect) override;
 
  virtual QSizeF minZoomSize() const override;
 
private:
  bool _mouse_pressed;
  bool _zoom_enabled;
  bool _keep_aspect_ratio;
  QPoint _initial_pos;
};
 
#endif  // PLOTZOOMER_H