plotmagnifier.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 PLOTMAGNIFIER_H
#define PLOTMAGNIFIER_H
 
#include <QTimer>
#include "qwt_plot_magnifier.h"
#include "qwt_plot.h"
#include <QEvent>
 
class PlotMagnifier : public QwtPlotMagnifier
{
  Q_OBJECT
 
public:
  explicit PlotMagnifier(QWidget* canvas);
  virtual ~PlotMagnifier() override;
 
  void setAxisLimits(int axis, double lower, double upper);
  virtual void widgetWheelEvent(QWheelEvent* event) override;
 
  enum AxisMode
  {
    X_AXIS,
    Y_AXIS,
    BOTH_AXES
  };
 
  virtual void rescale(double factor) override
  {
    rescale(factor, _default_mode);
  }
 
  void setDefaultMode(AxisMode mode)
  {
    _default_mode = mode;
  }
 
  void rescale(double factor, AxisMode axis);
 
protected:
  virtual void widgetMousePressEvent(QMouseEvent* event) override;
 
  double _lower_bounds[QwtPlot::axisCnt];
  double _upper_bounds[QwtPlot::axisCnt];
 
  QPointF _mouse_position;
 
signals:
  void rescaled(QRectF new_size);
 
private:
  QPointF invTransform(QPoint pos);
  QTimer _future_emit;
  AxisMode _default_mode;
};
 
#endif  // PLOTMAGNIFIER_H