plotinstancesampler.h

//
// author Kazys Stepanas
//
// Copyright (c) CSIRO 2015
//
#ifndef PLOTINSTANCESAMPLER_H_
#define PLOTINSTANCESAMPLER_H_

#include "plotsconfig.h"

#include "qwt_series_data.h"

class PlotInstance;

class PlotInstanceSampler : public QwtSeriesData<QPointF>
{
public:
  PlotInstanceSampler(const PlotInstance *curveData);

  void setCurve(const PlotInstance *curveData);

  inline const PlotInstance *curve() const { return _curve; }

  size_t size() const override;

  QPointF sample(size_t i) const override;

  QRectF boundingRect() const override;

  void invalidateBoundingRect();

  QRectF calculateBoundingRect(size_t from = 0, size_t to = ~(size_t)(0u)) const;

private:
  double lookupSampleTime(double initialTime, size_t i) const;

  const PlotInstance *_curve;   
  mutable QRectF _boundingRect; 
  mutable size_t _lastRingHead; 
  mutable size_t _lastRingSize; 
};

#endif // PLOTINSTANCESAMPLER_H_