series_data.h

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#ifndef SERIES_DATA_H
#define SERIES_DATA_H

#include "PlotJuggler/plotdata.h"
#include "qwt_series_data.h"

class DataSeriesBase: public QwtSeriesData<QPointF>
{

public:
    DataSeriesBase(const PlotData* transformed):
        _transformed_data(transformed),
        _time_offset(0)
    {}

    virtual QPointF sample( size_t i ) const override
    {
        const auto& p = _transformed_data->at(i);
        return QPointF(p.x - _time_offset, p.y);
    }

    virtual size_t size() const override
    {
        return _transformed_data->size();
    }

    QRectF boundingRect() const override
    {
        QRectF box = _bounding_box;
        box.setLeft(  _bounding_box.left()  - _time_offset );
        box.setRight( _bounding_box.right() - _time_offset );
        return box;
    }

    void setTimeOffset(double offset)
    {
        _time_offset = offset;
    }


    void calculateBoundingBox();

    virtual PlotData::RangeValueOpt getVisualizationRangeY(PlotData::RangeTime range_X) = 0;

    virtual nonstd::optional<QPointF> sampleFromTime(double t) = 0;

    virtual bool updateCache() = 0;

    virtual PlotData::RangeTimeOpt getVisualizationRangeX()
    {
        if( this->size() < 2 )
            return  PlotData::RangeTimeOpt();
        else{
            return PlotData::RangeTimeOpt( { _bounding_box.left()  - _time_offset,
                                             _bounding_box.right() - _time_offset } );
        }
    }

    const PlotData* transformedData() const { return _transformed_data; }

protected:
    QRectF _bounding_box;

private:
    const PlotData* _transformed_data;
    double _time_offset;
};

//--------------------------------------------
inline void DataSeriesBase::calculateBoundingBox()
{
    if( _transformed_data->size() == 0)
    {
        _bounding_box = QRectF();
        return;
    }

    double min_y = _transformed_data->front().y;
    double max_y = _transformed_data->front().y;

    for (const auto& p: *_transformed_data )
    {
        if( p.y < min_y )
        {
            min_y = p.y;
        }
        else if( p.y > max_y )
        {
           max_y = p.y;
        }
    }

    _bounding_box.setLeft(  _transformed_data->front().x );
    _bounding_box.setRight( _transformed_data->back().x );
    _bounding_box.setBottom( min_y );
    _bounding_box.setTop( max_y );
}

#endif // SERIES_DATA_H