qwt_series_store.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_SERIES_STORE_H
#define QWT_SERIES_STORE_H
 
#include "qwtcore_global.h"
#include "qwt_series_data.h"
 
class QwtAbstractSeriesStore
{
public:
    // Destructor
    virtual ~QwtAbstractSeriesStore()
    {
    }
 
protected:
#ifndef QWT_PYTHON_WRAPPER
    virtual void dataChanged() = 0;
 
    virtual void setRectOfInterest(const QRectF&) = 0;
 
    virtual QRectF dataRect() const = 0;
 
    virtual size_t dataSize() const = 0;
#else
    // Needed for generating the python bindings, but not for using them !
    virtual void dataChanged()
    {
    }
    virtual void setRectOfInterest(const QRectF&)
    {
    }
    virtual QRectF dataRect() const
    {
        return QRectF(0.0, 0.0, -1.0, -1.0);
    }
    virtual size_t dataSize() const
    {
        return 0;
    }
#endif
};
 
template< typename T >
class QwtSeriesStore : public virtual QwtAbstractSeriesStore
{
public:
    // Constructor - The store contains no series
    explicit QwtSeriesStore();
 
    // Destructor
    ~QwtSeriesStore();
 
    // Assign a series of samples
    void setData(QwtSeriesData< T >* series);
 
    // Get the series data
    QwtSeriesData< T >* data();
 
    // Get the series data (const version)
    const QwtSeriesData< T >* data() const;
 
    // Get sample at position index
    T sample(size_t index) const;
 
    // Get number of samples of the series
    virtual size_t dataSize() const override;
 
    // Get bounding rectangle of the series or an invalid rectangle, when no series is stored
    virtual QRectF dataRect() const override;
 
    // Set a the "rect of interest" for the series
    virtual void setRectOfInterest(const QRectF& rect) override;
 
    // Replace a series without deleting the previous one
    QwtSeriesData< T >* swapData(QwtSeriesData< T >* series);
 
private:
    QwtSeriesData< T >* m_series;
};
 
template< typename T >
QwtSeriesStore< T >::QwtSeriesStore() : m_series(nullptr)
{
}
 
template< typename T >
QwtSeriesStore< T >::~QwtSeriesStore()
{
    delete m_series;
}
 
template< typename T >
inline QwtSeriesData< T >* QwtSeriesStore< T >::data()
{
    return m_series;
}
 
template< typename T >
inline const QwtSeriesData< T >* QwtSeriesStore< T >::data() const
{
    return m_series;
}
 
template< typename T >
inline T QwtSeriesStore< T >::sample(size_t index) const
{
    return m_series ? m_series->sample(index) : T();
}
 
template< typename T >
void QwtSeriesStore< T >::setData(QwtSeriesData< T >* series)
{
    if (m_series != series) {
        delete m_series;
        m_series = series;
        dataChanged();
    }
}
 
template< typename T >
size_t QwtSeriesStore< T >::dataSize() const
{
    if (m_series == nullptr)
        return 0;
 
    return m_series->size();
}
 
template< typename T >
QRectF QwtSeriesStore< T >::dataRect() const
{
    if (m_series == nullptr)
        return QRectF(1.0, 1.0, -2.0, -2.0);  // invalid
 
    return m_series->boundingRect();
}
 
template< typename T >
void QwtSeriesStore< T >::setRectOfInterest(const QRectF& rect)
{
    if (m_series)
        m_series->setRectOfInterest(rect);
}
 
template< typename T >
QwtSeriesData< T >* QwtSeriesStore< T >::swapData(QwtSeriesData< T >* series)
{
    QwtSeriesData< T >* swappedSeries = m_series;
    m_series                          = series;
 
    return swappedSeries;
}
 
#endif