qwt_series_data.h

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/******************************************************************************
 * 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
 *****************************************************************************/
 
#ifndef QWT_SERIES_DATA_H
#define QWT_SERIES_DATA_H
 
#include "qwt_global.h"
#include "qwt_samples.h"
#include "qwt_point_3d.h"
 
#include <qvector.h>
#include <qrect.h>
 
class QwtPointPolar;
 
template< typename T >
class QwtSeriesData
{
  public:
    QwtSeriesData();
 
    virtual ~QwtSeriesData();
 
#ifndef QWT_PYTHON_WRAPPER
 
    virtual size_t size() const = 0;
 
    virtual T sample( size_t i ) const = 0;
 
#else
    // Needed for generating the python bindings, but not for using them !
    virtual size_t size() const { return 0; }
    virtual T sample( size_t i ) const { return T(); }
#endif
 
     virtual QRectF boundingRect() const
     {
        if ( cachedBoundingRect.width() < 0.0 )
            cachedBoundingRect = qwtBoundingRect( *this );
 
        return cachedBoundingRect;
     }
 
    virtual void setRectOfInterest( const QRectF& rect );
 
  protected:
    mutable QRectF cachedBoundingRect;
 
  private:
    QwtSeriesData< T >& operator=( const QwtSeriesData< T >& );
};
 
template< typename T >
QwtSeriesData< T >::QwtSeriesData()
    : cachedBoundingRect( 0.0, 0.0, -1.0, -1.0 )
{
}
 
template< typename T >
QwtSeriesData< T >::~QwtSeriesData()
{
}
 
template< typename T >
void QwtSeriesData< T >::setRectOfInterest( const QRectF& )
{
}
 
template< typename T >
class QwtArraySeriesData : public QwtSeriesData< T >
{
  public:
    QwtArraySeriesData();
 
    explicit QwtArraySeriesData( const QVector< T >& samples );
 
    void setSamples( const QVector< T >& samples );
 
    const QVector< T > samples() const;
 
    virtual size_t size() const QWT_OVERRIDE;
 
    virtual T sample( size_t index ) const QWT_OVERRIDE;
 
  protected:
    QVector< T > m_samples;
};
 
template< typename T >
QwtArraySeriesData< T >::QwtArraySeriesData()
{
}
 
template< typename T >
QwtArraySeriesData< T >::QwtArraySeriesData( const QVector< T >& samples )
    : m_samples( samples )
{
}
 
template< typename T >
void QwtArraySeriesData< T >::setSamples( const QVector< T >& samples )
{
    QwtSeriesData< T >::cachedBoundingRect = QRectF( 0.0, 0.0, -1.0, -1.0 );
    m_samples = samples;
}
 
template< typename T >
const QVector< T > QwtArraySeriesData< T >::samples() const
{
    return m_samples;
}
 
template< typename T >
size_t QwtArraySeriesData< T >::size() const
{
    return m_samples.size();
}
 
template< typename T >
T QwtArraySeriesData< T >::sample( size_t i ) const
{
    return m_samples[ static_cast< int >( i ) ];
}
 
typedef QwtArraySeriesData< QPointF > QwtPointSeriesData;
 
typedef QwtArraySeriesData< QwtPoint3D > QwtPoint3DSeriesData;
 
typedef QwtArraySeriesData< QwtIntervalSample > QwtIntervalSeriesData;
 
typedef QwtArraySeriesData< QwtSetSample > QwtSetSeriesData;
 
typedef QwtArraySeriesData< QwtVectorFieldSample > QwtVectorFieldData;
 
typedef QwtArraySeriesData< QwtOHLCSample > QwtTradingChartData;
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QPointF >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtPoint3D >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtPointPolar >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtIntervalSample >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtSetSample >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtOHLCSample >&, int from = 0, int to = -1 );
 
QWT_EXPORT QRectF qwtBoundingRect(
    const QwtSeriesData< QwtVectorFieldSample >&, int from = 0, int to = -1 );
 
template< typename T, typename LessThan >
inline int qwtUpperSampleIndex( const QwtSeriesData< T >& series,
    double value, LessThan lessThan  )
{
    const int indexMax = series.size() - 1;
 
    if ( indexMax < 0 || !lessThan( value, series.sample( indexMax ) ) )
        return -1;
 
    int indexMin = 0;
    int n = indexMax;
 
    while ( n > 0 )
    {
        const int half = n >> 1;
        const int indexMid = indexMin + half;
 
        if ( lessThan( value, series.sample( indexMid ) ) )
        {
            n = half;
        }
        else
        {
            indexMin = indexMid + 1;
            n -= half + 1;
        }
    }
 
    return indexMin;
}
 
#endif