qwt_data.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * 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
 *****************************************************************************/

// vim: expandtab

#ifndef QWT_DATA_H
#define QWT_DATA_H 1

#include "qwt_global.h"
#include "qwt_array.h"
#include "qwt_double_rect.h"
#if QT_VERSION >= 0x040000
#include <QPolygonF>
#endif

// MOC_SKIP_BEGIN

#if defined(QWT_TEMPLATEDLL)

template class QWT_EXPORT QwtArray<double>;

#if QT_VERSION < 0x040000
#ifndef QWTARRAY_TEMPLATE_QWTDOUBLEPOINT // by mjo3
#define QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
template class QWT_EXPORT QwtArray<QwtDoublePoint>;
#endif //end of QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
#endif

#endif

// MOC_SKIP_END

/*!
  \brief QwtData defines an interface to any type of curve data.

  Classes, derived from QwtData may:
  - store the data in almost any type of container
  - calculate the data on the fly instead of storing it
 */

class QWT_EXPORT QwtData
{
public:
    QwtData();
    virtual ~QwtData(); 

    //! \return Pointer to a copy (virtual copy constructor)
    virtual QwtData *copy() const = 0;

    //! \return Size of the data set
    virtual size_t size() const = 0;

    /*!
      Return the x value of data point i
      \param i Index
      \return x X value of data point i
     */
    virtual double x(size_t i) const = 0;
    /*!
      Return the y value of data point i
      \param i Index
      \return y Y value of data point i
     */
    virtual double y(size_t i) const = 0;

    virtual QwtDoubleRect boundingRect() const;

protected:
    /*!
      Assignment operator (virtualized)
     */
    QwtData &operator=(const QwtData &);
};


/*!
  \brief Data class containing a single QwtArray<QwtDoublePoint> object. 
 */
class QWT_EXPORT QwtPolygonFData: public QwtData
{
public:
#if QT_VERSION < 0x040000
    QwtPolygonFData(const QwtArray<QwtDoublePoint> &);
#else
    QwtPolygonFData(const QPolygonF &);
#endif

    QwtPolygonFData &operator=(const QwtPolygonFData &);
    virtual QwtData *copy() const;

    virtual size_t size() const;
    virtual double x(size_t i) const;
    virtual double y(size_t i) const;

#if QT_VERSION < 0x040000
    const QwtArray<QwtDoublePoint> &data() const;
#else
    const QPolygonF &data() const;
#endif

private:
#if QT_VERSION < 0x040000
    QwtArray<QwtDoublePoint> d_data;
#else
    QPolygonF d_data;
#endif
};

/*!
  \brief Data class containing two QwtArray<double> objects.
 */

class QWT_EXPORT QwtArrayData: public QwtData
{
public:
    QwtArrayData(const QwtArray<double> &x, const QwtArray<double> &y);
    QwtArrayData(const double *x, const double *y, size_t size);
    QwtArrayData &operator=(const QwtArrayData &);
    virtual QwtData *copy() const;

    virtual size_t size() const;
    virtual double x(size_t i) const;
    virtual double y(size_t i) const;

    const QwtArray<double> &xData() const;
    const QwtArray<double> &yData() const;

    virtual QwtDoubleRect boundingRect() const;

private:
    QwtArray<double> d_x;
    QwtArray<double> d_y;
};

/*!
  \brief Data class containing two pointers to memory blocks of doubles.
 */
class QWT_EXPORT QwtCPointerData: public QwtData
{
public:
    QwtCPointerData(const double *x, const double *y, size_t size);
    QwtCPointerData &operator=(const QwtCPointerData &);
    virtual QwtData *copy() const;

    virtual size_t size() const;
    virtual double x(size_t i) const;
    virtual double y(size_t i) const;

    const double *xData() const;
    const double *yData() const;

    virtual QwtDoubleRect boundingRect() const;

private:
    const double *d_x;
    const double *d_y;
    size_t d_size;
};

#endif // !QWT_DATA