qwt_interval_symbol.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
 *****************************************************************************/

#ifndef QWT_INTERVAL_SYMBOL_H
#define QWT_INTERVAL_SYMBOL_H

#include "qwt_global.h"
#include <qpen.h>
#include <qsize.h>

class QPainter;
class QRect;
class QPointF;

/*!
  \brief A drawing primitive for displaying an interval like an error bar

  \sa QwtPlotIntervalCurve
*/
class QWT_EXPORT QwtIntervalSymbol
{
public:
    //! Symbol style
    enum Style
    {
        //! No Style. The symbol cannot be drawn.
        NoSymbol = -1,

        /*!
          The symbol displays a line with caps at the beginning/end.
          The size of the caps depends on the symbol width().
         */
        Bar,

        /*!
          The symbol displays a plain rectangle using pen() and brush().
          The size of the rectangle depends on the translated interval and
          the width(),
         */
        Box,

        /*!
          Styles >= UserSymbol are reserved for derived
          classes of QwtIntervalSymbol that overload draw() with
          additional application specific symbol types.
         */
        UserSymbol = 1000
    };

public:
    QwtIntervalSymbol( Style = NoSymbol );
    QwtIntervalSymbol( const QwtIntervalSymbol & );
    virtual ~QwtIntervalSymbol();

    QwtIntervalSymbol &operator=( const QwtIntervalSymbol & );
    bool operator==( const QwtIntervalSymbol & ) const;
    bool operator!=( const QwtIntervalSymbol & ) const;

    void setWidth( int );
    int width() const;

    void setBrush( const QBrush& b );
    const QBrush& brush() const;

    void setPen( const QColor &, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
    void setPen( const QPen & );
    const QPen& pen() const;

    void setStyle( Style );
    Style style() const;

    virtual void draw( QPainter *, Qt::Orientation,
        const QPointF& from, const QPointF& to ) const;

private:

    class PrivateData;
    PrivateData* d_data;
};

#endif