qwt_plot_histogram.h

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/* -*- 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_PLOT_HISTOGRAM_H
#define QWT_PLOT_HISTOGRAM_H

#include "qwt_global.h"
#include "qwt_plot_seriesitem.h"
#include "qwt_column_symbol.h"
#include <qcolor.h>
#include <qvector.h>

class QwtIntervalData;
class QString;
class QPolygonF;

class QWT_EXPORT QwtPlotHistogram: 
    public QwtPlotSeriesItem, public QwtSeriesStore<QwtIntervalSample>
{
public:
    enum HistogramStyle
    {
        Outline,

        Columns,

        Lines,

        UserStyle = 100
    };

    explicit QwtPlotHistogram( const QString &title = QString::null );
    explicit QwtPlotHistogram( const QwtText &title );
    virtual ~QwtPlotHistogram();

    virtual int rtti() const;

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

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

    void setSamples( const QVector<QwtIntervalSample> & );
    void setSamples( QwtSeriesData<QwtIntervalSample> * );

    void setBaseline( double reference );
    double baseline() const;

    void setStyle( HistogramStyle style );
    HistogramStyle style() const;

    void setSymbol( const QwtColumnSymbol * );
    const QwtColumnSymbol *symbol() const;

    virtual void drawSeries( QPainter *p,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        const QRectF &canvasRect, int from, int to ) const;

    virtual QRectF boundingRect() const;

    virtual QwtGraphic legendIcon( int index, const QSizeF & ) const;

protected:
    virtual QwtColumnRect columnRect( const QwtIntervalSample &,
        const QwtScaleMap &, const QwtScaleMap & ) const;

    virtual void drawColumn( QPainter *, const QwtColumnRect &,
        const QwtIntervalSample & ) const;

    void drawColumns( QPainter *,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to ) const;

    void drawOutline( QPainter *,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to ) const;

    void drawLines( QPainter *,
         const QwtScaleMap &xMap, const QwtScaleMap &yMap,
         int from, int to ) const;

private:
    void init();
    void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;

    class PrivateData;
    PrivateData *d_data;
};

#endif