qwt_plot_histogram.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_PLOT_HISTOGRAM_H
#define QWT_PLOT_HISTOGRAM_H

#include "qwt_global.h"
#include "qwt_plot_seriesitem.h"

class QwtColumnSymbol;
class QwtColumnRect;
class QColor;
class QPolygonF;

#if QT_VERSION < 0x060000
template< typename T > class QVector;
#endif

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

        Columns,

        Lines,

        UserStyle = 100
    };

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

    virtual int rtti() const QWT_OVERRIDE;

    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 );
    double baseline() const;

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

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

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

    virtual QRectF boundingRect() const QWT_OVERRIDE;

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

  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* m_data;
};

#endif