# qwt_plot_histogram.h

    00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
    00002  * Qwt Widget Library
    00003  * Copyright (C) 1997   Josef Wilgen
    00004  * Copyright (C) 2002   Uwe Rathmann
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the Qwt License, Version 1.0
    00008  *****************************************************************************/
    00009
    00010 #ifndef QWT_PLOT_HISTOGRAM_H
    00011 #define QWT_PLOT_HISTOGRAM_H
    00012
    00013 #include "qwt_global.h"
    00014 #include "qwt_plot_seriesitem.h"
    00015 #include "qwt_column_symbol.h"
    00016 #include <qcolor.h>
    00017 #include <qvector.h>
    00018
    00019 class QwtIntervalData;
    00020 class QString;
    00021 class QPolygonF;
    00022
    00037 class QWT_EXPORT QwtPlotHistogram: public QwtPlotSeriesItem<QwtIntervalSample>
    00038 {
    00039 public:
    00046     enum HistogramStyle
    00047     {
    00054         Outline,
    00055
    00061         Columns,
    00062
    00066         Lines,
    00067
    00073         UserStyle = 100
    00074     };
    00075
    00076     explicit QwtPlotHistogram( const QString &title = QString::null );
    00077     explicit QwtPlotHistogram( const QwtText &title );
    00078     virtual ~QwtPlotHistogram();
    00079
    00080     virtual int rtti() const;
    00081
    00082     void setPen( const QPen & );
    00083     const QPen &pen() const;
    00084
    00085     void setBrush( const QBrush & );
    00086     const QBrush &brush() const;
    00087
    00088     void setSamples( const QVector<QwtIntervalSample> & );
    00089
    00090     void setBaseline( double reference );
    00091     double baseline() const;
    00092
    00093     void setStyle( HistogramStyle style );
    00094     HistogramStyle style() const;
    00095
    00096     void setSymbol( const QwtColumnSymbol * );
    00097     const QwtColumnSymbol *symbol() const;
    00098
    00099     virtual void drawSeries( QPainter *p,
    00100         const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    00101         const QRectF &canvasRect, int from, int to ) const;
    00102
    00103     virtual QRectF boundingRect() const;
    00104
    00105     virtual void drawLegendIdentifier( QPainter *, const QRectF & ) const;
    00106
    00107 protected:
    00108     virtual QwtColumnRect columnRect( const QwtIntervalSample &,
    00109         const QwtScaleMap &, const QwtScaleMap & ) const;
    00110
    00111     virtual void drawColumn( QPainter *, const QwtColumnRect &,
    00112         const QwtIntervalSample & ) const;
    00113
    00114     void drawColumns( QPainter *,
    00115         const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    00116         int from, int to ) const;
    00117
    00118     void drawOutline( QPainter *,
    00119         const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    00120         int from, int to ) const;
    00121
    00122     void drawLines( QPainter *,
    00123          const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    00124          int from, int to ) const;
    00125
    00126 private:
    00127     void init();
    00128     void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;
    00129
    00130     class PrivateData;
    00131     PrivateData *d_data;
    00132 };
    00133
    00134 #endif