Qwt User's Guide  6.0.2
qwt_plot_histogram.h
1 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2  * Qwt Widget Library
3  * Copyright (C) 1997 Josef Wilgen
4  * Copyright (C) 2002 Uwe Rathmann
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the Qwt License, Version 1.0
8  *****************************************************************************/
9 
10 #ifndef QWT_PLOT_HISTOGRAM_H
11 #define QWT_PLOT_HISTOGRAM_H
12 
13 #include "qwt_global.h"
14 #include "qwt_plot_seriesitem.h"
15 #include "qwt_column_symbol.h"
16 #include <qcolor.h>
17 #include <qvector.h>
18 
19 class QwtIntervalData;
20 class QString;
21 class QPolygonF;
22 
37 class QWT_EXPORT QwtPlotHistogram: public QwtPlotSeriesItem<QwtIntervalSample>
38 {
39 public:
47  {
55 
62 
67 
73  UserStyle = 100
74  };
75 
76  explicit QwtPlotHistogram( const QString &title = QString::null );
77  explicit QwtPlotHistogram( const QwtText &title );
78  virtual ~QwtPlotHistogram();
79 
80  virtual int rtti() const;
81 
82  void setPen( const QPen & );
83  const QPen &pen() const;
84 
85  void setBrush( const QBrush & );
86  const QBrush &brush() const;
87 
88  void setSamples( const QVector<QwtIntervalSample> & );
89 
90  void setBaseline( double reference );
91  double baseline() const;
92 
93  void setStyle( HistogramStyle style );
94  HistogramStyle style() const;
95 
96  void setSymbol( const QwtColumnSymbol * );
97  const QwtColumnSymbol *symbol() const;
98 
99  virtual void drawSeries( QPainter *p,
100  const QwtScaleMap &xMap, const QwtScaleMap &yMap,
101  const QRectF &canvasRect, int from, int to ) const;
102 
103  virtual QRectF boundingRect() const;
104 
105  virtual void drawLegendIdentifier( QPainter *, const QRectF & ) const;
106 
107 protected:
108  virtual QwtColumnRect columnRect( const QwtIntervalSample &,
109  const QwtScaleMap &, const QwtScaleMap & ) const;
110 
111  virtual void drawColumn( QPainter *, const QwtColumnRect &,
112  const QwtIntervalSample & ) const;
113 
114  void drawColumns( QPainter *,
115  const QwtScaleMap &xMap, const QwtScaleMap &yMap,
116  int from, int to ) const;
117 
118  void drawOutline( QPainter *,
119  const QwtScaleMap &xMap, const QwtScaleMap &yMap,
120  int from, int to ) const;
121 
122  void drawLines( QPainter *,
123  const QwtScaleMap &xMap, const QwtScaleMap &yMap,
124  int from, int to ) const;
125 
126 private:
127  void init();
128  void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;
129 
130  class PrivateData;
131  PrivateData *d_data;
132 };
133 
134 #endif