Qwt User's Guide 6.1.0

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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
39 class QWT_EXPORT QwtPlotHistogram:
40 public QwtPlotSeriesItem, public QwtSeriesStore<QwtIntervalSample>
41 {
42 public:
49 enum HistogramStyle
50 {
57 Outline,
58
64 Columns,
65
69 Lines,
70
76 UserStyle = 100
77 };
78
79 explicit QwtPlotHistogram( const QString &title = QString::null );
80 explicit QwtPlotHistogram( const QwtText &title );
81 virtual ~QwtPlotHistogram();
82
83 virtual int rtti() const;
84
85 void setPen( const QColor &, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
86 void setPen( const QPen & );
87 const QPen &pen() const;
88
89 void setBrush( const QBrush & );
90 const QBrush &brush() const;
91
92 void setSamples( const QVector<QwtIntervalSample> & );
93 void setSamples( QwtSeriesData<QwtIntervalSample> * );
94
95 void setBaseline( double reference );
96 double baseline() const;
97
98 void setStyle( HistogramStyle style );
99 HistogramStyle style() const;
100
101 void setSymbol( const QwtColumnSymbol * );
102 const QwtColumnSymbol *symbol() const;
103
104 virtual void drawSeries( QPainter *p,
105 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
106 const QRectF &canvasRect, int from, int to ) const;
107
108 virtual QRectF boundingRect() const;
109
110 virtual QwtGraphic legendIcon( int index, const QSizeF & ) const;
111
112 protected:
113 virtual QwtColumnRect columnRect( const QwtIntervalSample &,
114 const QwtScaleMap &, const QwtScaleMap & ) const;
115
116 virtual void drawColumn( QPainter *, const QwtColumnRect &,
117 const QwtIntervalSample & ) const;
118
119 void drawColumns( QPainter *,
120 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
121 int from, int to ) const;
122
123 void drawOutline( QPainter *,
124 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
125 int from, int to ) const;
126
127 void drawLines( QPainter *,
128 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
129 int from, int to ) const;
130
131 private:
132 void init();
133 void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;
134
135 class PrivateData;
136 PrivateData *d_data;
137 };
138
139 #endif