/usr/include/qwt/qwt_plot_histogram.h is in libqwt-dev 6.0.0-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /* -*- 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;
/*!
\brief QwtPlotHistogram represents a series of samples, where an interval
is associated with a value ( \f$y = f([x1,x2])\f$ ).
The representation depends on the style() and an optional symbol()
that is displayed for each interval.
\note The term "histogram" is used in a different way in the areas of
digital image processing and statistics. Wikipedia introduces the
terms "image histogram" and "color histogram" to avoid confusions.
While "image histograms" can be displayed by a QwtPlotCurve there
is no applicable plot item for a "color histogram" yet.
*/
class QWT_EXPORT QwtPlotHistogram: public QwtPlotSeriesItem<QwtIntervalSample>
{
public:
/*!
Histogram styles.
The default style is QwtPlotHistogram::Columns.
\sa setStyle(), style(), setSymbol(), symbol(), setBaseline()
*/
enum HistogramStyle
{
/*!
Draw an outline around the area, that is build by all intervals
using the pen() and fill it with the brush(). The outline style
requires, that the intervals are in increasing order and
not overlapping.
*/
Outline,
/*!
Draw a column for each interval. When a symbol() has been set
the symbol is used otherwise the column is displayed as
plain rectangle using pen() and brush().
*/
Columns,
/*!
Draw a simple line using the pen() for each interval.
*/
Lines,
/*!
Styles >= UserStyle are reserved for derived
classes that overload drawSeries() with
additional application specific ways to display a histogram.
*/
UserStyle = 100
};
explicit QwtPlotHistogram( const QString &title = QString::null );
explicit QwtPlotHistogram( const QwtText &title );
virtual ~QwtPlotHistogram();
virtual int rtti() const;
void setPen( const QPen & );
const QPen &pen() const;
void setBrush( const QBrush & );
const QBrush &brush() const;
void setSamples( const QVector<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 void drawLegendIdentifier( QPainter *, const QRectF & ) 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
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