140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_PLOT_HISTOGRAM_H
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#define QWT_PLOT_HISTOGRAM_H
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#include "qwt_global.h"
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#include "qwt_plot_seriesitem.h"
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#include "qwt_column_symbol.h"
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#include <qcolor.h>
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#include <qvector.h>
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class QwtIntervalData;
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class QString;
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class QPolygonF;
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/*!
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\brief QwtPlotHistogram represents a series of samples, where an interval
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is associated with a value ( \f$y = f([x1,x2])\f$ ).
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The representation depends on the style() and an optional symbol()
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that is displayed for each interval.
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\note The term "histogram" is used in a different way in the areas of
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digital image processing and statistics. Wikipedia introduces the
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terms "image histogram" and "color histogram" to avoid confusions.
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While "image histograms" can be displayed by a QwtPlotCurve there
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is no applicable plot item for a "color histogram" yet.
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\sa QwtPlotBarChart, QwtPlotMultiBarChart
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*/
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class QWT_EXPORT QwtPlotHistogram:
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public QwtPlotSeriesItem, public QwtSeriesStore<QwtIntervalSample>
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{
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public:
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/*!
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Histogram styles.
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The default style is QwtPlotHistogram::Columns.
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\sa setStyle(), style(), setSymbol(), symbol(), setBaseline()
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*/
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enum HistogramStyle
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{
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/*!
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Draw an outline around the area, that is build by all intervals
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using the pen() and fill it with the brush(). The outline style
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requires, that the intervals are in increasing order and
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not overlapping.
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*/
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Outline,
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/*!
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Draw a column for each interval. When a symbol() has been set
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the symbol is used otherwise the column is displayed as
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plain rectangle using pen() and brush().
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*/
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Columns,
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/*!
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Draw a simple line using the pen() for each interval.
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*/
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Lines,
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/*!
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Styles >= UserStyle are reserved for derived
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classes that overload drawSeries() with
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additional application specific ways to display a histogram.
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*/
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UserStyle = 100
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};
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explicit QwtPlotHistogram( const QString &title = QString() );
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explicit QwtPlotHistogram( const QwtText &title );
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virtual ~QwtPlotHistogram();
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virtual int rtti() const;
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void setPen( const QColor &, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
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void setPen( const QPen & );
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const QPen &pen() const;
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void setBrush( const QBrush & );
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const QBrush &brush() const;
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void setSamples( const QVector<QwtIntervalSample> & );
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void setSamples( QwtSeriesData<QwtIntervalSample> * );
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void setBaseline( double );
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double baseline() const;
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void setStyle( HistogramStyle style );
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HistogramStyle style() const;
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void setSymbol( const QwtColumnSymbol * );
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const QwtColumnSymbol *symbol() const;
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virtual void drawSeries( QPainter *,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &canvasRect, int from, int to ) const;
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virtual QRectF boundingRect() const;
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virtual QwtGraphic legendIcon( int index, const QSizeF & ) const;
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protected:
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virtual QwtColumnRect columnRect( const QwtIntervalSample &,
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const QwtScaleMap &, const QwtScaleMap & ) const;
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virtual void drawColumn( QPainter *, const QwtColumnRect &,
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const QwtIntervalSample & ) const;
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void drawColumns( QPainter *,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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int from, int to ) const;
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void drawOutline( QPainter *,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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int from, int to ) const;
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void drawLines( QPainter *,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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int from, int to ) const;
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private:
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void init();
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void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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