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139 lines
4.2 KiB
139 lines
4.2 KiB
/* -*- 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::null ); |
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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 reference ); |
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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 *p, |
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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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