119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/* -*- 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_BAR_CHART_H
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#define QWT_PLOT_BAR_CHART_H
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#include "qwt_global.h"
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#include "qwt_plot_abstract_barchart.h"
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#include "qwt_series_data.h"
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class QwtColumnRect;
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class QwtColumnSymbol;
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/*!
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\brief QwtPlotBarChart displays a series of a values as bars.
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Each bar might be customized individually by implementing
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a specialSymbol(). Otherwise it is rendered using a default symbol.
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Depending on its orientation() the bars are displayed horizontally
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or vertically. The bars cover the interval between the baseline()
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and the value.
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By activating the LegendBarTitles mode each sample will have
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its own entry on the legend.
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The most common use case of a bar chart is to display a
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list of y coordinates, where the x coordinate is simply the index
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in the list. But for other situations ( f.e. when values are related
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to dates ) it is also possible to set x coordinates explicitly.
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\sa QwtPlotMultiBarChart, QwtPlotHistogram, QwtPlotCurve::Sticks,
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QwtPlotSeriesItem::orientation(), QwtPlotAbstractBarChart::baseline()
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*/
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class QWT_EXPORT QwtPlotBarChart:
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public QwtPlotAbstractBarChart, public QwtSeriesStore<QPointF>
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{
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public:
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/*!
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\brief Legend modes.
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The default setting is QwtPlotBarChart::LegendChartTitle.
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\sa setLegendMode(), legendMode()
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*/
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enum LegendMode
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{
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/*!
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One entry on the legend showing the default symbol
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and the title() of the chart
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\sa QwtPlotItem::title()
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*/
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LegendChartTitle,
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/*!
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One entry for each value showing the individual symbol
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of the corresponding bar and the bar title.
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\sa specialSymbol(), barTitle()
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*/
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LegendBarTitles
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};
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explicit QwtPlotBarChart( const QString &title = QString() );
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explicit QwtPlotBarChart( const QwtText &title );
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virtual ~QwtPlotBarChart();
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virtual int rtti() const;
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void setSamples( const QVector<QPointF> & );
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void setSamples( const QVector<double> & );
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void setSamples( QwtSeriesData<QPointF> * );
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void setSymbol( QwtColumnSymbol * );
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const QwtColumnSymbol *symbol() const;
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void setLegendMode( LegendMode );
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LegendMode legendMode() const;
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virtual void drawSeries( QPainter *painter,
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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 QwtColumnSymbol *specialSymbol(
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int sampleIndex, const QPointF& ) const;
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virtual QwtText barTitle( int sampleIndex ) const;
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protected:
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virtual void drawSample( QPainter *painter,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &canvasRect, const QwtInterval &boundingInterval,
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int index, const QPointF& sample ) const;
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virtual void drawBar( QPainter *,
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int sampleIndex, const QPointF& sample,
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const QwtColumnRect & ) const;
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QList<QwtLegendData> legendData() const;
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QwtGraphic legendIcon( int index, const QSizeF & ) const;
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private:
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void init();
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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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