qwt_plot_multi_barchart.h

/******************************************************************************
 * 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
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_PLOT_MULTI_BAR_CHART_H
#define QWT_PLOT_MULTI_BAR_CHART_H
 
#include "qwt_global.h"
#include "qwt_plot_abstract_barchart.h"
 
class QwtColumnRect;
class QwtColumnSymbol;
template< typename T >
class QwtSeriesData;
 
class QWT_EXPORT QwtPlotMultiBarChart : public QwtPlotAbstractBarChart, public QwtSeriesStore< QwtSetSample >
{
public:
    enum ChartStyle
    {
        Grouped,
 
        Stacked
    };
 
    explicit QwtPlotMultiBarChart(const QString& title = QString());
    explicit QwtPlotMultiBarChart(const QwtText& title);
 
    ~QwtPlotMultiBarChart() override;
 
    virtual int rtti() const override;
 
    void attach(QwtPlot* plot) override;
 
    void setBarTitles(const QList< QwtText >&);
    QList< QwtText > barTitles() const;
 
    void setSamples(const QVector< QwtSetSample >&);
    void setSamples(const QVector< QVector< double > >&);
    void setSamples(QwtSeriesData< QwtSetSample >*);
 
    void setStyle(ChartStyle style);
    ChartStyle style() const;
 
    void setSymbol(int valueIndex, QwtColumnSymbol*);
    const QwtColumnSymbol* symbol(int valueIndex) const;
 
    void resetSymbolMap();
 
    virtual void drawSeries(QPainter*,
                            const QwtScaleMap& xMap,
                            const QwtScaleMap& yMap,
                            const QRectF& canvasRect,
                            int from,
                            int to) const override;
 
    virtual QRectF boundingRect() const override;
 
    virtual QList< QwtLegendData > legendData() const override;
 
    virtual QwtGraphic legendIcon(int index, const QSizeF&) const override;
 
protected:
    QwtColumnSymbol* symbol(int valueIndex);
 
    virtual QwtColumnSymbol* specialSymbol(int sampleIndex, int valueIndex) const;
 
    virtual void drawSample(QPainter*,
                            const QwtScaleMap& xMap,
                            const QwtScaleMap& yMap,
                            const QRectF& canvasRect,
                            const QwtInterval& boundingInterval,
                            int index,
                            const QwtSetSample&) const;
 
    virtual void drawBar(QPainter*, int sampleIndex, int valueIndex, const QwtColumnRect&) const;
 
    void drawStackedBars(QPainter*,
                         const QwtScaleMap& xMap,
                         const QwtScaleMap& yMap,
                         const QRectF& canvasRect,
                         int index,
                         double sampleWidth,
                         const QwtSetSample&) const;
 
    void drawGroupedBars(QPainter*,
                         const QwtScaleMap& xMap,
                         const QwtScaleMap& yMap,
                         const QRectF& canvasRect,
                         int index,
                         double sampleWidth,
                         const QwtSetSample&) const;
 
private:
    void init();
 
    QWT_DECLARE_PRIVATE(QwtPlotMultiBarChart)
};
 
#endif