qwt_plot_legenditem.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_LEGEND_ITEM_H
#define QWT_PLOT_LEGEND_ITEM_H
 
#include "qwt_global.h"
#include "qwt_plot_item.h"
 
class QFont;
 
class QWT_EXPORT QwtPlotLegendItem : public QwtPlotItem
{
  public:
    enum BackgroundMode
    {
        LegendBackground,
 
        ItemBackground
    };
 
    explicit QwtPlotLegendItem();
    virtual ~QwtPlotLegendItem();
 
    virtual int rtti() const QWT_OVERRIDE;
 
    void setAlignmentInCanvas( Qt::Alignment );
    Qt::Alignment alignmentInCanvas() const;
 
    void setOffsetInCanvas( Qt::Orientations, int numPixels );
    int offsetInCanvas( Qt::Orientation ) const;
 
    void setMaxColumns( uint );
    uint maxColumns() const;
 
    void setMargin( int );
    int margin() const;
 
    void setSpacing( int );
    int spacing() const;
 
    void setItemMargin( int );
    int itemMargin() const;
 
    void setItemSpacing( int );
    int itemSpacing() const;
 
    void setFont( const QFont& );
    QFont font() const;
 
    void setBorderRadius( double );
    double borderRadius() const;
 
    void setBorderPen( const QPen& );
    QPen borderPen() const;
 
    void setBackgroundBrush( const QBrush& );
    QBrush backgroundBrush() const;
 
    void setBackgroundMode( BackgroundMode );
    BackgroundMode backgroundMode() const;
 
    void setTextPen( const QPen& );
    QPen textPen() const;
 
    virtual void draw( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect ) const QWT_OVERRIDE;
 
    void clearLegend();
 
    virtual void updateLegend( const QwtPlotItem*,
        const QList< QwtLegendData >& ) QWT_OVERRIDE;
 
    virtual QRect geometry( const QRectF& canvasRect ) const;
 
    virtual QSize minimumSize( const QwtLegendData& ) const;
    virtual int heightForWidth( const QwtLegendData&, int width ) const;
 
    QList< const QwtPlotItem* > plotItems() const;
    QList< QRect > legendGeometries( const QwtPlotItem* ) const;
 
  protected:
    virtual void drawLegendData( QPainter*,
        const QwtPlotItem*, const QwtLegendData&, const QRectF& ) const;
 
    virtual void drawBackground( QPainter*, const QRectF& rect ) const;
 
  private:
    class PrivateData;
    PrivateData* m_data;
};
 
#endif