qwt_plot_item.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_ITEM_H
#define QWT_PLOT_ITEM_H
 
#include "qwt_global.h"
#include "qwt_axis_id.h"
#include <qmetatype.h>
 
class QwtScaleMap;
class QwtScaleDiv;
class QwtPlot;
class QwtText;
class QwtGraphic;
class QwtLegendData;
class QRectF;
class QPainter;
class QString;
template< typename T >
class QList;
 
class QWT_EXPORT QwtPlotItem
{
public:
    enum RttiValues
    {
        Rtti_PlotItem = 0,
 
        Rtti_PlotGrid,
 
        Rtti_PlotScale,
 
        Rtti_PlotLegend,
 
        Rtti_PlotMarker,
 
        Rtti_PlotCurve,
 
        Rtti_PlotSpectroCurve,
 
        Rtti_PlotIntervalCurve,
 
        Rtti_PlotHistogram,
 
        Rtti_PlotSpectrogram,
 
        Rtti_PlotGraphic,
 
        Rtti_PlotTradingCurve,
 
        Rtti_PlotBarChart,
 
        Rtti_PlotMultiBarChart,
 
        Rtti_PlotShape,
 
        Rtti_PlotTextLabel,
 
        Rtti_PlotZone,
 
        Rtti_PlotVectorField,
 
        Rtti_PlotUserItem = 1000
    };
 
    enum ItemAttribute
    {
        Legend = 0x01,
 
        AutoScale = 0x02,
 
        Margins = 0x04
    };
 
    Q_DECLARE_FLAGS(ItemAttributes, ItemAttribute)
 
    
    enum ItemInterest
    {
        ScaleInterest = 0x01,
 
        LegendInterest = 0x02
    };
 
    Q_DECLARE_FLAGS(ItemInterests, ItemInterest)
 
    
    enum RenderHint
    {
        RenderAntialiased = 0x1
    };
 
    Q_DECLARE_FLAGS(RenderHints, RenderHint)
 
    explicit QwtPlotItem();
    explicit QwtPlotItem(const QString& title);
    explicit QwtPlotItem(const QwtText& title);
 
    virtual ~QwtPlotItem();
 
    void attach(QwtPlot* plot);
    void detach();
 
    QwtPlot* plot() const;
 
    void setTitle(const QString& title);
    void setTitle(const QwtText& title);
    const QwtText& title() const;
 
    virtual int rtti() const;
 
    void setItemAttribute(ItemAttribute, bool on = true);
    bool testItemAttribute(ItemAttribute) const;
 
    void setItemInterest(ItemInterest, bool on = true);
    bool testItemInterest(ItemInterest) const;
 
    void setRenderHint(RenderHint, bool on = true);
    bool testRenderHint(RenderHint) const;
 
    void setRenderThreadCount(uint numThreads);
    uint renderThreadCount() const;
 
    void setLegendIconSize(const QSize&);
    QSize legendIconSize() const;
 
    double z() const;
    void setZ(double z);
 
    void show();
    void hide();
    virtual void setVisible(bool);
    bool isVisible() const;
 
    void setAxes(QwtAxisId xAxis, QwtAxisId yAxis);
 
    void setXAxis(QwtAxisId);
    QwtAxisId xAxis() const;
 
    void setYAxis(QwtAxisId);
    QwtAxisId yAxis() const;
 
    virtual void itemChanged();
    virtual void legendChanged();
 
    virtual void draw(QPainter* painter, const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QRectF& canvasRect) const = 0;
 
    virtual QRectF boundingRect() const;
 
    virtual void getCanvasMarginHint(const QwtScaleMap& xMap,
                                     const QwtScaleMap& yMap,
                                     const QRectF& canvasRect,
                                     double& left,
                                     double& top,
                                     double& right,
                                     double& bottom) const;
 
    virtual void updateScaleDiv(const QwtScaleDiv&, const QwtScaleDiv&);
 
    virtual void updateLegend(const QwtPlotItem*, const QList< QwtLegendData >&);
 
    QRectF scaleRect(const QwtScaleMap&, const QwtScaleMap&) const;
    QRectF paintRect(const QwtScaleMap&, const QwtScaleMap&) const;
 
    virtual QList< QwtLegendData > legendData() const;
 
    virtual QwtGraphic legendIcon(int index, const QSizeF&) const;
 
protected:
    QwtGraphic defaultIcon(const QBrush&, const QSizeF&) const;
 
private:
    Q_DISABLE_COPY(QwtPlotItem)
 
    class PrivateData;
    PrivateData* m_data;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotItem::ItemAttributes)
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotItem::ItemInterests)
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotItem::RenderHints)
 
Q_DECLARE_METATYPE(QwtPlotItem*)
 
#endif