qwt_plot_textlabel.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_TEXT_LABEL_H
#define QWT_PLOT_TEXT_LABEL_H
 
#include "qwt_global.h"
#include "qwt_plot_item.h"
 
class QwtText;
 
class QWT_EXPORT QwtPlotTextLabel : public QwtPlotItem
{
public:
    // Constructor
    QwtPlotTextLabel();
    // Destructor
    ~QwtPlotTextLabel() override;
 
    // Get the runtime type information
    virtual int rtti() const override;
 
    // Set the text
    void setText(const QwtText&);
    // Get the text
    QwtText text() const;
 
    // Set the margin
    void setMargin(int margin);
    // Get the margin
    int margin() const;
 
    // Calculate the text rectangle
    virtual QRectF textRect(const QRectF&, const QSizeF&) const;
 
protected:
    virtual void draw(QPainter*, const QwtScaleMap&, const QwtScaleMap&, const QRectF&) const override;
 
    void invalidateCache();
 
private:
    QWT_DECLARE_PRIVATE(QwtPlotTextLabel)
};
 
#endif