qwt_plot_scaleitem.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_SCALE_ITEM_H
#define QWT_PLOT_SCALE_ITEM_H
 
#include "qwt_global.h"
#include "qwt_plot_item.h"
#include "qwt_scale_draw.h"
 
class QPalette;
 
class QWT_EXPORT QwtPlotScaleItem : public QwtPlotItem
{
public:
    // Constructor
    explicit QwtPlotScaleItem(QwtScaleDraw::Alignment = QwtScaleDraw::BottomScale, const double pos = 0.0);
 
    // Destructor
    virtual ~QwtPlotScaleItem();
 
    // Get the runtime type information
    virtual int rtti() const override;
 
    // Set the scale division
    void setScaleDiv(const QwtScaleDiv&);
    // Get the scale division
    const QwtScaleDiv& scaleDiv() const;
 
    // Enable/disable scale division from axis
    void setScaleDivFromAxis(bool on);
    // Check if scale division is from axis
    bool isScaleDivFromAxis() const;
 
    // Set the palette
    void setPalette(const QPalette&);
    // Get the palette
    QPalette palette() const;
 
    // Set the font
    void setFont(const QFont&);
    // Get the font
    QFont font() const;
 
    // Set the scale draw
    void setScaleDraw(QwtScaleDraw*);
 
    // Get the scale draw (const version)
    const QwtScaleDraw* scaleDraw() const;
    // Get the scale draw
    QwtScaleDraw* scaleDraw();
 
    // Set the position
    void setPosition(double pos);
    // Get the position
    double position() const;
 
    // Set the border distance
    void setBorderDistance(int);
    // Get the border distance
    int borderDistance() const;
 
    // Set the alignment
    void setAlignment(QwtScaleDraw::Alignment);
 
    // Draw the scale item
    virtual void draw(QPainter*, const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QRectF& canvasRect) const override;
 
    // Update the scale division
    virtual void updateScaleDiv(const QwtScaleDiv&, const QwtScaleDiv&) override;
 
private:
    class PrivateData;
    PrivateData* m_data;
};
 
#endif