qwt_scale_draw.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_SCALE_DRAW_H
#define QWT_SCALE_DRAW_H
 
#include "qwt_global.h"
#include "qwt_abstract_scale_draw.h"
 
#include <qpoint.h>
 
class QTransform;
class QSizeF;
class QRectF;
class QRect;
 
class QWT_EXPORT QwtScaleDraw : public QwtAbstractScaleDraw
{
public:
    enum Alignment
    {
        BottomScale,
 
        TopScale,
 
        LeftScale,
 
        RightScale
    };
 
    QwtScaleDraw();
    ~QwtScaleDraw() override;
 
    void getBorderDistHint(const QFont&, int& start, int& end) const;
    int minLabelDist(const QFont&) const;
 
    int minLength(const QFont&) const;
    virtual double extent(const QFont&) const override;
 
    void move(double x, double y);
    void move(const QPointF&);
    void setLength(double length);
 
    Alignment alignment() const;
    void setAlignment(Alignment);
 
    Qt::Orientation orientation() const;
 
    QPointF pos() const;
    double length() const;
 
    void setLabelAlignment(Qt::Alignment);
    Qt::Alignment labelAlignment() const;
 
    void setLabelRotation(double rotation);
    double labelRotation() const;
 
    int maxLabelHeight(const QFont&) const;
    int maxLabelWidth(const QFont&) const;
 
    QPointF labelPosition(double value) const;
 
    QRectF labelRect(const QFont&, double value) const;
    QSizeF labelSize(const QFont&, double value) const;
 
    QRect boundingLabelRect(const QFont&, double value) const;
 
protected:
    QTransform labelTransformation(const QPointF&, const QSizeF&) const;
 
    virtual void drawTick(QPainter*, double value, double len) const override;
 
    virtual void drawBackbone(QPainter*) const override;
    virtual void drawLabel(QPainter*, double value) const override;
 
private:
    void updateMap();
 
    QWT_DECLARE_PRIVATE(QwtScaleDraw)
};
 
inline void QwtScaleDraw::move(double x, double y)
{
    move(QPointF(x, y));
}
 
#endif