qwt_dial_needle.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_DIAL_NEEDLE_H
#define QWT_DIAL_NEEDLE_H
 
#include "qwt_global.h"
#include <qpalette.h>
 
class QPainter;
 
class QWT_EXPORT QwtDialNeedle
{
  public:
    QwtDialNeedle();
    virtual ~QwtDialNeedle();
 
    virtual void setPalette( const QPalette& );
    const QPalette& palette() const;
 
    virtual void draw( QPainter*, const QPointF& center,
        double length, double direction,
        QPalette::ColorGroup = QPalette::Active ) const;
 
  protected:
    virtual void drawNeedle( QPainter* painter,
        double length, QPalette::ColorGroup colorGroup ) const = 0;
 
    virtual void drawKnob( QPainter*, double width,
        const QBrush&, bool sunken ) const;
 
  private:
    Q_DISABLE_COPY(QwtDialNeedle)
 
    QPalette m_palette;
};
 
class QWT_EXPORT QwtDialSimpleNeedle : public QwtDialNeedle
{
  public:
    enum Style
    {
        Arrow,
 
        Ray
    };
 
    QwtDialSimpleNeedle( Style, bool hasKnob = true,
        const QColor& mid = Qt::gray, const QColor& base = Qt::darkGray );
 
    void setWidth( double width );
    double width() const;
 
  protected:
    virtual void drawNeedle( QPainter*, double length,
        QPalette::ColorGroup ) const override;
 
  private:
    Style m_style;
    bool m_hasKnob;
    double m_width;
};
 
class QWT_EXPORT QwtCompassMagnetNeedle : public QwtDialNeedle
{
  public:
    enum Style
    {
        TriangleStyle,
 
        ThinStyle
    };
 
    QwtCompassMagnetNeedle( Style = TriangleStyle,
        const QColor& light = Qt::white, const QColor& dark = Qt::red );
 
  protected:
    virtual void drawNeedle( QPainter*,
        double length, QPalette::ColorGroup ) const override;
 
  private:
    Style m_style;
};
 
class QWT_EXPORT QwtCompassWindArrow : public QwtDialNeedle
{
  public:
    enum Style
    {
        Style1,
 
        Style2
    };
 
    QwtCompassWindArrow( Style, const QColor& light = Qt::white,
        const QColor& dark = Qt::gray );
 
  protected:
    virtual void drawNeedle( QPainter*,
        double length, QPalette::ColorGroup ) const override;
 
  private:
    Style m_style;
};
 
#endif