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;
 
    void setFlatStyle(bool);
    bool flatStyle() 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;
 
protected:
    QPalette m_palette;
    bool m_flatStyle;
 
private:
    QwtDialNeedle(const QwtDialNeedle&)            = delete;
    QwtDialNeedle& operator=(const QwtDialNeedle&) = delete;
};
 
class QWT_EXPORT QwtDialSimpleNeedle : public QwtDialNeedle
{
public:
    enum Style
    {
        // Arrow style
        Arrow,
 
        // A straight line from the center
        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
    {
        // A needle with a triangular shape
        TriangleStyle,
 
        // A thin needle
        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
    {
        // A needle pointing to the center
        Style1,
 
        // A needle pointing to the center
        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