qwt_dial.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_H
#define QWT_DIAL_H
 
#include "qwt_global.h"
#include "qwt_abstract_slider.h"
 
#include <qframe.h>
#include <qpalette.h>
 
class QwtDialNeedle;
class QwtRoundScaleDraw;
class QwtAbstractScaleDraw;
 
class QWT_EXPORT QwtDial : public QwtAbstractSlider
{
    Q_OBJECT
 
    Q_ENUMS(Shadow Mode Direction)
 
    Q_PROPERTY(int lineWidth READ lineWidth WRITE setLineWidth)
    Q_PROPERTY(Shadow frameShadow READ frameShadow WRITE setFrameShadow)
    Q_PROPERTY(Mode mode READ mode WRITE setMode)
    Q_PROPERTY(double origin READ origin WRITE setOrigin)
    Q_PROPERTY(double minScaleArc READ minScaleArc WRITE setMinScaleArc)
    Q_PROPERTY(double maxScaleArc READ maxScaleArc WRITE setMaxScaleArc)
 
public:
    enum Shadow
    {
        Plain = QFrame::Plain,
 
        Raised = QFrame::Raised,
 
        Sunken = QFrame::Sunken
    };
 
    enum Mode
    {
        RotateNeedle,
 
        RotateScale
    };
 
    explicit QwtDial(QWidget* parent = nullptr);
    ~QwtDial() override;
 
    void setFrameShadow(Shadow);
    Shadow frameShadow() const;
 
    void setLineWidth(int);
    int lineWidth() const;
 
    void setMode(Mode);
    Mode mode() const;
 
    void setScaleArc(double minArc, double maxArc);
 
    void setMinScaleArc(double);
    double minScaleArc() const;
 
    void setMaxScaleArc(double);
    double maxScaleArc() const;
 
    virtual void setOrigin(double);
    double origin() const;
 
    void setNeedle(QwtDialNeedle*);
    const QwtDialNeedle* needle() const;
    QwtDialNeedle* needle();
 
    QRect boundingRect() const;
    QRect innerRect() const;
 
    virtual QRect scaleInnerRect() const;
 
    virtual QSize sizeHint() const override;
    virtual QSize minimumSizeHint() const override;
 
    void setScaleDraw(QwtRoundScaleDraw*);
 
    QwtRoundScaleDraw* scaleDraw();
    const QwtRoundScaleDraw* scaleDraw() const;
 
protected:
    virtual void wheelEvent(QWheelEvent*) override;
    virtual void paintEvent(QPaintEvent*) override;
    virtual void changeEvent(QEvent*) override;
 
    virtual void drawFrame(QPainter*);
    virtual void drawContents(QPainter*) const;
    virtual void drawFocusIndicator(QPainter*) const;
 
    void invalidateCache();
 
    virtual void drawScale(QPainter*, const QPointF& center, double radius) const;
 
    virtual void drawScaleContents(QPainter* painter, const QPointF& center, double radius) const;
 
    virtual void drawNeedle(QPainter*, const QPointF&, double radius, double direction, QPalette::ColorGroup) const;
 
    virtual double scrolledTo(const QPoint&) const override;
    virtual bool isScrollPosition(const QPoint&) const override;
 
    virtual void sliderChange() override;
    virtual void scaleChange() override;
 
private:
    void setAngleRange(double angle, double span);
    void drawNeedle(QPainter*) const;
 
    QWT_DECLARE_PRIVATE(QwtDial)
};
 
#endif