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 );
    virtual ~QwtDial();
 
    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;
 
    class PrivateData;
    PrivateData* m_data;
};
 
#endif