qwt_dial_needle.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * 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
 *****************************************************************************/

#ifndef QWT_DIAL_NEEDLE_H
#define QWT_DIAL_NEEDLE_H 1

#include "qwt_global.h"
#include <qpalette.h>

class QPainter;
class QPoint;

class QWT_EXPORT QwtDialNeedle
{
public:
    QwtDialNeedle();
    virtual ~QwtDialNeedle();

    virtual void setPalette( const QPalette & );
    const QPalette &palette() const;

    virtual void draw( QPainter *painter, 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:
    QPalette d_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;

private:
    Style d_style;
    bool d_hasKnob;
    double d_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;

private:
    Style d_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;

private:
    Style d_style;
};

#endif