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

class QPainter;
class QPoint;

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

    virtual void draw(QPainter *painter, const QPoint &center, 
        int length, double direction, 
        QPalette::ColorGroup cg = QPalette::Active) const = 0;

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

protected:
    static void drawKnob(QPainter *, const QPoint &pos, 
        int width, const QBrush &, bool sunken);

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);

    virtual void draw(QPainter *, const QPoint &, int length, 
        double direction, QPalette::ColorGroup = QPalette::Active) const;

    static void drawArrowNeedle(QPainter *, 
        const QPalette&, QPalette::ColorGroup,
        const QPoint &, int length, int width, double direction, 
        bool hasKnob);

    static void drawRayNeedle(QPainter *, 
        const QPalette&, QPalette::ColorGroup,
        const QPoint &, int length, int width, double direction, 
        bool hasKnob);

    void setWidth(int width);
    int width() const;

private:
    Style d_style;
    bool d_hasKnob;
    int 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);

    virtual void draw(QPainter *, const QPoint &, int length, 
        double direction, QPalette::ColorGroup = QPalette::Active) const;

    static void drawTriangleNeedle(QPainter *, 
        const QPalette &, QPalette::ColorGroup,
        const QPoint &, int length, double direction); 

    static void drawThinNeedle(QPainter *,
        const QPalette &, QPalette::ColorGroup,
        const QPoint &, int length, double direction);

protected:
    static void drawPointer(QPainter *painter, const QBrush &brush,
        int colorOffset, const QPoint &center, 
        int length, int width, double direction);

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);

    virtual void draw(QPainter *, const QPoint &, int length,
        double direction, QPalette::ColorGroup = QPalette::Active) const;

    static void drawStyle1Needle(QPainter *, 
        const QPalette &, QPalette::ColorGroup,
        const QPoint &, int length, double direction);

    static void drawStyle2Needle(QPainter *, 
        const QPalette &, QPalette::ColorGroup,
        const QPoint &, int length, double direction);

private:
    Style d_style;
};

#endif // QWT_DIAL_NEEDLE_H

---