qwt_dial_needle.h 3.99 KB
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
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 *
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 * 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"
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#include <qpalette.h>
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class QPainter;
class QPoint;

/*!
  \brief Base class for needles that can be used in a QwtDial.

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  QwtDialNeedle is a pointer that indicates a value by pointing
  to a specific direction.

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  \sa QwtDial, QwtCompass
*/

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

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    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:
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    /*!
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      \brief Draw the needle
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      The origin of the needle is at position (0.0, 0.0 )
      pointing in direction 0.0 ( = east ). 
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      The painter is already initialized with translation and 
      rotation.
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      \param painter Painter
      \param length Length of the needle
      \param colorGroup Color group, used for painting

      \sa setPalette(), palette()
    */
    virtual void drawNeedle( QPainter *painter, 
        double length, QPalette::ColorGroup colorGroup ) const = 0;

    virtual void drawKnob( QPainter *, double width, 
        const QBrush &, bool sunken ) const;
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private:
    QPalette d_palette;
};

/*!
  \brief A needle for dial widgets

  The following colors are used:
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  - QPalette::Mid\n
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    Pointer
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  - QPalette::Base\n
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    Knob

  \sa QwtDial, QwtCompass
*/

class QWT_EXPORT QwtDialSimpleNeedle: public QwtDialNeedle
{
public:
    //! Style of the needle
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    enum Style
    {
        //! Arrow
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        Arrow,
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        //! A straight line from the center
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        Ray
    };

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    QwtDialSimpleNeedle( Style, bool hasKnob = true,
        const QColor &mid = Qt::gray, const QColor &base = Qt::darkGray );
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    void setWidth( double width );
    double width() const;
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protected:
    virtual void drawNeedle( QPainter *, double length,
        QPalette::ColorGroup ) const;
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private:
    Style d_style;
    bool d_hasKnob;
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    double d_width;
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};

/*!
  \brief A magnet needle for compass widgets

  A magnet needle points to two opposite directions indicating
  north and south.

  The following colors are used:
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  - QPalette::Light\n
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    Used for pointing south
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  - QPalette::Dark\n
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    Used for pointing north
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  - QPalette::Base\n
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    Knob (ThinStyle only)

  \sa QwtDial, QwtCompass
*/

class QWT_EXPORT QwtCompassMagnetNeedle: public QwtDialNeedle
{
public:
    //! Style of the needle
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    enum Style
    {
        //! A needle with a triangular shape
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        TriangleStyle,
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        //! A thin needle 
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        ThinStyle
    };

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    QwtCompassMagnetNeedle( Style = TriangleStyle,
        const QColor &light = Qt::white, const QColor &dark = Qt::red );
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protected:
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    virtual void drawNeedle( QPainter *, 
        double length, QPalette::ColorGroup ) const;
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private:
    Style d_style;
};

/*!
  \brief An indicator for the wind direction

  QwtCompassWindArrow shows the direction where the wind comes from.

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  - QPalette::Light\n
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    Used for Style1, or the light half of Style2
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  - QPalette::Dark\n
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    Used for the dark half of Style2

  \sa QwtDial, QwtCompass
*/

class QWT_EXPORT QwtCompassWindArrow: public QwtDialNeedle
{
public:
    //! Style of the arrow
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    enum Style
    {
        //! A needle pointing to the center
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        Style1,
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        //! A needle pointing to the center
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        Style2
    };

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    QwtCompassWindArrow( Style, const QColor &light = Qt::white,
        const QColor &dark = Qt::gray );
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protected:
    virtual void drawNeedle( QPainter *, 
        double length, QPalette::ColorGroup ) const;
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private:
    Style d_style;
};

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#endif