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/* -*- 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;
/*!
\brief Base class for needles that can be used in a QwtDial.
QwtDialNeedle is a pointer that indicates a value by pointing
to a specific direction.
Qwt is missing a set of good looking needles.
Contributions are very welcome.
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtDialNeedle
{
public:
QwtDialNeedle();
virtual ~QwtDialNeedle();
virtual void setPalette( const QPalette & );
const QPalette &palette() const;
virtual void draw( QPainter *painter, const QPointF ¢er,
double length, double direction,
QPalette::ColorGroup = QPalette::Active ) const;
protected:
/*!
\brief Draw the needle
The origin of the needle is at position (0.0, 0.0 )
pointing in direction 0.0 ( = east ).
The painter is already initilaized with translation and
rotation.
\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;
private:
QPalette d_palette;
};
/*!
\brief A needle for dial widgets
The following colors are used:
- QPalette::Mid\n
Pointer
- QPalette::Base\n
Knob
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtDialSimpleNeedle: public QwtDialNeedle
{
public:
//! Style of the needle
enum Style
{
//! Arrow
Arrow,
//! A straight line from the center
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;
};
/*!
\brief A magnet needle for compass widgets
A magnet needle points to two opposite directions indicating
north and south.
The following colors are used:
- QPalette::Light\n
Used for pointing south
- QPalette::Dark\n
Used for pointing north
- QPalette::Base\n
Knob (ThinStyle only)
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtCompassMagnetNeedle: public QwtDialNeedle
{
public:
//! Style of the needle
enum Style
{
//! A needle with a triangular shape
TriangleStyle,
//! A thin needle
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;
};
/*!
\brief An indicator for the wind direction
QwtCompassWindArrow shows the direction where the wind comes from.
- QPalette::Light\n
Used for Style1, or the light half of Style2
- QPalette::Dark\n
Used for the dark half of Style2
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtCompassWindArrow: public QwtDialNeedle
{
public:
//! Style of the arrow
enum Style
{
//! A needle pointing to the center
Style1,
//! A needle pointing to the center
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
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