Newer
Older
/* -*- 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"
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.
\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:
The origin of the needle is at position (0.0, 0.0 )
pointing in direction 0.0 ( = east ).
The painter is already initialized 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:
Knob
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtDialSimpleNeedle: public QwtDialNeedle
{
public:
//! Style of the needle
QwtDialSimpleNeedle( Style, bool hasKnob = true,
const QColor &mid = Qt::gray, const QColor &base = Qt::darkGray );
protected:
virtual void drawNeedle( QPainter *, double length,
QPalette::ColorGroup ) const;
};
/*!
\brief A magnet needle for compass widgets
A magnet needle points to two opposite directions indicating
north and south.
The following colors are used:
Knob (ThinStyle only)
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtCompassMagnetNeedle: public QwtDialNeedle
{
public:
//! Style of the needle
QwtCompassMagnetNeedle( Style = TriangleStyle,
const QColor &light = Qt::white, const QColor &dark = Qt::red );
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.
Used for the dark half of Style2
\sa QwtDial, QwtCompass
*/
class QWT_EXPORT QwtCompassWindArrow: public QwtDialNeedle
{
public:
//! Style of the arrow
QwtCompassWindArrow( Style, const QColor &light = Qt::white,
const QColor &dark = Qt::gray );
protected:
virtual void drawNeedle( QPainter *,
double length, QPalette::ColorGroup ) const;