qwt_compass_rose.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_COMPASS_ROSE_H
#define QWT_COMPASS_ROSE_H 1

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

class QPainter;

/*!
  \brief Abstract base class for a compass rose
*/
class QWT_EXPORT QwtCompassRose
{
public:
    //! Destructor
    virtual ~QwtCompassRose() {};

    //! Assign a palette
    virtual void setPalette( const QPalette &p )
    {
        d_palette = p;
    }

    //! \return Current palette
    const QPalette &palette() const
    {
        return d_palette;
    }

    /*!
        Draw the rose

        \param painter Painter
        \param center Center point
        \param radius Radius of the rose
        \param north Position
        \param colorGroup Color group
     */
    virtual void draw( QPainter *painter, 
        const QPointF &center, double radius, double north,
        QPalette::ColorGroup colorGroup = QPalette::Active ) const = 0;

private:
    QPalette d_palette;
};

/*!
  \brief A simple rose for QwtCompass
*/
class QWT_EXPORT QwtSimpleCompassRose: public QwtCompassRose
{
public:
    QwtSimpleCompassRose( int numThorns = 8, int numThornLevels = -1 );
    virtual ~QwtSimpleCompassRose();

    void setWidth( double w );
    double width() const;

    void setNumThorns( int count );
    int numThorns() const;

    void setNumThornLevels( int count );
    int numThornLevels() const;

    void setShrinkFactor( double factor );
    double shrinkFactor() const;

    virtual void draw( QPainter *, const QPointF &center, double radius,
        double north, QPalette::ColorGroup = QPalette::Active ) const;

    static void drawRose( QPainter *, const QPalette &,
        const QPointF &center, double radius, double origin, double width,
        int numThorns, int numThornLevels, double shrinkFactor );

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif