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

class QPainter;

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

    virtual void setPalette(const QPalette &p) {
        d_palette = p;
    }
    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 QPoint &center,
                      int 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);

    void setWidth(double w);
    double width() const {
        return d_width;
    }

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

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

    void setShrinkFactor(double factor) {
        d_shrinkFactor = factor;
    }
    double shrinkFactor() const {
        return d_shrinkFactor;
    }

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

    static void drawRose(QPainter *,
#if QT_VERSION < 0x040000
                         const QColorGroup &,
#else
                         const QPalette &,
#endif
                         const QPoint &center, int radius, double origin, double width,
                         int numThorns, int numThornLevels, double shrinkFactor);

private:
    double d_width;
    int d_numThorns;
    int d_numThornLevels;
    double d_shrinkFactor;
};

#endif // QWT_COMPASS_ROSE_H