qwt_date_scale_engine.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_DATE_SCALE_ENGINE_H_
#define _QWT_DATE_SCALE_ENGINE_H_ 1

#include "qwt_date.h"
#include "qwt_scale_engine.h"

class QWT_EXPORT QwtDateScaleEngine: public QwtLinearScaleEngine
{
public:
    QwtDateScaleEngine( Qt::TimeSpec = Qt::LocalTime );
    virtual ~QwtDateScaleEngine();

    void setTimeSpec( Qt::TimeSpec );
    Qt::TimeSpec timeSpec() const;

    void setUtcOffset( int seconds );
    int utcOffset() const;

    void setWeek0Type( QwtDate::Week0Type );
    QwtDate::Week0Type week0Type() const;
    
    void setMaxWeeks( int );
    int maxWeeks() const;

    virtual void autoScale( int maxNumSteps,
        double &x1, double &x2, double &stepSize ) const;

    virtual QwtScaleDiv divideScale( 
        double x1, double x2,
        int maxMajorSteps, int maxMinorSteps,
        double stepSize = 0.0 ) const;

    virtual QwtDate::IntervalType intervalType( 
        const QDateTime &, const QDateTime &, int maxSteps ) const;

    QDateTime toDateTime( double ) const;

protected:
    virtual QDateTime alignDate( const QDateTime &, double stepSize,
        QwtDate::IntervalType, bool up ) const;

private:
    QwtScaleDiv buildScaleDiv( const QDateTime &, const QDateTime &,
        int maxMajorSteps, int maxMinorSteps, 
        QwtDate::IntervalType ) const;

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif