| 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef _QWT_DATE_SCALE_ENGINE_H_
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| 11 | #define _QWT_DATE_SCALE_ENGINE_H_ 1
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| 12 |
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| 13 | #include "qwt_date.h"
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| 14 | #include "qwt_scale_engine.h"
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| 15 |
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| 16 | /*!
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| 17 | \brief A scale engine for date/time values
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| 18 |
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| 19 | QwtDateScaleEngine builds scales from a time intervals.
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| 20 | Together with QwtDateScaleDraw it can be used for
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| 21 | axes according to date/time values.
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| 22 |
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| 23 | Years, months, weeks, days, hours and minutes are organized
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| 24 | in steps with non constant intervals. QwtDateScaleEngine
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| 25 | classifies intervals and aligns the boundaries and tick positions
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| 26 | according to this classification.
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| 27 |
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| 28 | QwtDateScaleEngine supports representations depending
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| 29 | on Qt::TimeSpec specifications. The valid range for scales
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| 30 | is limited by the range of QDateTime, that differs
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| 31 | between Qt4 and Qt5.
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| 32 |
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| 33 | Datetime values are expected as the number of milliseconds since
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| 34 | 1970-01-01T00:00:00 Universal Coordinated Time - also known
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| 35 | as "The Epoch", that can be converted to QDateTime using
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| 36 | QwtDate::toDateTime().
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| 37 |
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| 38 | \sa QwtDate, QwtPlot::setAxisScaleEngine(),
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| 39 | QwtAbstractScale::setScaleEngine()
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| 40 | */
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| 41 | class QWT_EXPORT QwtDateScaleEngine: public QwtLinearScaleEngine
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| 42 | {
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| 43 | public:
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| 44 | QwtDateScaleEngine( Qt::TimeSpec = Qt::LocalTime );
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| 45 | virtual ~QwtDateScaleEngine();
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| 46 |
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| 47 | void setTimeSpec( Qt::TimeSpec );
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| 48 | Qt::TimeSpec timeSpec() const;
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| 49 |
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| 50 | void setUtcOffset( int seconds );
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| 51 | int utcOffset() const;
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| 52 |
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| 53 | void setWeek0Type( QwtDate::Week0Type );
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| 54 | QwtDate::Week0Type week0Type() const;
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| 55 |
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| 56 | void setMaxWeeks( int );
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| 57 | int maxWeeks() const;
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| 58 |
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| 59 | virtual void autoScale( int maxNumSteps,
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| 60 | double &x1, double &x2, double &stepSize ) const;
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| 61 |
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| 62 | virtual QwtScaleDiv divideScale(
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| 63 | double x1, double x2,
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| 64 | int maxMajorSteps, int maxMinorSteps,
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| 65 | double stepSize = 0.0 ) const;
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| 66 |
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| 67 | virtual QwtDate::IntervalType intervalType(
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| 68 | const QDateTime &, const QDateTime &, int maxSteps ) const;
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| 69 |
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| 70 | QDateTime toDateTime( double ) const;
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| 71 |
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| 72 | protected:
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| 73 | virtual QDateTime alignDate( const QDateTime &, double stepSize,
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| 74 | QwtDate::IntervalType, bool up ) const;
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| 75 |
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| 76 | private:
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| 77 | QwtScaleDiv buildScaleDiv( const QDateTime &, const QDateTime &,
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| 78 | int maxMajorSteps, int maxMinorSteps,
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| 79 | QwtDate::IntervalType ) const;
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| 80 |
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| 81 | private:
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| 82 | class PrivateData;
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| 83 | PrivateData *d_data;
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| 84 | };
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| 85 |
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| 86 | #endif
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