qwt_analog_clock.cpp

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/* -*- 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
 *****************************************************************************/

#include "qwt_analog_clock.h"
#include "qwt_round_scale_draw.h"
#include <qmath.h>
#include <qlocale.h>

class QwtAnalogClockScaleDraw: public QwtRoundScaleDraw
{
public:
    QwtAnalogClockScaleDraw()
    {
        setSpacing( 8 );

        enableComponent( QwtAbstractScaleDraw::Backbone, false );

        setTickLength( QwtScaleDiv::MinorTick, 2 );
        setTickLength( QwtScaleDiv::MediumTick, 4 );
        setTickLength( QwtScaleDiv::MajorTick, 8 );

        setPenWidth( 1 );
    }

    virtual QwtText label( double value ) const
    {
        if ( qFuzzyCompare( value + 1.0, 1.0 ) )
            value = 60.0 * 60.0 * 12.0;

        return QLocale().toString( qRound( value / ( 60.0 * 60.0 ) ) );
    }
};

QwtAnalogClock::QwtAnalogClock( QWidget *parent ):
    QwtDial( parent )
{
    setWrapping( true );
    setReadOnly( true );

    setOrigin( 270.0 );
    setScaleDraw( new QwtAnalogClockScaleDraw() );

    setTotalSteps( 60 );

    const int secondsPerHour = 60.0 * 60.0; 

    QList<double> majorTicks;
    QList<double> minorTicks;

    for ( int i = 0; i < 12; i++ )
    {
        majorTicks += i * secondsPerHour;

        for ( int j = 1; j < 5; j++ )
            minorTicks += i * secondsPerHour + j * secondsPerHour / 5.0;
    }

    QwtScaleDiv scaleDiv;
    scaleDiv.setInterval( 0.0, 12.0 * secondsPerHour );
    scaleDiv.setTicks( QwtScaleDiv::MajorTick, majorTicks );
    scaleDiv.setTicks( QwtScaleDiv::MinorTick, minorTicks );
    setScale( scaleDiv );

    QColor knobColor = palette().color( QPalette::Active, QPalette::Text );
    knobColor = knobColor.dark( 120 );

    QColor handColor;
    int width;

    for ( int i = 0; i < NHands; i++ )
    {
        if ( i == SecondHand )
        {
            width = 2;
            handColor = knobColor.dark( 120 );
        }
        else
        {
            width = 8;
            handColor = knobColor;
        }

        QwtDialSimpleNeedle *hand = new QwtDialSimpleNeedle(
            QwtDialSimpleNeedle::Arrow, true, handColor, knobColor );
        hand->setWidth( width );

        d_hand[i] = NULL;
        setHand( static_cast<Hand>( i ), hand );
    }
}

QwtAnalogClock::~QwtAnalogClock()
{
    for ( int i = 0; i < NHands; i++ )
        delete d_hand[i];
}

void QwtAnalogClock::setNeedle( QwtDialNeedle * )
{
    // no op
    return;
}

void QwtAnalogClock::setHand( Hand hand, QwtDialNeedle *needle )
{
    if ( hand >= 0 && hand < NHands )
    {
        delete d_hand[hand];
        d_hand[hand] = needle;
    }
}

QwtDialNeedle *QwtAnalogClock::hand( Hand hd )
{
    if ( hd < 0 || hd >= NHands )
        return NULL;

    return d_hand[hd];
}

const QwtDialNeedle *QwtAnalogClock::hand( Hand hd ) const
{
    return const_cast<QwtAnalogClock *>( this )->hand( hd );
}

void QwtAnalogClock::setCurrentTime()
{
    setTime( QTime::currentTime() );
}

void QwtAnalogClock::setTime( const QTime &time )
{
    if ( time.isValid() )
    {
        setValue( ( time.hour() % 12 ) * 60.0 * 60.0
            + time.minute() * 60.0 + time.second() );
    }
    else
        setValid( false );
}

void QwtAnalogClock::drawNeedle( QPainter *painter, const QPointF &center,
    double radius, double dir, QPalette::ColorGroup colorGroup ) const
{
    Q_UNUSED( dir );

    if ( isValid() )
    {
        const double hours = value() / ( 60.0 * 60.0 );
        const double minutes = 
            ( value() - qFloor(hours) * 60.0 * 60.0 ) / 60.0;
        const double seconds = value() - qFloor(hours) * 60.0 * 60.0
            - qFloor(minutes) * 60.0;

        double angle[NHands];
        angle[HourHand] = 360.0 * hours / 12.0;
        angle[MinuteHand] = 360.0 * minutes / 60.0;
        angle[SecondHand] = 360.0 * seconds / 60.0;

        for ( int hand = 0; hand < NHands; hand++ )
        {
            const double d = 360.0 - angle[hand] - origin();
            drawHand( painter, static_cast<Hand>( hand ), 
                center, radius, d, colorGroup );
        }
    }
}

void QwtAnalogClock::drawHand( QPainter *painter, Hand hd,
    const QPointF &center, double radius, double direction,
    QPalette::ColorGroup cg ) const
{
    const QwtDialNeedle *needle = hand( hd );
    if ( needle )
    {
        if ( hd == HourHand )
            radius = qRound( 0.8 * radius );

        needle->draw( painter, center, radius, direction, cg );
    }
}