Example #1
0
void Ecliptic::drawCompassLabels() {
    const Projector*  proj = SkyMap::Instance()->projector();
    KStarsData*       data = KStarsData::Instance();
    SkyLabeler* skyLabeler = SkyLabeler::Instance();
    // Set proper color for labels
    QColor color( data->colorScheme()->colorNamed( "CompassColor" ) );
    skyLabeler->setPen( QPen( QBrush(color), 1, Qt::SolidLine) );

    KSNumbers num( data->ut().djd() );
    dms elat(0.0), elng(0.0);
    QString label;
    for( int ra = 0; ra < 23; ra += 6 ) {
        elng.setH( ra );
        SkyPoint o;
        o.setFromEcliptic( num.obliquity(), elng, elat );
        o.setRA0(  o.ra()  );
        o.setDec0( o.dec() );
        o.EquatorialToHorizontal( data->lst(), data->geo()->lat() );
        bool visible;
        QPointF cpoint = proj->toScreen( &o, false, &visible );
        if( visible && proj->checkVisibility( &o ) ) {
            label.setNum( o.ra().reduce().Degrees() );
            skyLabeler->drawGuideLabel( cpoint, label, 0.0 );
        }
    }
}
Example #2
0
Ecliptic::Ecliptic(SkyComposite *parent ) :
        LineListIndex( parent, i18n("Ecliptic") ),
        m_label( name() )
{
    KStarsData *data = KStarsData::Instance();
    KSNumbers num( data->ut().djd() );
    dms elat(0.0), elng(0.0);

    const double eps    =   0.1;
    const double minRa  =   0.0;
    const double maxRa  =  23.0;
    const double dRa    =   2.0;
    const double dRa2   =  2. / 5.;

    for(double ra = minRa; ra < maxRa; ra += dRa ) {
        LineList* lineList = new LineList();
        for(double ra2 = ra; ra2 <= ra + dRa + eps; ra2 += dRa2 ) {
            elng.setH( ra2 );
            SkyPoint* o = new SkyPoint();
            o->setFromEcliptic( num.obliquity(), elng, elat );
            o->setRA0( o->ra().Hours() );
            o->setDec0( o->dec().Degrees() );
            o->EquatorialToHorizontal( data->lst(), data->geo()->lat() );
            lineList->append( o );
        }
        appendLine( lineList );
    }
}
Example #3
0
void KSPlanetBase::findPA( const KSNumbers *num ) {
    //Determine position angle of planet (assuming that it is aligned with
    //the Ecliptic, which is only roughly correct).
    //Displace a point along +Ecliptic Latitude by 1 degree
    SkyPoint test;
    dms newELat( ecLat().Degrees() + 1.0 );
    test.setFromEcliptic( num->obliquity(), ecLong(), newELat );
    double dx = ra().Degrees() - test.ra().Degrees(); 
    double dy = test.dec().Degrees() - dec().Degrees();
    double pa;
    if ( dy ) {
        pa = atan2( dx, dy )*180.0/dms::PI;
    } else {
        pa = dx < 0 ? 90.0 : -90.0;
    }
    setPA( pa );
}