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/***************************************************************************
ksplanetbase.cpp - Trinity Desktop Planetarium
-------------------
begin : Sun Jul 22 2001
copyright : (C) 2001 by Jason Harris
email : jharris@30doradus.org
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <math.h>
#include <tqfile.h>
#include <tqpoint.h>
#include <tqwmatrix.h>
#include "ksplanetbase.h"
#include "ksplanet.h"
#include "kstarsdata.h"
#include "ksutils.h"
#include "ksnumbers.h"
#include "kspopupmenu.h"
KSPlanetBase::KSPlanetBase( KStarsData *kd, TQString s, TQString image_file, double pSize )
: SkyObject( 2, 0.0, 0.0, 0.0, s, "" ), Rearth(0.0), Image(0), data(kd) {
if (! image_file.isEmpty()) {
TQFile imFile;
if ( KSUtils::openDataFile( imFile, image_file ) ) {
imFile.close();
Image0.load( imFile.name() );
Image = Image0.convertDepth( 32 );
Image0 = Image;
}
}
PositionAngle = 0.0;
ImageAngle = 0.0;
PhysicalSize = pSize;
Trail.setAutoDelete( TRUE );
}
void KSPlanetBase::EquatorialToEcliptic( const dms *Obliquity ) {
findEcliptic( Obliquity, ep.longitude, ep.latitude );
}
void KSPlanetBase::EclipticToEquatorial( const dms *Obliquity ) {
setFromEcliptic( Obliquity, &ep.longitude, &ep.latitude );
}
void KSPlanetBase::updateCoords( KSNumbers *num, bool includePlanets, const dms *lat, const dms *LST ){
if ( includePlanets ) {
data->earth()->findPosition( num ); //since we don't pass lat & LST, localizeCoords will be skipped
if ( lat && LST ) {
findPosition( num, lat, LST, data->earth() );
if ( hasTrail() ) Trail.removeLast();
} else {
findGeocentricPosition( num, data->earth() );
}
}
}
void KSPlanetBase::findPosition( const KSNumbers *num, const dms *lat, const dms *LST, const KSPlanetBase *Earth ) {
findGeocentricPosition( num, Earth ); //private function, reimplemented in each subclass
if ( Earth ) setRearth( Earth );
if ( lat && LST )
localizeCoords( num, lat, LST ); //correct for figure-of-the-Earth
if ( hasTrail() ) {
Trail.append( new SkyPoint( ra(), dec() ) );
if ( Trail.count() > MAXTRAIL ) Trail.removeFirst();
}
if ( isMajorPlanet() )
findMagnitude(num);
}
bool KSPlanetBase::isMajorPlanet() const {
if ( name() == "Mercury" || name() == "Venus" || name() == "Mars" ||
name() == "Jupiter" || name() == "Saturn" || name() == "Uranus" ||
name() == "Neptune" || name() == "Pluto" )
return true;
return false;
}
void KSPlanetBase::localizeCoords( const KSNumbers *num, const dms *lat, const dms *LST ) {
//convert geocentric coordinates to local apparent coordinates (topocentric coordinates)
dms HA, HA2; //Hour Angle, before and after correction
double rsinp, rcosp, u, sinHA, cosHA, sinDec, cosDec, D;
double cosHA2;
double r = Rearth * AU_KM; //distance from Earth, in km
u = atan( 0.996647*tan( lat->radians() ) );
rsinp = 0.996647*sin( u );
rcosp = cos( u );
HA.setD( LST->Degrees() - ra()->Degrees() );
HA.SinCos( sinHA, cosHA );
dec()->SinCos( sinDec, cosDec );
D = atan( ( rcosp*sinHA )/( r*cosDec/6378.14 - rcosp*cosHA ) );
dms temp;
temp.setRadians( ra()->radians() - D );
setRA( temp );
HA2.setD( LST->Degrees() - ra()->Degrees() );
cosHA2 = cos( HA2.radians() );
temp.setRadians( atan( cosHA2*( r*sinDec/6378.14 - rsinp )/( r*cosDec*cosHA/6378.14 - rcosp ) ) );
setDec( temp );
EquatorialToEcliptic( num->obliquity() );
}
void KSPlanetBase::setRearth( const KSPlanetBase *Earth ) {
double sinL, sinB, sinL0, sinB0;
double cosL, cosB, cosL0, cosB0;
double x,y,z;
//The Moon's Rearth is set in its findGeocentricPosition()...
if ( name() == "Moon" ) {
return;
}
if ( name() == "Earth" ) {
Rearth = 0.0;
return;
}
if ( ! Earth && name() != "Moon" ) {
kdDebug() << i18n( "KSPlanetBase::setRearth(): Error: Need an Earth pointer. (" ) << name() << ")" << endl;
Rearth = 1.0;
return;
}
Earth->ecLong()->SinCos( sinL0, cosL0 );
Earth->ecLat()->SinCos( sinB0, cosB0 );
double eX = Earth->rsun()*cosB0*cosL0;
double eY = Earth->rsun()*cosB0*sinL0;
double eZ = Earth->rsun()*sinB0;
helEcLong()->SinCos( sinL, cosL );
helEcLat()->SinCos( sinB, cosB );
x = rsun()*cosB*cosL - eX;
y = rsun()*cosB*sinL - eY;
z = rsun()*sinB - eZ;
Rearth = sqrt(x*x + y*y + z*z);
//Set angular size, in arcmin
AngularSize = asin(PhysicalSize/Rearth/AU_KM)*60.*180./dms::PI;
}
void KSPlanetBase::updateTrail( dms *LST, const dms *lat ) {
for ( SkyPoint *sp = Trail.first(); sp; sp = Trail.next() )
sp->EquatorialToHorizontal( LST, lat );
}
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 = test.ra()->Degrees() - ra()->Degrees();
double dy = dec()->Degrees() - test.dec()->Degrees();
double pa;
if ( dy ) {
pa = atan( dx/dy )*180.0/dms::PI;
} else {
pa = 90.0;
if ( dx > 0 ) pa = -90.0;
}
setPA( pa );
}
void KSPlanetBase::rotateImage( double imAngle ) {
ImageAngle = imAngle;
TQWMatrix m;
m.rotate( ImageAngle );
Image = Image0.xForm( m );
}
void KSPlanetBase::scaleRotateImage( int scale, double imAngle ) {
ImageAngle = imAngle;
TQWMatrix m;
m.rotate( ImageAngle );
Image = Image0.xForm( m ).smoothScale( scale, scale );
}
void KSPlanetBase::findMagnitude(const KSNumbers *num) {
double cosDec, sinDec;
dec()->SinCos(cosDec, sinDec);
/* Phase of the planet in degrees */
double earthSun = 1.;
double cosPhase = (rsun()*rsun() + rearth()*rearth() - earthSun*earthSun)
/ (2 * rsun() * rearth() );
double phase = acos ( cosPhase ) * 180.0 / dms::PI;
/* Computation of the visual magnitude (V band) of the planet.
* Algorithm provided by Pere Planesas (Observatorio Astronomico Nacional)
* It has some simmilarity to J. Meeus algorithm in Astronomical Algorithms, Chapter 40.
* */
// Initialized to the faintest magnitude observable with the HST
float magnitude = 30;
double param = 5 * log10(rsun() * rearth() );
double f1 = phase/100.;
if ( name() == "Mercury" ) {
if ( phase > 150. ) f1 = 1.5;
magnitude = -0.36 + param + 3.8*f1 - 2.73*f1*f1 + 2*f1*f1*f1;
}
if ( name() =="Venus")
magnitude = -4.29 + param + 0.09*f1 + 2.39*f1*f1 - 0.65*f1*f1*f1;
if( name() == "Mars")
magnitude = -1.52 + param + 0.016*phase;
if( name() == "Jupiter")
magnitude = -9.25 + param + 0.005*phase;
if( name() == "Saturn") {
double T = num->julianCenturies();
double a0 = (40.66-4.695*T)* dms::PI / 180.;
double d0 = (83.52+0.403*T)* dms::PI / 180.;
double sinx = -cos(d0)*cosDec*cos(a0 - ra()->radians());
sinx = fabs(sinx-sin(d0)*sinDec);
double rings = -2.6*sinx + 1.25*sinx*sinx;
magnitude = -8.88 + param + 0.044*phase + rings;
}
if( name() == "Uranus")
magnitude = -7.19 + param + 0.0028*phase;
if( name() == "Neptune")
magnitude = -6.87 + param;
if( name() == "Pluto" )
magnitude = -1.01 + param + 0.041*phase;
setMag(magnitude);
}
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