summaryrefslogtreecommitdiffstats
path: root/kstars/kstars/skyobject.cpp
blob: 18decc7c9bb97f51932e5057f9b16865fafdf541 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
/***************************************************************************
                          skyobject.cpp  -  K Desktop Planetarium
                             -------------------
    begin                : Sun Feb 11 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 <iostream>

#include <kglobal.h>
#include <kstandarddirs.h>
#include <tqpoint.h>
#include <tqregexp.h>
#include <tqfile.h>
#include <tqtextstream.h>

#include "skyobject.h"
#include "starobject.h" //needed in saveUserLog()
#include "ksnumbers.h"
#include "dms.h"
#include "geolocation.h"
#include "kstarsdatetime.h"

TQString SkyObject::emptyString = TQString("");
TQString SkyObject::unnamedString = TQString(i18n("unnamed"));
TQString SkyObject::unnamedObjectString = TQString(i18n("unnamed object"));
TQString SkyObject::starString = TQString("star");

SkyObject::SkyObject( SkyObject &o ) : SkyPoint( o ) {
	setType( o.type() );
	Magnitude = o.mag();
	setName(o.name());
	setName2(o.name2());
	setLongName(o.longname());
	ImageList = o.ImageList;
	ImageTitle = o.ImageTitle;
	InfoList = o.InfoList;
	InfoTitle = o.InfoTitle;
}

SkyObject::SkyObject( int t, dms r, dms d, float m,
						TQString n, TQString n2, TQString lname ) : SkyPoint( r, d) {
	setType( t );
	Magnitude = m;
	Name = 0;
	setName(n);
	Name2 = 0;
	setName2(n2);
	LongName = 0;
	setLongName(lname);
}

SkyObject::SkyObject( int t, double r, double d, float m,
						TQString n, TQString n2, TQString lname ) : SkyPoint( r, d) {
	setType( t );
	Magnitude = m;
	Name = 0;
	setName(n);
	Name2 = 0;
	setName2(n2);
	LongName = 0;
	setLongName(lname);
}

SkyObject::~SkyObject() {
	delete Name;
	delete Name2;
	delete LongName;
}

void SkyObject::setLongName( const TQString &longname ) {
	delete LongName;
	if ( longname.isEmpty() ) {
		if ( hasName() )
			LongName = new TQString(translatedName());
		else if ( hasName2() )
			LongName = new TQString(*Name2);
		else
			LongName = 0;
	} else {
		LongName = new TQString(longname);
	}
}

TQTime SkyObject::riseSetTime( const KStarsDateTime &dt, const GeoLocation *geo, bool rst ) {
	//this object does not rise or set; return an invalid time
	if ( checkCircumpolar(geo->lat()) )
		return TQTime( 25, 0, 0 );

	//First of all, if the object is below the horizon at date/time dt, adjust the time 
	//to bring it above the horizon
	KStarsDateTime dt2 = dt;
	SkyPoint p = recomputeCoords( dt, geo );
	p.EquatorialToHorizontal( &(geo->GSTtoLST( dt.gst() )), geo->lat() );
	if ( p.alt()->Degrees() < 0.0 ) {
		if ( p.az()->Degrees() < 180.0 ) { //object has not risen yet
			dt2 = dt.addSecs( 12.*3600. );
		} else { //object has already set
			dt2 = dt.addSecs( -12.*3600. );
		}
	}
	
	return geo->UTtoLT( KStarsDateTime( dt2.date(), riseSetTimeUT( dt2, geo, rst ) ) ).time();
}

TQTime SkyObject::riseSetTimeUT( const KStarsDateTime &dt, const GeoLocation *geo, bool riseT ) {
	// First trial to calculate UT
	TQTime UT = auxRiseSetTimeUT( dt, geo, ra(), dec(), riseT );
	
	// We iterate once more using the calculated UT to compute again
	// the ra and dec for that time and hence the rise/set time.
	// Also, adjust the date by +/- 1 day, if necessary
	KStarsDateTime dt0 = dt;
	dt0.setTime( UT );
	if ( riseT && dt0 > dt ) {
		dt0 = dt0.addDays( -1 );
	} else if ( ! riseT && dt0 < dt ) {
		dt0 = dt0.addDays( 1 );
	}
	
	SkyPoint sp = recomputeCoords( dt0, geo );
	UT = auxRiseSetTimeUT( dt0, geo, sp.ra(), sp.dec(), riseT );

	// We iterate a second time (For the Moon the second iteration changes
	// aprox. 1.5 arcmin the coordinates).
	dt0.setTime( UT );
	sp = recomputeCoords( dt0, geo );
	UT = auxRiseSetTimeUT( dt0, geo, sp.ra(), sp.dec(), riseT );
	return UT;
}

dms SkyObject::riseSetTimeLST( const KStarsDateTime &dt, const GeoLocation *geo, bool riseT ) {
	KStarsDateTime rst( dt.date(), riseSetTimeUT( dt, geo, riseT) );
	return geo->GSTtoLST( rst.gst() );
}

TQTime SkyObject::auxRiseSetTimeUT( const KStarsDateTime &dt, const GeoLocation *geo,
			const dms *righta, const dms *decl, bool riseT) {
	dms LST = auxRiseSetTimeLST( geo->lat(), righta, decl, riseT );
	return dt.GSTtoUT( geo->LSTtoGST( LST ) );
}

dms SkyObject::auxRiseSetTimeLST( const dms *gLat, const dms *righta, const dms *decl, bool riseT ) {
	dms h0 = elevationCorrection();
	double H = approxHourAngle ( &h0, gLat, decl );
	dms LST;

	if ( riseT )
		LST.setH( 24.0 + righta->Hours() - H/15.0 );
	else
		LST.setH( righta->Hours() + H/15.0 );

	return LST.reduce();
}


dms SkyObject::riseSetTimeAz( const KStarsDateTime &dt, const GeoLocation *geo, bool riseT ) {
	dms Azimuth;
	double AltRad, AzRad;
	double sindec, cosdec, sinlat, coslat, sinHA, cosHA;
	double sinAlt, cosAlt;

	TQTime UT = riseSetTimeUT( dt, geo, riseT );
	KStarsDateTime dt0 = dt;
	dt0.setTime( UT );
	SkyPoint sp = recomputeCoords( dt0, geo );
	const dms *ram = sp.ra0();
	const dms *decm = sp.dec0();

	dms LST = auxRiseSetTimeLST( geo->lat(), ram, decm, riseT );
	dms HourAngle = dms( LST.Degrees() - ram->Degrees() );

	geo->lat()->SinCos( sinlat, coslat );
	dec()->SinCos( sindec, cosdec );
	HourAngle.SinCos( sinHA, cosHA );

	sinAlt = sindec*sinlat + cosdec*coslat*cosHA;
	AltRad = asin( sinAlt );
	cosAlt = cos( AltRad );

	AzRad = acos( ( sindec - sinlat*sinAlt )/( coslat*cosAlt ) );
	if ( sinHA > 0.0 ) AzRad = 2.0*dms::PI - AzRad; // resolve acos() ambiguity
	Azimuth.setRadians( AzRad );

	return Azimuth;
}

TQTime SkyObject::transitTimeUT( const KStarsDateTime &dt, const GeoLocation *geo ) {
	dms LST = geo->GSTtoLST( dt.gst() );

	//dSec is the number of seconds until the object transits.
	dms HourAngle = dms( LST.Degrees() - ra()->Degrees() );
	int dSec = int( -3600.*HourAngle.Hours() );

	//dt0 is the first guess at the transit time.
	KStarsDateTime dt0 = dt.addSecs( dSec );

	//recompute object's position at UT0 and then tqfind
	//transit time of this refined position
	SkyPoint sp = recomputeCoords( dt0, geo );
	const dms *ram = sp.ra0();

	HourAngle = dms ( LST.Degrees() - ram->Degrees() );
	dSec = int( -3600.*HourAngle.Hours() );

	return dt.addSecs( dSec ).time();
}

TQTime SkyObject::transitTime( const KStarsDateTime &dt, const GeoLocation *geo ) {
	return geo->UTtoLT( KStarsDateTime( dt.date(), transitTimeUT( dt, geo ) ) ).time();
}

dms SkyObject::transitAltitude( const KStarsDateTime &dt, const GeoLocation *geo ) {
	KStarsDateTime dt0 = dt;
	TQTime UT = transitTimeUT( dt, geo );
	dt0.setTime( UT );
	SkyPoint sp = recomputeCoords( dt0, geo );
	const dms *decm = sp.dec0();

	dms delta;
	delta.setRadians( asin ( sin (geo->lat()->radians()) *
				sin ( decm->radians() ) +
				cos (geo->lat()->radians()) *
				cos (decm->radians() ) ) );

	return delta;
}

double SkyObject::approxHourAngle( const dms *h0, const dms *gLat, const dms *dec ) {

	double sh0 = sin ( h0->radians() );
	double r = (sh0 - sin( gLat->radians() ) * sin(dec->radians() ))
		 / (cos( gLat->radians() ) * cos( dec->radians() ) );

	double H = acos( r )/dms::DegToRad;

	return H;
}

dms SkyObject::elevationCorrection(void) {

	/* The atmospheric refraction at the horizon shifts altitude by 
	 * - 34 arcmin = 0.5667 degrees. This value changes if the observer
	 * is above the horizon, or if the weather conditions change much.
	 *
	 * For the sun we have to add half the angular sie of the body, since
	 * the sunset is the time the upper limb of the sun disappears below
	 * the horizon, and dawn, when the upper part of the limb appears 
	 * over the horizon. The angular size of the sun = angular size of the
	 * moon = 31' 59''. 
	 *
	 * So for the sun the correction is = -34 - 16 = 50 arcmin = -0.8333
	 *
	 * This same correction should be applied to the moon however parallax
	 * is important here. Meeus states that the correction should be 
	 * 0.7275 P - 34 arcmin, where P is the moon's horizontal parallax. 
	 * He proposes a mean value of 0.125 degrees if no great accuracy 
	 * is needed.
	 */

	if ( name() == "Sun" || name() == "Moon" )
		return dms(-0.8333);
//	else if ( name() == "Moon" )
//		return dms(0.125);       
	else                             // All sources point-like.
		return dms(-0.5667);
}

SkyPoint SkyObject::recomputeCoords( const KStarsDateTime &dt, const GeoLocation *geo ) {
	//store current position
	SkyPoint original( ra(), dec() );

	// compute coords for new time jd
	KSNumbers num( dt.djd() );
	if ( isSolarSystem() && geo ) {
		dms LST = geo->GSTtoLST( dt.gst() );
		updateCoords( &num, true, geo->lat(), &LST );
	} else {
		updateCoords( &num );
	}

	//the coordinates for the date dt:
	SkyPoint sp = SkyPoint( ra(), dec() );

	// restore original coords
	setRA( original.ra()->Hours() );
	setDec( original.dec()->Degrees() );

	return sp;
}

bool SkyObject::checkCircumpolar( const dms *gLat ) {
	double r = -1.0 * tan( gLat->radians() ) * tan( dec()->radians() );
	if ( r < -1.0 || r > 1.0 )
		return true;
	else
		return false;
}

TQString SkyObject::typeName( void ) const {
	if ( Type==0 ) return i18n( "Star" );
	else if ( Type==1 ) return i18n( "Catalog Star" );
	else if ( Type==2 ) return i18n( "Planet" );
	else if ( Type==3 ) return i18n( "Open Cluster" );
	else if ( Type==4 ) return i18n( "Globular Cluster" );
	else if ( Type==5 ) return i18n( "Gaseous Nebula" );
	else if ( Type==6 ) return i18n( "Planetary Nebula" );
	else if ( Type==7 ) return i18n( "Supernova Remnant" );
	else if ( Type==8 ) return i18n( "Galaxy" );
	else if ( Type==9 ) return i18n( "Comet" );
	else if ( Type==10 ) return i18n( "Asteroid" );
	else return i18n( "Unknown Type" );
}
void SkyObject::setName( const TQString &name ) {
//	if (name == "star" ) kdDebug() << "name == star" << endl;
	delete Name;
	if (!name.isEmpty())
		Name = new TQString(name);
	else
		{ Name = 0; /*kdDebug() << "name saved" << endl;*/ }
}

void SkyObject::setName2( const TQString &name2 ) {
	delete Name2;
	if (!name2.isEmpty())
		Name2 = new TQString(name2);
	else
		{ Name2 = 0; /*kdDebug() << "name2 saved" << endl;*/ }
}

TQString SkyObject::messageFromTitle( const TQString &imageTitle ) {
	TQString message = imageTitle;

	//HST Image
	if ( imageTitle == i18n( "Show HST Image" ) || imageTitle.tqcontains("HST") ) {
		message = i18n( "%1: Hubble Space Telescope, operated by STScI for NASA [public domain]" ).tqarg( longname() );  

	//Spitzer Image
	} else if ( imageTitle.tqcontains( i18n( "Show Spitzer Image" ) ) ) {
		message = i18n( "%1: Spitzer Space Telescope, courtesy NASA/JPL-Caltech [public domain]" ).tqarg( longname() );  

	//SEDS Image
	} else if ( imageTitle == i18n( "Show SEDS Image" ) ) {
		message = i18n( "%1: SEDS, http://www.seds.org [free for non-commercial use]" ).tqarg( longname() );

	//Kitt Peak AOP Image
	} else if ( imageTitle == i18n( "Show KPNO AOP Image" ) ) {
		message = i18n( "%1: Advanced Observing Program at Kitt Peak National Observatory [free for non-commercial use; no physical reproductions]" ).tqarg( longname() );

	//NOAO Image
	} else if ( imageTitle.tqcontains( i18n( "Show NOAO Image" ) ) ) {
		message = i18n( "%1: National Optical Astronomy Observatories and AURA [free for non-commercial use]" ).tqarg( longname() );

	//VLT Image
	} else if ( imageTitle.tqcontains( "VLT" ) ) {
		message = i18n( "%1: Very Large Telescope, operated by the European Southern Observatory [free for non-commercial use; no reproductions]" ).tqarg( longname() );

	//All others
	} else if ( imageTitle.startsWith( i18n( "Show" ) ) ) {
		message = imageTitle.mid( imageTitle.tqfind( " " ) + 1 ); //eat first word, "Show"
		message = longname() + ": " + message;
	}
	
	return message;
}

//New saveUserLog, moved from DetailDialog.  
//Should create a special UserLog widget that encapsulates the "default"
//message in the widget when no log exists (much like we do with dmsBox now)
void SkyObject::saveUserLog( const TQString &newLog ) {
	TQFile file;
	TQString logs; //existing logs
	
	//Do nothing if new log is the "default" message
	//(keep going if new log is empty; we'll want to delete its current entry)
	if ( newLog == (i18n("Record here observation logs and/or data on %1.").tqarg(name())) || newLog.isEmpty() )
		return;

	// header label
	TQString KSLabel ="[KSLABEL:" + name() + "]";
	//However, we can't accept a star name if it has a greek letter in it:
	if ( type() == STAR ) {
		StarObject *star = (StarObject*)this;
		if ( name() == star->gname() ) 
			KSLabel = "[KSLABEL:" + star->gname( false ) + "]"; //"false": spell out greek letter
	}
	
	file.setName( locateLocal( "appdata", "userlog.dat" ) ); //determine filename in local user KDE directory tree.
	if ( file.open( IO_ReadOnly)) {
		TQTextStream instream(&file);
		// read all data into memory
		logs = instream.read();
		file.close();
	}
	
	//Remove old log entry from the logs text
	if ( ! userLog.isEmpty() ) {
		int startIndex, endIndex;
		TQString sub;
	
		startIndex = logs.tqfind(KSLabel);
		sub = logs.mid (startIndex);
		endIndex = sub.tqfind("[KSLogEnd]");
	
		logs.remove(startIndex, endIndex + 11);
	}
	
	//append the new log entry to the end of the logs text,
	//but only if the log is not empty
	if ( ! newLog.stripWhiteSpace().isEmpty() )
		logs.append( KSLabel + "\n" + newLog + "\n[KSLogEnd]\n" );
	
	//Open file for writing
	//FIXME: change error message to "cannot write to user log file"
	if ( !file.open( IO_WriteOnly ) ) {
		kdDebug() << i18n( "user log file could not be opened." ) << endl;
		return;
	}
	
	//Write new logs text
	TQTextStream outstream(&file);
	outstream << logs;
	
	//Set the log text in the object itself.
	userLog = newLog;
	
	file.close();
}