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/****************************************************************************
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Xplanet 0.94 - render an image of a planet into an X window
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Copyright (C) 2002 Hari Nair <hari@alumni.caltech.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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****************************************************************************/
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#include "Satellite.h"
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static list<Satellite> full_satellite_list; // need this for -sattrackid
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satelliteFileExists(string &filename)
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cout << "\nLooking for satellite file ...\n"
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if (fileExists(filename)) return(true);
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string satellite_file = "satellites";
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satellite_file += separator;
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satellite_file += filename;
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if (fileExists(satellite_file))
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filename = satellite_file;
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satellite_file = prefix;
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satellite_file += separator;
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satellite_file += "satellites";
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satellite_file += separator;
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satellite_file += filename;
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if (fileExists(satellite_file))
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filename = satellite_file;
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// Given an value X and radius d, this routine draws a half-circle in
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// the plane where X is constant.
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drawAltitudeHalfCirc(const double rot[3][3], const double X, const double d,
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bool Z_positive, const string arcopts, ofstream &sat_a)
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double Z = (1 - X*X - Y*Y);
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if (fabs(Z) < 1e-5) Z = 0;
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Z = (Z_positive ? sqrt(Z) : -sqrt(Z));
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point.setXYZ(X, Y, Z);
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point.rectangularToSpherical();
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for (double siny = 1; siny >= -1; siny -= 1./10.)
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double prev_lat = point.lat;
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double prev_lon = point.lon;
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Y = sin(M_PI_2 * siny) * d;
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if (fabs(Z) < 1e-5) Z = 0;
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Z = (Z_positive ? sqrt(Z) : -sqrt(Z));
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point.setXYZ(X, Y, Z);
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point.rectangularToSpherical();
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sat_a << prev_lat/deg_to_rad << '\t' << prev_lon/deg_to_rad
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<< '\t' << point.lat/deg_to_rad
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<< '\t' << point.lon/deg_to_rad;
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if (!arcopts.empty()) sat_a << " " << arcopts;
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// write the entry in the marker/arc file for this satellite
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writeSatFiles(Satellite *this_sat, char *options,
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ofstream &sat_a, ofstream &sat_m)
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list<double> altcirc;
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int fontsize = opts.fontsize;
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string name = this_sat->getName();
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char *returnstring = NULL;
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int trail_type = ORBIT;
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int trail_interval = 1;
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bool end_of_line = false;
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bool syntax_error = false;
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switch (parse(i, options, returnstring))
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if (returnstring == NULL) break;
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switch (returnstring[0])
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cerr << "Unrecognized option for align in "
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<< "satellite file" << endl;
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if (returnstring == NULL) break;
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sscanf(returnstring, "%lf", &angle);
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if (angle < 0) angle *= -1;
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if (angle > 90) angle = 90;
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altcirc.push_back(angle * deg_to_rad);
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if (returnstring == NULL) break;
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color.assign(returnstring);
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arcopts += (" color=" + color);
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if (returnstring == NULL) break;
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font.assign(returnstring);
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if (returnstring == NULL) break;
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sscanf(returnstring, "%d", &fontsize);
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if (fontsize < 0) fontsize = opts.fontsize;
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if (returnstring == NULL) break;
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image.assign(returnstring);
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if (returnstring == NULL) break;
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name.assign(returnstring);
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if (returnstring == NULL) break;
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sscanf(returnstring, "%f", &spacing);
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if (spacing < 0.001) spacing = 0.001;
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arcopts += " spacing=";
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arcopts += returnstring;
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char *ptr = returnstring;
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while (ptr[0] != ',')
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if (syntax_error) break;
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if (!sscanf(++ptr, "%d,%d,%d", &trail_start, &trail_end,
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&trail_interval) == 3)
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cerr << "Need four values for trail{}!\n";
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switch (returnstring[0])
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cerr << "Unknown type of orbit trail!\n";
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if (trail_interval < 1) trail_interval = 1;
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if (returnstring == NULL) break;
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transparency.assign(returnstring);
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if (!sscanf(returnstring, "%d,%d,%d", &r, &g, &b) == 3)
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cerr << "Need three values for transparency pixel!\n";
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if (returnstring != NULL)
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delete [] returnstring;
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cerr << "Syntax error in satellite file\n"
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<< "line is \"" << this_sat->getID() << " " << options
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const double EARTH_RADIUS = 6378.140;
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// Reload TLE data here since select_ephemeris() in libsgp4sdp4
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// changes it. This is in case the user wants to have two entries
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// with the same satellite.
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time_t start_time = (time_t) (opts.time.tv_sec + trail_start * 60);
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time_t end_time = (time_t) (opts.time.tv_sec + trail_end * 60);
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time_t interval = (time_t) (trail_interval * 60);
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if (start_time > end_time)
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time_t tmp = start_time;
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start_time = end_time;
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double lat = 0, lon = 0, alt = 0;
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this_sat->getSpherical(start_time, lat, lon, alt);
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for (time_t t = start_time + interval; t <= end_time; t += interval)
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double prev_lat = lat;
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double prev_lon = lon;
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double prev_alt = alt;
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this_sat->getSpherical(t, lat, lon, alt);
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sat_a << prev_lat/deg_to_rad << '\t' << prev_lon/deg_to_rad
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<< '\t' << lat/deg_to_rad << '\t' << lon/deg_to_rad;
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if (!arcopts.empty()) sat_a << " " << arcopts;
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if (trail_type == ORBIT)
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sat_a << " radius=" << 1 + prev_alt/EARTH_RADIUS
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<< " radius=" << 1 + alt/EARTH_RADIUS;
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this_sat->getSpherical((time_t) opts.time.tv_sec, lat, lon, alt);
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sat_m << lat/deg_to_rad << ' ' << lon/deg_to_rad;
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if (trail_type == ORBIT)
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sat_m << " radius=" << 1 + alt/EARTH_RADIUS;
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cerr << "Unknown alignment????\n";
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if (!color.empty()) sat_m << " color=" << color;
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if (!font.empty()) sat_m << " font=" << font;
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if (fontsize != opts.fontsize) sat_m << " fontsize=" << fontsize;
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if (!image.empty()) sat_m << " image=" << image;
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if (!name.empty()) sat_m << " {" << name << "}";
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if (!transparency.empty())
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sat_m << " transparent={" << transparency << "}";
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// Distance of satellite from Earth's center, in units of Earth radii
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double Rs = 1 + alt/EARTH_RADIUS;
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rotateXYZ(rot, 0, lat, -lon);
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list<double>::iterator a = altcirc.begin();
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while (a != altcirc.end())
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double phi = asin(sin(*a) / Rs);
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double X = -cos(*a + phi);
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double d = sin(*a + phi);
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drawAltitudeHalfCirc(rot, X, d, true, arcopts, sat_a);
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drawAltitudeHalfCirc(rot, X, d, false, arcopts, sat_a);
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readSatFileLine(const char *line, list<Satellite> &satellite_list,
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Satellite *&this_sat, char *&options)
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while (isDelimiter(line[i])) i++;
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if (isEndOfLine(line[i])) return(-1);
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sscanf(line + i, "%d", &id);
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while (!(isDelimiter(line[i]) || isEndOfLine(line[i]))) i++;
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list<Satellite>::iterator p = satellite_list.begin();
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while (p != satellite_list.end())
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if (id == p->getID())
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cout << "Found ID #" << id << " ("
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<< this_sat->getName() << ")\n";
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if (this_sat == NULL)
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cerr << "Satellite ID #" << id << " not found in TLE file\n";
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strcpy(options, line + i);
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// Run through the list of satellite files and check to see that
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// they exist, along with the corresponding TLE files.
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list<string> remove_list;
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list<string>::iterator p = opts.satellitefile.begin();
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while(p != opts.satellitefile.end())
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if (satelliteFileExists(*p))
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string tlefile = *p + ".tle";
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if (!satelliteFileExists(tlefile))
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cerr << "Can't open TLE file " << tlefile << endl;
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remove_list.push_back(*p);
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cerr << "Can't open satellite file " << *p << endl;
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remove_list.push_back(*p);
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p = remove_list.begin();
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while (p != remove_list.end())
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opts.satellitefile.remove(*p);
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createSatelliteList()
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list<string>::iterator p = opts.satellitefile.begin();
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while(p != opts.satellitefile.end())
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string tlefile = *p + ".tle";
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ifstream infile(tlefile.c_str());
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while (infile.getline(lines[0], 80) != NULL)
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if ((infile.getline(lines[1], 80) == NULL)
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|| (infile.getline(lines[2], 80) == NULL))
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cerr << "Malformed TLE file?\n";
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Satellite sat(lines);
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if (!sat.isGoodData())
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cerr << "Bad TLE data\n";
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if (opts.debug) cout << "Read satellite with ID "
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<< sat.getID() << endl;
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full_satellite_list.push_back(sat);
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createSatelliteFiles(string tmpdir)
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list<string>::iterator p = opts.satellitefile.begin();
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while(p != opts.satellitefile.end())
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list<Satellite> satellite_list;
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list<Satellite> zero_list;
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string tlefile = *p + ".tle";
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if (opts.debug) cout << "Opening TLE file " << tlefile << endl;
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ifstream infile(tlefile.c_str());
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while (infile.getline(lines[0], 80) != NULL)
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if ((infile.getline(lines[1], 80) == NULL)
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|| (infile.getline(lines[2], 80) == NULL))
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cerr << "Malformed TLE file?\n";
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Satellite sat(lines);
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if (!sat.isGoodData())
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cerr << "Bad TLE data\n";
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if (opts.debug) cout << "Read ID " << sat.getID() << endl;
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satellite_list.push_back(sat);
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zero_list.push_back(sat);
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// Now write one marker and one great arc file for each
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int digits = (int) (log10((double) opts.satellitefile.size())
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sprintf(pid, "%5.5d-%.*d", ((int) (getpid() % 10000)),
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string sat_markers = (tmpdir + separator
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+ "xplanet-markers." + pid);
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string sat_arcs = tmpdir + separator + "xplanet-arcs." + pid;
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ofstream sat_a(sat_arcs.c_str());
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ofstream sat_m(sat_markers.c_str());
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if (opts.debug) cout << "Opening satellite file " << *p << endl;
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infile.open(p->c_str());
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// Now read each line and write the appropriate entry to
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// the marker/arc files
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char *line = new char[256];
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char *zero_options = NULL;
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while (infile.getline(line, 256, '\n') != NULL)
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Satellite *this_sat = NULL;
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char *options = new char[256];
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int id = readSatFileLine(line, satellite_list,
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if (zero_options == NULL)
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zero_options = new char[256];
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strcpy(zero_options, options);
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cerr << "ID 0 already specified in satellite file\n";
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writeSatFiles(this_sat, options, sat_a, sat_m);
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zero_list.remove(*this_sat);
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if (zero_options != NULL)
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list<Satellite>::iterator p2 = zero_list.begin();
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while (p2 != zero_list.end())
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writeSatFiles(&(*p2), zero_options, sat_a, sat_m);
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delete [] zero_options;
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opts.markerfile.push_back(sat_markers);
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opts.greatarcfile.push_back(sat_arcs);
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cleanupSatelliteFiles(string tmpdir)
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list<string>::iterator p = opts.satellitefile.begin();
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while(p != opts.satellitefile.end())
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int digits = (int) (log10((double) opts.satellitefile.size())
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sprintf(pid, "%5.5d-%.*d", ((int) (getpid() % 10000)),
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string sat_markers = tmpdir + separator + "xplanet-markers." + pid;
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string sat_arcs = tmpdir + separator + "xplanet-arcs." + pid;
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unlink(sat_markers.c_str());
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unlink(sat_arcs.c_str());
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getSatLocation(const int id, const time_t time, double &lat, double &lon,
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Satellite *this_sat = NULL;
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list<Satellite>::iterator p = full_satellite_list.begin();
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while (p != full_satellite_list.end())
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if (id == p->getID())
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cout << "Found ID #" << id << " (" << this_sat->getName()
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if (this_sat == NULL)
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if (opts.satellitefile.size() == 0)
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cerr << "A TLE file must be specified using the "
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<< "-satfile option.\n";
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cerr << "Satellite ID #" << id << " not found in TLE file\n";
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// Reload TLE data here since select_ephemeris() in libsgp4sdp4
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// changes it. This is in case the user wants to have two entries
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// with the same satellite.
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this_sat->getSpherical(time, lat, lon, alt);
added
removed
libannotate/drawSatellite.cc
