2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2006-2007, Guilhem Bonnefille <guilhem.bonnefille@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #define DEGREE_SYMBOL "\302\260"
34 * @param pos_c char for positive value
35 * @param neg_c char for negative value
37 static gchar *convert_dec_to_ddd(gdouble dec, gchar pos_c, gchar neg_c)
54 result = g_strdup_printf ( "%c%f" DEGREE_SYMBOL, sign_c, val_d );
58 gchar *convert_lat_dec_to_ddd(gdouble lat)
60 return convert_dec_to_ddd(lat, 'N', 'S');
63 gchar *convert_lon_dec_to_ddd(gdouble lon)
65 return convert_dec_to_ddd(lon, 'E', 'W');
69 * @param pos_c char for positive value
70 * @param neg_c char for negative value
72 static gchar *convert_dec_to_dmm(gdouble dec, gchar pos_c, gchar neg_c)
92 val_m = (tmp - val_d) * 60;
95 result = g_strdup_printf ( "%c%d" DEGREE_SYMBOL "%f'",
96 sign_c, val_d, val_m );
100 gchar *convert_lat_dec_to_dmm(gdouble lat)
102 return convert_dec_to_dmm(lat, 'N', 'S');
105 gchar *convert_lon_dec_to_dmm(gdouble lon)
107 return convert_dec_to_dmm(lon, 'E', 'W');
111 * @param pos_c char for positive value
112 * @param neg_c char for negative value
114 static gchar *convert_dec_to_dms(gdouble dec, gchar pos_c, gchar neg_c)
120 gchar *result = NULL;
134 tmp = (tmp - val_d) * 60;
138 val_s = (tmp - val_m) * 60;
141 result = g_strdup_printf ( "%c%d" DEGREE_SYMBOL "%d'%.4f\"",
142 sign_c, val_d, val_m, val_s );
146 gchar *convert_lat_dec_to_dms(gdouble lat)
148 return convert_dec_to_dms(lat, 'N', 'S');
151 gchar *convert_lon_dec_to_dms(gdouble lon)
153 return convert_dec_to_dms(lon, 'E', 'W');
156 gdouble convert_dms_to_dec(const gchar *dms)
158 gdouble d = 0.0; /* Degree */
159 gdouble m = 0.0; /* Minutes */
160 gdouble s = 0.0; /* Seconds */
166 const gchar *ptr, *endptr;
169 // It is negative if:
170 // - the '-' sign occurs
171 // - it is a west longitude or south latitude
172 if (strpbrk (dms, "-wWsS") != NULL)
175 // Peek the différent components
179 ptr = strpbrk (endptr, "0123456789,.");
181 value = g_strtod((const gchar *)ptr, (gchar **)&endptr);
195 } while (ptr != NULL && endptr != NULL);
198 // Compute the result
199 result = d + m/60 + s/3600;
201 if (neg) result = - result;