shumate/shumate-location.c
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (C) 2011-2013 Jiri Techet <techet@gmail.com> | ||
| 3 | * Copyright (C) 2019 Marcus Lundblad <ml@update.uu.se> | ||
| 4 | * | ||
| 5 | * This library is free software; you can redistribute it and/or | ||
| 6 | * modify it under the terms of the GNU Lesser General Public | ||
| 7 | * License as published by the Free Software Foundation; either | ||
| 8 | * version 2.1 of the License, or (at your option) any later version. | ||
| 9 | * | ||
| 10 | * This library is distributed in the hope that it will be useful, | ||
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 13 | * Lesser General Public License for more details. | ||
| 14 | * | ||
| 15 | * You should have received a copy of the GNU Lesser General Public | ||
| 16 | * License along with this library; if not, write to the Free Software | ||
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 18 | */ | ||
| 19 | |||
| 20 | /** | ||
| 21 | * ShumateLocation: | ||
| 22 | * | ||
| 23 | * An interface common to objects having latitude and longitude | ||
| 24 | * | ||
| 25 | * By implementing #ShumateLocation the object declares that it has latitude | ||
| 26 | * and longitude and can be used to specify location on the map. | ||
| 27 | */ | ||
| 28 | |||
| 29 | #include <math.h> | ||
| 30 | |||
| 31 | #include "shumate-location.h" | ||
| 32 | |||
| 33 |
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53 | G_DEFINE_INTERFACE (ShumateLocation, shumate_location, G_TYPE_OBJECT); |
| 34 | |||
| 35 | |||
| 36 | static void | ||
| 37 | 8 | shumate_location_default_init (ShumateLocationInterface *iface) | |
| 38 | { | ||
| 39 | /** | ||
| 40 | * ShumateLocation:longitude: | ||
| 41 | * | ||
| 42 | * The longitude coordinate in degrees | ||
| 43 | */ | ||
| 44 | 8 | g_object_interface_install_property (iface, | |
| 45 | g_param_spec_double ("longitude", NULL, NULL, | ||
| 46 | -180.0f, | ||
| 47 | 180.0f, | ||
| 48 | 0.0f, | ||
| 49 | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); | ||
| 50 | |||
| 51 | /** | ||
| 52 | * ShumateLocation:latitude: | ||
| 53 | * | ||
| 54 | * The latitude coordinate in degrees | ||
| 55 | */ | ||
| 56 | 8 | g_object_interface_install_property (iface, | |
| 57 | g_param_spec_double ("latitude", NULL, NULL, | ||
| 58 | -90.0f, | ||
| 59 | 90.0f, | ||
| 60 | 0.0f, | ||
| 61 | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); | ||
| 62 | 8 | } | |
| 63 | |||
| 64 | |||
| 65 | /** | ||
| 66 | * shumate_location_set_location: | ||
| 67 | * @location: a #ShumateLocation | ||
| 68 | * @latitude: the latitude in degrees | ||
| 69 | * @longitude: the longitude in degrees | ||
| 70 | * | ||
| 71 | * Sets the coordinates of the location | ||
| 72 | */ | ||
| 73 | void | ||
| 74 | 8 | shumate_location_set_location (ShumateLocation *location, | |
| 75 | double latitude, | ||
| 76 | double longitude) | ||
| 77 | { | ||
| 78 | 8 | SHUMATE_LOCATION_GET_IFACE (location)->set_location (location, | |
| 79 | latitude, | ||
| 80 | longitude); | ||
| 81 | 8 | } | |
| 82 | |||
| 83 | |||
| 84 | /** | ||
| 85 | * shumate_location_get_latitude: | ||
| 86 | * @location: a #ShumateLocation | ||
| 87 | * | ||
| 88 | * Gets the latitude coordinate in degrees. | ||
| 89 | * | ||
| 90 | * Returns: the latitude coordinate in degrees. | ||
| 91 | */ | ||
| 92 | double | ||
| 93 | 16 | shumate_location_get_latitude (ShumateLocation *location) | |
| 94 | { | ||
| 95 | 16 | return SHUMATE_LOCATION_GET_IFACE (location)->get_latitude (location); | |
| 96 | } | ||
| 97 | |||
| 98 | |||
| 99 | /** | ||
| 100 | * shumate_location_get_longitude: | ||
| 101 | * @location: a #ShumateLocation | ||
| 102 | * | ||
| 103 | * Gets the longitude coordinate in degrees. | ||
| 104 | * | ||
| 105 | * Returns: the longitude coordinate in degrees. | ||
| 106 | */ | ||
| 107 | double | ||
| 108 | 16 | shumate_location_get_longitude (ShumateLocation *location) | |
| 109 | { | ||
| 110 | 16 | return SHUMATE_LOCATION_GET_IFACE (location)->get_longitude (location); | |
| 111 | } | ||
| 112 | |||
| 113 | #define EARTH_RADIUS 6378137.0 /* meters, Equatorial radius */ | ||
| 114 | |||
| 115 | /** | ||
| 116 | * shumate_location_distance: | ||
| 117 | * @self: a [iface@Location] | ||
| 118 | * @other: a [iface@Location] | ||
| 119 | * | ||
| 120 | * Calculates the distance in meters between two locations. | ||
| 121 | * | ||
| 122 | * This function uses the great-circle distance formula, which assumes | ||
| 123 | * Earth is a perfect sphere. This limits the accuracy of the result, | ||
| 124 | * but is good enough for most purposes. | ||
| 125 | * | ||
| 126 | * Returns: the distance in meters between @self and @other | ||
| 127 | * | ||
| 128 | * Since: 1.2 | ||
| 129 | */ | ||
| 130 | double | ||
| 131 | 8 | shumate_location_distance (ShumateLocation *self, ShumateLocation *other) | |
| 132 | { | ||
| 133 | 8 | double distance; | |
| 134 | 8 | double lat1 = shumate_location_get_latitude (self) * G_PI / 180.0f; | |
| 135 | 8 | double lon1 = shumate_location_get_longitude (self) * G_PI / 180.0f; | |
| 136 | 8 | double lat2 = shumate_location_get_latitude (other) * G_PI / 180.0f; | |
| 137 | 8 | double lon2 = shumate_location_get_longitude (other) * G_PI / 180.0f; | |
| 138 | |||
| 139 | 8 | distance = acos (sin (lat1) * sin (lat2) + cos (lat1) * cos (lat2) * cos (lon2 - lon1)) * EARTH_RADIUS; | |
| 140 | |||
| 141 |
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8 | if (isnan(distance)) |
| 142 | return 0; | ||
| 143 | else | ||
| 144 | 8 | return distance; | |
| 145 | } | ||
| 146 |