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50a14534 EB |
1 | /* |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | * | |
20 | */ | |
21 | ||
50a14534 EB |
22 | #include "coords.h" |
23 | #include "vikcoord.h" | |
24 | ||
25 | /* all coord operations MUST BE ABSTRACTED!!! */ | |
26 | ||
27 | void vik_coord_convert(VikCoord *coord, VikCoordMode dest_mode) | |
28 | { | |
06fe50c3 | 29 | VikCoord tmp; |
50a14534 EB |
30 | if ( coord->mode != dest_mode ) |
31 | { | |
32 | if ( dest_mode == VIK_COORD_LATLON ) { | |
33 | a_coords_utm_to_latlon ( (struct UTM *)coord, (struct LatLon *)&tmp ); | |
34 | *((struct LatLon *)coord) = *((struct LatLon *)&tmp); | |
35 | } else { | |
36 | a_coords_latlon_to_utm ( (struct LatLon *)coord, (struct UTM *)&tmp ); | |
37 | *((struct UTM *)coord) = *((struct UTM *)&tmp); | |
38 | } | |
39 | coord->mode = dest_mode; | |
40 | } | |
41 | } | |
42 | ||
43 | void vik_coord_copy_convert(const VikCoord *coord, VikCoordMode dest_mode, VikCoord *dest) | |
44 | { | |
45 | if ( coord->mode == dest_mode ) { | |
46 | *dest = *coord; | |
47 | } else { | |
48 | if ( dest_mode == VIK_COORD_LATLON ) | |
49 | a_coords_utm_to_latlon ( (struct UTM *)coord, (struct LatLon *)dest ); | |
50 | else | |
51 | a_coords_latlon_to_utm ( (struct LatLon *)coord, (struct UTM *)dest ); | |
52 | dest->mode = dest_mode; | |
53 | } | |
54 | } | |
55 | ||
56 | static gdouble vik_coord_diff_safe(const VikCoord *c1, const VikCoord *c2) | |
57 | { | |
06fe50c3 | 58 | struct LatLon a, b; |
50a14534 EB |
59 | vik_coord_to_latlon ( c1, &a ); |
60 | vik_coord_to_latlon ( c2, &b ); | |
61 | return a_coords_latlon_diff ( &a, &b ); | |
62 | } | |
63 | ||
64 | gdouble vik_coord_diff(const VikCoord *c1, const VikCoord *c2) | |
65 | { | |
66 | if ( c1->mode == c2->mode ) | |
67 | return vik_coord_diff_safe ( c1, c2 ); | |
68 | if ( c1->mode == VIK_COORD_UTM ) | |
69 | return a_coords_utm_diff ( (const struct UTM *) c1, (const struct UTM *) c2 ); | |
70 | else | |
71 | return a_coords_latlon_diff ( (const struct LatLon *) c1, (const struct LatLon *) c2 ); | |
72 | } | |
73 | ||
74 | void vik_coord_load_from_latlon ( VikCoord *coord, VikCoordMode mode, const struct LatLon *ll ) | |
75 | { | |
76 | if ( mode == VIK_COORD_LATLON ) | |
77 | *((struct LatLon *)coord) = *ll; | |
78 | else | |
79 | a_coords_latlon_to_utm ( ll, (struct UTM *) coord ); | |
80 | coord->mode = mode; | |
81 | } | |
82 | ||
83 | void vik_coord_load_from_utm ( VikCoord *coord, VikCoordMode mode, const struct UTM *utm ) | |
84 | { | |
85 | if ( mode == VIK_COORD_UTM ) | |
86 | *((struct UTM *)coord) = *utm; | |
87 | else | |
88 | a_coords_utm_to_latlon ( utm, (struct LatLon *) coord ); | |
89 | coord->mode = mode; | |
90 | } | |
91 | ||
92 | void vik_coord_to_latlon ( const VikCoord *coord, struct LatLon *dest ) | |
93 | { | |
94 | if ( coord->mode == VIK_COORD_LATLON ) | |
95 | *dest = *((const struct LatLon *)coord); | |
96 | else | |
97 | a_coords_utm_to_latlon ( (const struct UTM *) coord, dest ); | |
98 | } | |
99 | ||
100 | void vik_coord_to_utm ( const VikCoord *coord, struct UTM *dest ) | |
101 | { | |
102 | if ( coord->mode == VIK_COORD_UTM ) | |
103 | *dest = *((const struct UTM *)coord); | |
104 | else | |
105 | a_coords_latlon_to_utm ( (const struct LatLon *) coord, dest ); | |
106 | } | |
107 | ||
108 | gboolean vik_coord_equals ( const VikCoord *coord1, const VikCoord *coord2 ) | |
109 | { | |
110 | if ( coord1->mode != coord2->mode ) | |
111 | return FALSE; | |
112 | if ( coord1->mode == VIK_COORD_LATLON ) | |
113 | return coord1->north_south == coord2->north_south && coord1->east_west == coord2->east_west; | |
114 | else /* VIK_COORD_UTM */ | |
115 | return coord1->utm_zone == coord2->utm_zone && coord1->north_south == coord2->north_south && coord1->east_west == coord2->east_west; | |
116 | } | |
7114e879 QT |
117 | |
118 | static void get_north_west(struct LatLon *center, struct LatLon *dist, struct LatLon *nw) | |
119 | { | |
120 | nw->lat = center->lat + dist->lat; | |
121 | nw->lon = center->lon - dist->lon; | |
122 | if (nw->lon < -180) | |
123 | nw->lon += 360.0; | |
124 | if (nw->lat > 90.0) { /* over north pole */ | |
125 | nw->lat = 180 - nw->lat; | |
126 | nw->lon = nw->lon - 180; | |
127 | } | |
128 | } | |
129 | ||
130 | static void get_south_east(struct LatLon *center, struct LatLon *dist, struct LatLon *se) | |
131 | { | |
132 | se->lat = center->lat - dist->lat; | |
133 | se->lon = center->lon + dist->lon; | |
134 | if (se->lon > 180.0) | |
135 | se->lon -= 360.0; | |
136 | if (se->lat < -90.0) { /* over south pole */ | |
137 | se->lat += 180; | |
138 | se->lon = se->lon - 180; | |
139 | } | |
140 | } | |
141 | ||
142 | void vik_coord_set_area(const VikCoord *coord, const struct LatLon *wh, VikCoord *tl, VikCoord *br) | |
143 | { | |
144 | struct LatLon center, nw, se; | |
145 | struct LatLon dist; | |
146 | ||
147 | dist.lat = wh->lat/2; | |
148 | dist.lon = wh->lon/2; | |
149 | ||
150 | vik_coord_to_latlon(coord, ¢er); | |
151 | get_north_west(¢er, &dist, &nw); | |
152 | get_south_east(¢er, &dist, &se); | |
153 | ||
7114e879 QT |
154 | *((struct LatLon *)tl) = nw; |
155 | *((struct LatLon *)br) = se; | |
35e22ed8 | 156 | tl->mode = br->mode = VIK_COORD_LATLON; |
7114e879 QT |
157 | } |
158 | ||
159 | gboolean vik_coord_inside(const VikCoord *coord, const VikCoord *tl, const VikCoord *br) | |
160 | { | |
161 | struct LatLon ll, tl_ll, br_ll; | |
162 | ||
163 | vik_coord_to_latlon(coord, &ll); | |
164 | vik_coord_to_latlon(tl, &tl_ll); | |
165 | vik_coord_to_latlon(br, &br_ll); | |
166 | ||
7114e879 QT |
167 | if ((ll.lat > tl_ll.lat) || (ll.lon < tl_ll.lon)) |
168 | return FALSE; | |
169 | if ((ll.lat < br_ll.lat) || (ll.lon > br_ll.lon)) | |
170 | return FALSE; | |
171 | return TRUE; | |
172 | } |