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032154e2 RN |
1 | /* |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2008, 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 | */ | |
ad0a8c2d EB |
21 | #include <glib.h> |
22 | ||
23 | #include "dems.h" | |
24 | ||
25 | typedef struct { | |
26 | VikDEM *dem; | |
27 | guint ref_count; | |
28 | } LoadedDEM; | |
29 | ||
30 | GHashTable *loaded_dems = NULL; | |
31 | /* filename -> DEM */ | |
32 | ||
33 | static void loaded_dem_free ( LoadedDEM *ldem ) | |
34 | { | |
35 | vik_dem_free ( ldem->dem ); | |
36 | g_free ( ldem ); | |
37 | } | |
38 | ||
39 | void a_dems_uninit () | |
40 | { | |
41 | if ( loaded_dems ) | |
42 | g_hash_table_destroy ( loaded_dems ); | |
43 | } | |
44 | ||
45 | /* To load a dem. if it was already loaded, will simply | |
46 | * reference the one already loaded and return it. | |
47 | */ | |
48 | VikDEM *a_dems_load(const gchar *filename) | |
49 | { | |
50 | LoadedDEM *ldem; | |
51 | ||
52 | /* dems init hash table */ | |
53 | if ( ! loaded_dems ) | |
54 | loaded_dems = g_hash_table_new_full ( g_str_hash, g_str_equal, g_free, (GDestroyNotify) loaded_dem_free ); | |
55 | ||
56 | ldem = (LoadedDEM *) g_hash_table_lookup ( loaded_dems, filename ); | |
57 | if ( ldem ) { | |
58 | ldem->ref_count++; | |
59 | return ldem->dem; | |
60 | } else { | |
61 | VikDEM *dem = vik_dem_new_from_file ( filename ); | |
62 | if ( ! dem ) | |
63 | return NULL; | |
64 | ldem = g_malloc ( sizeof(LoadedDEM) ); | |
65 | ldem->ref_count = 1; | |
66 | ldem->dem = dem; | |
67 | g_hash_table_insert ( loaded_dems, g_strdup(filename), ldem ); | |
68 | return dem; | |
69 | } | |
70 | } | |
71 | ||
72 | void a_dems_unref(const gchar *filename) | |
73 | { | |
74 | LoadedDEM *ldem = (LoadedDEM *) g_hash_table_lookup ( loaded_dems, filename ); | |
75 | g_assert ( ldem ); | |
76 | ldem->ref_count --; | |
77 | if ( ldem->ref_count == 0 ) | |
78 | g_hash_table_remove ( loaded_dems, filename ); | |
79 | } | |
80 | ||
81 | /* to get a DEM that was already loaded. | |
82 | * assumes that its in there already, | |
83 | * although it could not be if earlier load failed. | |
84 | */ | |
85 | VikDEM *a_dems_get(const gchar *filename) | |
86 | { | |
87 | LoadedDEM *ldem = g_hash_table_lookup ( loaded_dems, filename ); | |
88 | if ( ldem ) | |
89 | return ldem->dem; | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | ||
94 | /* Load a string list (GList of strings) of dems. You have to use get to at them later. | |
95 | * When updating a list as a parameter, this should be bfore freeing the list so | |
96 | * the same DEMs won't be loaded & unloaded. | |
97 | * Modifies the list to remove DEMs which did not load. | |
98 | */ | |
99 | ||
100 | /* TODO: don't delete them when they don't exist. | |
101 | * we need to warn the user, but we should keep them in the GList. | |
102 | * we need to know that they weren't referenced though when we | |
103 | * do the a_dems_list_free(). | |
104 | */ | |
105 | void a_dems_load_list ( GList **dems ) | |
106 | { | |
107 | GList *iter = *dems; | |
108 | while ( iter ) { | |
109 | if ( ! a_dems_load((const gchar *) (iter->data)) ) { | |
110 | GList *iter_temp = iter->next; | |
111 | g_free ( iter->data ); | |
112 | (*dems) = g_list_remove_link ( (*dems), iter ); | |
113 | iter = iter_temp; | |
114 | } else { | |
115 | iter = iter->next; | |
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | /* Takes a string list (GList of strings) of dems (filenames). | |
121 | * Unrefs all the dems (i.e. "unloads" them), then frees the | |
122 | * strings, the frees the list. | |
123 | */ | |
124 | void a_dems_list_free ( GList *dems ) | |
125 | { | |
126 | GList *iter = dems; | |
127 | while ( iter ) { | |
128 | a_dems_unref ((const gchar *)iter->data); | |
129 | g_free ( iter->data ); | |
130 | iter = iter->next; | |
131 | } | |
132 | g_list_free ( dems ); | |
133 | } | |
134 | ||
135 | GList *a_dems_list_copy ( GList *dems ) | |
136 | { | |
137 | GList *rv = g_list_copy ( dems ); | |
138 | GList *iter = rv; | |
139 | while ( iter ) { | |
140 | if ( ! a_dems_load((const gchar *) (iter->data)) ) { | |
141 | GList *iter_temp = iter->next; /* delete link, don't bother strdup'ing and free'ing string */ | |
142 | rv = g_list_remove_link ( rv, iter ); | |
143 | iter = iter_temp; | |
144 | } else { | |
145 | iter->data = g_strdup((gchar *)iter->data); /* copy the string too. */ | |
146 | iter = iter->next; | |
147 | } | |
148 | } | |
149 | return rv; | |
150 | } | |
151 | ||
152 | gint16 a_dems_list_get_elev_by_coord ( GList *dems, const VikCoord *coord ) | |
153 | { | |
154 | static struct UTM utm_tmp; | |
155 | static struct LatLon ll_tmp; | |
156 | GList *iter = dems; | |
157 | VikDEM *dem; | |
158 | gint elev; | |
159 | ||
160 | while ( iter ) { | |
161 | dem = a_dems_get ( (gchar *) iter->data ); | |
162 | if ( dem ) { | |
163 | if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) { | |
164 | vik_coord_to_latlon ( coord, &ll_tmp ); | |
165 | ll_tmp.lat *= 3600; | |
166 | ll_tmp.lon *= 3600; | |
167 | elev = vik_dem_get_east_north(dem, ll_tmp.lon, ll_tmp.lat); | |
168 | if ( elev != VIK_DEM_INVALID_ELEVATION ) | |
169 | return elev; | |
170 | } else if ( dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS ) { | |
171 | vik_coord_to_utm ( coord, &utm_tmp ); | |
172 | if ( utm_tmp.zone == dem->utm_zone && | |
173 | (elev = vik_dem_get_east_north(dem, utm_tmp.easting, utm_tmp.northing)) != VIK_DEM_INVALID_ELEVATION ) | |
174 | return elev; | |
175 | } | |
176 | } | |
177 | iter = iter->next; | |
178 | } | |
179 | return VIK_DEM_INVALID_ELEVATION; | |
180 | } | |
55906514 QT |
181 | |
182 | typedef struct { | |
183 | const VikCoord *coord; | |
5ef1d57e | 184 | VikDemInterpol method; |
55906514 QT |
185 | gint elev; |
186 | } CoordElev; | |
187 | ||
188 | static gboolean get_elev_by_coord(gpointer key, LoadedDEM *ldem, CoordElev *ce) | |
189 | { | |
190 | VikDEM *dem = ldem->dem; | |
5ef1d57e | 191 | gdouble lat, lon; |
55906514 QT |
192 | |
193 | if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) { | |
194 | struct LatLon ll_tmp; | |
195 | vik_coord_to_latlon (ce->coord, &ll_tmp ); | |
5ef1d57e QT |
196 | lat = ll_tmp.lat * 3600; |
197 | lon = ll_tmp.lon * 3600; | |
55906514 QT |
198 | } else if (dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS) { |
199 | static struct UTM utm_tmp; | |
5ef1d57e QT |
200 | if (utm_tmp.zone != dem->utm_zone) |
201 | return FALSE; | |
55906514 | 202 | vik_coord_to_utm (ce->coord, &utm_tmp); |
5ef1d57e QT |
203 | lat = utm_tmp.northing; |
204 | lon = utm_tmp.easting; | |
205 | } else | |
206 | return FALSE; | |
207 | ||
208 | switch (ce->method) { | |
209 | case VIK_DEM_INTERPOL_NONE: | |
210 | ce->elev = vik_dem_get_east_north(dem, lon, lat); | |
211 | break; | |
212 | case VIK_DEM_INTERPOL_SIMPLE: | |
213 | ce->elev = vik_dem_get_simple_interpol(dem, lon, lat); | |
214 | break; | |
215 | case VIK_DEM_INTERPOL_BEST: | |
216 | ce->elev = vik_dem_get_shepard_interpol(dem, lon, lat); | |
217 | break; | |
55906514 | 218 | } |
5ef1d57e | 219 | return (ce->elev != VIK_DEM_INVALID_ELEVATION); |
55906514 QT |
220 | } |
221 | ||
222 | /* TODO: keep a (sorted) linked list of DEMs and select the best resolution one */ | |
5ef1d57e | 223 | gint16 a_dems_get_elev_by_coord ( const VikCoord *coord, VikDemInterpol method ) |
55906514 QT |
224 | { |
225 | CoordElev ce; | |
226 | ||
227 | if (!loaded_dems) | |
228 | return VIK_DEM_INVALID_ELEVATION; | |
229 | ||
230 | ce.coord = coord; | |
5ef1d57e | 231 | ce.method = method; |
55906514 QT |
232 | ce.elev = VIK_DEM_INVALID_ELEVATION; |
233 | ||
0654760a | 234 | if(!g_hash_table_find(loaded_dems, (GHRFunc)get_elev_by_coord, &ce)) |
55906514 QT |
235 | return VIK_DEM_INVALID_ELEVATION; |
236 | return ce.elev; | |
237 | } |