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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> | |
a482007a | 5 | * Copyright (C) 2007, Quy Tonthat <qtonthat@gmail.com> |
032154e2 RN |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
ad0a8c2d EB |
22 | #include <glib.h> |
23 | ||
24 | #include "dems.h" | |
25 | ||
26 | typedef struct { | |
27 | VikDEM *dem; | |
28 | guint ref_count; | |
29 | } LoadedDEM; | |
30 | ||
31 | GHashTable *loaded_dems = NULL; | |
32 | /* filename -> DEM */ | |
33 | ||
34 | static void loaded_dem_free ( LoadedDEM *ldem ) | |
35 | { | |
36 | vik_dem_free ( ldem->dem ); | |
37 | g_free ( ldem ); | |
38 | } | |
39 | ||
40 | void a_dems_uninit () | |
41 | { | |
42 | if ( loaded_dems ) | |
43 | g_hash_table_destroy ( loaded_dems ); | |
44 | } | |
45 | ||
46 | /* To load a dem. if it was already loaded, will simply | |
47 | * reference the one already loaded and return it. | |
48 | */ | |
49 | VikDEM *a_dems_load(const gchar *filename) | |
50 | { | |
51 | LoadedDEM *ldem; | |
52 | ||
53 | /* dems init hash table */ | |
54 | if ( ! loaded_dems ) | |
55 | loaded_dems = g_hash_table_new_full ( g_str_hash, g_str_equal, g_free, (GDestroyNotify) loaded_dem_free ); | |
56 | ||
57 | ldem = (LoadedDEM *) g_hash_table_lookup ( loaded_dems, filename ); | |
58 | if ( ldem ) { | |
59 | ldem->ref_count++; | |
60 | return ldem->dem; | |
61 | } else { | |
62 | VikDEM *dem = vik_dem_new_from_file ( filename ); | |
63 | if ( ! dem ) | |
64 | return NULL; | |
65 | ldem = g_malloc ( sizeof(LoadedDEM) ); | |
66 | ldem->ref_count = 1; | |
67 | ldem->dem = dem; | |
68 | g_hash_table_insert ( loaded_dems, g_strdup(filename), ldem ); | |
69 | return dem; | |
70 | } | |
71 | } | |
72 | ||
73 | void a_dems_unref(const gchar *filename) | |
74 | { | |
75 | LoadedDEM *ldem = (LoadedDEM *) g_hash_table_lookup ( loaded_dems, filename ); | |
76 | g_assert ( ldem ); | |
77 | ldem->ref_count --; | |
78 | if ( ldem->ref_count == 0 ) | |
79 | g_hash_table_remove ( loaded_dems, filename ); | |
80 | } | |
81 | ||
82 | /* to get a DEM that was already loaded. | |
83 | * assumes that its in there already, | |
84 | * although it could not be if earlier load failed. | |
85 | */ | |
86 | VikDEM *a_dems_get(const gchar *filename) | |
87 | { | |
88 | LoadedDEM *ldem = g_hash_table_lookup ( loaded_dems, filename ); | |
89 | if ( ldem ) | |
90 | return ldem->dem; | |
91 | return NULL; | |
92 | } | |
93 | ||
94 | ||
95 | /* Load a string list (GList of strings) of dems. You have to use get to at them later. | |
96 | * When updating a list as a parameter, this should be bfore freeing the list so | |
97 | * the same DEMs won't be loaded & unloaded. | |
98 | * Modifies the list to remove DEMs which did not load. | |
99 | */ | |
100 | ||
101 | /* TODO: don't delete them when they don't exist. | |
102 | * we need to warn the user, but we should keep them in the GList. | |
103 | * we need to know that they weren't referenced though when we | |
104 | * do the a_dems_list_free(). | |
105 | */ | |
106 | void a_dems_load_list ( GList **dems ) | |
107 | { | |
108 | GList *iter = *dems; | |
109 | while ( iter ) { | |
110 | if ( ! a_dems_load((const gchar *) (iter->data)) ) { | |
111 | GList *iter_temp = iter->next; | |
112 | g_free ( iter->data ); | |
113 | (*dems) = g_list_remove_link ( (*dems), iter ); | |
114 | iter = iter_temp; | |
115 | } else { | |
116 | iter = iter->next; | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | /* Takes a string list (GList of strings) of dems (filenames). | |
122 | * Unrefs all the dems (i.e. "unloads" them), then frees the | |
123 | * strings, the frees the list. | |
124 | */ | |
125 | void a_dems_list_free ( GList *dems ) | |
126 | { | |
127 | GList *iter = dems; | |
128 | while ( iter ) { | |
129 | a_dems_unref ((const gchar *)iter->data); | |
130 | g_free ( iter->data ); | |
131 | iter = iter->next; | |
132 | } | |
133 | g_list_free ( dems ); | |
134 | } | |
135 | ||
136 | GList *a_dems_list_copy ( GList *dems ) | |
137 | { | |
138 | GList *rv = g_list_copy ( dems ); | |
139 | GList *iter = rv; | |
140 | while ( iter ) { | |
141 | if ( ! a_dems_load((const gchar *) (iter->data)) ) { | |
142 | GList *iter_temp = iter->next; /* delete link, don't bother strdup'ing and free'ing string */ | |
143 | rv = g_list_remove_link ( rv, iter ); | |
144 | iter = iter_temp; | |
145 | } else { | |
146 | iter->data = g_strdup((gchar *)iter->data); /* copy the string too. */ | |
147 | iter = iter->next; | |
148 | } | |
149 | } | |
150 | return rv; | |
151 | } | |
152 | ||
153 | gint16 a_dems_list_get_elev_by_coord ( GList *dems, const VikCoord *coord ) | |
154 | { | |
155 | static struct UTM utm_tmp; | |
156 | static struct LatLon ll_tmp; | |
157 | GList *iter = dems; | |
158 | VikDEM *dem; | |
159 | gint elev; | |
160 | ||
161 | while ( iter ) { | |
162 | dem = a_dems_get ( (gchar *) iter->data ); | |
163 | if ( dem ) { | |
164 | if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) { | |
165 | vik_coord_to_latlon ( coord, &ll_tmp ); | |
166 | ll_tmp.lat *= 3600; | |
167 | ll_tmp.lon *= 3600; | |
168 | elev = vik_dem_get_east_north(dem, ll_tmp.lon, ll_tmp.lat); | |
169 | if ( elev != VIK_DEM_INVALID_ELEVATION ) | |
170 | return elev; | |
171 | } else if ( dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS ) { | |
172 | vik_coord_to_utm ( coord, &utm_tmp ); | |
173 | if ( utm_tmp.zone == dem->utm_zone && | |
174 | (elev = vik_dem_get_east_north(dem, utm_tmp.easting, utm_tmp.northing)) != VIK_DEM_INVALID_ELEVATION ) | |
175 | return elev; | |
176 | } | |
177 | } | |
178 | iter = iter->next; | |
179 | } | |
180 | return VIK_DEM_INVALID_ELEVATION; | |
181 | } | |
55906514 QT |
182 | |
183 | typedef struct { | |
184 | const VikCoord *coord; | |
5ef1d57e | 185 | VikDemInterpol method; |
55906514 QT |
186 | gint elev; |
187 | } CoordElev; | |
188 | ||
189 | static gboolean get_elev_by_coord(gpointer key, LoadedDEM *ldem, CoordElev *ce) | |
190 | { | |
191 | VikDEM *dem = ldem->dem; | |
5ef1d57e | 192 | gdouble lat, lon; |
55906514 QT |
193 | |
194 | if ( dem->horiz_units == VIK_DEM_HORIZ_LL_ARCSECONDS ) { | |
195 | struct LatLon ll_tmp; | |
196 | vik_coord_to_latlon (ce->coord, &ll_tmp ); | |
5ef1d57e QT |
197 | lat = ll_tmp.lat * 3600; |
198 | lon = ll_tmp.lon * 3600; | |
55906514 QT |
199 | } else if (dem->horiz_units == VIK_DEM_HORIZ_UTM_METERS) { |
200 | static struct UTM utm_tmp; | |
5ef1d57e QT |
201 | if (utm_tmp.zone != dem->utm_zone) |
202 | return FALSE; | |
55906514 | 203 | vik_coord_to_utm (ce->coord, &utm_tmp); |
5ef1d57e QT |
204 | lat = utm_tmp.northing; |
205 | lon = utm_tmp.easting; | |
206 | } else | |
207 | return FALSE; | |
208 | ||
209 | switch (ce->method) { | |
210 | case VIK_DEM_INTERPOL_NONE: | |
211 | ce->elev = vik_dem_get_east_north(dem, lon, lat); | |
212 | break; | |
213 | case VIK_DEM_INTERPOL_SIMPLE: | |
214 | ce->elev = vik_dem_get_simple_interpol(dem, lon, lat); | |
215 | break; | |
216 | case VIK_DEM_INTERPOL_BEST: | |
217 | ce->elev = vik_dem_get_shepard_interpol(dem, lon, lat); | |
218 | break; | |
55906514 | 219 | } |
5ef1d57e | 220 | return (ce->elev != VIK_DEM_INVALID_ELEVATION); |
55906514 QT |
221 | } |
222 | ||
223 | /* TODO: keep a (sorted) linked list of DEMs and select the best resolution one */ | |
5ef1d57e | 224 | gint16 a_dems_get_elev_by_coord ( const VikCoord *coord, VikDemInterpol method ) |
55906514 QT |
225 | { |
226 | CoordElev ce; | |
227 | ||
228 | if (!loaded_dems) | |
229 | return VIK_DEM_INVALID_ELEVATION; | |
230 | ||
231 | ce.coord = coord; | |
5ef1d57e | 232 | ce.method = method; |
55906514 QT |
233 | ce.elev = VIK_DEM_INVALID_ELEVATION; |
234 | ||
0654760a | 235 | if(!g_hash_table_find(loaded_dems, (GHRFunc)get_elev_by_coord, &ce)) |
55906514 QT |
236 | return VIK_DEM_INVALID_ELEVATION; |
237 | return ce.elev; | |
238 | } |