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1 | /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */ |
2 | /* | |
3 | * viking | |
4 | * Copyright (C) 2010, Guilhem Bonnefille <guilhem.bonnefille@gmail.com> | |
5 | * | |
6 | * viking is free software: you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * viking is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
14 | * See the GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
aa69d106 GB |
19 | |
20 | /** | |
21 | * SECTION:viktmsmapsource | |
22 | * @short_description: the class for TMS oriented map sources | |
23 | * | |
24 | * The #VikTmsMapSource class handles TMS oriented map sources. | |
25 | * | |
26 | * The tiles are in 'equirectangular'. | |
27 | * http://en.wikipedia.org/wiki/Equirectangular_projection | |
28 | * | |
29 | * Such service is also a type of TMS (Tile Map Service) as defined in | |
30 | * OSGeo's wiki. | |
31 | * http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification | |
32 | * Following this specification, the protocol handled by this class | |
33 | * follows the global-geodetic profile. | |
34 | */ | |
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35 | |
36 | #ifdef HAVE_CONFIG_H | |
37 | #include "config.h" | |
38 | #endif | |
39 | ||
40 | #ifdef HAVE_MATH_H | |
41 | #include <math.h> | |
42 | #endif | |
43 | ||
44 | #include "globals.h" | |
45 | #include "viktmsmapsource.h" | |
46 | ||
47 | static gboolean _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ); | |
48 | static void _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest ); | |
49 | static gboolean _supports_download_only_new (VikMapSource *self ); | |
50 | ||
51 | static gchar *_get_uri( VikMapSourceDefault *self, MapCoord *src ); | |
52 | static gchar *_get_hostname( VikMapSourceDefault *self ); | |
53 | static DownloadMapOptions *_get_download_options( VikMapSourceDefault *self ); | |
54 | ||
55 | typedef struct _VikTmsMapSourcePrivate VikTmsMapSourcePrivate; | |
56 | struct _VikTmsMapSourcePrivate | |
57 | { | |
58 | gchar *hostname; | |
59 | gchar *url; | |
60 | DownloadMapOptions options; | |
61 | }; | |
62 | ||
63 | #define VIK_TMS_MAP_SOURCE_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_TMS_MAP_SOURCE, VikTmsMapSourcePrivate)) | |
64 | ||
65 | /* properties */ | |
66 | enum | |
67 | { | |
68 | PROP_0, | |
69 | ||
70 | PROP_HOSTNAME, | |
71 | PROP_URL, | |
72 | PROP_REFERER, | |
73 | PROP_FOLLOW_LOCATION, | |
74 | PROP_CHECK_FILE_SERVER_TIME, | |
75 | }; | |
76 | ||
77 | G_DEFINE_TYPE (VikTmsMapSource, vik_tms_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT); | |
78 | ||
79 | static void | |
80 | vik_tms_map_source_init (VikTmsMapSource *self) | |
81 | { | |
82 | /* initialize the object here */ | |
83 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self); | |
84 | ||
85 | priv->hostname = NULL; | |
86 | priv->url = NULL; | |
87 | priv->options.referer = NULL; | |
88 | priv->options.follow_location = 0; | |
89 | priv->options.check_file = a_check_map_file; | |
90 | priv->options.check_file_server_time = FALSE; | |
91 | ||
92 | g_object_set (G_OBJECT (self), | |
93 | "tilesize-x", 256, | |
94 | "tilesize-y", 256, | |
95 | "drawmode", VIK_VIEWPORT_DRAWMODE_LATLON, | |
96 | NULL); | |
97 | } | |
98 | ||
99 | static void | |
100 | vik_tms_map_source_finalize (GObject *object) | |
101 | { | |
102 | VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object); | |
103 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self); | |
104 | ||
105 | g_free (priv->hostname); | |
106 | priv->hostname = NULL; | |
107 | g_free (priv->url); | |
108 | priv->url = NULL; | |
109 | g_free (priv->options.referer); | |
110 | priv->options.referer = NULL; | |
111 | ||
112 | G_OBJECT_CLASS (vik_tms_map_source_parent_class)->finalize (object); | |
113 | } | |
114 | ||
115 | static void | |
116 | vik_tms_map_source_set_property (GObject *object, | |
117 | guint property_id, | |
118 | const GValue *value, | |
119 | GParamSpec *pspec) | |
120 | { | |
121 | VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object); | |
122 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self); | |
123 | ||
124 | switch (property_id) | |
125 | { | |
126 | case PROP_HOSTNAME: | |
127 | g_free (priv->hostname); | |
128 | priv->hostname = g_value_dup_string (value); | |
129 | break; | |
130 | ||
131 | case PROP_URL: | |
132 | g_free (priv->url); | |
133 | priv->url = g_value_dup_string (value); | |
134 | break; | |
135 | ||
136 | case PROP_REFERER: | |
137 | g_free (priv->options.referer); | |
138 | priv->options.referer = g_value_dup_string (value); | |
139 | break; | |
140 | ||
141 | case PROP_FOLLOW_LOCATION: | |
142 | priv->options.follow_location = g_value_get_long (value); | |
143 | break; | |
144 | ||
145 | case PROP_CHECK_FILE_SERVER_TIME: | |
146 | priv->options.check_file_server_time = g_value_get_boolean (value); | |
147 | break; | |
148 | ||
149 | default: | |
150 | /* We don't have any other property... */ | |
151 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); | |
152 | break; | |
153 | } | |
154 | } | |
155 | ||
156 | static void | |
157 | vik_tms_map_source_get_property (GObject *object, | |
158 | guint property_id, | |
159 | GValue *value, | |
160 | GParamSpec *pspec) | |
161 | { | |
162 | VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object); | |
163 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self); | |
164 | ||
165 | switch (property_id) | |
166 | { | |
167 | case PROP_HOSTNAME: | |
168 | g_value_set_string (value, priv->hostname); | |
169 | break; | |
170 | ||
171 | case PROP_URL: | |
172 | g_value_set_string (value, priv->url); | |
173 | break; | |
174 | ||
175 | case PROP_REFERER: | |
176 | g_value_set_string (value, priv->options.referer); | |
177 | break; | |
178 | ||
179 | case PROP_FOLLOW_LOCATION: | |
180 | g_value_set_long (value, priv->options.follow_location); | |
181 | break; | |
182 | ||
183 | case PROP_CHECK_FILE_SERVER_TIME: | |
184 | g_value_set_boolean (value, priv->options.check_file_server_time); | |
185 | break; | |
186 | ||
187 | default: | |
188 | /* We don't have any other property... */ | |
189 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); | |
190 | break; | |
191 | } | |
192 | } | |
193 | ||
194 | static void | |
195 | vik_tms_map_source_class_init (VikTmsMapSourceClass *klass) | |
196 | { | |
197 | GObjectClass* object_class = G_OBJECT_CLASS (klass); | |
a3319e11 | 198 | VikMapSourceClass* grandparent_class = VIK_MAP_SOURCE_CLASS (klass); |
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199 | VikMapSourceDefaultClass* parent_class = VIK_MAP_SOURCE_DEFAULT_CLASS (klass); |
200 | GParamSpec *pspec = NULL; | |
201 | ||
202 | object_class->set_property = vik_tms_map_source_set_property; | |
203 | object_class->get_property = vik_tms_map_source_get_property; | |
204 | ||
205 | /* Overiding methods */ | |
a3319e11 RN |
206 | grandparent_class->coord_to_mapcoord = _coord_to_mapcoord; |
207 | grandparent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord; | |
208 | grandparent_class->supports_download_only_new = _supports_download_only_new; | |
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209 | |
210 | parent_class->get_uri = _get_uri; | |
211 | parent_class->get_hostname = _get_hostname; | |
212 | parent_class->get_download_options = _get_download_options; | |
213 | ||
214 | pspec = g_param_spec_string ("hostname", | |
215 | "Hostname", | |
216 | "The hostname of the map server", | |
217 | "<no-set>" /* default value */, | |
218 | G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE); | |
219 | g_object_class_install_property (object_class, PROP_HOSTNAME, pspec); | |
220 | ||
221 | pspec = g_param_spec_string ("url", | |
222 | "URL", | |
223 | "The template of the tiles' URL", | |
224 | "<no-set>" /* default value */, | |
225 | G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE); | |
226 | g_object_class_install_property (object_class, PROP_URL, pspec); | |
227 | ||
228 | pspec = g_param_spec_string ("referer", | |
229 | "Referer", | |
230 | "The REFERER string to use in HTTP request", | |
231 | NULL /* default value */, | |
232 | G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE); | |
233 | g_object_class_install_property (object_class, PROP_REFERER, pspec); | |
234 | ||
235 | pspec = g_param_spec_long ("follow-location", | |
236 | "Follow location", | |
237 | "Specifies the number of retries to follow a redirect while downloading a page", | |
238 | 0 /* minimum value */, | |
239 | G_MAXLONG /* maximum value */, | |
240 | 0 /* default value */, | |
241 | G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE); | |
242 | g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec); | |
243 | ||
244 | pspec = g_param_spec_boolean ("check-file-server-time", | |
245 | "Check file server time", | |
246 | "Age of current cache before redownloading tile", | |
247 | FALSE /* default value */, | |
248 | G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE); | |
249 | g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, pspec); | |
250 | ||
251 | g_type_class_add_private (klass, sizeof (VikTmsMapSourcePrivate)); | |
252 | ||
253 | object_class->finalize = vik_tms_map_source_finalize; | |
254 | } | |
255 | ||
256 | /* 1 << (x) is like a 2**(x) */ | |
257 | #define GZ(x) ((1<<(x))) | |
258 | ||
259 | static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9), | |
260 | GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) }; | |
261 | ||
262 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])); | |
263 | ||
264 | static const gdouble scale_neg_mpps[] = { 1.0/GZ(0), 1.0/GZ(1), 1.0/GZ(2), 1.0/GZ(3) }; | |
265 | static const gint num_scales_neg = (sizeof(scale_neg_mpps) / sizeof(scale_neg_mpps[0])); | |
266 | ||
267 | #define ERROR_MARGIN 0.01 | |
268 | static gint tms_zoom ( gdouble mpp ) { | |
269 | gint i; | |
270 | for ( i = 0; i < num_scales; i++ ) { | |
271 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) { | |
272 | return i; | |
273 | } | |
274 | } | |
275 | for ( i = 0; i < num_scales_neg; i++ ) { | |
276 | if ( ABS(scale_neg_mpps[i] - mpp) < 0.000001 ) { | |
277 | return -i; | |
278 | } | |
279 | } | |
280 | ||
281 | return 255; | |
282 | } | |
283 | ||
284 | gboolean | |
285 | _supports_download_only_new (VikMapSource *self) | |
286 | { | |
287 | g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), FALSE); | |
288 | ||
289 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self); | |
290 | ||
291 | return priv->options.check_file_server_time; | |
292 | } | |
293 | ||
294 | static gboolean | |
295 | _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
296 | { | |
297 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
298 | ||
299 | if ( xzoom != yzoom ) | |
300 | return FALSE; | |
301 | ||
302 | dest->scale = tms_zoom ( xzoom ); | |
303 | if ( dest->scale == 255 ) | |
304 | return FALSE; | |
305 | ||
306 | /* Note : GZ(17) / xzoom / 2 = number of tile on Y axis */ | |
307 | g_debug("%s: xzoom=%f yzoom=%f -> %f", __FUNCTION__, | |
308 | xzoom, yzoom, GZ(17) / xzoom / 2); | |
309 | dest->x = floor((src->east_west + 180) / 180 * GZ(17) / xzoom / 2); | |
310 | /* We should restore logic of viking: | |
311 | * tile index on Y axis follow a screen logic (top -> down) | |
312 | */ | |
313 | dest->y = floor((180 - (src->north_south + 90)) / 180 * GZ(17) / xzoom / 2); | |
314 | dest->z = 0; | |
315 | g_debug("%s: %f,%f -> %d,%d", __FUNCTION__, | |
316 | src->east_west, src->north_south, dest->x, dest->y); | |
317 | return TRUE; | |
318 | } | |
319 | ||
320 | static void | |
321 | _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest ) | |
322 | { | |
323 | gdouble socalled_mpp; | |
324 | if (src->scale >= 0) | |
325 | socalled_mpp = GZ(src->scale); | |
326 | else | |
327 | socalled_mpp = 1.0/GZ(-src->scale); | |
328 | dest->mode = VIK_COORD_LATLON; | |
329 | dest->east_west = (src->x+0.5) * 180 / GZ(17) * socalled_mpp * 2 - 180; | |
330 | /* We should restore logic of viking: | |
331 | * tile index on Y axis follow a screen logic (top -> down) | |
332 | */ | |
333 | dest->north_south = -((src->y+0.5) * 180 / GZ(17) * socalled_mpp * 2 - 90); | |
334 | g_debug("%s: %d,%d -> %f,%f", __FUNCTION__, | |
335 | src->x, src->y, dest->east_west, dest->north_south); | |
336 | } | |
337 | ||
338 | static gchar * | |
339 | _get_uri( VikMapSourceDefault *self, MapCoord *src ) | |
340 | { | |
341 | g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL); | |
342 | ||
343 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self); | |
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344 | /* We should restore logic of viking: |
345 | * tile index on Y axis follow a screen logic (top -> down) | |
346 | */ | |
347 | ||
348 | /* Note : nb tiles on Y axis */ | |
349 | gint nb_tiles = GZ(17 - src->scale - 1); | |
350 | ||
351 | gchar *uri = g_strdup_printf (priv->url, 17 - src->scale - 1, src->x, nb_tiles - src->y - 1); | |
352 | ||
353 | return uri; | |
354 | } | |
355 | ||
356 | static gchar * | |
357 | _get_hostname( VikMapSourceDefault *self ) | |
358 | { | |
359 | g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL); | |
360 | ||
361 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self); | |
362 | return g_strdup( priv->hostname ); | |
363 | } | |
364 | ||
365 | static DownloadMapOptions * | |
366 | _get_download_options( VikMapSourceDefault *self ) | |
367 | { | |
368 | g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL); | |
369 | ||
370 | VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self); | |
371 | return &(priv->options); | |
372 | } | |
373 | ||
374 | VikTmsMapSource * | |
375 | vik_tms_map_source_new_with_id (guint8 id, const gchar *label, const gchar *hostname, const gchar *url) | |
376 | { | |
377 | return g_object_new(VIK_TYPE_TMS_MAP_SOURCE, | |
378 | "id", id, "label", label, "hostname", hostname, "url", url, NULL); | |
379 | } |