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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> | |
0d2b891f | 5 | * Copyright (c) 2012, Rob Norris <rw_norris@hotmail.com> |
50a14534 EB |
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 | */ | |
8c00358d GB |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
50a14534 EB |
25 | |
26 | #include <glib.h> | |
27 | #include <time.h> | |
bf35388d | 28 | #include <stdlib.h> |
8c00358d | 29 | #ifdef HAVE_STRING_H |
ddc47a46 | 30 | #include <string.h> |
8c00358d GB |
31 | #endif |
32 | #ifdef HAVE_MATH_H | |
bf35388d | 33 | #include <math.h> |
8c00358d GB |
34 | #endif |
35 | ||
50a14534 EB |
36 | #include "coords.h" |
37 | #include "vikcoord.h" | |
38 | #include "viktrack.h" | |
39 | #include "globals.h" | |
ad0a8c2d | 40 | #include "dems.h" |
387ff7ac | 41 | #include "settings.h" |
50a14534 EB |
42 | |
43 | VikTrack *vik_track_new() | |
44 | { | |
8c4f1350 | 45 | VikTrack *tr = g_malloc0 ( sizeof ( VikTrack ) ); |
50a14534 EB |
46 | tr->ref_count = 1; |
47 | return tr; | |
48 | } | |
49 | ||
387ff7ac RN |
50 | #define VIK_SETTINGS_TRACK_NAME_MODE "track_draw_name_mode" |
51 | #define VIK_SETTINGS_TRACK_NUM_DIST_LABELS "track_number_dist_labels" | |
52 | ||
53 | /** | |
54 | * vik_track_set_defaults: | |
55 | * | |
56 | * Set some default values for a track. | |
57 | * ATM This uses the 'settings' method to get values, | |
58 | * so there is no GUI way to control these yet... | |
59 | */ | |
60 | void vik_track_set_defaults(VikTrack *tr) | |
61 | { | |
62 | gint tmp; | |
63 | if ( a_settings_get_integer ( VIK_SETTINGS_TRACK_NAME_MODE, &tmp ) ) | |
64 | tr->draw_name_mode = tmp; | |
65 | ||
66 | if ( a_settings_get_integer ( VIK_SETTINGS_TRACK_NUM_DIST_LABELS, &tmp ) ) | |
67 | tr->max_number_dist_labels = tmp; | |
68 | } | |
69 | ||
50a14534 EB |
70 | void vik_track_set_comment_no_copy(VikTrack *tr, gchar *comment) |
71 | { | |
72 | if ( tr->comment ) | |
73 | g_free ( tr->comment ); | |
74 | tr->comment = comment; | |
75 | } | |
76 | ||
77 | ||
ce4bd1cf RN |
78 | void vik_track_set_name(VikTrack *tr, const gchar *name) |
79 | { | |
80 | if ( tr->name ) | |
81 | g_free ( tr->name ); | |
82 | ||
27d267f4 | 83 | tr->name = g_strdup(name); |
ce4bd1cf RN |
84 | } |
85 | ||
50a14534 EB |
86 | void vik_track_set_comment(VikTrack *tr, const gchar *comment) |
87 | { | |
88 | if ( tr->comment ) | |
89 | g_free ( tr->comment ); | |
90 | ||
91 | if ( comment && comment[0] != '\0' ) | |
92 | tr->comment = g_strdup(comment); | |
93 | else | |
94 | tr->comment = NULL; | |
95 | } | |
96 | ||
6b2f262e RN |
97 | void vik_track_set_description(VikTrack *tr, const gchar *description) |
98 | { | |
99 | if ( tr->description ) | |
100 | g_free ( tr->description ); | |
101 | ||
102 | if ( description && description[0] != '\0' ) | |
103 | tr->description = g_strdup(description); | |
104 | else | |
105 | tr->description = NULL; | |
106 | } | |
107 | ||
be455472 RN |
108 | void vik_track_set_source(VikTrack *tr, const gchar *source) |
109 | { | |
110 | if ( tr->source ) | |
111 | g_free ( tr->source ); | |
112 | ||
113 | if ( source && source[0] != '\0' ) | |
114 | tr->source = g_strdup(source); | |
115 | else | |
116 | tr->source = NULL; | |
117 | } | |
118 | ||
01cfda98 RN |
119 | void vik_track_set_type(VikTrack *tr, const gchar *type) |
120 | { | |
121 | if ( tr->type ) | |
122 | g_free ( tr->type ); | |
123 | ||
124 | if ( type && type[0] != '\0' ) | |
125 | tr->type = g_strdup(type); | |
126 | else | |
127 | tr->type = NULL; | |
128 | } | |
129 | ||
50a14534 EB |
130 | void vik_track_ref(VikTrack *tr) |
131 | { | |
132 | tr->ref_count++; | |
133 | } | |
134 | ||
21700912 QT |
135 | void vik_track_set_property_dialog(VikTrack *tr, GtkWidget *dialog) |
136 | { | |
137 | /* Warning: does not check for existing dialog */ | |
138 | tr->property_dialog = dialog; | |
139 | } | |
140 | ||
141 | void vik_track_clear_property_dialog(VikTrack *tr) | |
142 | { | |
143 | tr->property_dialog = NULL; | |
144 | } | |
145 | ||
50a14534 EB |
146 | void vik_track_free(VikTrack *tr) |
147 | { | |
148 | if ( tr->ref_count-- > 1 ) | |
149 | return; | |
150 | ||
ce4bd1cf RN |
151 | if ( tr->name ) |
152 | g_free ( tr->name ); | |
50a14534 EB |
153 | if ( tr->comment ) |
154 | g_free ( tr->comment ); | |
6b2f262e RN |
155 | if ( tr->description ) |
156 | g_free ( tr->description ); | |
be455472 RN |
157 | if ( tr->source ) |
158 | g_free ( tr->source ); | |
01cfda98 RN |
159 | if ( tr->type ) |
160 | g_free ( tr->type ); | |
f629b00b | 161 | g_list_foreach ( tr->trackpoints, (GFunc) vik_trackpoint_free, NULL ); |
50a14534 | 162 | g_list_free( tr->trackpoints ); |
21700912 | 163 | if (tr->property_dialog) |
63b31477 RN |
164 | if ( GTK_IS_WIDGET(tr->property_dialog) ) |
165 | gtk_widget_destroy ( GTK_WIDGET(tr->property_dialog) ); | |
50a14534 EB |
166 | g_free ( tr ); |
167 | } | |
168 | ||
03817fbf RN |
169 | /** |
170 | * vik_track_copy: | |
171 | * @tr: The Track to copy | |
172 | * @copy_points: Whether to copy the track points or not | |
173 | * | |
174 | * Normally for copying the track it's best to copy all the trackpoints | |
175 | * However for some operations such as splitting tracks the trackpoints will be managed separately, so no need to copy them. | |
176 | * | |
177 | * Returns: the copied VikTrack | |
178 | */ | |
179 | VikTrack *vik_track_copy ( const VikTrack *tr, gboolean copy_points ) | |
50a14534 EB |
180 | { |
181 | VikTrack *new_tr = vik_track_new(); | |
b45865b4 | 182 | new_tr->name = g_strdup(tr->name); |
50a14534 | 183 | new_tr->visible = tr->visible; |
0d2b891f | 184 | new_tr->is_route = tr->is_route; |
387ff7ac RN |
185 | new_tr->draw_name_mode = tr->draw_name_mode; |
186 | new_tr->max_number_dist_labels = tr->max_number_dist_labels; | |
b1453c16 RN |
187 | new_tr->has_color = tr->has_color; |
188 | new_tr->color = tr->color; | |
20981fd6 | 189 | new_tr->bbox = tr->bbox; |
50a14534 | 190 | new_tr->trackpoints = NULL; |
03817fbf | 191 | if ( copy_points ) |
50a14534 | 192 | { |
f629b00b | 193 | GList *tp_iter = tr->trackpoints; |
03817fbf RN |
194 | while ( tp_iter ) |
195 | { | |
f629b00b RN |
196 | VikTrackpoint *new_tp = vik_trackpoint_copy ( (VikTrackpoint*)(tp_iter->data) ); |
197 | new_tr->trackpoints = g_list_prepend ( new_tr->trackpoints, new_tp ); | |
03817fbf RN |
198 | tp_iter = tp_iter->next; |
199 | } | |
f629b00b RN |
200 | if ( new_tr->trackpoints ) |
201 | new_tr->trackpoints = g_list_reverse ( new_tr->trackpoints ); | |
50a14534 | 202 | } |
ce4bd1cf | 203 | vik_track_set_name(new_tr,tr->name); |
50a14534 | 204 | vik_track_set_comment(new_tr,tr->comment); |
6b2f262e | 205 | vik_track_set_description(new_tr,tr->description); |
be455472 | 206 | vik_track_set_source(new_tr,tr->source); |
50a14534 EB |
207 | return new_tr; |
208 | } | |
209 | ||
210 | VikTrackpoint *vik_trackpoint_new() | |
211 | { | |
a2817d3c | 212 | VikTrackpoint *tp = g_malloc0(sizeof(VikTrackpoint)); |
a2817d3c QT |
213 | tp->speed = NAN; |
214 | tp->course = NAN; | |
8541f2cf T |
215 | tp->altitude = VIK_DEFAULT_ALTITUDE; |
216 | tp->hdop = VIK_DEFAULT_DOP; | |
217 | tp->vdop = VIK_DEFAULT_DOP; | |
218 | tp->pdop = VIK_DEFAULT_DOP; | |
a2817d3c | 219 | return tp; |
50a14534 EB |
220 | } |
221 | ||
222 | void vik_trackpoint_free(VikTrackpoint *tp) | |
223 | { | |
b45865b4 | 224 | g_free(tp->name); |
50a14534 EB |
225 | g_free(tp); |
226 | } | |
227 | ||
b45865b4 RN |
228 | void vik_trackpoint_set_name(VikTrackpoint *tp, const gchar *name) |
229 | { | |
230 | if ( tp->name ) | |
231 | g_free ( tp->name ); | |
232 | ||
233 | // If the name is blank then completely remove it | |
234 | if ( name && name[0] == '\0' ) | |
235 | tp->name = NULL; | |
236 | else if ( name ) | |
237 | tp->name = g_strdup(name); | |
238 | else | |
239 | tp->name = NULL; | |
240 | } | |
241 | ||
50a14534 EB |
242 | VikTrackpoint *vik_trackpoint_copy(VikTrackpoint *tp) |
243 | { | |
f629b00b RN |
244 | VikTrackpoint *new_tp = vik_trackpoint_new(); |
245 | memcpy ( new_tp, tp, sizeof(VikTrackpoint) ); | |
246 | if ( tp->name ) | |
247 | new_tp->name = g_strdup (tp->name); | |
248 | return new_tp; | |
50a14534 EB |
249 | } |
250 | ||
9bc95d58 RN |
251 | /** |
252 | * track_recalculate_bounds_last_tp: | |
253 | * @trk: The track to consider the recalculation on | |
254 | * | |
255 | * A faster bounds check, since it only considers the last track point | |
256 | */ | |
257 | static void track_recalculate_bounds_last_tp ( VikTrack *trk ) | |
258 | { | |
259 | GList *tpl = g_list_last ( trk->trackpoints ); | |
260 | ||
261 | if ( tpl ) { | |
262 | struct LatLon ll; | |
263 | // See if this trackpoint increases the track bounds and update if so | |
264 | vik_coord_to_latlon ( &(VIK_TRACKPOINT(tpl->data)->coord), &ll ); | |
265 | if ( ll.lat > trk->bbox.north ) | |
266 | trk->bbox.north = ll.lat; | |
267 | if ( ll.lon < trk->bbox.west ) | |
268 | trk->bbox.west = ll.lon; | |
269 | if ( ll.lat < trk->bbox.south ) | |
270 | trk->bbox.south = ll.lat; | |
271 | if ( ll.lon > trk->bbox.east ) | |
272 | trk->bbox.east = ll.lon; | |
273 | } | |
274 | } | |
275 | ||
276 | /** | |
277 | * vik_track_add_trackpoint: | |
278 | * @tr: The track to which the trackpoint will be added | |
279 | * @tp: The trackpoint to add | |
280 | * @recalculate: Whether to perform any associated properties recalculations | |
281 | * Generally one should avoid recalculation via this method if adding lots of points | |
282 | * (But ensure calculate_bounds() is called after adding all points!!) | |
283 | * | |
284 | * The trackpoint is added to the end of the existing trackpoint list | |
285 | */ | |
286 | void vik_track_add_trackpoint ( VikTrack *tr, VikTrackpoint *tp, gboolean recalculate ) | |
287 | { | |
b6aef7c4 RN |
288 | // When it's the first trackpoint need to ensure the bounding box is initialized correctly |
289 | gboolean adding_first_point = tr->trackpoints ? FALSE : TRUE; | |
9bc95d58 | 290 | tr->trackpoints = g_list_append ( tr->trackpoints, tp ); |
b6aef7c4 RN |
291 | if ( adding_first_point ) |
292 | vik_track_calculate_bounds ( tr ); | |
293 | else if ( recalculate ) | |
9bc95d58 RN |
294 | track_recalculate_bounds_last_tp ( tr ); |
295 | } | |
296 | ||
db478c57 RN |
297 | /** |
298 | * vik_track_get_length_to_trackpoint: | |
299 | * | |
300 | */ | |
301 | gdouble vik_track_get_length_to_trackpoint (const VikTrack *tr, const VikTrackpoint *tp) | |
302 | { | |
303 | gdouble len = 0.0; | |
304 | if ( tr->trackpoints ) | |
305 | { | |
c707ab6a RN |
306 | // Is it the very first track point? |
307 | if ( VIK_TRACKPOINT(tr->trackpoints->data) == tp ) | |
308 | return len; | |
309 | ||
db478c57 RN |
310 | GList *iter = tr->trackpoints->next; |
311 | while (iter) | |
312 | { | |
313 | VikTrackpoint *tp1 = VIK_TRACKPOINT(iter->data); | |
314 | if ( ! tp1->newsegment ) | |
315 | len += vik_coord_diff ( &(tp1->coord), | |
316 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
317 | ||
318 | // Exit when we reach the desired point | |
319 | if ( tp1 == tp ) | |
c707ab6a | 320 | break; |
db478c57 RN |
321 | |
322 | iter = iter->next; | |
323 | } | |
324 | } | |
325 | return len; | |
326 | } | |
327 | ||
50a14534 EB |
328 | gdouble vik_track_get_length(const VikTrack *tr) |
329 | { | |
330 | gdouble len = 0.0; | |
331 | if ( tr->trackpoints ) | |
332 | { | |
333 | GList *iter = tr->trackpoints->next; | |
334 | while (iter) | |
335 | { | |
336 | if ( ! VIK_TRACKPOINT(iter->data)->newsegment ) | |
337 | len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
338 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
339 | iter = iter->next; | |
340 | } | |
341 | } | |
342 | return len; | |
343 | } | |
344 | ||
345 | gdouble vik_track_get_length_including_gaps(const VikTrack *tr) | |
346 | { | |
347 | gdouble len = 0.0; | |
348 | if ( tr->trackpoints ) | |
349 | { | |
350 | GList *iter = tr->trackpoints->next; | |
351 | while (iter) | |
352 | { | |
353 | len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
354 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
355 | iter = iter->next; | |
356 | } | |
357 | } | |
358 | return len; | |
359 | } | |
360 | ||
361 | gulong vik_track_get_tp_count(const VikTrack *tr) | |
362 | { | |
a619ecac | 363 | return g_list_length(tr->trackpoints); |
50a14534 EB |
364 | } |
365 | ||
366 | gulong vik_track_get_dup_point_count ( const VikTrack *tr ) | |
367 | { | |
368 | gulong num = 0; | |
369 | GList *iter = tr->trackpoints; | |
370 | while ( iter ) | |
371 | { | |
372 | if ( iter->next && vik_coord_equals ( &(VIK_TRACKPOINT(iter->data)->coord), | |
373 | &(VIK_TRACKPOINT(iter->next->data)->coord) ) ) | |
374 | num++; | |
375 | iter = iter->next; | |
376 | } | |
377 | return num; | |
378 | } | |
379 | ||
4f48c541 RN |
380 | /* |
381 | * Deletes adjacent points that have the same position | |
382 | * Returns the number of points that were deleted | |
383 | */ | |
384 | gulong vik_track_remove_dup_points ( VikTrack *tr ) | |
50a14534 | 385 | { |
4f48c541 | 386 | gulong num = 0; |
50a14534 EB |
387 | GList *iter = tr->trackpoints; |
388 | while ( iter ) | |
389 | { | |
390 | if ( iter->next && vik_coord_equals ( &(VIK_TRACKPOINT(iter->data)->coord), | |
391 | &(VIK_TRACKPOINT(iter->next->data)->coord) ) ) | |
392 | { | |
4f48c541 | 393 | num++; |
d6caf4c0 RN |
394 | // Maintain track segments |
395 | if ( VIK_TRACKPOINT(iter->next->data)->newsegment && (iter->next)->next ) | |
396 | VIK_TRACKPOINT(((iter->next)->next)->data)->newsegment = TRUE; | |
397 | ||
398 | vik_trackpoint_free ( iter->next->data ); | |
2a0cbd46 RN |
399 | tr->trackpoints = g_list_delete_link ( tr->trackpoints, iter->next ); |
400 | } | |
401 | else | |
402 | iter = iter->next; | |
403 | } | |
20981fd6 RN |
404 | |
405 | // NB isn't really be necessary as removing duplicate points shouldn't alter the bounds! | |
406 | vik_track_calculate_bounds ( tr ); | |
407 | ||
2a0cbd46 RN |
408 | return num; |
409 | } | |
410 | ||
411 | /* | |
412 | * Get a count of trackpoints with the same defined timestamp | |
413 | * Note is using timestamps with a resolution with 1 second | |
414 | */ | |
415 | gulong vik_track_get_same_time_point_count ( const VikTrack *tr ) | |
416 | { | |
417 | gulong num = 0; | |
418 | GList *iter = tr->trackpoints; | |
419 | while ( iter ) { | |
420 | if ( iter->next && | |
421 | ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
422 | VIK_TRACKPOINT(iter->next->data)->has_timestamp ) && | |
423 | ( VIK_TRACKPOINT(iter->data)->timestamp == | |
424 | VIK_TRACKPOINT(iter->next->data)->timestamp) ) | |
425 | num++; | |
426 | iter = iter->next; | |
427 | } | |
428 | return num; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Deletes adjacent points that have the same defined timestamp | |
433 | * Returns the number of points that were deleted | |
434 | */ | |
435 | gulong vik_track_remove_same_time_points ( VikTrack *tr ) | |
436 | { | |
437 | gulong num = 0; | |
438 | GList *iter = tr->trackpoints; | |
439 | while ( iter ) { | |
440 | if ( iter->next && | |
441 | ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
442 | VIK_TRACKPOINT(iter->next->data)->has_timestamp ) && | |
443 | ( VIK_TRACKPOINT(iter->data)->timestamp == | |
444 | VIK_TRACKPOINT(iter->next->data)->timestamp) ) { | |
445 | ||
446 | num++; | |
447 | ||
448 | // Maintain track segments | |
449 | if ( VIK_TRACKPOINT(iter->next->data)->newsegment && (iter->next)->next ) | |
450 | VIK_TRACKPOINT(((iter->next)->next)->data)->newsegment = TRUE; | |
451 | ||
452 | vik_trackpoint_free ( iter->next->data ); | |
50a14534 EB |
453 | tr->trackpoints = g_list_delete_link ( tr->trackpoints, iter->next ); |
454 | } | |
455 | else | |
456 | iter = iter->next; | |
457 | } | |
20981fd6 RN |
458 | |
459 | vik_track_calculate_bounds ( tr ); | |
460 | ||
4f48c541 | 461 | return num; |
50a14534 EB |
462 | } |
463 | ||
2f5d7ea1 RN |
464 | /* |
465 | * Deletes all 'extra' trackpoint information | |
466 | * such as time stamps, speed, course etc... | |
467 | */ | |
468 | void vik_track_to_routepoints ( VikTrack *tr ) | |
469 | { | |
470 | GList *iter = tr->trackpoints; | |
471 | while ( iter ) { | |
472 | ||
473 | // c.f. with vik_trackpoint_new() | |
474 | ||
475 | VIK_TRACKPOINT(iter->data)->has_timestamp = FALSE; | |
476 | VIK_TRACKPOINT(iter->data)->timestamp = 0; | |
477 | VIK_TRACKPOINT(iter->data)->speed = NAN; | |
478 | VIK_TRACKPOINT(iter->data)->course = NAN; | |
479 | VIK_TRACKPOINT(iter->data)->hdop = VIK_DEFAULT_DOP; | |
480 | VIK_TRACKPOINT(iter->data)->vdop = VIK_DEFAULT_DOP; | |
481 | VIK_TRACKPOINT(iter->data)->pdop = VIK_DEFAULT_DOP; | |
482 | VIK_TRACKPOINT(iter->data)->nsats = 0; | |
483 | VIK_TRACKPOINT(iter->data)->fix_mode = VIK_GPS_MODE_NOT_SEEN; | |
484 | ||
485 | iter = iter->next; | |
486 | } | |
487 | } | |
488 | ||
50a14534 EB |
489 | guint vik_track_get_segment_count(const VikTrack *tr) |
490 | { | |
491 | guint num = 1; | |
492 | GList *iter = tr->trackpoints; | |
493 | if ( !iter ) | |
494 | return 0; | |
495 | while ( (iter = iter->next) ) | |
496 | { | |
497 | if ( VIK_TRACKPOINT(iter->data)->newsegment ) | |
498 | num++; | |
499 | } | |
500 | return num; | |
501 | } | |
502 | ||
503 | VikTrack **vik_track_split_into_segments(VikTrack *t, guint *ret_len) | |
504 | { | |
505 | VikTrack **rv; | |
506 | VikTrack *tr; | |
507 | guint i; | |
508 | guint segs = vik_track_get_segment_count(t); | |
509 | GList *iter; | |
510 | ||
511 | if ( segs < 2 ) | |
512 | { | |
513 | *ret_len = 0; | |
514 | return NULL; | |
515 | } | |
516 | ||
517 | rv = g_malloc ( segs * sizeof(VikTrack *) ); | |
03817fbf | 518 | tr = vik_track_copy ( t, TRUE ); |
50a14534 EB |
519 | rv[0] = tr; |
520 | iter = tr->trackpoints; | |
521 | ||
522 | i = 1; | |
523 | while ( (iter = iter->next) ) | |
524 | { | |
525 | if ( VIK_TRACKPOINT(iter->data)->newsegment ) | |
526 | { | |
527 | iter->prev->next = NULL; | |
528 | iter->prev = NULL; | |
03817fbf | 529 | rv[i] = vik_track_copy ( tr, FALSE ); |
50a14534 | 530 | rv[i]->trackpoints = iter; |
20981fd6 RN |
531 | |
532 | vik_track_calculate_bounds ( rv[i] ); | |
533 | ||
50a14534 EB |
534 | i++; |
535 | } | |
536 | } | |
537 | *ret_len = segs; | |
538 | return rv; | |
539 | } | |
540 | ||
ce1c0489 RN |
541 | /* |
542 | * Simply remove any subsequent segment markers in a track to form one continuous track | |
543 | * Return the number of segments merged | |
544 | */ | |
545 | guint vik_track_merge_segments(VikTrack *tr) | |
546 | { | |
547 | guint num = 0; | |
548 | GList *iter = tr->trackpoints; | |
549 | if ( !iter ) | |
550 | return num; | |
551 | ||
552 | // Always skip the first point as this should be the first segment | |
553 | iter = iter->next; | |
554 | ||
555 | while ( (iter = iter->next) ) | |
556 | { | |
557 | if ( VIK_TRACKPOINT(iter->data)->newsegment ) { | |
558 | VIK_TRACKPOINT(iter->data)->newsegment = FALSE; | |
559 | num++; | |
560 | } | |
561 | } | |
562 | return num; | |
563 | } | |
564 | ||
50a14534 EB |
565 | void vik_track_reverse ( VikTrack *tr ) |
566 | { | |
3b5e6737 RN |
567 | if ( ! tr->trackpoints ) |
568 | return; | |
569 | ||
50a14534 EB |
570 | tr->trackpoints = g_list_reverse(tr->trackpoints); |
571 | ||
572 | /* fix 'newsegment' */ | |
3b5e6737 | 573 | GList *iter = g_list_last ( tr->trackpoints ); |
50a14534 EB |
574 | while ( iter ) |
575 | { | |
576 | if ( ! iter->next ) /* last segment, was first, cancel newsegment. */ | |
577 | VIK_TRACKPOINT(iter->data)->newsegment = FALSE; | |
578 | if ( ! iter->prev ) /* first segment by convention has newsegment flag. */ | |
579 | VIK_TRACKPOINT(iter->data)->newsegment = TRUE; | |
580 | else if ( VIK_TRACKPOINT(iter->data)->newsegment && iter->next ) | |
581 | { | |
582 | VIK_TRACKPOINT(iter->next->data)->newsegment = TRUE; | |
583 | VIK_TRACKPOINT(iter->data)->newsegment = FALSE; | |
584 | } | |
585 | iter = iter->prev; | |
586 | } | |
587 | } | |
588 | ||
07378116 RN |
589 | /** |
590 | * vik_track_get_duration: | |
591 | * @trk: The track | |
d4cf08c5 | 592 | * @segment_gaps: Whether the duration should include gaps between segments |
07378116 | 593 | * |
d4cf08c5 | 594 | * Returns: The time in seconds |
07378116 RN |
595 | * NB this may be negative particularly if the track has been reversed |
596 | */ | |
d4cf08c5 | 597 | time_t vik_track_get_duration(const VikTrack *trk, gboolean segment_gaps) |
07378116 RN |
598 | { |
599 | time_t duration = 0; | |
600 | if ( trk->trackpoints ) { | |
601 | // Ensure times are available | |
602 | if ( vik_track_get_tp_first(trk)->has_timestamp ) { | |
603 | // Get trkpt only once - as using vik_track_get_tp_last() iterates whole track each time | |
d4cf08c5 RN |
604 | if (segment_gaps) { |
605 | // Simple duration | |
606 | VikTrackpoint *trkpt_last = vik_track_get_tp_last(trk); | |
607 | if ( trkpt_last->has_timestamp ) { | |
608 | time_t t1 = vik_track_get_tp_first(trk)->timestamp; | |
609 | time_t t2 = trkpt_last->timestamp; | |
610 | duration = t2 - t1; | |
611 | } | |
612 | } | |
613 | else { | |
614 | // Total within segments | |
615 | GList *iter = trk->trackpoints->next; | |
616 | while (iter) { | |
617 | if ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
618 | VIK_TRACKPOINT(iter->prev->data)->has_timestamp && | |
619 | (!VIK_TRACKPOINT(iter->data)->newsegment) ) { | |
620 | duration += ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp); | |
621 | } | |
622 | iter = iter->next; | |
623 | } | |
07378116 RN |
624 | } |
625 | } | |
626 | } | |
627 | return duration; | |
628 | } | |
629 | ||
50a14534 EB |
630 | gdouble vik_track_get_average_speed(const VikTrack *tr) |
631 | { | |
632 | gdouble len = 0.0; | |
633 | guint32 time = 0; | |
634 | if ( tr->trackpoints ) | |
635 | { | |
636 | GList *iter = tr->trackpoints->next; | |
637 | while (iter) | |
638 | { | |
639 | if ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
640 | VIK_TRACKPOINT(iter->prev->data)->has_timestamp && | |
641 | (! VIK_TRACKPOINT(iter->data)->newsegment) ) | |
642 | { | |
643 | len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
644 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
645 | time += ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp); | |
646 | } | |
647 | iter = iter->next; | |
648 | } | |
649 | } | |
650 | return (time == 0) ? 0 : ABS(len/time); | |
651 | } | |
652 | ||
4c21c2fa RN |
653 | /** |
654 | * Based on a simple average speed, but with a twist - to give a moving average. | |
655 | * . GPSs often report a moving average in their statistics output | |
656 | * . bicycle speedos often don't factor in time when stopped - hence reporting a moving average for speed | |
657 | * | |
658 | * Often GPS track will record every second but not when stationary | |
659 | * This method doesn't use samples that differ over the specified time limit - effectively skipping that time chunk from the total time | |
660 | * | |
661 | * Suggest to use 60 seconds as the stop length (as the default used in the TrackWaypoint draw stops factor) | |
662 | */ | |
663 | gdouble vik_track_get_average_speed_moving (const VikTrack *tr, int stop_length_seconds) | |
664 | { | |
665 | gdouble len = 0.0; | |
666 | guint32 time = 0; | |
667 | if ( tr->trackpoints ) | |
668 | { | |
669 | GList *iter = tr->trackpoints->next; | |
670 | while (iter) | |
671 | { | |
672 | if ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
673 | VIK_TRACKPOINT(iter->prev->data)->has_timestamp && | |
674 | (! VIK_TRACKPOINT(iter->data)->newsegment) ) | |
675 | { | |
676 | if ( ( VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp ) < stop_length_seconds ) { | |
677 | len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
678 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
679 | ||
680 | time += ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp); | |
681 | } | |
682 | } | |
683 | iter = iter->next; | |
684 | } | |
685 | } | |
686 | return (time == 0) ? 0 : ABS(len/time); | |
687 | } | |
688 | ||
50a14534 EB |
689 | gdouble vik_track_get_max_speed(const VikTrack *tr) |
690 | { | |
691 | gdouble maxspeed = 0.0, speed = 0.0; | |
692 | if ( tr->trackpoints ) | |
693 | { | |
694 | GList *iter = tr->trackpoints->next; | |
695 | while (iter) | |
696 | { | |
697 | if ( VIK_TRACKPOINT(iter->data)->has_timestamp && | |
698 | VIK_TRACKPOINT(iter->prev->data)->has_timestamp && | |
699 | (! VIK_TRACKPOINT(iter->data)->newsegment) ) | |
700 | { | |
701 | speed = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), &(VIK_TRACKPOINT(iter->prev->data)->coord) ) | |
702 | / ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp); | |
703 | if ( speed > maxspeed ) | |
704 | maxspeed = speed; | |
705 | } | |
706 | iter = iter->next; | |
707 | } | |
708 | } | |
709 | return maxspeed; | |
710 | } | |
711 | ||
712 | void vik_track_convert ( VikTrack *tr, VikCoordMode dest_mode ) | |
713 | { | |
714 | GList *iter = tr->trackpoints; | |
715 | while (iter) | |
716 | { | |
717 | vik_coord_convert ( &(VIK_TRACKPOINT(iter->data)->coord), dest_mode ); | |
718 | iter = iter->next; | |
719 | } | |
720 | } | |
721 | ||
722 | /* I understood this when I wrote it ... maybe ... Basically it eats up the | |
723 | * proper amounts of length on the track and averages elevation over that. */ | |
724 | gdouble *vik_track_make_elevation_map ( const VikTrack *tr, guint16 num_chunks ) | |
725 | { | |
726 | gdouble *pts; | |
727 | gdouble total_length, chunk_length, current_dist, current_area_under_curve, current_seg_length, dist_along_seg = 0.0; | |
728 | gdouble altitude1, altitude2; | |
729 | guint16 current_chunk; | |
730 | gboolean ignore_it = FALSE; | |
731 | ||
732 | GList *iter = tr->trackpoints; | |
733 | ||
c3deba01 | 734 | if (!iter || !iter->next) /* zero- or one-point track */ |
4b31042b QT |
735 | return NULL; |
736 | ||
c79f0206 EB |
737 | { /* test if there's anything worth calculating */ |
738 | gboolean okay = FALSE; | |
739 | while ( iter ) | |
740 | { | |
5c280098 RN |
741 | // Sometimes a GPS device (or indeed any random file) can have stupid numbers for elevations |
742 | // Since when is 9.9999e+24 a valid elevation!! | |
743 | // This can happen when a track (with no elevations) is uploaded to a GPS device and then redownloaded (e.g. using a Garmin Legend EtrexHCx) | |
744 | // Some protection against trying to work with crazily massive numbers (otherwise get SIGFPE, Arithmetic exception) | |
745 | if ( VIK_TRACKPOINT(iter->data)->altitude != VIK_DEFAULT_ALTITUDE && | |
746 | VIK_TRACKPOINT(iter->data)->altitude < 1E9 ) { | |
c79f0206 EB |
747 | okay = TRUE; break; |
748 | } | |
749 | iter = iter->next; | |
750 | } | |
751 | if ( ! okay ) | |
752 | return NULL; | |
753 | } | |
754 | ||
0f941532 | 755 | iter = tr->trackpoints; |
c79f0206 | 756 | |
50a14534 EB |
757 | g_assert ( num_chunks < 16000 ); |
758 | ||
759 | pts = g_malloc ( sizeof(gdouble) * num_chunks ); | |
760 | ||
761 | total_length = vik_track_get_length_including_gaps ( tr ); | |
762 | chunk_length = total_length / num_chunks; | |
763 | ||
6374e157 | 764 | /* Zero chunk_length (eg, track of 2 tp with the same loc) will cause crash */ |
3b36279c JJ |
765 | if (chunk_length <= 0) { |
766 | g_free(pts); | |
6374e157 | 767 | return NULL; |
3b36279c | 768 | } |
6374e157 | 769 | |
50a14534 EB |
770 | current_dist = 0.0; |
771 | current_area_under_curve = 0; | |
772 | current_chunk = 0; | |
773 | current_seg_length = 0; | |
774 | ||
775 | current_seg_length = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
776 | &(VIK_TRACKPOINT(iter->next->data)->coord) ); | |
777 | altitude1 = VIK_TRACKPOINT(iter->data)->altitude; | |
778 | altitude2 = VIK_TRACKPOINT(iter->next->data)->altitude; | |
779 | dist_along_seg = 0; | |
780 | ||
781 | while ( current_chunk < num_chunks ) { | |
782 | ||
783 | /* go along current seg */ | |
784 | if ( current_seg_length && (current_seg_length - dist_along_seg) > chunk_length ) { | |
785 | dist_along_seg += chunk_length; | |
786 | ||
787 | /* / | |
788 | * pt2 * | |
789 | * /x altitude = alt_at_pt_1 + alt_at_pt_2 / 2 = altitude1 + slope * dist_value_of_pt_inbetween_pt1_and_pt2 | |
790 | * /xx avg altitude = area under curve / chunk len | |
791 | *pt1 *xxx avg altitude = altitude1 + (altitude2-altitude1)/(current_seg_length)*(dist_along_seg + (chunk_len/2)) | |
792 | * / xxx | |
793 | * / xxx | |
794 | **/ | |
795 | ||
796 | if ( ignore_it ) | |
aebc49f4 RN |
797 | // Seemly can't determine average for this section - so use last known good value (much better than just sticking in zero) |
798 | pts[current_chunk] = altitude1; | |
50a14534 | 799 | else |
9903c388 | 800 | pts[current_chunk] = altitude1 + (altitude2-altitude1)*((dist_along_seg - (chunk_length/2))/current_seg_length); |
50a14534 EB |
801 | |
802 | current_chunk++; | |
803 | } else { | |
804 | /* finish current seg */ | |
805 | if ( current_seg_length ) { | |
806 | gdouble altitude_at_dist_along_seg = altitude1 + (altitude2-altitude1)/(current_seg_length)*dist_along_seg; | |
807 | current_dist = current_seg_length - dist_along_seg; | |
808 | current_area_under_curve = current_dist*(altitude_at_dist_along_seg + altitude2)*0.5; | |
809 | } else { current_dist = current_area_under_curve = 0; } /* should only happen if first current_seg_length == 0 */ | |
810 | ||
811 | /* get intervening segs */ | |
812 | iter = iter->next; | |
813 | while ( iter && iter->next ) { | |
814 | current_seg_length = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
815 | &(VIK_TRACKPOINT(iter->next->data)->coord) ); | |
816 | altitude1 = VIK_TRACKPOINT(iter->data)->altitude; | |
817 | altitude2 = VIK_TRACKPOINT(iter->next->data)->altitude; | |
818 | ignore_it = VIK_TRACKPOINT(iter->next->data)->newsegment; | |
819 | ||
820 | if ( chunk_length - current_dist >= current_seg_length ) { | |
821 | current_dist += current_seg_length; | |
822 | current_area_under_curve += current_seg_length * (altitude1+altitude2) * 0.5; | |
823 | iter = iter->next; | |
824 | } else { | |
825 | break; | |
826 | } | |
827 | } | |
828 | ||
829 | /* final seg */ | |
830 | dist_along_seg = chunk_length - current_dist; | |
fa396b8a | 831 | if ( ignore_it || ( iter && !iter->next ) ) { |
50a14534 | 832 | pts[current_chunk] = current_area_under_curve / current_dist; |
61950ef8 QT |
833 | if (!iter->next) { |
834 | int i; | |
835 | for (i = current_chunk + 1; i < num_chunks; i++) | |
836 | pts[i] = pts[current_chunk]; | |
837 | break; | |
838 | } | |
9903c388 | 839 | } |
50a14534 EB |
840 | else { |
841 | current_area_under_curve += dist_along_seg * (altitude1 + (altitude2 - altitude1)*dist_along_seg/current_seg_length); | |
842 | pts[current_chunk] = current_area_under_curve / chunk_length; | |
843 | } | |
844 | ||
845 | current_dist = 0; | |
846 | current_chunk++; | |
847 | } | |
848 | } | |
849 | ||
850 | return pts; | |
851 | } | |
852 | ||
853 | ||
854 | void vik_track_get_total_elevation_gain(const VikTrack *tr, gdouble *up, gdouble *down) | |
855 | { | |
856 | gdouble diff; | |
857 | *up = *down = 0; | |
8c4f1350 | 858 | if ( tr->trackpoints && VIK_TRACKPOINT(tr->trackpoints->data)->altitude != VIK_DEFAULT_ALTITUDE ) |
50a14534 EB |
859 | { |
860 | GList *iter = tr->trackpoints->next; | |
861 | while (iter) | |
862 | { | |
863 | diff = VIK_TRACKPOINT(iter->data)->altitude - VIK_TRACKPOINT(iter->prev->data)->altitude; | |
864 | if ( diff > 0 ) | |
865 | *up += diff; | |
866 | else | |
867 | *down -= diff; | |
868 | iter = iter->next; | |
869 | } | |
bf35388d EB |
870 | } else |
871 | *up = *down = VIK_DEFAULT_ALTITUDE; | |
872 | } | |
873 | ||
0ba33e1d FA |
874 | gdouble *vik_track_make_gradient_map ( const VikTrack *tr, guint16 num_chunks ) |
875 | { | |
876 | gdouble *pts; | |
877 | gdouble *altitudes; | |
878 | gdouble total_length, chunk_length, current_gradient; | |
879 | gdouble altitude1, altitude2; | |
880 | guint16 current_chunk; | |
881 | ||
882 | g_assert ( num_chunks < 16000 ); | |
883 | ||
884 | total_length = vik_track_get_length_including_gaps ( tr ); | |
885 | chunk_length = total_length / num_chunks; | |
886 | ||
887 | /* Zero chunk_length (eg, track of 2 tp with the same loc) will cause crash */ | |
888 | if (chunk_length <= 0) { | |
889 | return NULL; | |
890 | } | |
891 | ||
892 | altitudes = vik_track_make_elevation_map (tr, num_chunks); | |
893 | if (altitudes == NULL) { | |
894 | return NULL; | |
895 | } | |
896 | ||
897 | current_gradient = 0.0; | |
898 | pts = g_malloc ( sizeof(gdouble) * num_chunks ); | |
899 | for (current_chunk = 0; current_chunk < (num_chunks - 1); current_chunk++) { | |
900 | altitude1 = altitudes[current_chunk]; | |
901 | altitude2 = altitudes[current_chunk + 1]; | |
902 | current_gradient = 100.0 * (altitude2 - altitude1) / chunk_length; | |
903 | ||
904 | pts[current_chunk] = current_gradient; | |
905 | } | |
906 | ||
907 | pts[current_chunk] = current_gradient; | |
908 | ||
0215dea4 RN |
909 | g_free ( altitudes ); |
910 | ||
0ba33e1d FA |
911 | return pts; |
912 | } | |
25e44eac | 913 | |
bf35388d | 914 | /* by Alex Foobarian */ |
25e44eac AF |
915 | gdouble *vik_track_make_speed_map ( const VikTrack *tr, guint16 num_chunks ) |
916 | { | |
bf35388d | 917 | gdouble *v, *s, *t; |
0654760a | 918 | gdouble duration, chunk_dur; |
25e44eac | 919 | time_t t1, t2; |
d03d80e6 | 920 | int i, pt_count, numpts, index; |
bf35388d | 921 | GList *iter; |
25e44eac | 922 | |
24d5c7e2 EB |
923 | if ( ! tr->trackpoints ) |
924 | return NULL; | |
25e44eac | 925 | |
24d5c7e2 | 926 | g_assert ( num_chunks < 16000 ); |
25e44eac AF |
927 | |
928 | t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
929 | t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp; | |
930 | duration = t2 - t1; | |
c79f0206 EB |
931 | |
932 | if ( !t1 || !t2 || !duration ) | |
933 | return NULL; | |
934 | ||
25e44eac | 935 | if (duration < 0) { |
4258f4e2 | 936 | g_warning("negative duration: unsorted trackpoint timestamps?"); |
25e44eac AF |
937 | return NULL; |
938 | } | |
bf35388d | 939 | pt_count = vik_track_get_tp_count(tr); |
24d5c7e2 | 940 | |
bf35388d | 941 | v = g_malloc ( sizeof(gdouble) * num_chunks ); |
25e44eac | 942 | chunk_dur = duration / num_chunks; |
bf35388d EB |
943 | |
944 | s = g_malloc(sizeof(double) * pt_count); | |
945 | t = g_malloc(sizeof(double) * pt_count); | |
bf35388d EB |
946 | |
947 | iter = tr->trackpoints->next; | |
948 | numpts = 0; | |
949 | s[0] = 0; | |
e979bdab | 950 | t[0] = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; |
bf35388d EB |
951 | numpts++; |
952 | while (iter) { | |
953 | s[numpts] = s[numpts-1] + vik_coord_diff ( &(VIK_TRACKPOINT(iter->prev->data)->coord), &(VIK_TRACKPOINT(iter->data)->coord) ); | |
954 | t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp; | |
955 | numpts++; | |
956 | iter = iter->next; | |
25e44eac AF |
957 | } |
958 | ||
d03d80e6 AF |
959 | /* In the following computation, we iterate through periods of time of duration chunk_dur. |
960 | * The first period begins at the beginning of the track. The last period ends at the end of the track. | |
bf35388d | 961 | */ |
d03d80e6 AF |
962 | index = 0; /* index of the current trackpoint. */ |
963 | for (i = 0; i < num_chunks; i++) { | |
964 | /* we are now covering the interval from t[0] + i*chunk_dur to t[0] + (i+1)*chunk_dur. | |
965 | * find the first trackpoint outside the current interval, averaging the speeds between intermediate trackpoints. | |
966 | */ | |
967 | if (t[0] + i*chunk_dur >= t[index]) { | |
968 | gdouble acc_t = 0, acc_s = 0; | |
d03d80e6 AF |
969 | while (t[0] + i*chunk_dur >= t[index]) { |
970 | acc_s += (s[index+1]-s[index]); | |
971 | acc_t += (t[index+1]-t[index]); | |
972 | index++; | |
d03d80e6 AF |
973 | } |
974 | v[i] = acc_s/acc_t; | |
975 | } | |
976 | else if (i) { | |
977 | v[i] = v[i-1]; | |
978 | } | |
979 | else { | |
980 | v[i] = 0; | |
bf35388d | 981 | } |
bf35388d EB |
982 | } |
983 | g_free(s); | |
984 | g_free(t); | |
bf35388d | 985 | return v; |
25e44eac | 986 | } |
24d5c7e2 | 987 | |
926c8140 RN |
988 | /** |
989 | * Make a distance/time map, heavily based on the vik_track_make_speed_map method | |
990 | */ | |
991 | gdouble *vik_track_make_distance_map ( const VikTrack *tr, guint16 num_chunks ) | |
992 | { | |
993 | gdouble *v, *s, *t; | |
994 | gdouble duration, chunk_dur; | |
995 | time_t t1, t2; | |
996 | int i, pt_count, numpts, index; | |
997 | GList *iter; | |
998 | ||
999 | if ( ! tr->trackpoints ) | |
1000 | return NULL; | |
1001 | ||
1002 | t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
1003 | t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp; | |
1004 | duration = t2 - t1; | |
1005 | ||
1006 | if ( !t1 || !t2 || !duration ) | |
1007 | return NULL; | |
1008 | ||
1009 | if (duration < 0) { | |
1010 | g_warning("negative duration: unsorted trackpoint timestamps?"); | |
1011 | return NULL; | |
1012 | } | |
1013 | pt_count = vik_track_get_tp_count(tr); | |
1014 | ||
1015 | v = g_malloc ( sizeof(gdouble) * num_chunks ); | |
1016 | chunk_dur = duration / num_chunks; | |
1017 | ||
1018 | s = g_malloc(sizeof(double) * pt_count); | |
1019 | t = g_malloc(sizeof(double) * pt_count); | |
1020 | ||
1021 | iter = tr->trackpoints->next; | |
1022 | numpts = 0; | |
1023 | s[0] = 0; | |
e979bdab | 1024 | t[0] = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; |
926c8140 RN |
1025 | numpts++; |
1026 | while (iter) { | |
1027 | s[numpts] = s[numpts-1] + vik_coord_diff ( &(VIK_TRACKPOINT(iter->prev->data)->coord), &(VIK_TRACKPOINT(iter->data)->coord) ); | |
1028 | t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp; | |
1029 | numpts++; | |
1030 | iter = iter->next; | |
1031 | } | |
1032 | ||
1033 | /* In the following computation, we iterate through periods of time of duration chunk_dur. | |
1034 | * The first period begins at the beginning of the track. The last period ends at the end of the track. | |
1035 | */ | |
1036 | index = 0; /* index of the current trackpoint. */ | |
1037 | for (i = 0; i < num_chunks; i++) { | |
1038 | /* we are now covering the interval from t[0] + i*chunk_dur to t[0] + (i+1)*chunk_dur. | |
1039 | * find the first trackpoint outside the current interval, averaging the distance between intermediate trackpoints. | |
1040 | */ | |
1041 | if (t[0] + i*chunk_dur >= t[index]) { | |
1042 | gdouble acc_s = 0; // No need for acc_t | |
1043 | while (t[0] + i*chunk_dur >= t[index]) { | |
1044 | acc_s += (s[index+1]-s[index]); | |
1045 | index++; | |
1046 | } | |
1047 | // The only bit that's really different from the speed map - just keep an accululative record distance | |
1048 | v[i] = i ? v[i-1]+acc_s : acc_s; | |
1049 | } | |
1050 | else if (i) { | |
1051 | v[i] = v[i-1]; | |
1052 | } | |
1053 | else { | |
1054 | v[i] = 0; | |
1055 | } | |
1056 | } | |
1057 | g_free(s); | |
1058 | g_free(t); | |
1059 | return v; | |
1060 | } | |
1061 | ||
8de26632 RN |
1062 | /** |
1063 | * This uses the 'time' based method to make the graph, (which is a simpler compared to the elevation/distance) | |
1064 | * This results in a slightly blocky graph when it does not have many trackpoints: <60 | |
1065 | * NB Somehow the elevation/distance applies some kind of smoothing algorithm, | |
1066 | * but I don't think any one understands it any more (I certainly don't ATM) | |
1067 | */ | |
1068 | gdouble *vik_track_make_elevation_time_map ( const VikTrack *tr, guint16 num_chunks ) | |
1069 | { | |
1070 | time_t t1, t2; | |
1071 | gdouble duration, chunk_dur; | |
1072 | GList *iter = tr->trackpoints; | |
1073 | ||
1074 | if (!iter || !iter->next) /* zero- or one-point track */ | |
1075 | return NULL; | |
1076 | ||
1077 | /* test if there's anything worth calculating */ | |
1078 | gboolean okay = FALSE; | |
1079 | while ( iter ) { | |
1080 | if ( VIK_TRACKPOINT(iter->data)->altitude != VIK_DEFAULT_ALTITUDE ) { | |
1081 | okay = TRUE; | |
1082 | break; | |
1083 | } | |
1084 | iter = iter->next; | |
1085 | } | |
1086 | if ( ! okay ) | |
1087 | return NULL; | |
1088 | ||
1089 | t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
1090 | t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp; | |
1091 | duration = t2 - t1; | |
1092 | ||
1093 | if ( !t1 || !t2 || !duration ) | |
1094 | return NULL; | |
1095 | ||
1096 | if (duration < 0) { | |
1097 | g_warning("negative duration: unsorted trackpoint timestamps?"); | |
1098 | return NULL; | |
1099 | } | |
1100 | gint pt_count = vik_track_get_tp_count(tr); | |
1101 | ||
1102 | // Reset iterator back to the beginning | |
1103 | iter = tr->trackpoints; | |
1104 | ||
1105 | gdouble *pts = g_malloc ( sizeof(gdouble) * num_chunks ); // The return altitude values | |
1106 | gdouble *s = g_malloc(sizeof(double) * pt_count); // calculation altitudes | |
1107 | gdouble *t = g_malloc(sizeof(double) * pt_count); // calculation times | |
1108 | ||
1109 | chunk_dur = duration / num_chunks; | |
1110 | ||
1111 | s[0] = VIK_TRACKPOINT(iter->data)->altitude; | |
1112 | t[0] = VIK_TRACKPOINT(iter->data)->timestamp; | |
1113 | iter = tr->trackpoints->next; | |
1114 | gint numpts = 1; | |
1115 | while (iter) { | |
1116 | s[numpts] = VIK_TRACKPOINT(iter->data)->altitude; | |
1117 | t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp; | |
1118 | numpts++; | |
1119 | iter = iter->next; | |
1120 | } | |
1121 | ||
1122 | /* In the following computation, we iterate through periods of time of duration chunk_dur. | |
1123 | * The first period begins at the beginning of the track. The last period ends at the end of the track. | |
1124 | */ | |
1125 | gint index = 0; /* index of the current trackpoint. */ | |
1126 | gint i; | |
1127 | for (i = 0; i < num_chunks; i++) { | |
1128 | /* we are now covering the interval from t[0] + i*chunk_dur to t[0] + (i+1)*chunk_dur. | |
1129 | * find the first trackpoint outside the current interval, averaging the heights between intermediate trackpoints. | |
1130 | */ | |
1131 | if (t[0] + i*chunk_dur >= t[index]) { | |
1132 | gdouble acc_s = s[index]; // initialise to first point | |
1133 | while (t[0] + i*chunk_dur >= t[index]) { | |
1134 | acc_s += (s[index+1]-s[index]); | |
1135 | index++; | |
1136 | } | |
1137 | pts[i] = acc_s; | |
1138 | } | |
1139 | else if (i) { | |
1140 | pts[i] = pts[i-1]; | |
1141 | } | |
1142 | else { | |
1143 | pts[i] = 0; | |
1144 | } | |
1145 | } | |
1146 | g_free(s); | |
1147 | g_free(t); | |
1148 | ||
1149 | return pts; | |
1150 | } | |
1151 | ||
7b624086 RN |
1152 | /** |
1153 | * Make a speed/distance map | |
1154 | */ | |
1155 | gdouble *vik_track_make_speed_dist_map ( const VikTrack *tr, guint16 num_chunks ) | |
1156 | { | |
1157 | gdouble *v, *s, *t; | |
1158 | time_t t1, t2; | |
1159 | gint i, pt_count, numpts, index; | |
1160 | GList *iter; | |
1161 | gdouble duration, total_length, chunk_length; | |
1162 | ||
1163 | if ( ! tr->trackpoints ) | |
1164 | return NULL; | |
1165 | ||
1166 | t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
1167 | t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp; | |
1168 | duration = t2 - t1; | |
1169 | ||
1170 | if ( !t1 || !t2 || !duration ) | |
1171 | return NULL; | |
1172 | ||
1173 | if (duration < 0) { | |
1174 | g_warning("negative duration: unsorted trackpoint timestamps?"); | |
1175 | return NULL; | |
1176 | } | |
1177 | ||
1178 | total_length = vik_track_get_length_including_gaps ( tr ); | |
1179 | chunk_length = total_length / num_chunks; | |
1180 | pt_count = vik_track_get_tp_count(tr); | |
1181 | ||
1182 | if (chunk_length <= 0) { | |
1183 | return NULL; | |
1184 | } | |
1185 | ||
1186 | v = g_malloc ( sizeof(gdouble) * num_chunks ); | |
1187 | s = g_malloc ( sizeof(double) * pt_count ); | |
1188 | t = g_malloc ( sizeof(double) * pt_count ); | |
1189 | ||
1190 | // No special handling of segments ATM... | |
1191 | iter = tr->trackpoints->next; | |
1192 | numpts = 0; | |
1193 | s[0] = 0; | |
e979bdab | 1194 | t[0] = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; |
7b624086 RN |
1195 | numpts++; |
1196 | while (iter) { | |
1197 | s[numpts] = s[numpts-1] + vik_coord_diff ( &(VIK_TRACKPOINT(iter->prev->data)->coord), &(VIK_TRACKPOINT(iter->data)->coord) ); | |
1198 | t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp; | |
1199 | numpts++; | |
1200 | iter = iter->next; | |
1201 | } | |
1202 | ||
1203 | // Iterate through a portion of the track to get an average speed for that part | |
1204 | // This will essentially interpolate between segments, which I think is right given the usage of 'get_length_including_gaps' | |
1205 | index = 0; /* index of the current trackpoint. */ | |
1206 | for (i = 0; i < num_chunks; i++) { | |
1207 | // Similar to the make_speed_map, but instead of using a time chunk, use a distance chunk | |
1208 | if (s[0] + i*chunk_length >= s[index]) { | |
1209 | gdouble acc_t = 0, acc_s = 0; | |
1210 | while (s[0] + i*chunk_length >= s[index]) { | |
1211 | acc_s += (s[index+1]-s[index]); | |
1212 | acc_t += (t[index+1]-t[index]); | |
1213 | index++; | |
1214 | } | |
1215 | v[i] = acc_s/acc_t; | |
1216 | } | |
1217 | else if (i) { | |
1218 | v[i] = v[i-1]; | |
1219 | } | |
1220 | else { | |
1221 | v[i] = 0; | |
1222 | } | |
1223 | } | |
1224 | g_free(s); | |
1225 | g_free(t); | |
1226 | return v; | |
1227 | } | |
1228 | ||
e58bcab1 RN |
1229 | /** |
1230 | * vik_track_get_tp_by_dist: | |
1231 | * @trk: The Track on which to find a Trackpoint | |
1232 | * @meters_from_start: The distance along a track that the trackpoint returned is near | |
1233 | * @get_next_point: Since there is a choice of trackpoints, this determines which one to return | |
1234 | * @tp_metres_from_start: For the returned Trackpoint, returns the distance along the track | |
1235 | * | |
1236 | * TODO: Consider changing the boolean get_next_point into an enum with these options PREVIOUS, NEXT, NEAREST | |
1237 | * | |
1238 | * Returns: The #VikTrackpoint fitting the criteria or NULL | |
1239 | */ | |
1240 | VikTrackpoint *vik_track_get_tp_by_dist ( VikTrack *trk, gdouble meters_from_start, gboolean get_next_point, gdouble *tp_metres_from_start ) | |
1241 | { | |
1242 | gdouble current_dist = 0.0; | |
1243 | gdouble current_inc = 0.0; | |
1244 | if ( tp_metres_from_start ) | |
1245 | *tp_metres_from_start = 0.0; | |
1246 | ||
1247 | if ( trk->trackpoints ) { | |
1248 | GList *iter = g_list_next ( g_list_first ( trk->trackpoints ) ); | |
1249 | while (iter) { | |
1250 | current_inc = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
1251 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
1252 | current_dist += current_inc; | |
1253 | if ( current_dist >= meters_from_start ) | |
1254 | break; | |
1255 | iter = g_list_next ( iter ); | |
1256 | } | |
1257 | // passed the end of the track | |
1258 | if ( !iter ) | |
1259 | return NULL; | |
1260 | ||
1261 | if ( tp_metres_from_start ) | |
1262 | *tp_metres_from_start = current_dist; | |
1263 | ||
1264 | // we've gone past the distance already, is the previous trackpoint wanted? | |
1265 | if ( !get_next_point ) { | |
1266 | if ( iter->prev ) { | |
1267 | if ( tp_metres_from_start ) | |
1268 | *tp_metres_from_start = current_dist-current_inc; | |
1269 | return VIK_TRACKPOINT(iter->prev->data); | |
1270 | } | |
1271 | } | |
1272 | return VIK_TRACKPOINT(iter->data); | |
1273 | } | |
1274 | ||
1275 | return NULL; | |
1276 | } | |
1277 | ||
bf35388d | 1278 | /* by Alex Foobarian */ |
ddc2372e | 1279 | VikTrackpoint *vik_track_get_closest_tp_by_percentage_dist ( VikTrack *tr, gdouble reldist, gdouble *meters_from_start ) |
24d5c7e2 EB |
1280 | { |
1281 | gdouble dist = vik_track_get_length_including_gaps(tr) * reldist; | |
1282 | gdouble current_dist = 0.0; | |
1283 | gdouble current_inc = 0.0; | |
24d5c7e2 EB |
1284 | if ( tr->trackpoints ) |
1285 | { | |
1286 | GList *iter = tr->trackpoints->next; | |
ecb51018 | 1287 | GList *last_iter = NULL; |
ddc2372e | 1288 | gdouble last_dist = 0.0; |
24d5c7e2 EB |
1289 | while (iter) |
1290 | { | |
1291 | current_inc = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), | |
1292 | &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
ddc2372e | 1293 | last_dist = current_dist; |
24d5c7e2 EB |
1294 | current_dist += current_inc; |
1295 | if ( current_dist >= dist ) | |
1296 | break; | |
ecb51018 | 1297 | last_iter = iter; |
24d5c7e2 EB |
1298 | iter = iter->next; |
1299 | } | |
ddc2372e QT |
1300 | if (!iter) { /* passing the end the track */ |
1301 | if (last_iter) { | |
1302 | if (meters_from_start) | |
1303 | *meters_from_start = last_dist; | |
1304 | return(VIK_TRACKPOINT(last_iter->data)); | |
1305 | } | |
1306 | else | |
1307 | return NULL; | |
1308 | } | |
24d5c7e2 EB |
1309 | /* we've gone past the dist already, was prev trackpoint closer? */ |
1310 | /* should do a vik_coord_average_weighted() thingy. */ | |
4f5f4ec2 | 1311 | if ( iter->prev && fabs(current_dist-current_inc-dist) < fabs(current_dist-dist) ) { |
ddc2372e QT |
1312 | if (meters_from_start) |
1313 | *meters_from_start = last_dist; | |
24d5c7e2 | 1314 | iter = iter->prev; |
ddc2372e QT |
1315 | } |
1316 | else | |
1317 | if (meters_from_start) | |
1318 | *meters_from_start = current_dist; | |
24d5c7e2 | 1319 | |
e1e2f2c6 | 1320 | return VIK_TRACKPOINT(iter->data); |
24d5c7e2 EB |
1321 | |
1322 | } | |
1323 | return NULL; | |
1324 | } | |
b42a25ba | 1325 | |
ddc2372e | 1326 | VikTrackpoint *vik_track_get_closest_tp_by_percentage_time ( VikTrack *tr, gdouble reltime, time_t *seconds_from_start ) |
32e48121 | 1327 | { |
1b051945 RN |
1328 | if ( !tr->trackpoints ) |
1329 | return NULL; | |
1330 | ||
32e48121 QT |
1331 | time_t t_pos, t_start, t_end, t_total; |
1332 | t_start = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
1333 | t_end = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp; | |
1334 | t_total = t_end - t_start; | |
1335 | ||
1336 | t_pos = t_start + t_total * reltime; | |
1337 | ||
ddc2372e QT |
1338 | GList *iter = tr->trackpoints; |
1339 | ||
1340 | while (iter) { | |
1341 | if (VIK_TRACKPOINT(iter->data)->timestamp == t_pos) | |
1342 | break; | |
1343 | if (VIK_TRACKPOINT(iter->data)->timestamp > t_pos) { | |
1344 | if (iter->prev == NULL) /* first trackpoint */ | |
1345 | break; | |
16dcb4dd | 1346 | time_t t_before = t_pos - VIK_TRACKPOINT(iter->prev->data)->timestamp; |
ddc2372e QT |
1347 | time_t t_after = VIK_TRACKPOINT(iter->data)->timestamp - t_pos; |
1348 | if (t_before <= t_after) | |
1349 | iter = iter->prev; | |
1350 | break; | |
32e48121 | 1351 | } |
ddc2372e QT |
1352 | else if ((iter->next == NULL) && (t_pos < (VIK_TRACKPOINT(iter->data)->timestamp + 3))) /* last trackpoint: accommodate for round-off */ |
1353 | break; | |
1354 | iter = iter->next; | |
32e48121 | 1355 | } |
ddc2372e QT |
1356 | |
1357 | if (!iter) | |
1358 | return NULL; | |
1359 | if (seconds_from_start) | |
1360 | *seconds_from_start = VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(tr->trackpoints->data)->timestamp; | |
1361 | return VIK_TRACKPOINT(iter->data); | |
32e48121 QT |
1362 | } |
1363 | ||
03e7da75 RN |
1364 | VikTrackpoint* vik_track_get_tp_by_max_speed ( const VikTrack *tr ) |
1365 | { | |
1366 | gdouble maxspeed = 0.0, speed = 0.0; | |
1367 | ||
1368 | if ( !tr->trackpoints ) | |
1369 | return NULL; | |
1370 | ||
1371 | GList *iter = tr->trackpoints; | |
1372 | VikTrackpoint *max_speed_tp = NULL; | |
1373 | ||
1374 | while (iter) { | |
7d7acd6d | 1375 | if (iter->prev) { |
03e7da75 RN |
1376 | if ( VIK_TRACKPOINT(iter->data)->has_timestamp && |
1377 | VIK_TRACKPOINT(iter->prev->data)->has_timestamp && | |
1378 | (! VIK_TRACKPOINT(iter->data)->newsegment) ) { | |
1379 | speed = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), &(VIK_TRACKPOINT(iter->prev->data)->coord) ) | |
1380 | / ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp); | |
1381 | if ( speed > maxspeed ) { | |
1382 | maxspeed = speed; | |
1383 | max_speed_tp = VIK_TRACKPOINT(iter->data); | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | iter = iter->next; | |
1388 | } | |
1389 | ||
1390 | if (!max_speed_tp) | |
1391 | return NULL; | |
1392 | ||
1393 | return max_speed_tp; | |
1394 | } | |
1395 | ||
c28faca8 RN |
1396 | VikTrackpoint* vik_track_get_tp_by_max_alt ( const VikTrack *tr ) |
1397 | { | |
1398 | gdouble maxalt = -5000.0; | |
1399 | if ( !tr->trackpoints ) | |
1400 | return NULL; | |
1401 | ||
1402 | GList *iter = tr->trackpoints; | |
1403 | VikTrackpoint *max_alt_tp = NULL; | |
1404 | ||
1405 | while (iter) { | |
1406 | if ( VIK_TRACKPOINT(iter->data)->altitude > maxalt ) { | |
1407 | maxalt = VIK_TRACKPOINT(iter->data)->altitude; | |
1408 | max_alt_tp = VIK_TRACKPOINT(iter->data); | |
1409 | } | |
1410 | iter = iter->next; | |
1411 | } | |
1412 | ||
1413 | if (!max_alt_tp) | |
1414 | return NULL; | |
1415 | ||
1416 | return max_alt_tp; | |
1417 | } | |
1418 | ||
1419 | VikTrackpoint* vik_track_get_tp_by_min_alt ( const VikTrack *tr ) | |
1420 | { | |
1421 | gdouble minalt = 25000.0; | |
1422 | if ( !tr->trackpoints ) | |
1423 | return NULL; | |
1424 | ||
1425 | GList *iter = tr->trackpoints; | |
1426 | VikTrackpoint *min_alt_tp = NULL; | |
1427 | ||
1428 | while (iter) { | |
1429 | if ( VIK_TRACKPOINT(iter->data)->altitude < minalt ) { | |
1430 | minalt = VIK_TRACKPOINT(iter->data)->altitude; | |
1431 | min_alt_tp = VIK_TRACKPOINT(iter->data); | |
1432 | } | |
1433 | iter = iter->next; | |
1434 | } | |
1435 | ||
1436 | if (!min_alt_tp) | |
1437 | return NULL; | |
1438 | ||
1439 | return min_alt_tp; | |
1440 | } | |
1441 | ||
215ebe59 RN |
1442 | VikTrackpoint *vik_track_get_tp_first( const VikTrack *tr ) |
1443 | { | |
1444 | if ( !tr->trackpoints ) | |
1445 | return NULL; | |
1446 | ||
1447 | return (VikTrackpoint*)g_list_first(tr->trackpoints)->data; | |
1448 | } | |
1449 | ||
1450 | VikTrackpoint *vik_track_get_tp_last ( const VikTrack *tr ) | |
1451 | { | |
1452 | if ( !tr->trackpoints ) | |
1453 | return NULL; | |
1454 | ||
1455 | return (VikTrackpoint*)g_list_last(tr->trackpoints)->data; | |
1456 | } | |
1457 | ||
f41c73bd RN |
1458 | VikTrackpoint *vik_track_get_tp_prev ( const VikTrack *tr, VikTrackpoint *tp ) |
1459 | { | |
1460 | if ( !tr->trackpoints ) | |
1461 | return NULL; | |
1462 | ||
1463 | GList *iter = tr->trackpoints; | |
1464 | VikTrackpoint *tp_prev = NULL; | |
1465 | ||
1466 | while (iter) { | |
1467 | if (iter->prev) { | |
1468 | if ( VIK_TRACKPOINT(iter->data) == tp ) { | |
1469 | tp_prev = VIK_TRACKPOINT(iter->prev->data); | |
1470 | break; | |
1471 | } | |
1472 | } | |
1473 | iter = iter->next; | |
1474 | } | |
1475 | ||
1476 | return tp_prev; | |
1477 | } | |
1478 | ||
b42a25ba EB |
1479 | gboolean vik_track_get_minmax_alt ( const VikTrack *tr, gdouble *min_alt, gdouble *max_alt ) |
1480 | { | |
1481 | *min_alt = 25000; | |
1482 | *max_alt = -5000; | |
1483 | if ( tr && tr->trackpoints && tr->trackpoints->data && (VIK_TRACKPOINT(tr->trackpoints->data)->altitude != VIK_DEFAULT_ALTITUDE) ) { | |
1484 | GList *iter = tr->trackpoints->next; | |
1485 | gdouble tmp_alt; | |
1486 | while (iter) | |
1487 | { | |
1488 | tmp_alt = VIK_TRACKPOINT(iter->data)->altitude; | |
1489 | if ( tmp_alt > *max_alt ) | |
1490 | *max_alt = tmp_alt; | |
1491 | if ( tmp_alt < *min_alt ) | |
1492 | *min_alt = tmp_alt; | |
1493 | iter = iter->next; | |
1494 | } | |
1495 | return TRUE; | |
1496 | } | |
1497 | return FALSE; | |
1498 | } | |
ddc47a46 AF |
1499 | |
1500 | void vik_track_marshall ( VikTrack *tr, guint8 **data, guint *datalen) | |
1501 | { | |
1502 | GList *tps; | |
1503 | GByteArray *b = g_byte_array_new(); | |
1504 | guint len; | |
1505 | guint intp, ntp; | |
1506 | ||
1507 | g_byte_array_append(b, (guint8 *)tr, sizeof(*tr)); | |
1508 | ||
1509 | /* we'll fill out number of trackpoints later */ | |
1510 | intp = b->len; | |
1511 | g_byte_array_append(b, (guint8 *)&len, sizeof(len)); | |
1512 | ||
f629b00b RN |
1513 | // This allocates space for variant sized strings |
1514 | // and copies that amount of data from the track to byte array | |
1515 | #define vtm_append(s) \ | |
1516 | len = (s) ? strlen(s)+1 : 0; \ | |
1517 | g_byte_array_append(b, (guint8 *)&len, sizeof(len)); \ | |
1518 | if (s) g_byte_array_append(b, (guint8 *)s, len); | |
1519 | ||
ddc47a46 AF |
1520 | tps = tr->trackpoints; |
1521 | ntp = 0; | |
1522 | while (tps) { | |
1523 | g_byte_array_append(b, (guint8 *)tps->data, sizeof(VikTrackpoint)); | |
f629b00b | 1524 | vtm_append(VIK_TRACKPOINT(tps->data)->name); |
ddc47a46 AF |
1525 | tps = tps->next; |
1526 | ntp++; | |
1527 | } | |
1528 | *(guint *)(b->data + intp) = ntp; | |
1529 | ||
6b2f262e RN |
1530 | vtm_append(tr->name); |
1531 | vtm_append(tr->comment); | |
1532 | vtm_append(tr->description); | |
be455472 | 1533 | vtm_append(tr->source); |
ddc47a46 AF |
1534 | |
1535 | *data = b->data; | |
1536 | *datalen = b->len; | |
1537 | g_byte_array_free(b, FALSE); | |
1538 | } | |
1539 | ||
6b2f262e RN |
1540 | /* |
1541 | * Take a byte array and convert it into a Track | |
1542 | */ | |
ddc47a46 AF |
1543 | VikTrack *vik_track_unmarshall (guint8 *data, guint datalen) |
1544 | { | |
1545 | guint len; | |
1546 | VikTrack *new_tr = vik_track_new(); | |
1547 | VikTrackpoint *new_tp; | |
1548 | guint ntp; | |
1549 | gint i; | |
1550 | ||
0d2b891f | 1551 | /* basic properties: */ |
ddc47a46 | 1552 | new_tr->visible = ((VikTrack *)data)->visible; |
0d2b891f | 1553 | new_tr->is_route = ((VikTrack *)data)->is_route; |
387ff7ac RN |
1554 | new_tr->draw_name_mode = ((VikTrack *)data)->draw_name_mode; |
1555 | new_tr->max_number_dist_labels = ((VikTrack *)data)->max_number_dist_labels; | |
b1453c16 RN |
1556 | new_tr->has_color = ((VikTrack *)data)->has_color; |
1557 | new_tr->color = ((VikTrack *)data)->color; | |
20981fd6 | 1558 | new_tr->bbox = ((VikTrack *)data)->bbox; |
0d2b891f | 1559 | |
ddc47a46 AF |
1560 | data += sizeof(*new_tr); |
1561 | ||
1562 | ntp = *(guint *)data; | |
1563 | data += sizeof(ntp); | |
1564 | ||
6b2f262e RN |
1565 | #define vtu_get(s) \ |
1566 | len = *(guint *)data; \ | |
1567 | data += sizeof(len); \ | |
1568 | if (len) { \ | |
1569 | (s) = g_strdup((gchar *)data); \ | |
1570 | } else { \ | |
1571 | (s) = NULL; \ | |
1572 | } \ | |
ce4bd1cf RN |
1573 | data += len; |
1574 | ||
f629b00b RN |
1575 | for (i=0; i<ntp; i++) { |
1576 | new_tp = vik_trackpoint_new(); | |
1577 | memcpy(new_tp, data, sizeof(*new_tp)); | |
1578 | data += sizeof(*new_tp); | |
1579 | vtu_get(new_tp->name); | |
1580 | new_tr->trackpoints = g_list_prepend(new_tr->trackpoints, new_tp); | |
1581 | } | |
1582 | if ( new_tr->trackpoints ) | |
1583 | new_tr->trackpoints = g_list_reverse(new_tr->trackpoints); | |
1584 | ||
6b2f262e RN |
1585 | vtu_get(new_tr->name); |
1586 | vtu_get(new_tr->comment); | |
1587 | vtu_get(new_tr->description); | |
be455472 | 1588 | vtu_get(new_tr->source); |
6b2f262e | 1589 | |
ddc47a46 AF |
1590 | return new_tr; |
1591 | } | |
ad0a8c2d | 1592 | |
20981fd6 RN |
1593 | /** |
1594 | * (Re)Calculate the bounds of the given track, | |
1595 | * updating the track's bounds data. | |
1596 | * This should be called whenever a track's trackpoints are changed | |
1597 | */ | |
1598 | void vik_track_calculate_bounds ( VikTrack *trk ) | |
1599 | { | |
1600 | GList *tp_iter; | |
1601 | tp_iter = trk->trackpoints; | |
1602 | ||
1603 | struct LatLon topleft, bottomright, ll; | |
1604 | ||
1605 | // Set bounds to first point | |
1606 | if ( tp_iter ) { | |
1607 | vik_coord_to_latlon ( &(VIK_TRACKPOINT(tp_iter->data)->coord), &topleft ); | |
1608 | vik_coord_to_latlon ( &(VIK_TRACKPOINT(tp_iter->data)->coord), &bottomright ); | |
1609 | } | |
1610 | while ( tp_iter ) { | |
1611 | ||
1612 | // See if this trackpoint increases the track bounds. | |
1613 | ||
1614 | vik_coord_to_latlon ( &(VIK_TRACKPOINT(tp_iter->data)->coord), &ll ); | |
1615 | ||
1616 | if ( ll.lat > topleft.lat) topleft.lat = ll.lat; | |
1617 | if ( ll.lon < topleft.lon) topleft.lon = ll.lon; | |
1618 | if ( ll.lat < bottomright.lat) bottomright.lat = ll.lat; | |
1619 | if ( ll.lon > bottomright.lon) bottomright.lon = ll.lon; | |
1620 | ||
1621 | tp_iter = tp_iter->next; | |
1622 | } | |
1623 | ||
644eea0e | 1624 | g_debug ( "Bounds of track: '%s' is: %f,%f to: %f,%f", trk->name, topleft.lat, topleft.lon, bottomright.lat, bottomright.lon ); |
20981fd6 RN |
1625 | |
1626 | trk->bbox.north = topleft.lat; | |
1627 | trk->bbox.east = bottomright.lon; | |
1628 | trk->bbox.south = bottomright.lat; | |
1629 | trk->bbox.west = topleft.lon; | |
1630 | } | |
1631 | ||
d6218717 RN |
1632 | /** |
1633 | * vik_track_anonymize_times: | |
1634 | * | |
1635 | * Shift all timestamps to be relatively offset from 1901-01-01 | |
1636 | */ | |
1637 | void vik_track_anonymize_times ( VikTrack *tr ) | |
1638 | { | |
1639 | GTimeVal gtv; | |
7cdba4c2 RN |
1640 | // Check result just to please Coverity - even though it shouldn't fail as it's a hard coded value here! |
1641 | if ( !g_time_val_from_iso8601 ( "1901-01-01T00:00:00Z", >v ) ) { | |
1642 | g_critical ( "Calendar time value failure" ); | |
1643 | return; | |
1644 | } | |
d6218717 RN |
1645 | |
1646 | time_t anon_timestamp = gtv.tv_sec; | |
1647 | time_t offset = 0; | |
1648 | ||
1649 | GList *tp_iter; | |
1650 | tp_iter = tr->trackpoints; | |
1651 | while ( tp_iter ) { | |
1652 | VikTrackpoint *tp = VIK_TRACKPOINT(tp_iter->data); | |
1653 | if ( tp->has_timestamp ) { | |
1654 | // Calculate an offset in time using the first available timestamp | |
1655 | if ( offset == 0 ) | |
1656 | offset = tp->timestamp - anon_timestamp; | |
1657 | ||
1658 | // Apply this offset to shift all timestamps towards 1901 & hence anonymising the time | |
1659 | // Note that the relative difference between timestamps is kept - thus calculating speeds will still work | |
1660 | tp->timestamp = tp->timestamp - offset; | |
1661 | } | |
1662 | tp_iter = tp_iter->next; | |
1663 | } | |
1664 | } | |
1665 | ||
087037cc CM |
1666 | /** |
1667 | * vik_track_interpolate_times: | |
1668 | * | |
1669 | * Interpolate the timestamps between first and last trackpoint, | |
1670 | * so that the track is driven at equal speed, regardless of the | |
1671 | * distance between individual trackpoints. | |
1672 | * | |
1673 | * NB This will overwrite any existing trackpoint timestamps | |
1674 | */ | |
1675 | void vik_track_interpolate_times ( VikTrack *tr ) | |
1676 | { | |
1677 | gdouble tr_dist, cur_dist; | |
1678 | time_t tsdiff, tsfirst; | |
1679 | ||
1680 | GList *iter; | |
1681 | iter = tr->trackpoints; | |
1682 | ||
1683 | VikTrackpoint *tp = VIK_TRACKPOINT(iter->data); | |
1684 | if ( tp->has_timestamp ) { | |
1685 | tsfirst = tp->timestamp; | |
1686 | ||
1687 | // Find the end of the track and the last timestamp | |
1688 | while ( iter->next ) { | |
1689 | iter = iter->next; | |
1690 | } | |
1691 | tp = VIK_TRACKPOINT(iter->data); | |
1692 | if ( tp->has_timestamp ) { | |
1693 | tsdiff = tp->timestamp - tsfirst; | |
1694 | ||
1695 | tr_dist = vik_track_get_length_including_gaps ( tr ); | |
1696 | cur_dist = 0.0; | |
1697 | ||
1698 | if ( tr_dist > 0 ) { | |
1699 | iter = tr->trackpoints; | |
1700 | // Apply the calculated timestamp to all trackpoints except the first and last ones | |
1701 | while ( iter->next && iter->next->next ) { | |
1702 | iter = iter->next; | |
1703 | tp = VIK_TRACKPOINT(iter->data); | |
1704 | cur_dist += vik_coord_diff ( &(tp->coord), &(VIK_TRACKPOINT(iter->prev->data)->coord) ); | |
1705 | ||
1706 | tp->timestamp = (cur_dist / tr_dist) * tsdiff + tsfirst; | |
1707 | tp->has_timestamp = TRUE; | |
1708 | } | |
31dd24e9 RN |
1709 | // Some points may now have the same time so remove them. |
1710 | vik_track_remove_same_time_points ( tr ); | |
087037cc CM |
1711 | } |
1712 | } | |
1713 | } | |
1714 | } | |
d6218717 | 1715 | |
20981fd6 | 1716 | /** |
4d333042 RN |
1717 | * vik_track_apply_dem_data: |
1718 | * @skip_existing: When TRUE, don't change the elevation if the trackpoint already has a value | |
20981fd6 | 1719 | * |
4d333042 | 1720 | * Set elevation data for a track using any available DEM information |
20981fd6 | 1721 | */ |
4d333042 | 1722 | gulong vik_track_apply_dem_data ( VikTrack *tr, gboolean skip_existing ) |
ad0a8c2d | 1723 | { |
4d333042 | 1724 | gulong num = 0; |
ad0a8c2d EB |
1725 | GList *tp_iter; |
1726 | gint16 elev; | |
ad0a8c2d EB |
1727 | tp_iter = tr->trackpoints; |
1728 | while ( tp_iter ) { | |
4d333042 RN |
1729 | // Don't apply if the point already has a value and the overwrite is off |
1730 | if ( !(skip_existing && VIK_TRACKPOINT(tp_iter->data)->altitude != VIK_DEFAULT_ALTITUDE) ) { | |
1731 | /* TODO: of the 4 possible choices we have for choosing an elevation | |
1732 | * (trackpoint in between samples), choose the one with the least elevation change | |
1733 | * as the last */ | |
1734 | elev = a_dems_get_elev_by_coord ( &(VIK_TRACKPOINT(tp_iter->data)->coord), VIK_DEM_INTERPOL_BEST ); | |
1735 | ||
1736 | if ( elev != VIK_DEM_INVALID_ELEVATION ) { | |
1737 | VIK_TRACKPOINT(tp_iter->data)->altitude = elev; | |
1738 | num++; | |
1739 | } | |
1740 | } | |
ad0a8c2d EB |
1741 | tp_iter = tp_iter->next; |
1742 | } | |
4d333042 | 1743 | return num; |
ad0a8c2d | 1744 | } |
bddd2056 | 1745 | |
210ef020 GB |
1746 | /** |
1747 | * vik_track_apply_dem_data_last_trackpoint: | |
e85535ea RN |
1748 | * Apply DEM data (if available) - to only the last trackpoint |
1749 | */ | |
1750 | void vik_track_apply_dem_data_last_trackpoint ( VikTrack *tr ) | |
1751 | { | |
1752 | gint16 elev; | |
1753 | if ( tr->trackpoints ) { | |
1754 | /* As in vik_track_apply_dem_data above - use 'best' interpolation method */ | |
1755 | elev = a_dems_get_elev_by_coord ( &(VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->coord), VIK_DEM_INTERPOL_BEST ); | |
1756 | if ( elev != VIK_DEM_INVALID_ELEVATION ) | |
1757 | VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->altitude = elev; | |
1758 | } | |
1759 | } | |
1760 | ||
024f0e93 RN |
1761 | |
1762 | /** | |
1763 | * smoothie: | |
1764 | * | |
1765 | * Apply elevation smoothing over range of trackpoints between the list start and end points | |
1766 | */ | |
1767 | static void smoothie ( GList *tp1, GList *tp2, gdouble elev1, gdouble elev2, guint points ) | |
1768 | { | |
1769 | // If was really clever could try and weigh interpolation according to the distance between trackpoints somehow | |
1770 | // Instead a simple average interpolation for the number of points given. | |
1771 | gdouble change = (elev2 - elev1)/(points+1); | |
1772 | gint count = 1; | |
1773 | GList *tp_iter = tp1; | |
1774 | while ( tp_iter != tp2 && tp_iter ) { | |
1775 | VikTrackpoint *tp = VIK_TRACKPOINT(tp_iter->data); | |
1776 | ||
1777 | tp->altitude = elev1 + (change*count); | |
1778 | ||
1779 | count++; | |
1780 | tp_iter = tp_iter->next; | |
1781 | } | |
1782 | } | |
1783 | ||
1784 | /** | |
1785 | * vik_track_smooth_missing_elevation_data: | |
81ac2835 | 1786 | * @flat: Specify how the missing elevations will be set. |
024f0e93 RN |
1787 | * When TRUE it uses a simple flat method, using the last known elevation |
1788 | * When FALSE is uses an interpolation method to the next known elevation | |
1789 | * | |
1790 | * For each point with a missing elevation, set it to use the last known available elevation value. | |
1791 | * Primarily of use for smallish DEM holes where it is missing elevation data. | |
1792 | * Eg see Austria: around N47.3 & E13.8 | |
1793 | * | |
1794 | * Returns: The number of points that were adjusted | |
1795 | */ | |
1796 | gulong vik_track_smooth_missing_elevation_data ( VikTrack *tr, gboolean flat ) | |
1797 | { | |
1798 | gulong num = 0; | |
1799 | ||
1800 | GList *tp_iter; | |
1801 | gdouble elev = VIK_DEFAULT_ALTITUDE; | |
1802 | ||
1803 | VikTrackpoint *tp_missing = NULL; | |
1804 | GList *iter_first = NULL; | |
1805 | guint points = 0; | |
1806 | ||
1807 | tp_iter = tr->trackpoints; | |
1808 | while ( tp_iter ) { | |
1809 | VikTrackpoint *tp = VIK_TRACKPOINT(tp_iter->data); | |
1810 | ||
1811 | if ( VIK_DEFAULT_ALTITUDE == tp->altitude ) { | |
1812 | if ( flat ) { | |
1813 | // Simply assign to last known value | |
1814 | if ( elev != VIK_DEFAULT_ALTITUDE ) { | |
1815 | tp->altitude = elev; | |
1816 | num++; | |
1817 | } | |
1818 | } | |
1819 | else { | |
1820 | if ( !tp_missing ) { | |
1821 | // Remember the first trackpoint (and the list pointer to it) of a section of no altitudes | |
1822 | tp_missing = tp; | |
1823 | iter_first = tp_iter; | |
1824 | points = 1; | |
1825 | } | |
1826 | else { | |
1827 | // More missing altitudes | |
1828 | points++; | |
1829 | } | |
1830 | } | |
1831 | } | |
1832 | else { | |
1833 | // Altitude available (maybe again!) | |
1834 | // If this marks the end of a section of altitude-less points | |
1835 | // then apply smoothing for that section of points | |
1836 | if ( points > 0 && elev != VIK_DEFAULT_ALTITUDE ) | |
1837 | if ( !flat ) { | |
1838 | smoothie ( iter_first, tp_iter, elev, tp->altitude, points ); | |
1839 | num = num + points; | |
1840 | } | |
1841 | ||
1842 | // reset | |
1843 | points = 0; | |
1844 | tp_missing = NULL; | |
1845 | ||
1846 | // Store for reuse as the last known good value | |
1847 | elev = tp->altitude; | |
1848 | } | |
1849 | ||
1850 | tp_iter = tp_iter->next; | |
1851 | } | |
1852 | ||
1853 | return num; | |
1854 | } | |
1855 | ||
210ef020 GB |
1856 | /** |
1857 | * vik_track_steal_and_append_trackpoints: | |
1858 | * | |
1859 | * appends t2 to t1, leaving t2 with no trackpoints | |
1860 | */ | |
bddd2056 EB |
1861 | void vik_track_steal_and_append_trackpoints ( VikTrack *t1, VikTrack *t2 ) |
1862 | { | |
1863 | if ( t1->trackpoints ) { | |
78af4063 | 1864 | t1->trackpoints = g_list_concat ( t1->trackpoints, t2->trackpoints ); |
bddd2056 EB |
1865 | } else |
1866 | t1->trackpoints = t2->trackpoints; | |
1867 | t2->trackpoints = NULL; | |
20981fd6 RN |
1868 | |
1869 | // Trackpoints updated - so update the bounds | |
1870 | vik_track_calculate_bounds ( t1 ); | |
bddd2056 | 1871 | } |
c3deba01 | 1872 | |
210ef020 GB |
1873 | /** |
1874 | * vik_track_cut_back_to_double_point: | |
1875 | * | |
1876 | * starting at the end, looks backwards for the last "double point", a duplicate trackpoint. | |
7ff7d728 | 1877 | * If there is no double point, deletes all the trackpoints. |
210ef020 GB |
1878 | * |
1879 | * Returns: the new end of the track (or the start if there are no double points) | |
c3deba01 EB |
1880 | */ |
1881 | VikCoord *vik_track_cut_back_to_double_point ( VikTrack *tr ) | |
1882 | { | |
1883 | GList *iter = tr->trackpoints; | |
1884 | VikCoord *rv; | |
1885 | ||
1886 | if ( !iter ) | |
1887 | return NULL; | |
1888 | while ( iter->next ) | |
1889 | iter = iter->next; | |
1890 | ||
1891 | ||
1892 | while ( iter->prev ) { | |
129c0ff2 MH |
1893 | VikCoord *cur_coord = &((VikTrackpoint*)iter->data)->coord; |
1894 | VikCoord *prev_coord = &((VikTrackpoint*)iter->prev->data)->coord; | |
1895 | if ( vik_coord_equals(cur_coord, prev_coord) ) { | |
c3deba01 EB |
1896 | GList *prev = iter->prev; |
1897 | ||
1898 | rv = g_malloc(sizeof(VikCoord)); | |
129c0ff2 | 1899 | *rv = *cur_coord; |
c3deba01 EB |
1900 | |
1901 | /* truncate trackpoint list */ | |
1902 | iter->prev = NULL; /* pretend it's the end */ | |
1903 | g_list_foreach ( iter, (GFunc) g_free, NULL ); | |
1904 | g_list_free( iter ); | |
1905 | ||
1906 | prev->next = NULL; | |
1907 | ||
1908 | return rv; | |
1909 | } | |
1910 | iter = iter->prev; | |
1911 | } | |
1912 | ||
1913 | /* no double point found! */ | |
1914 | rv = g_malloc(sizeof(VikCoord)); | |
129c0ff2 | 1915 | *rv = ((VikTrackpoint*) tr->trackpoints->data)->coord; |
c3deba01 EB |
1916 | g_list_foreach ( tr->trackpoints, (GFunc) g_free, NULL ); |
1917 | g_list_free( tr->trackpoints ); | |
1918 | tr->trackpoints = NULL; | |
1919 | return rv; | |
1920 | } | |
1921 | ||
5c97b8a7 RN |
1922 | /** |
1923 | * Function to compare two tracks by their first timestamp | |
1924 | **/ | |
1925 | int vik_track_compare_timestamp (const void *x, const void *y) | |
1926 | { | |
1927 | VikTrack *a = (VikTrack *)x; | |
1928 | VikTrack *b = (VikTrack *)y; | |
1929 | ||
1930 | VikTrackpoint *tpa = NULL; | |
1931 | VikTrackpoint *tpb = NULL; | |
1932 | ||
1933 | if ( a->trackpoints ) | |
1934 | tpa = VIK_TRACKPOINT(g_list_first(a->trackpoints)->data); | |
1935 | ||
1936 | if ( b->trackpoints ) | |
1937 | tpb = VIK_TRACKPOINT(g_list_first(b->trackpoints)->data); | |
1938 | ||
1939 | if ( tpa && tpb ) { | |
1940 | if ( tpa->timestamp < tpb->timestamp ) | |
1941 | return -1; | |
1942 | if ( tpa->timestamp > tpb->timestamp ) | |
1943 | return 1; | |
1944 | } | |
1945 | ||
1946 | if ( tpa && !tpb ) | |
1947 | return 1; | |
1948 | ||
1949 | if ( !tpa && tpb ) | |
1950 | return -1; | |
1951 | ||
1952 | return 0; | |
1953 | } |