Contents of /trunk/src/geomath.c

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Revision 212 - (show annotations)
Wed Nov 25 13:52:17 2009 UTC (14 years, 6 months ago) by harbaum
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Coordinate popup
1 /*
2 * Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
3 *
4 * This file is part of GPXView.
5 *
6 * GPXView is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * GPXView is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with GPXView. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "gpxview.h"
21 #include <math.h>
22
23 #if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR >= 5)
24 #include <hildon/hildon-entry.h>
25 #endif
26
27 #define STR_NAN "----"
28
29 typedef struct {
30 appdata_t *appdata;
31
32 GtkWidget *lon1, *lat1, *dist1, *dir1;
33 GtkWidget *lon2, *lat2;
34
35 GtkWidget *distance, *proj_lat, *proj_lon;
36 GtkWidget *middle_lat, *middle_lon;
37 } math_dialog_state_t;
38
39 static gboolean mark(GtkWidget *widget, gboolean valid) {
40 gtk_widget_set_state(widget, valid?GTK_STATE_NORMAL:TAG_STATE);
41 return valid;
42 }
43
44 /* a entry that is colored red when being "active" */
45 static GtkWidget *gtk_red_entry_new(void) {
46 GdkColor color;
47 GtkWidget *widget = entry_new();
48 gdk_color_parse("#ff0000", &color);
49 gtk_widget_modify_text(widget, TAG_STATE, &color);
50 return widget;
51 }
52
53 /* a comboboxentry that is colored red when being "active" */
54 static GtkWidget *gtk_red_combo_box_entry_new_text(void) {
55 GdkColor color;
56 GtkWidget *widget = gtk_combo_box_entry_new_text();
57 gdk_color_parse("#ff0000", &color);
58 gtk_widget_modify_text(GTK_BIN(widget)->child, TAG_STATE, &color);
59 return widget;
60 }
61
62 /* a label that is colored red when being "active" */
63 static GtkWidget *gtk_red_label_new(char *str) {
64 GdkColor color;
65 GtkWidget *widget = left_label_new(str);
66 gdk_color_parse("#ff0000", &color);
67 gtk_widget_modify_fg(widget, TAG_STATE, &color);
68 return widget;
69 }
70
71 static GtkWidget *gtk_dir_entry_new(float val) {
72 char str[16];
73 GtkWidget *w = gtk_red_entry_new();
74
75 snprintf(str, sizeof(str), _("%.1f°"), val);
76 gtk_entry_set_text(GTK_ENTRY(w), str);
77
78 return w;
79 }
80
81 float pos_lat_eval_combo(GtkWidget *widget) {
82 char *p = (char*)gtk_combo_box_get_active_text(GTK_COMBO_BOX(widget));
83 float val = pos_parse_lat(p);
84 mark(widget, !isnan(val));
85
86 return val;
87 }
88
89 static float distance_eval(GtkWidget *widget, math_dialog_state_t *state) {
90 char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
91 float val = distance_parse(p, state->appdata->imperial);
92 mark(widget, !isnan(val));
93
94 return val;
95 }
96
97 float direction_eval(GtkWidget *widget) {
98 char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
99 float val;
100 if(sscanf(p, _("%f°"), &val) != 1)
101 val = NAN;
102
103 mark(widget, !isnan(val));
104
105 return val;
106 }
107
108 static void on_calc_clicked(GtkButton *button, gpointer user_data) {
109 math_dialog_state_t *state = (math_dialog_state_t*)user_data;
110 pos_t pos1, pos2;
111 gboolean pos1_ok = FALSE, pos2_ok = FALSE;
112 float dist1;
113 gboolean dist1_ok = FALSE;
114 float dir1;
115 gboolean dir1_ok = FALSE;
116
117 /* parse input */
118 pos1.lat = lat_get(state->lat1);
119 pos1.lon = lon_get(state->lon1);
120 if(!isnan(pos1.lat) && !isnan(pos1.lon)) pos1_ok = TRUE;
121
122 pos2.lat = lat_get(state->lat2);
123 pos2.lon = lon_get(state->lon2);
124 if(!isnan(pos2.lat) && !isnan(pos2.lon)) pos2_ok = TRUE;
125
126 dist1 = distance_eval(state->dist1, state);
127 if(!isnan(dist1)) dist1_ok = TRUE;
128
129 dir1 = direction_eval(state->dir1);
130 if(!isnan(dir1)) dir1_ok = TRUE;
131
132 /* ------------------- do all calculations ------------------- */
133
134
135 /* ------------------- distance of coo1 and coo2 ------------------- */
136 if(mark(state->distance, pos1_ok && pos2_ok)) {
137 char str[32];
138 float dist = gpx_pos_get_distance(pos1, pos2, state->appdata->imperial);
139 distance_str(str, sizeof(str), dist, state->appdata->imperial);
140
141 gtk_label_set_text(GTK_LABEL(state->distance), str);
142 } else
143 gtk_label_set_text(GTK_LABEL(state->distance), STR_NAN);
144
145 // N 53° 09.033' W 001° 50.666' 100km / 30° = N 53° 55.616, W001° 04.850
146 /* ------------------- coordinate projection ---------------- */
147 mark(state->proj_lat, pos1_ok && dist1_ok && dir1_ok);
148 if(mark(state->proj_lon, pos1_ok && dist1_ok && dir1_ok)) {
149 pos_t pro;
150
151 /* get great circle radius in miles/kilometers */
152 float gcrad = state->appdata->imperial?3959.0:6371.0;
153
154 // from: http://www.movable-type.co.uk/scripts/latlong.html
155 pro.lat = asin(sin(pos1.lat/180*M_PI) * cos(dist1/gcrad) +
156 cos(pos1.lat/180*M_PI) * sin(dist1/gcrad) *
157 cos(dir1/180*M_PI) )/M_PI*180;
158 pro.lon = pos1.lon + atan2(sin(dir1/180*M_PI)*sin(dist1/gcrad)*
159 cos(pos1.lat/180*M_PI),
160 cos(dist1/gcrad)-sin(pos1.lat/180*M_PI)*
161 sin(pro.lat/180*M_PI))/M_PI*180;
162 pro.lon = fmodf(pro.lon+180,360) - 180; // normalise to -180...+180
163
164 char str[16];
165 pos_lat_str(str, sizeof(str), pro.lat);
166 gtk_label_set_text(GTK_LABEL(state->proj_lat), str);
167 pos_lon_str(str, sizeof(str), pro.lon);
168 gtk_label_set_text(GTK_LABEL(state->proj_lon), str);
169
170 if(!isnan(pro.lat) && !isnan(pro.lon))
171 state->appdata->geomath = pro;
172 } else {
173 gtk_label_set_text(GTK_LABEL(state->proj_lat), STR_NAN);
174 gtk_label_set_text(GTK_LABEL(state->proj_lon), STR_NAN);
175 }
176
177 #if 0
178 /* ------------ middle between both points ------------- */
179 mark(state->middle_lat, pos1_ok && pos2_ok);
180 if(mark(state->middle_lon, pos1_ok && pos2_ok)) {
181 pos_t res;
182
183 float dlon = fabs(pos2.lon - pos1.lon)/180*M_PI;
184
185 /* http://mathforum.org/library/drmath/view/51822.html */
186 res.lon = 180/M_PI * atan(cos(pos2.lat/180*M_PI)*sin(pos2.lon/180*M_PI)/
187 (cos(pos1.lat/180*M_PI)+cos(pos2.lat/180*M_PI)*cos(pos2.lon/180*M_PI)));
188 res.lat = 180/M_PI * atan((sin(pos1.lat/180*M_PI)+sin(pos2.lat/180*M_PI))/
189 sqrt(pow(cos(pos2.lat/180*M_PI)+cos(pos2.lat/180*M_PI)*cos(dlon),2)+
190 pow(cos(pos2.lat/180*M_PI)*sin(dlon),2)));
191
192 char str1[32], str2[32];
193 pos_lat_str(str1,sizeof(str1),res.lat);
194 pos_lon_str(str2,sizeof(str2),res.lon);
195 printf("pos = %s/%s\n", str1, str2);
196 } else {
197 gtk_label_set_text(GTK_LABEL(state->middle_lat), STR_NAN);
198 gtk_label_set_text(GTK_LABEL(state->middle_lon), STR_NAN);
199 }
200 #endif
201 }
202
203 static gint waypoint_changed_event(GtkWidget *widget, gpointer data ) {
204 math_dialog_state_t *state = (math_dialog_state_t*)data;
205 int wpt_idx = gtk_combo_box_get_active(GTK_COMBO_BOX(widget));
206 pos_t *pos = NULL;
207
208 if(wpt_idx < 0)
209 return FALSE;
210
211 if(wpt_idx == 0)
212 pos = gps_get_pos(state->appdata);
213 else if(wpt_idx == 1) {
214 #ifdef ENABLE_OSM_GPS_MAP
215 if(!isnan(state->appdata->map.pos.lat) &&
216 !isnan(state->appdata->map.pos.lon))
217 pos = &state->appdata->map.pos;
218 #endif
219 } else if(wpt_idx == 2) {
220 pos_t cache_pos = gpx_cache_pos(state->appdata->cur_cache);
221 pos = &cache_pos;
222 } else {
223 wpt_t *wpt = state->appdata->cur_cache->wpt;
224 while(wpt_idx > 3) {
225 g_assert(wpt != NULL);
226 wpt = wpt->next;
227 wpt_idx--;
228 }
229 pos = &wpt->pos;
230 }
231
232 if(pos) {
233 char str[32];
234 pos_lat_str(str,sizeof(str),pos->lat);
235 gtk_entry_set_text(GTK_ENTRY(state->lat1), str);
236 pos_lon_str(str,sizeof(str),pos->lon);
237 gtk_entry_set_text(GTK_ENTRY(state->lon1), str);
238 } else {
239 gtk_entry_set_text(GTK_ENTRY(state->lat1), STR_NAN);
240 gtk_entry_set_text(GTK_ENTRY(state->lon1), STR_NAN);
241 }
242
243 mark(state->lat1, pos != NULL);
244 mark(state->lon1, pos != NULL);
245
246 return FALSE;
247 }
248
249 static void callback_modified_lat(GtkWidget *widget, gpointer data ) {
250 float i = pos_parse_lat((char*)gtk_entry_get_text(GTK_ENTRY(widget)));
251 mark(widget, !isnan(i));
252 }
253
254 void geomath_dialog(appdata_t *appdata) {
255 static pos_t pos1 = { 0.0, 0.0 }, pos2 = { 0.0, 0.0 };
256 static float dist1 = 0.0;
257 static float dir1 = 0.0;
258 static gboolean is_imperial = FALSE;
259
260 math_dialog_state_t state;
261 char str[32];
262
263 /* this is quite ugly. It would be nice to run the entire system on */
264 /* one specific system (e.g. metric) and only convert for in- and output */
265 if(!appdata->imperial && is_imperial)
266 dist1 *= 6371.0/3959.0; /* we just switched to metric */
267 if(appdata->imperial && !is_imperial)
268 dist1 *= 3959.0/6371.0; /* we just switched to imperial */
269 is_imperial = appdata->imperial;
270
271 state.appdata = appdata;
272
273 #ifdef USE_MAEMO
274 if(appdata->cur_cache)
275 printf("current cache is %s\n", appdata->cur_cache->id);
276 else
277 printf("no current cache\n");
278 #endif
279
280 GtkWidget *dialog = gtk_dialog_new_with_buttons(_("Geomath"),
281 GTK_WINDOW(appdata->window),
282 // GTK_DIALOG_NO_SEPARATOR |
283 GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
284 GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE,
285 NULL);
286
287 #if defined(USE_MAEMO) && defined(HILDON_HELP)
288 hildon_help_dialog_help_enable(GTK_DIALOG(dialog), HELP_ID_GEOMATH,
289 appdata->osso_context);
290 #endif
291
292 gtk_window_set_default_size(GTK_WINDOW(dialog), DIALOG_WIDTH, DIALOG_HEIGHT);
293
294 /* do geomath dialog */
295 GtkWidget *hbox = gtk_hbox_new(FALSE, 0);
296
297 /* ------------------------- input area ------------------------- */
298 GtkWidget *table = gtk_table_new(5, 3, FALSE);
299 gtk_table_set_col_spacing(GTK_TABLE(table), 1, 20);
300
301 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 1")), 1, 2, 0, 1);
302 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 2")), 2, 3, 0, 1);
303 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Latitude:")), 0, 1, 1, 2);
304
305 GtkWidget *cbox = gtk_red_combo_box_entry_new_text();
306 gtk_combo_box_append_text(GTK_COMBO_BOX(cbox), _("GPS"));
307 gtk_combo_box_append_text(GTK_COMBO_BOX(cbox), _("Map"));
308
309 if(appdata->cur_cache) {
310 gtk_combo_box_append_text(GTK_COMBO_BOX(cbox), appdata->cur_cache->id);
311 wpt_t *wpt = appdata->cur_cache->wpt;
312 while(wpt) {
313 gtk_combo_box_append_text(GTK_COMBO_BOX(cbox), wpt->id);
314 wpt = wpt->next;
315 }
316 }
317
318 state.lat1 = GTK_BIN(cbox)->child;
319 g_signal_connect(G_OBJECT(state.lat1), "changed",
320 G_CALLBACK(callback_modified_lat), NULL);
321 pos_lat_str(str, sizeof(str), pos1.lat);
322 gtk_entry_set_text(GTK_ENTRY(state.lat1), str);
323
324 gtk_signal_connect(GTK_OBJECT(cbox), "changed",
325 (GtkSignalFunc)waypoint_changed_event, &state);
326 gtk_table_attach_defaults(GTK_TABLE(table), cbox, 1,2,1,2);
327
328
329 gtk_table_attach_defaults(GTK_TABLE(table), state.lat2 = lat_entry_new(pos2.lat), 2, 3, 1, 2);
330 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Longitude:")), 0, 1, 2, 3);
331 gtk_table_attach_defaults(GTK_TABLE(table), state.lon1 = lon_entry_new(pos1.lon), 1, 2, 2, 3);
332 gtk_table_attach_defaults(GTK_TABLE(table), state.lon2 = lon_entry_new(pos2.lon), 2, 3, 2, 3);
333 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance:")), 0, 1, 3, 4);
334 gtk_table_attach_defaults(GTK_TABLE(table), state.dist1 = dist_entry_new(dist1, appdata->imperial), 1, 2, 3, 4);
335 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Direction:")), 0, 1, 4, 5);
336 gtk_table_attach_defaults(GTK_TABLE(table), state.dir1 = gtk_dir_entry_new(dir1), 1, 2, 4, 5);
337
338 gtk_box_pack_start(GTK_BOX(hbox), table, TRUE, TRUE, 0);
339
340 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, TRUE, 0);
341
342 /* ------------------------- do-it-button ------------------------- */
343
344 GtkWidget *button = gtk_button_new_with_label(_("Calculate!"));
345 g_signal_connect(button, "clicked", (GCallback)on_calc_clicked, &state);
346
347 #if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR == 5)
348 hildon_gtk_widget_set_theme_size(button,
349 (HILDON_SIZE_FINGER_HEIGHT | HILDON_SIZE_AUTO_WIDTH));
350 gtk_table_attach(GTK_TABLE(table), button, 2,3,3,5, GTK_EXPAND, GTK_EXPAND, 0, 0);
351 #else
352 /* in non-maemo5 the button has its own row */
353 hbox = gtk_hbox_new(FALSE, 0);
354 gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, FALSE, 0);
355 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, FALSE, 0);
356 #endif
357
358 /* ------------------------- output area ------------------------- */
359
360 table = gtk_table_new(3, 3, FALSE);
361
362 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance = ")),
363 0, 1, 0, 1);
364 gtk_table_attach_defaults(GTK_TABLE(table), state.distance = gtk_red_label_new(STR_NAN),
365 1, 3, 0, 1);
366
367 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Projection = ")),
368 0, 1, 1, 2);
369 gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lat = gtk_red_label_new(STR_NAN),
370 1, 2, 1, 2);
371 gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lon = gtk_red_label_new(STR_NAN),
372 2, 3, 1, 2);
373 #if 0
374 gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Middle = ")),
375 0, 1, 2, 3);
376 gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lat = gtk_red_label_new(STR_NAN),
377 1, 2, 2, 3);
378 gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lon = gtk_red_label_new(STR_NAN),
379 2, 3, 2, 3);
380 #endif
381
382 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), table, TRUE, TRUE, 0);
383
384
385 gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_CLOSE);
386
387 gtk_widget_show_all(dialog);
388 gtk_dialog_run(GTK_DIALOG(dialog));
389
390 /* copy values back to local static variables so they re-appear if */
391 /* the dialog is re-opened, convert illegal values (NAN) to 0 */
392
393 pos1.lat = lat_get(state.lat1); if(isnan(pos1.lat)) pos1.lat=0;
394 pos1.lon = lon_get(state.lon1); if(isnan(pos1.lon)) pos1.lon=0;
395 pos2.lat = lat_get(state.lat2); if(isnan(pos2.lat)) pos2.lat=0;
396 pos2.lon = lon_get(state.lon2); if(isnan(pos2.lon)) pos2.lon=0;
397 dist1 = distance_eval(state.dist1, &state); if(isnan(dist1)) dist1=0;
398 dir1 = direction_eval(state.dir1); if(isnan(dir1)) dir1=0;
399
400 gtk_widget_destroy(dialog);
401 }