src/vikgpslayer.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include <stdlib.h>
  23 #include <math.h>
  24 #include "viking.h"
  25 #include "vikgpslayer_pixmap.h"
  26 #include "babel.h"
  27
  28 #include <string.h>
  29 #include <glib.h>
  30 #include <glib/gprintf.h>
  31 #include <gps.h>
  32
  33 #define DISCONNECT_UPDATE_SIGNAL(vl, val) g_signal_handlers_disconnect_matched(vl, G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, val)
  34 static VikGpsLayer *vik_gps_layer_create (VikViewport *vp);
  35 static void vik_gps_layer_realize ( VikGpsLayer *val, VikTreeview *vt, GtkTreeIter *layer_iter );
  36 static void vik_gps_layer_free ( VikGpsLayer *val );
  37 static void vik_gps_layer_draw ( VikGpsLayer *val, gpointer data );
  38 VikGpsLayer *vik_gps_layer_new ();
  39
  40 static void gps_layer_marshall( VikGpsLayer *val, guint8 **data, gint *len );
  41 static VikGpsLayer *gps_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp );
  42 static gboolean gps_layer_set_param ( VikGpsLayer *vgl, guint16 id, VikLayerParamData data, VikViewport *vp );
  43 static VikLayerParamData gps_layer_get_param ( VikGpsLayer *vgl, guint16 id );
  44
  45 static void gps_layer_change_coord_mode ( VikGpsLayer *val, VikCoordMode mode );
  46 static void gps_layer_add_menu_items( VikGpsLayer *vtl, GtkMenu *menu, gpointer vlp );
  47 static void gps_layer_drag_drop_request ( VikGpsLayer *val_src, VikGpsLayer *val_dest, GtkTreeIter *src_item_iter, GtkTreePath *dest_path );
  48
  49 static void realtime_tracking_draw(VikGpsLayer *vgl, VikViewport *vp);
  50
  51 static void gps_upload_cb( gpointer layer_and_vlp[2] );
  52 static void gps_download_cb( gpointer layer_and_vlp[2] );
  53 static void gps_empty_upload_cb( gpointer layer_and_vlp[2] );
  54 static void gps_empty_download_cb( gpointer layer_and_vlp[2] );
  55 static void gps_empty_all_cb( gpointer layer_and_vlp[2] );
  56 static void gps_start_stop_tracking_cb( gpointer layer_and_vlp[2] );
  57
  58 typedef enum {GARMIN_P = 0, MAGELLAN_P, NUM_PROTOCOLS} vik_gps_proto;
  59 static gchar * params_protocols[] = {"Garmin", "Magellan", NULL};
  60 static gchar * protocols_args[]   = {"garmin", "magellan"};
  61 /*#define NUM_PROTOCOLS (sizeof(params_protocols)/sizeof(params_protocols[0]) - 1) */
  62 static gchar * params_ports[] = {"/dev/ttyS0", "/dev/ttyS1", "/dev/ttyUSB0", "/dev/ttyUSB1", "usb:", NULL};
  63 #define NUM_PORTS (sizeof(params_ports)/sizeof(params_ports[0]) - 1)
  64 typedef enum {GPS_DOWN=0, GPS_UP} gps_dir;
  65
  66 typedef struct {
  67   GMutex *mutex;
  68   gps_dir direction;
  69   gchar *port;
  70   gboolean ok;
  71   gint total_count;
  72   gint count;
  73   VikTrwLayer *vtl;
  74   gchar *cmd_args;
  75   gchar * window_title;
  76   GtkWidget *dialog;
  77   GtkWidget *status_label;
  78   GtkWidget *gps_label;
  79   GtkWidget *ver_label;
  80   GtkWidget *id_label;
  81   GtkWidget *wp_label;
  82   GtkWidget *progress_label;
  83   GtkWidget *trk_label;
  84 } GpsSession;
  85 static void gps_session_delete(GpsSession *sess);
  86
  87 static gchar *params_groups[] = {"Data Mode", "Realtime Tracking Mode"};
  88 enum {GROUP_DATA_MODE, GROUP_REALTIME_MODE};
  89
  90 static VikLayerParam gps_layer_params[] = {
  91   { "gps_protocol", VIK_LAYER_PARAM_UINT, GROUP_DATA_MODE, "GPS Protocol:", VIK_LAYER_WIDGET_COMBOBOX, params_protocols, NULL},
  92   { "gps_port", VIK_LAYER_PARAM_UINT, GROUP_DATA_MODE, "Serial Port:", VIK_LAYER_WIDGET_COMBOBOX, params_ports, NULL},
  93
  94   { "record_tracking", VIK_LAYER_PARAM_BOOLEAN, GROUP_REALTIME_MODE, "Recording tracks", VIK_LAYER_WIDGET_CHECKBUTTON},
  95   { "center_start_tracking", VIK_LAYER_PARAM_BOOLEAN, GROUP_REALTIME_MODE, "Jump to current position on start", VIK_LAYER_WIDGET_CHECKBUTTON},
  96   { "centered_tracking", VIK_LAYER_PARAM_BOOLEAN, GROUP_REALTIME_MODE, "Keep current position at center", VIK_LAYER_WIDGET_CHECKBUTTON},
  97   { "gpsd_host", VIK_LAYER_PARAM_STRING, GROUP_REALTIME_MODE, "Gpsd Host:", VIK_LAYER_WIDGET_ENTRY},
  98   { "gpsd_port", VIK_LAYER_PARAM_STRING, GROUP_REALTIME_MODE, "Gpsd Port:", VIK_LAYER_WIDGET_ENTRY},
  99 };
 100 enum {PARAM_PROTOCOL=0, PARAM_PORT, PARAM_REALTIME_REC, PARAM_REALTIME_CENTER_START, PARAM_REALTIME_CENTERED, PARAM_GPSD_HOST, PARAM_GPSD_PORT, NUM_PARAMS};
 101
 102 VikLayerInterface vik_gps_layer_interface = {
 103   "GPS",
 104   &gpslayer_pixbuf,
 105
 106   NULL,
 107   0,
 108
 109   gps_layer_params,
 110   NUM_PARAMS,
 111   params_groups,
 112   sizeof(params_groups)/sizeof(params_groups[0]),
 113
 114   VIK_MENU_ITEM_ALL & ~(VIK_MENU_ITEM_CUT|VIK_MENU_ITEM_COPY),
 115
 116   (VikLayerFuncCreate)                  vik_gps_layer_create,
 117   (VikLayerFuncRealize)                 vik_gps_layer_realize,
 118   (VikLayerFuncPostRead)                NULL,
 119   (VikLayerFuncFree)                    vik_gps_layer_free,
 120
 121   (VikLayerFuncProperties)              NULL,
 122   (VikLayerFuncDraw)                    vik_gps_layer_draw,
 123   (VikLayerFuncChangeCoordMode)         gps_layer_change_coord_mode,
 124
 125   (VikLayerFuncSetMenuItemsSelection)   NULL,
 126   (VikLayerFuncGetMenuItemsSelection)   NULL,
 127
 128   (VikLayerFuncAddMenuItems)            gps_layer_add_menu_items,
 129   (VikLayerFuncSublayerAddMenuItems)    NULL,
 130
 131   (VikLayerFuncSublayerRenameRequest)   NULL,
 132   (VikLayerFuncSublayerToggleVisible)   NULL,
 133
 134   (VikLayerFuncMarshall)                gps_layer_marshall,
 135   (VikLayerFuncUnmarshall)              gps_layer_unmarshall,
 136
 137   (VikLayerFuncSetParam)                gps_layer_set_param,
 138   (VikLayerFuncGetParam)                gps_layer_get_param,
 139
 140   (VikLayerFuncReadFileData)            NULL,
 141   (VikLayerFuncWriteFileData)           NULL,
 142
 143   (VikLayerFuncDeleteItem)              NULL,
 144   (VikLayerFuncCopyItem)                NULL,
 145   (VikLayerFuncPasteItem)               NULL,
 146   (VikLayerFuncFreeCopiedItem)          NULL,
 147   (VikLayerFuncDragDropRequest)         gps_layer_drag_drop_request,
 148 };
 149
 150 enum {TRW_DOWNLOAD=0, TRW_UPLOAD, TRW_REALTIME, NUM_TRW};
 151 static gchar * trw_names[] = {"GPS Download", "GPS Upload", "GPS Realtime Tracking"};
 152
 153 typedef struct {
 154   struct gps_data_t gpsd;
 155   VikGpsLayer *vgl;
 156 } VglGpsd;
 157
 158 typedef struct {
 159   struct gps_fix_t fix;
 160   gboolean dirty;   /* needs to be saved */
 161 } GpsFix;
 162
 163 struct _VikGpsLayer {
 164   VikLayer vl;
 165   VikTrwLayer * trw_children[NUM_TRW];
 166   GList * children;     /* used only for writing file */
 167   int cur_read_child;   /* used only for reading file */
 168   VglGpsd *vgpsd;
 169   gboolean realtime_tracking;
 170   GMutex *realtime_tracking_mutex;
 171   GpsFix realtime_fix;
 172   GpsFix last_fix;
 173
 174   enum unit realtime_gpsd_unit;
 175
 176   VikTrack *realtime_track;
 177   gchar *realtime_track_name;
 178
 179   GIOChannel *realtime_io_channel;
 180   guint realtime_io_watch_id;
 181   GdkGC *realtime_track_gc;
 182   GdkGC *realtime_track_bg_gc;
 183   GdkGC *realtime_track_pt_gc;
 184   GdkGC *realtime_track_pt1_gc;
 185   GdkGC *realtime_track_pt2_gc;
 186
 187   /* params */
 188   guint protocol_id;
 189   guint serial_port_id;
 190   /* TODO: show on diaglog */
 191   gchar *gpsd_host;
 192   gchar *gpsd_port;
 193   gboolean realtime_record;
 194   gboolean realtime_jump_to_start;
 195   gboolean realtime_keep_at_center;
 196 };
 197
 198 GType vik_gps_layer_get_type ()
 199 {
 200   static GType val_type = 0;
 201
 202   if (!val_type)
 203   {
 204     static const GTypeInfo val_info =
 205     {
 206       sizeof (VikGpsLayerClass),
 207       NULL, /* base_init */
 208       NULL, /* base_finalize */
 209       NULL, /* class init */
 210       NULL, /* class_finalize */
 211       NULL, /* class_data */
 212       sizeof (VikGpsLayer),
 213       0,
 214       NULL /* instance init */
 215     };
 216     val_type = g_type_register_static ( VIK_LAYER_TYPE, "VikGpsLayer", &val_info, 0 );
 217   }
 218
 219   return val_type;
 220 }
 221
 222 static VikGpsLayer *vik_gps_layer_create (VikViewport *vp)
 223 {
 224   int i;
 225
 226   VikGpsLayer *rv = vik_gps_layer_new (vp);
 227   vik_layer_rename ( VIK_LAYER(rv), vik_gps_layer_interface.name );
 228
 229   for (i = 0; i < NUM_TRW; i++) {
 230     rv->trw_children[i] = VIK_TRW_LAYER(vik_layer_create ( VIK_LAYER_TRW, vp, NULL, FALSE ));
 231     vik_layer_set_menu_items_selection(VIK_LAYER(rv->trw_children[i]), VIK_MENU_ITEM_ALL & ~(VIK_MENU_ITEM_CUT|VIK_MENU_ITEM_DELETE));
 232   }
 233   return rv;
 234 }
 235
 236 /* "Copy" */
 237 static void gps_layer_marshall( VikGpsLayer *vgl, guint8 **data, gint *datalen )
 238 {
 239   VikLayer *child_layer;
 240   guint8 *ld;
 241   gint ll;
 242   GByteArray* b = g_byte_array_new ();
 243   gint len;
 244   gint i;
 245
 246 #define alm_append(obj, sz)     \
 247   len = (sz);                   \
 248   g_byte_array_append ( b, (guint8 *)&len, sizeof(len) );       \
 249   g_byte_array_append ( b, (guint8 *)(obj), len );
 250
 251   vik_layer_marshall_params(VIK_LAYER(vgl), &ld, &ll);
 252   alm_append(ld, ll);
 253   g_free(ld);
 254
 255   for (i = 0; i < NUM_TRW; i++) {
 256     child_layer = VIK_LAYER(vgl->trw_children[i]);
 257     vik_layer_marshall(child_layer, &ld, &ll);
 258     if (ld) {
 259       alm_append(ld, ll);
 260       g_free(ld);
 261     }
 262   }
 263   *data = b->data;
 264   *datalen = b->len;
 265   g_byte_array_free(b, FALSE);
 266 #undef alm_append
 267 }
 268
 269 /* "Paste" */
 270 static VikGpsLayer *gps_layer_unmarshall( guint8 *data, gint len, VikViewport *vvp )
 271 {
 272 #define alm_size (*(gint *)data)
 273 #define alm_next \
 274   len -= sizeof(gint) + alm_size; \
 275   data += sizeof(gint) + alm_size;
 276
 277   VikGpsLayer *rv = vik_gps_layer_new();
 278   VikLayer *child_layer;
 279   gint i;
 280
 281   vik_layer_unmarshall_params ( VIK_LAYER(rv), data+sizeof(gint), alm_size, vvp );
 282   alm_next;
 283
 284   i = 0;
 285   while (len>0 && i < NUM_TRW) {
 286     child_layer = vik_layer_unmarshall ( data + sizeof(gint), alm_size, vvp );
 287     if (child_layer) {
 288       rv->trw_children[i++] = (VikTrwLayer *)child_layer;
 289       g_signal_connect_swapped ( G_OBJECT(child_layer), "update", G_CALLBACK(vik_layer_emit_update_secondary), rv );
 290     }
 291     alm_next;
 292   }
 293   //  g_print("gps_layer_unmarshall ended with len=%d\n", len);
 294   g_assert(len == 0);
 295   return rv;
 296 #undef alm_size
 297 #undef alm_next
 298 }
 299
 300 static gboolean gps_layer_set_param ( VikGpsLayer *vgl, guint16 id, VikLayerParamData data, VikViewport *vp )
 301 {
 302   switch ( id )
 303   {
 304     /* TODO: gpsd_host, gpsd_port */
 305     case PARAM_PROTOCOL:
 306       if (data.u < NUM_PROTOCOLS)
 307         vgl->protocol_id = data.u;
 308       else
 309         g_warning("Unknown GPS Protocol");
 310       break;
 311     case PARAM_PORT:
 312       if (data.u < NUM_PORTS)
 313         vgl->serial_port_id = data.u;
 314       else
 315         g_warning("Unknown serial port device");
 316       break;
 317     case PARAM_GPSD_HOST:
 318       if (vgl->gpsd_host)
 319         g_free(vgl->gpsd_host);
 320       vgl->gpsd_host = g_strdup(data.s);
 321       break;
 322     case PARAM_GPSD_PORT:
 323       if (vgl->gpsd_port)
 324         g_free(vgl->gpsd_port);
 325       vgl->gpsd_port = g_strdup(data.s); /* TODO: check for number */
 326       break;
 327     case PARAM_REALTIME_REC:
 328       vgl->realtime_record = data.b;
 329       break;
 330     case PARAM_REALTIME_CENTER_START:
 331       vgl->realtime_jump_to_start = data.b;
 332       break;
 333     case PARAM_REALTIME_CENTERED:
 334       vgl->realtime_keep_at_center = data.b;
 335       break;
 336     default:
 337       g_warning("gps_layer_set_param(): unknown parameter");
 338   }
 339
 340   return TRUE;
 341 }
 342
 343 static VikLayerParamData gps_layer_get_param ( VikGpsLayer *vgl, guint16 id )
 344 {
 345   VikLayerParamData rv;
 346   switch ( id )
 347   {
 348     /* TODO: gpsd_host, gpsd_port */
 349     case PARAM_PROTOCOL:
 350       rv.u = vgl->protocol_id;
 351       break;
 352     case PARAM_PORT:
 353       rv.u = vgl->serial_port_id;
 354       break;
 355     case PARAM_GPSD_HOST:
 356       rv.s = vgl->gpsd_host ? vgl->gpsd_host : "";
 357       break;
 358     case PARAM_GPSD_PORT:
 359       rv.s = vgl->gpsd_port ? vgl->gpsd_port : g_strdup(DEFAULT_GPSD_PORT);
 360       break;
 361     case PARAM_REALTIME_REC:
 362       rv.b = vgl->realtime_record;
 363       break;
 364     case PARAM_REALTIME_CENTER_START:
 365       rv.b = vgl->realtime_jump_to_start;
 366       break;
 367     case PARAM_REALTIME_CENTERED:
 368       rv.b = vgl->realtime_keep_at_center;
 369       break;
 370     default:
 371       g_warning("gps_layer_get_param(): unknown parameter");
 372   }
 373
 374   return rv;
 375 }
 376
 377 VikGpsLayer *vik_gps_layer_new (VikViewport *vp)
 378 {
 379   gint i;
 380   VikGpsLayer *vgl = VIK_GPS_LAYER ( g_object_new ( VIK_GPS_LAYER_TYPE, NULL ) );
 381   vik_layer_init ( VIK_LAYER(vgl), VIK_LAYER_GPS );
 382   for (i = 0; i < NUM_TRW; i++) {
 383     vgl->trw_children[i] = NULL;
 384   }
 385   vgl->children = NULL;
 386   vgl->cur_read_child = 0;
 387
 388   vgl->realtime_tracking_mutex = g_mutex_new();
 389   vgl->realtime_tracking = FALSE;
 390   vgl->vgpsd = NULL;
 391   vgl->realtime_track_gc = vik_viewport_new_gc ( vp, "#203070", 2 );
 392   vgl->realtime_track_bg_gc = vik_viewport_new_gc ( vp, "grey", 2 );
 393   vgl->realtime_track_pt1_gc = vik_viewport_new_gc ( vp, "red", 2 );
 394   vgl->realtime_track_pt2_gc = vik_viewport_new_gc ( vp, "green", 2 );
 395   vgl->realtime_track_pt_gc = vgl->realtime_track_pt1_gc;
 396   vgl->realtime_gpsd_unit = gpsd_units();
 397   // fprintf(stderr, "DEBUG: gpsd_unit = %d\n", vgl->realtime_gpsd_unit);
 398   vgl->realtime_track = NULL;
 399
 400   /* Setting params here */
 401   vgl->protocol_id = 0;
 402   vgl->serial_port_id = 0;
 403   vgl->gpsd_host = g_strdup("localhost");
 404   vgl->gpsd_port = g_strdup(DEFAULT_GPSD_PORT);
 405   vgl->realtime_record = TRUE;
 406   vgl->realtime_jump_to_start = TRUE;
 407   vgl->realtime_keep_at_center = FALSE;
 408
 409   return vgl;
 410 }
 411
 412 static void vik_gps_layer_draw ( VikGpsLayer *vgl, gpointer data )
 413 {
 414   gint i;
 415   VikLayer *vl;
 416   VikLayer *trigger = VIK_LAYER(vik_viewport_get_trigger( VIK_VIEWPORT(data) ));
 417
 418   for (i = 0; i < NUM_TRW; i++) {
 419     vl = VIK_LAYER(vgl->trw_children[i]);
 420     if (vl == trigger) {
 421       if ( vik_viewport_get_half_drawn ( VIK_VIEWPORT(data) ) ) {
 422         vik_viewport_set_half_drawn ( VIK_VIEWPORT(data), FALSE );
 423         vik_viewport_snapshot_load( VIK_VIEWPORT(data) );
 424       } else {
 425         vik_viewport_snapshot_save( VIK_VIEWPORT(data) );
 426       }
 427     }
 428     if (!vik_viewport_get_half_drawn( VIK_VIEWPORT(data)))
 429       vik_layer_draw ( vl, data );
 430   }
 431   if (vgl->realtime_tracking) {
 432     if (VIK_LAYER(vgl) == trigger) {
 433       if ( vik_viewport_get_half_drawn ( VIK_VIEWPORT(data) ) ) {
 434         vik_viewport_set_half_drawn ( VIK_VIEWPORT(data), FALSE );
 435         vik_viewport_snapshot_load( VIK_VIEWPORT(data) );
 436       } else {
 437         vik_viewport_snapshot_save( VIK_VIEWPORT(data) );
 438       }
 439     }
 440     if (!vik_viewport_get_half_drawn( VIK_VIEWPORT(data)))
 441       realtime_tracking_draw(vgl, VIK_VIEWPORT(data));
 442   }
 443 }
 444
 445 static void gps_layer_change_coord_mode ( VikGpsLayer *vgl, VikCoordMode mode )
 446 {
 447   gint i;
 448   for (i = 0; i < NUM_TRW; i++) {
 449     vik_layer_change_coord_mode(VIK_LAYER(vgl->trw_children[i]), mode);
 450   }
 451 }
 452
 453 static void gps_layer_add_menu_items( VikGpsLayer *vgl, GtkMenu *menu, gpointer vlp )
 454 {
 455   static gpointer pass_along[2];
 456   GtkWidget *item;
 457   pass_along[0] = vgl;
 458   pass_along[1] = vlp;
 459
 460   item = gtk_menu_item_new();
 461   gtk_menu_shell_append ( GTK_MENU_SHELL(menu), item );
 462   gtk_widget_show ( item );
 463
 464   item = gtk_menu_item_new_with_label ( "Upload to GPS" );
 465   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_upload_cb), pass_along );
 466   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 467   gtk_widget_show ( item );
 468
 469   item = gtk_menu_item_new_with_label ( "Download from GPS" );
 470   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_download_cb), pass_along );
 471   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 472   gtk_widget_show ( item );
 473
 474   item = gtk_menu_item_new_with_label ( vgl->realtime_tracking  ?
 475                                        "Stop realtime tracking" :
 476                                        "Start realtime tracking" );
 477   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_start_stop_tracking_cb), pass_along );
 478   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 479   gtk_widget_show ( item );
 480
 481   item = gtk_menu_item_new();
 482   gtk_menu_shell_append ( GTK_MENU_SHELL(menu), item );
 483   gtk_widget_show ( item );
 484
 485   item = gtk_menu_item_new_with_label ( "Empty Upload" );
 486   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_empty_upload_cb), pass_along );
 487   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 488   gtk_widget_show ( item );
 489
 490   item = gtk_menu_item_new_with_label ( "Empty Download" );
 491   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_empty_download_cb), pass_along );
 492   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 493   gtk_widget_show ( item );
 494
 495   item = gtk_menu_item_new_with_label ( "Empty All" );
 496   g_signal_connect_swapped ( G_OBJECT(item), "activate", G_CALLBACK(gps_empty_all_cb), pass_along );
 497   gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
 498   gtk_widget_show ( item );
 499
 500 }
 501
 502 static void disconnect_layer_signal ( VikLayer *vl, VikGpsLayer *vgl )
 503 {
 504   g_assert(DISCONNECT_UPDATE_SIGNAL(vl,vgl)==1);
 505 }
 506
 507 static void vik_gps_layer_free ( VikGpsLayer *vgl )
 508 {
 509   gint i;
 510   for (i = 0; i < NUM_TRW; i++) {
 511     if (vgl->vl.realized)
 512       disconnect_layer_signal(VIK_LAYER(vgl->trw_children[i]), vgl);
 513     g_object_unref(vgl->trw_children[i]);
 514   }
 515   if (vgl->realtime_track_gc != NULL)
 516     g_object_unref(vgl->realtime_track_gc);
 517   if (vgl->realtime_track_bg_gc != NULL)
 518     g_object_unref(vgl->realtime_track_bg_gc);
 519   if (vgl->realtime_track_pt1_gc != NULL)
 520     g_object_unref(vgl->realtime_track_pt1_gc);
 521   if (vgl->realtime_track_pt2_gc != NULL)
 522     g_object_unref(vgl->realtime_track_pt2_gc);
 523   if (vgl->realtime_tracking_mutex != NULL)
 524    g_mutex_free(vgl->realtime_tracking_mutex);
 525 }
 526
 527 gboolean vik_gps_layer_delete ( VikGpsLayer *vgl, GtkTreeIter *iter )
 528 {
 529   gint i;
 530   VikLayer *l = VIK_LAYER( vik_treeview_item_get_pointer ( VIK_LAYER(vgl)->vt, iter ) );
 531   gboolean was_visible = l->visible;
 532
 533   vik_treeview_item_delete ( VIK_LAYER(vgl)->vt, iter );
 534   for (i = 0; i < NUM_TRW; i++) {
 535     if (VIK_LAYER(vgl->trw_children[i]) == l)
 536       vgl->trw_children[i] = NULL;
 537   }
 538   g_assert(DISCONNECT_UPDATE_SIGNAL(l,vgl)==1);
 539   g_object_unref ( l );
 540
 541   return was_visible;
 542 }
 543
 544 static void vik_gps_layer_realize ( VikGpsLayer *vgl, VikTreeview *vt, GtkTreeIter *layer_iter )
 545 {
 546   GtkTreeIter iter;
 547   int ix;
 548
 549   for (ix = 0; ix < NUM_TRW; ix++) {
 550     VikLayer * trw = VIK_LAYER(vgl->trw_children[ix]);
 551     vik_treeview_add_layer ( VIK_LAYER(vgl)->vt, layer_iter, &iter,
 552         trw_names[ix], vgl,
 553         trw, trw->type, trw->type );
 554     if ( ! trw->visible )
 555       vik_treeview_item_set_visible ( VIK_LAYER(vgl)->vt, &iter, FALSE );
 556     vik_layer_realize ( trw, VIK_LAYER(vgl)->vt, &iter );
 557     g_signal_connect_swapped ( G_OBJECT(trw), "update", G_CALLBACK(vik_layer_emit_update_secondary), vgl );
 558   }
 559 }
 560
 561 const GList *vik_gps_layer_get_children ( VikGpsLayer *vgl )
 562 {
 563   int i;
 564
 565   if (vgl->children == NULL) {
 566     for (i = NUM_TRW - 1; i >= 0; i--)
 567       vgl->children = g_list_prepend(vgl->children, vgl->trw_children[i]);
 568   }
 569   return vgl->children;
 570 }
 571
 572 VikTrwLayer * vik_gps_layer_get_a_child(VikGpsLayer *vgl)
 573 {
 574   g_assert ((vgl->cur_read_child >= 0) && (vgl->cur_read_child < NUM_TRW));
 575
 576   VikTrwLayer * vtl = vgl->trw_children[vgl->cur_read_child];
 577   if (++(vgl->cur_read_child) >= NUM_TRW)
 578     vgl->cur_read_child = 0;
 579   return(vtl);
 580 }
 581
 582 gboolean vik_gps_layer_is_empty ( VikGpsLayer *vgl )
 583 {
 584   if ( vgl->trw_children[0] )
 585     return FALSE;
 586   return TRUE;
 587 }
 588
 589 static void gps_layer_drag_drop_request ( VikGpsLayer *val_src, VikGpsLayer *val_dest, GtkTreeIter *src_item_iter, GtkTreePath *dest_path )
 590 {
 591   VikTreeview *vt = VIK_LAYER(val_src)->vt;
 592   VikLayer *vl = vik_treeview_item_get_pointer(vt, src_item_iter);
 593   GtkTreeIter dest_iter;
 594   gchar *dp;
 595   gboolean target_exists;
 596
 597   dp = gtk_tree_path_to_string(dest_path);
 598   target_exists = vik_treeview_get_iter_from_path_str(vt, &dest_iter, dp);
 599
 600   /* vik_gps_layer_delete unrefs, but we don't want that here.
 601    * we're still using the layer. */
 602   g_object_ref ( vl );
 603   vik_gps_layer_delete(val_src, src_item_iter);
 604
 605   g_free(dp);
 606 }
 607
 608 static void gps_session_delete(GpsSession *sess)
 609 {
 610   /* TODO */
 611   g_mutex_free(sess->mutex);
 612   g_free(sess->cmd_args);
 613
 614   g_free(sess);
 615
 616 }
 617
 618 static void set_total_count(gint cnt, GpsSession *sess)
 619 {
 620   gchar s[128];
 621   gdk_threads_enter();
 622   g_mutex_lock(sess->mutex);
 623   if (sess->ok) {
 624     g_sprintf(s, "%s %d %s...",
 625         (sess->direction == GPS_DOWN) ? "Downloading" : "Uploading", cnt,
 626         (sess->progress_label == sess->wp_label) ? "waypoints" : "trackpoints");
 627     gtk_label_set_text ( GTK_LABEL(sess->progress_label), s );
 628     gtk_widget_show ( sess->progress_label );
 629     sess->total_count = cnt;
 630   }
 631   g_mutex_unlock(sess->mutex);
 632   gdk_threads_leave();
 633 }
 634
 635 static void set_current_count(gint cnt, GpsSession *sess)
 636 {
 637   gchar s[128];
 638   gchar *dir_str = (sess->direction == GPS_DOWN) ? "Downloaded" : "Uploaded";
 639
 640   gdk_threads_enter();
 641   g_mutex_lock(sess->mutex);
 642   if (sess->ok) {
 643     if (cnt < sess->total_count) {
 644       g_sprintf(s, "%s %d out of %d %s...", dir_str, cnt, sess->total_count, (sess->progress_label == sess->wp_label) ? "waypoints" : "trackpoints");
 645     } else {
 646       g_sprintf(s, "%s %d %s.", dir_str, cnt, (sess->progress_label == sess->wp_label) ? "waypoints" : "trackpoints");
 647     }
 648     gtk_label_set_text ( GTK_LABEL(sess->progress_label), s );
 649   }
 650   g_mutex_unlock(sess->mutex);
 651   gdk_threads_leave();
 652 }
 653
 654 static void set_gps_info(const gchar *info, GpsSession *sess)
 655 {
 656   gchar s[256];
 657   gdk_threads_enter();
 658   g_mutex_lock(sess->mutex);
 659   if (sess->ok) {
 660     g_sprintf(s, "GPS Device: %s", info);
 661     gtk_label_set_text ( GTK_LABEL(sess->gps_label), s );
 662   }
 663   g_mutex_unlock(sess->mutex);
 664   gdk_threads_leave();
 665 }
 666
 667 static void gps_download_progress_func(BabelProgressCode c, gpointer data, GpsSession * sess )
 668 {
 669   gchar *line;
 670
 671   gdk_threads_enter ();
 672   g_mutex_lock(sess->mutex);
 673   if (!sess->ok) {
 674     g_mutex_unlock(sess->mutex);
 675     gps_session_delete(sess);
 676     gdk_threads_leave();
 677     g_thread_exit ( NULL );
 678   }
 679   g_mutex_unlock(sess->mutex);
 680   gdk_threads_leave ();
 681
 682   switch(c) {
 683   case BABEL_DIAG_OUTPUT:
 684     line = (gchar *)data;
 685
 686     /* tells us how many items there will be */
 687     if (strstr(line, "Xfer Wpt")) {
 688       sess->progress_label = sess->wp_label;
 689     }
 690     if (strstr(line, "Xfer Trk")) {
 691       sess->progress_label = sess->trk_label;
 692     }
 693     if (strstr(line, "PRDDAT")) {
 694       gchar **tokens = g_strsplit(line, " ", 0);
 695       gchar info[128];
 696       int ilen = 0;
 697       int i;
 698       int n_tokens = 0;
 699
 700       while (tokens[n_tokens])
 701         n_tokens++;
 702
 703       if (n_tokens > 8) {
 704         for (i=8; tokens[i] && ilen < sizeof(info)-2 && strcmp(tokens[i], "00"); i++) {
 705           guint ch;
 706           sscanf(tokens[i], "%x", &ch);
 707           info[ilen++] = ch;
 708         }
 709         info[ilen++] = 0;
 710         set_gps_info(info, sess);
 711       }
 712       g_strfreev(tokens);
 713     }
 714     if (strstr(line, "RECORD")) {
 715       int lsb, msb, cnt;
 716
 717       if (strlen(line) > 20) {
 718         sscanf(line+17, "%x", &lsb);
 719         sscanf(line+20, "%x", &msb);
 720         cnt = lsb + msb * 256;
 721         set_total_count(cnt, sess);
 722         sess->count = 0;
 723       }
 724     }
 725     if ( strstr(line, "WPTDAT") || strstr(line, "TRKHDR") || strstr(line, "TRKDAT") ) {
 726       sess->count++;
 727       set_current_count(sess->count, sess);
 728     }
 729     break;
 730   case BABEL_DONE:
 731     break;
 732   default:
 733     break;
 734   }
 735
 736 }
 737
 738 static void gps_upload_progress_func(BabelProgressCode c, gpointer data, GpsSession * sess )
 739 {
 740   gchar *line;
 741   static int cnt = 0;
 742
 743   gdk_threads_enter ();
 744   g_mutex_lock(sess->mutex);
 745   if (!sess->ok) {
 746     g_mutex_unlock(sess->mutex);
 747     gps_session_delete(sess);
 748     gdk_threads_leave();
 749     g_thread_exit ( NULL );
 750   }
 751   g_mutex_unlock(sess->mutex);
 752   gdk_threads_leave ();
 753
 754   switch(c) {
 755   case BABEL_DIAG_OUTPUT:
 756     line = (gchar *)data;
 757
 758     if (strstr(line, "PRDDAT")) {
 759       gchar **tokens = g_strsplit(line, " ", 0);
 760       gchar info[128];
 761       int ilen = 0;
 762       int i;
 763       int n_tokens = 0;
 764
 765       while (tokens[n_tokens])
 766         n_tokens++;
 767
 768       if (n_tokens > 8) {
 769         for (i=8; tokens[i] && ilen < sizeof(info)-2 && strcmp(tokens[i], "00"); i++) {
 770           guint ch;
 771           sscanf(tokens[i], "%x", &ch);
 772           info[ilen++] = ch;
 773         }
 774         info[ilen++] = 0;
 775         set_gps_info(info, sess);
 776       }
 777       g_strfreev(tokens);
 778     }
 779     if (strstr(line, "RECORD")) {
 780       int lsb, msb;
 781
 782       if (strlen(line) > 20) {
 783         sscanf(line+17, "%x", &lsb);
 784         sscanf(line+20, "%x", &msb);
 785         cnt = lsb + msb * 256;
 786         /* set_total_count(cnt, sess); */
 787         sess->count = 0;
 788       }
 789     }
 790     if ( strstr(line, "WPTDAT")) {
 791       if (sess->count == 0) {
 792         sess->progress_label = sess->wp_label;
 793         set_total_count(cnt, sess);
 794       }
 795       sess->count++;
 796       set_current_count(sess->count, sess);
 797
 798     }
 799     if ( strstr(line, "TRKHDR") || strstr(line, "TRKDAT") ) {
 800       if (sess->count == 0) {
 801         sess->progress_label = sess->trk_label;
 802         set_total_count(cnt, sess);
 803       }
 804       sess->count++;
 805       set_current_count(sess->count, sess);
 806     }
 807     break;
 808   case BABEL_DONE:
 809     break;
 810   default:
 811     break;
 812   }
 813
 814 }
 815
 816 static void gps_comm_thread(GpsSession *sess)
 817 {
 818   gboolean result;
 819
 820   if (sess->direction == GPS_DOWN)
 821     result = a_babel_convert_from (sess->vtl, sess->cmd_args,
 822         (BabelStatusFunc) gps_download_progress_func, sess->port, sess);
 823   else
 824     result = a_babel_convert_to (sess->vtl, sess->cmd_args,
 825         (BabelStatusFunc) gps_upload_progress_func, sess->port, sess);
 826
 827   gdk_threads_enter();
 828   if (!result) {
 829     gtk_label_set_text ( GTK_LABEL(sess->status_label), "Error: couldn't find gpsbabel." );
 830   }
 831   else {
 832     g_mutex_lock(sess->mutex);
 833     if (sess->ok) {
 834       gtk_label_set_text ( GTK_LABEL(sess->status_label), "Done." );
 835       gtk_dialog_set_response_sensitive ( GTK_DIALOG(sess->dialog), GTK_RESPONSE_ACCEPT, TRUE );
 836       gtk_dialog_set_response_sensitive ( GTK_DIALOG(sess->dialog), GTK_RESPONSE_REJECT, FALSE );
 837     } else {
 838       /* canceled */
 839     }
 840     g_mutex_unlock(sess->mutex);
 841   }
 842
 843   g_mutex_lock(sess->mutex);
 844   if (sess->ok) {
 845     sess->ok = FALSE;
 846     g_mutex_unlock(sess->mutex);
 847   }
 848   else {
 849     g_mutex_unlock(sess->mutex);
 850     gps_session_delete(sess);
 851   }
 852   gdk_threads_leave();
 853   g_thread_exit(NULL);
 854 }
 855
 856 static gint gps_comm(VikTrwLayer *vtl, gps_dir dir, vik_gps_proto proto, gchar *port) {
 857   GpsSession *sess = g_malloc(sizeof(GpsSession));
 858
 859   sess->mutex = g_mutex_new();
 860   sess->direction = dir;
 861   sess->vtl = vtl;
 862   sess->port = g_strdup(port);
 863   sess->ok = TRUE;
 864   sess->cmd_args = g_strdup_printf("-D 9 -t -w -%c %s",
 865       (dir == GPS_DOWN) ? 'i' : 'o', protocols_args[proto]);
 866   sess->window_title = (dir == GPS_DOWN) ? "GPS Download" : "GPS Upload";
 867
 868   sess->dialog = gtk_dialog_new_with_buttons ( "", VIK_GTK_WINDOW_FROM_LAYER(vtl), 0, GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT, NULL );
 869   gtk_dialog_set_response_sensitive ( GTK_DIALOG(sess->dialog),
 870       GTK_RESPONSE_ACCEPT, FALSE );
 871   gtk_window_set_title ( GTK_WINDOW(sess->dialog), sess->window_title );
 872
 873   sess->status_label = gtk_label_new ("Status: detecting gpsbabel");
 874   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(sess->dialog)->vbox),
 875       sess->status_label, FALSE, FALSE, 5 );
 876   gtk_widget_show_all(sess->status_label);
 877
 878   sess->gps_label = gtk_label_new ("GPS device: N/A");
 879   sess->ver_label = gtk_label_new ("");
 880   sess->id_label = gtk_label_new ("");
 881   sess->wp_label = gtk_label_new ("");
 882   sess->trk_label = gtk_label_new ("");
 883
 884   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(sess->dialog)->vbox), sess->gps_label, FALSE, FALSE, 5 );
 885   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(sess->dialog)->vbox), sess->wp_label, FALSE, FALSE, 5 );
 886   gtk_box_pack_start ( GTK_BOX(GTK_DIALOG(sess->dialog)->vbox), sess->trk_label, FALSE, FALSE, 5 );
 887
 888   gtk_widget_show_all(sess->dialog);
 889
 890   sess->progress_label = sess->wp_label;
 891   sess->total_count = -1;
 892
 893   /* TODO: starting gps read/write thread here */
 894   g_thread_create((GThreadFunc)gps_comm_thread, sess, FALSE, NULL );
 895
 896   gtk_dialog_run(GTK_DIALOG(sess->dialog));
 897
 898   gtk_widget_destroy(sess->dialog);
 899
 900   g_mutex_lock(sess->mutex);
 901   if (sess->ok) {
 902     sess->ok = FALSE;   /* tell thread to stop */
 903     g_mutex_unlock(sess->mutex);
 904   }
 905   else {
 906     g_mutex_unlock(sess->mutex);
 907     gps_session_delete(sess);
 908   }
 909
 910   return 0;
 911 }
 912
 913 static void gps_upload_cb( gpointer layer_and_vlp[2] )
 914 {
 915   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
 916   VikTrwLayer *vtl = vgl->trw_children[TRW_UPLOAD];
 917   gps_comm(vtl, GPS_UP, vgl->protocol_id, params_ports[vgl->serial_port_id]);
 918 }
 919
 920 static void gps_download_cb( gpointer layer_and_vlp[2] )
 921 {
 922   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
 923   VikTrwLayer *vtl = vgl->trw_children[TRW_DOWNLOAD];
 924   gps_comm(vtl, GPS_DOWN, vgl->protocol_id, params_ports[vgl->serial_port_id]);
 925 }
 926
 927 static void gps_empty_upload_cb( gpointer layer_and_vlp[2] )
 928 {
 929   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
 930   vik_trw_layer_delete_all_waypoints ( vgl-> trw_children[TRW_UPLOAD]);
 931   vik_trw_layer_delete_all_tracks ( vgl-> trw_children[TRW_UPLOAD]);
 932 }
 933
 934 static void gps_empty_download_cb( gpointer layer_and_vlp[2] )
 935 {
 936   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
 937   vik_trw_layer_delete_all_waypoints ( vgl-> trw_children[TRW_DOWNLOAD]);
 938   vik_trw_layer_delete_all_tracks ( vgl-> trw_children[TRW_DOWNLOAD]);
 939 }
 940
 941 static void gps_empty_all_cb( gpointer layer_and_vlp[2] )
 942 {
 943   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
 944   vik_trw_layer_delete_all_waypoints ( vgl-> trw_children[TRW_UPLOAD]);
 945   vik_trw_layer_delete_all_tracks ( vgl-> trw_children[TRW_UPLOAD]);
 946   vik_trw_layer_delete_all_waypoints ( vgl-> trw_children[TRW_DOWNLOAD]);
 947   vik_trw_layer_delete_all_tracks ( vgl-> trw_children[TRW_DOWNLOAD]);
 948 }
 949
 950 static void realtime_tracking_draw(VikGpsLayer *vgl, VikViewport *vp)
 951 {
 952   struct LatLon ll;
 953   VikCoord nw, se;
 954   struct LatLon lnw, lse;
 955   vik_viewport_screen_to_coord ( vp, -20, -20, &nw );
 956   vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp)+20, vik_viewport_get_width(vp)+20, &se );
 957   vik_coord_to_latlon ( &nw, &lnw );
 958   vik_coord_to_latlon ( &se, &lse );
 959   if ( vgl->realtime_fix.fix.latitude > lse.lat &&
 960        vgl->realtime_fix.fix.latitude < lnw.lat &&
 961        vgl->realtime_fix.fix.longitude > lnw.lon &&
 962        vgl->realtime_fix.fix.longitude < lse.lon ) {
 963     VikCoord gps;
 964     gint x, y;
 965     gint half_back_x, half_back_y;
 966     gint half_back_bg_x, half_back_bg_y;
 967     gint pt_x, pt_y;
 968     gint ptbg_x, ptbg_y;
 969     gint side1_x, side1_y, side2_x, side2_y;
 970     gint side1bg_x, side1bg_y, side2bg_x, side2bg_y;
 971
 972     ll.lat = vgl->realtime_fix.fix.latitude;
 973     ll.lon = vgl->realtime_fix.fix.longitude;
 974     vik_coord_load_from_latlon ( &gps, vik_viewport_get_coord_mode(vp), &ll);
 975     vik_viewport_coord_to_screen ( vp, &gps, &x, &y );
 976
 977     gdouble heading_cos = cos(M_PI/180*vgl->realtime_fix.fix.track);
 978     gdouble heading_sin = sin(M_PI/180*vgl->realtime_fix.fix.track);
 979
 980     half_back_y = y+8*heading_cos;
 981     half_back_x = x-8*heading_sin;
 982     half_back_bg_y = y+10*heading_cos;
 983     half_back_bg_x = x-10*heading_sin;
 984
 985     pt_y = half_back_y-24*heading_cos;
 986     pt_x = half_back_x+24*heading_sin;
 987     ptbg_y = half_back_bg_y-28*heading_cos;
 988     ptbg_x = half_back_bg_x+28*heading_sin;
 989
 990     side1_y = half_back_y+9*heading_sin;
 991     side1_x = half_back_x+9*heading_cos;
 992     side1bg_y = half_back_bg_y+11*heading_sin;
 993     side1bg_x = half_back_bg_x+11*heading_cos;
 994
 995     side2_y = half_back_y-9*heading_sin;
 996     side2_x = half_back_x-9*heading_cos;
 997     side2bg_y = half_back_bg_y-11*heading_sin;
 998     side2bg_x = half_back_bg_x-11*heading_cos;
 999
1000      GdkPoint trian[3] = { { pt_x, pt_y }, {side1_x, side1_y}, {side2_x, side2_y} };
1001      GdkPoint trian_bg[3] = { { ptbg_x, pt_y }, {side1bg_x, side1bg_y}, {side2bg_x, side2bg_y} };
1002
1003      vik_viewport_draw_polygon ( vp, vgl->realtime_track_bg_gc, TRUE, trian_bg, 3 );
1004      vik_viewport_draw_polygon ( vp, vgl->realtime_track_gc, TRUE, trian, 3 );
1005      vik_viewport_draw_rectangle ( vp,
1006          (vgl->realtime_fix.fix.mode > MODE_2D) ? vgl->realtime_track_pt2_gc : vgl->realtime_track_pt1_gc,
1007          TRUE, x-2, y-2, 4, 4 );
1008      //vgl->realtime_track_pt_gc = (vgl->realtime_track_pt_gc == vgl->realtime_track_pt1_gc) ? vgl->realtime_track_pt2_gc : vgl->realtime_track_pt1_gc;
1009   }
1010 }
1011
1012 /* lock/unlock realtime_tracking_mutex when call this */
1013 static void create_realtime_trackpoint(VikGpsLayer *vgl, gboolean forced)
1014 {
1015     struct LatLon ll;
1016     GList *last_tp;
1017
1018     /* Note that fix.time is a double, but it should not affect the precision
1019        for most GPS */
1020     time_t cur_timestamp = vgl->realtime_fix.fix.time;
1021     time_t last_timestamp = vgl->last_fix.fix.time;
1022
1023     if (cur_timestamp < last_timestamp) {
1024       return;
1025     }
1026
1027     if (vgl->realtime_record && vgl->realtime_fix.dirty) {
1028       gboolean replace = FALSE;
1029       int heading = (int)floor(vgl->realtime_fix.fix.track);
1030       int last_heading = (int)floor(vgl->last_fix.fix.track);
1031       int alt = isnan(vgl->realtime_fix.fix.altitude) ? VIK_DEFAULT_ALTITUDE : floor(vgl->realtime_fix.fix.altitude);
1032       int last_alt = isnan(vgl->last_fix.fix.altitude) ? VIK_DEFAULT_ALTITUDE : floor(vgl->last_fix.fix.altitude);
1033       if (((last_tp = g_list_last(vgl->realtime_track->trackpoints)) != NULL) &&
1034           (vgl->realtime_fix.fix.mode > MODE_2D) &&
1035           (vgl->last_fix.fix.mode <= MODE_2D) &&
1036           ((cur_timestamp - last_timestamp) < 2)) {
1037         g_free(last_tp->data);
1038         vgl->realtime_track->trackpoints = g_list_delete_link(vgl->realtime_track->trackpoints, last_tp);
1039         replace = TRUE;
1040       }
1041       if (replace ||
1042           ((cur_timestamp != last_timestamp) &&
1043           ((forced ||
1044             ((heading < last_heading) && (heading < (last_heading - 3))) ||
1045             ((heading > last_heading) && (heading > (last_heading + 3))) ||
1046             ((alt != VIK_DEFAULT_ALTITUDE) && (alt != last_alt)))))) {
1047         /* TODO: check for new segments */
1048         VikTrackpoint *tp = vik_trackpoint_new();
1049         tp->newsegment = FALSE;
1050         // tp->altitude = isnan(vgl->realtime_fix.fix.altitude) ? VIK_DEFAULT_ALTITUDE : vgl->realtime_fix.fix.altitude;
1051         tp->altitude = alt;
1052         tp->has_timestamp = TRUE;
1053         tp->timestamp = vgl->realtime_fix.fix.time;
1054
1055         ll.lat = vgl->realtime_fix.fix.latitude;
1056         ll.lon = vgl->realtime_fix.fix.longitude;
1057         vik_coord_load_from_latlon(&tp->coord,
1058              vik_trw_layer_get_coord_mode(vgl->trw_children[TRW_REALTIME]), &ll);
1059
1060         vgl->realtime_track->trackpoints = g_list_append(vgl->realtime_track->trackpoints, tp);
1061         vgl->realtime_fix.dirty = FALSE;
1062         vgl->last_fix = vgl->realtime_fix;
1063       }
1064     }
1065
1066 }
1067
1068 void gpsd_raw_hook(VglGpsd *vgpsd, gchar *data)
1069 {
1070   gboolean update_all = FALSE;
1071   VikGpsLayer *vgl = vgpsd->vgl;
1072
1073   if (!vgl->realtime_tracking) {
1074     g_warning("%s: receiving GPS data while not in realtime mode", __PRETTY_FUNCTION__);
1075     return;
1076   }
1077
1078 #ifdef XXXXXXXXXXXXX
1079   if ((time_t)vgl->realtime_fix.fix.time == (time_t)vgpsd->gpsd.fix.time)
1080     return;
1081 #endif /*XXXXXXXXXXXX*/
1082
1083   if ((vgpsd->gpsd.fix.mode >= MODE_2D) &&
1084       !isnan(vgpsd->gpsd.fix.latitude) &&
1085       !isnan(vgpsd->gpsd.fix.longitude) &&
1086       !isnan(vgpsd->gpsd.fix.track)) {
1087     g_mutex_lock(vgl->realtime_tracking_mutex);
1088     vgl->realtime_fix.fix = vgpsd->gpsd.fix;
1089     vgl->realtime_fix.dirty = TRUE;
1090
1091     if (vgl->realtime_keep_at_center ||
1092         (vgl->realtime_jump_to_start && !vgl->realtime_track->trackpoints)) {
1093       struct LatLon ll;
1094       VikCoord center;
1095
1096       ll.lat = vgl->realtime_fix.fix.latitude;
1097       ll.lon = vgl->realtime_fix.fix.longitude;
1098       vik_coord_load_from_latlon(&center,
1099              vik_trw_layer_get_coord_mode(vgl->trw_children[TRW_REALTIME]), &ll);
1100       VikWindow *vw = VIK_WINDOW(VIK_GTK_WINDOW_FROM_LAYER(vgl));
1101       VikViewport *vvp = vik_window_viewport(vw);
1102       vik_viewport_set_center_coord(vvp, &center);
1103       update_all = TRUE;
1104     }
1105
1106     create_realtime_trackpoint(vgl, FALSE);
1107     g_mutex_unlock(vgl->realtime_tracking_mutex);
1108
1109     vik_layer_emit_update ( update_all ? VIK_LAYER(vgl) : VIK_LAYER(vgl->trw_children[TRW_REALTIME]));
1110   }
1111 }
1112
1113 static gboolean gpsd_data_available(GIOChannel *source, GIOCondition condition, gpointer data)
1114 {
1115   VikGpsLayer *vgl = data;
1116   gps_poll(&vgl->vgpsd->gpsd);
1117   return TRUE;
1118 }
1119
1120 static gchar *make_track_name(VikTrwLayer *vtl)
1121 {
1122   const gchar basename[] = "REALTIME";
1123   const gint bufsize = sizeof(basename) + 5;
1124   gchar *name = g_malloc(bufsize);
1125   strcpy(name, basename);
1126   gint i = 2;
1127
1128   while (vik_trw_layer_get_track(vtl, name) != NULL) {
1129     g_snprintf(name, bufsize, "%s#%d", basename, i);
1130     i++;
1131   }
1132   return(name);
1133
1134 }
1135
1136 static void gps_start_stop_tracking_cb( gpointer layer_and_vlp[2])
1137 {
1138   VikGpsLayer *vgl = (VikGpsLayer *)layer_and_vlp[0];
1139   vgl->realtime_tracking = (vgl->realtime_tracking == FALSE);
1140
1141   if (vgl->realtime_tracking) {
1142     struct gps_data_t *gpsd = gps_open(vgl->gpsd_host, vgl->gpsd_port);
1143     if (gpsd == NULL) {
1144       GtkWidget *dialog = gtk_message_dialog_new (VIK_GTK_WINDOW_FROM_LAYER(vgl),
1145                                   GTK_DIALOG_DESTROY_WITH_PARENT,
1146                                   GTK_MESSAGE_ERROR,
1147                                   GTK_BUTTONS_CLOSE,
1148                                   "Failed to connect to gpsd at %s (port %s)",
1149                                   vgl->gpsd_host, vgl->gpsd_port);
1150       gtk_dialog_run (GTK_DIALOG (dialog));
1151       gtk_widget_destroy (dialog);
1152
1153       vgl->realtime_tracking = FALSE;
1154       return;
1155     }
1156     vgl->vgpsd = g_realloc(gpsd, sizeof(VglGpsd));
1157     vgl->vgpsd->vgl = vgl;
1158
1159     vgl->realtime_fix.dirty = vgl->last_fix.dirty = FALSE;
1160     /* track alt/time graph uses VIK_DEFAULT_ALTITUDE (0.0) as invalid */
1161     vgl->realtime_fix.fix.altitude = vgl->last_fix.fix.altitude = VIK_DEFAULT_ALTITUDE;
1162     vgl->realtime_fix.fix.speed = vgl->last_fix.fix.speed = NAN;
1163
1164     if (vgl->realtime_record) {
1165       VikTrwLayer *vtl = vgl->trw_children[TRW_REALTIME];
1166       vgl->realtime_track = vik_track_new();
1167       vgl->realtime_track->visible = TRUE;
1168       vgl->realtime_track_name = make_track_name(vtl);
1169       vik_trw_layer_add_track(vtl, vgl->realtime_track_name, vgl->realtime_track);
1170     }
1171
1172     gps_set_raw_hook(&vgl->vgpsd->gpsd, gpsd_raw_hook);
1173     vgl->realtime_io_channel = g_io_channel_unix_new(vgl->vgpsd->gpsd.gps_fd);
1174     vgl->realtime_io_watch_id = g_io_add_watch( vgl->realtime_io_channel,
1175                                            G_IO_IN, gpsd_data_available, vgl);
1176
1177     gps_query(&vgl->vgpsd->gpsd, "w+x");
1178
1179   }
1180   else {  /* stop realtime tracking */
1181     /* TODO: handle race condition here , make sure vgpsd is NULL */
1182     g_mutex_lock(vgl->realtime_tracking_mutex);
1183     gps_close(&vgl->vgpsd->gpsd);
1184     vgl->vgpsd = NULL;
1185     // g_source_remove(vgl->realtime_timeout);
1186     g_source_remove(vgl->realtime_io_watch_id);
1187     g_io_channel_unref (vgl->realtime_io_channel);
1188
1189     if (vgl->realtime_record) {
1190       create_realtime_trackpoint(vgl, TRUE);
1191       if ((vgl->realtime_track->trackpoints == NULL) || (vgl->realtime_track->trackpoints->next == NULL))
1192         vik_trw_layer_delete_track(vgl->trw_children[TRW_REALTIME], vgl->realtime_track_name);
1193     }
1194     g_mutex_unlock(vgl->realtime_tracking_mutex);
1195   }
1196 }
1197