#include <glib/gi18n.h>
#include <gtk/gtk.h>
+#include "viking.h"
#include "vikutils.h"
#include "globals.h"
#include "download.h"
#include "vikmapslayer.h"
#include "settings.h"
#include "util.h"
+#include "dir.h"
+#include "misc/kdtree.h"
#define FMT_MAX_NUMBER_CODES 9
// expect the difference between track points to be small hence use metres or yards
switch (dist_units) {
case VIK_UNITS_DISTANCE_MILES:
+ case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
dist_units_str = g_strdup ( _("yards") );
break;
default:
}
case 'T': {
- gchar tmp[64];
- tmp[0] = '\0';
+ gchar *msg;
if ( trkpt->has_timestamp ) {
// Compact date time format
- strftime (tmp, sizeof(tmp), "%x %X", localtime(&(trkpt->timestamp)));
+ msg = vu_get_time_string ( &(trkpt->timestamp), "%x %X", &(trkpt->coord), NULL );
}
else
- g_snprintf (tmp, sizeof(tmp), "--");
- values[i] = g_strdup_printf ( _("%sTime %s"), separator, tmp );
+ msg = g_strdup ("--");
+ values[i] = g_strdup_printf ( _("%sTime %s"), separator, msg );
+ g_free ( msg );
break;
}
case 'X': values[i] = g_strdup_printf ( _("%sNo. of Sats %d"), separator, trkpt->nsats ); break;
+ case 'F': {
+ if ( trk ) {
+ // Distance to the end 'Finish' (along the track)
+ gdouble distd = vik_track_get_length_to_trackpoint (trk, trkpt);
+ gdouble diste = vik_track_get_length_including_gaps ( trk );
+ gdouble dist = diste - distd;
+ gchar *dist_units_str = NULL;
+ vik_units_distance_t dist_units = a_vik_get_units_distance ();
+ switch (dist_units) {
+ case VIK_UNITS_DISTANCE_MILES:
+ dist_units_str = g_strdup ( _("miles") );
+ dist = VIK_METERS_TO_MILES(dist);
+ break;
+ case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
+ dist_units_str = g_strdup ( _("NM") );
+ dist = VIK_METERS_TO_NAUTICAL_MILES(dist);
+ break;
+ default:
+ // VIK_UNITS_DISTANCE_KILOMETRES:
+ dist_units_str = g_strdup ( _("km") );
+ dist = dist / 1000.0;
+ break;
+ }
+ values[i] = g_strdup_printf ( _("%sTo End %.2f%s"), separator, dist, dist_units_str );
+ g_free ( dist_units_str );
+ }
+ break;
+ }
+
case 'D': {
if ( trk ) {
// Distance from start (along the track)
gdouble distd = vik_track_get_length_to_trackpoint (trk, trkpt);
gchar *dist_units_str = NULL;
vik_units_distance_t dist_units = a_vik_get_units_distance ();
- // expect the difference between track points to be small hence use metres or yards
switch (dist_units) {
case VIK_UNITS_DISTANCE_MILES:
dist_units_str = g_strdup ( _("miles") );
distd = VIK_METERS_TO_MILES(distd);
break;
+ case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
+ dist_units_str = g_strdup ( _("NM") );
+ distd = VIK_METERS_TO_NAUTICAL_MILES(distd);
+ break;
default:
// VIK_UNITS_DISTANCE_KILOMETRES:
dist_units_str = g_strdup ( _("km") );
return canonical;
}
+
+static struct kdtree *kd = NULL;
+
+static void load_ll_tz_dir ( const gchar *dir )
+{
+ gchar *lltz = g_build_filename ( dir, "latlontz.txt", NULL );
+ if ( g_access(lltz, R_OK) == 0 ) {
+ gchar buffer[4096];
+ long line_num = 0;
+ FILE *ff = g_fopen ( lltz, "r" );
+
+ while ( fgets ( buffer, 4096, ff ) ) {
+ line_num++;
+ gchar **components = g_strsplit (buffer, " ", 3);
+ guint nn = g_strv_length ( components );
+ if ( nn == 3 ) {
+ double pt[2] = { g_ascii_strtod (components[0], NULL), g_ascii_strtod (components[1], NULL) };
+ gchar *timezone = g_strchomp ( components[2] );
+ if ( kd_insert ( kd, pt, timezone ) )
+ g_critical ( "Insertion problem of %s for line %ld of latlontz.txt", timezone, line_num );
+ // NB Don't free timezone as it's part of the kdtree data now
+ g_free ( components[0] );
+ g_free ( components[1] );
+ } else {
+ g_warning ( "Line %ld of latlontz.txt does not have 3 parts", line_num );
+ }
+ g_free ( components );
+ }
+ fclose ( ff );
+ }
+ g_free ( lltz );
+}
+
+/**
+ * vu_setup_lat_lon_tz_lookup:
+ *
+ * Can be called multiple times but only initializes the lookup once
+ */
+void vu_setup_lat_lon_tz_lookup ()
+{
+ // Only setup once
+ if ( kd )
+ return;
+
+ kd = kd_create(2);
+
+ // Look in the directories of data path
+ gchar **data_dirs = a_get_viking_data_path();
+ // Process directories in reverse order for priority
+ guint n_data_dirs = g_strv_length ( data_dirs );
+ for (; n_data_dirs > 0; n_data_dirs--) {
+ load_ll_tz_dir(data_dirs[n_data_dirs-1]);
+ }
+ g_strfreev ( data_dirs );
+}
+
+/**
+ * vu_finalize_lat_lon_tz_lookup:
+ *
+ * Clear memory used by the lookup.
+ * only call on program exit
+ */
+void vu_finalize_lat_lon_tz_lookup ()
+{
+ if ( kd ) {
+ kd_data_destructor ( kd, g_free );
+ kd_free ( kd );
+ }
+}
+
+static double dist_sq( double *a1, double *a2, int dims ) {
+ double dist_sq = 0, diff;
+ while( --dims >= 0 ) {
+ diff = (a1[dims] - a2[dims]);
+ dist_sq += diff*diff;
+ }
+ return dist_sq;
+}
+
+static gchar* time_string_adjusted ( time_t *time, gint offset_s )
+{
+ time_t *mytime = time;
+ *mytime = *mytime + offset_s;
+ gchar *str = g_malloc ( 64 );
+ // Append asterisks to indicate use of simplistic model (i.e. no TZ)
+ strftime ( str, 64, "%a %X %x **", gmtime(mytime) );
+ return str;
+}
+
+static gchar* time_string_tz ( time_t *time, const gchar *format, GTimeZone *tz )
+{
+ GDateTime *utc = g_date_time_new_from_unix_utc (*time);
+ GDateTime *local = g_date_time_to_timezone ( utc, tz );
+ if ( !local ) {
+ g_date_time_unref ( utc );
+ return NULL;
+ }
+ gchar *str = g_date_time_format ( local, format );
+
+ g_date_time_unref ( local );
+ g_date_time_unref ( utc );
+ return str;
+}
+
+#define VIK_SETTINGS_NEAREST_TZ_FACTOR "utils_nearest_tz_factor"
+/**
+ * vu_get_tz_at_location:
+ *
+ * @vc: Position for which the time zone is desired
+ *
+ * Returns: TimeZone string of the nearest known location. String may be NULL.
+ *
+ * Use the k-d tree method (http://en.wikipedia.org/wiki/Kd-tree) to quickly retreive
+ * the nearest location to the given position.
+ */
+gchar* vu_get_tz_at_location ( const VikCoord* vc )
+{
+ gchar *tz = NULL;
+ if ( !vc || !kd )
+ return tz;
+
+ struct LatLon ll;
+ vik_coord_to_latlon ( vc, &ll );
+ double pt[2] = { ll.lat, ll.lon };
+
+ gdouble nearest;
+ if ( !a_settings_get_double(VIK_SETTINGS_NEAREST_TZ_FACTOR, &nearest) )
+ nearest = 1.0;
+
+ struct kdres *presults = kd_nearest_range ( kd, pt, nearest );
+ while( !kd_res_end( presults ) ) {
+ double pos[2];
+ gchar *ans = (gchar*)kd_res_item ( presults, pos );
+ // compute the distance of the current result from the pt
+ double dist = sqrt( dist_sq( pt, pos, 2 ) );
+ if ( dist < nearest ) {
+ //printf( "NEARER node at (%.3f, %.3f, %.3f) is %.3f away is %s\n", pos[0], pos[1], pos[2], dist, ans );
+ nearest = dist;
+ tz = ans;
+ }
+ kd_res_next ( presults );
+ }
+ g_debug ( "TZ lookup found %d results - picked %s", kd_res_size(presults), tz );
+ kd_res_free ( presults );
+
+ return tz;
+}
+
+/**
+ * vu_get_time_string:
+ *
+ * @time_t: The time of which the string is wanted
+ * @format The format of the time string - such as "%c"
+ * @vc: Position of object for the time output - maybe NULL
+ * (only applicable for VIK_TIME_REF_WORLD)
+ * @tz: TimeZone string - maybe NULL.
+ * (only applicable for VIK_TIME_REF_WORLD)
+ * Useful to pass in the cached value from vu_get_tz_at_location() to save looking it up again for the same position
+ *
+ * Returns: A string of the time according to the time display property
+ */
+gchar* vu_get_time_string ( time_t *time, const gchar *format, const VikCoord* vc, const gchar *tz )
+{
+ if ( !format ) return NULL;
+ gchar *str = NULL;
+ switch ( a_vik_get_time_ref_frame() ) {
+ case VIK_TIME_REF_UTC:
+ str = g_malloc ( 64 );
+ strftime ( str, 64, format, gmtime(time) ); // Always 'GMT'
+ break;
+ case VIK_TIME_REF_WORLD:
+ if ( vc && !tz ) {
+ // No timezone specified so work it out
+ gchar *mytz = vu_get_tz_at_location ( vc );
+ if ( mytz ) {
+ GTimeZone *gtz = g_time_zone_new ( mytz );
+ str = time_string_tz ( time, format, gtz );
+ g_time_zone_unref ( gtz );
+ }
+ else {
+ // No results (e.g. could be in the middle of a sea)
+ // Fallback to simplistic method that doesn't take into account Timezones of countries.
+ struct LatLon ll;
+ vik_coord_to_latlon ( vc, &ll );
+ str = time_string_adjusted ( time, round ( ll.lon / 15.0 ) * 3600 );
+ }
+ }
+ else {
+ // Use specified timezone
+ GTimeZone *gtz = g_time_zone_new ( tz );
+ str = time_string_tz ( time, format, gtz );
+ g_time_zone_unref ( gtz );
+ }
+ break;
+ default: // VIK_TIME_REF_LOCALE
+ str = g_malloc ( 64 );
+ strftime ( str, 64, format, localtime(time) );
+ break;
+ }
+ return str;
+}
projects / andy / viking.git / blobdiff