/**
* 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;
}
static void
vik_viewport_init ( VikViewport *vvp )
{
viewport_init_ra();
struct UTM utm;
struct LatLon ll;
ll.lat = a_vik_get_default_lat();
ll.lon = a_vik_get_default_long();
gdouble zoom_x = 4.0;
gdouble zoom_y = 4.0;
if ( a_vik_get_startup_method ( ) == VIK_STARTUP_METHOD_LAST_LOCATION ) {
gdouble lat, lon, dzoom;
if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LATITUDE, &lat ) )
ll.lat = lat;
if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LONGITUDE, &lon ) )
ll.lon = lon;
if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_X, &dzoom ) )
zoom_x = dzoom;
if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_Y, &dzoom ) )
zoom_y = dzoom;
}
a_coords_latlon_to_utm ( &ll, &utm );
vvp->xmpp = zoom_x;
vvp->ympp = zoom_y;
vvp->xmfactor = MERCATOR_FACTOR (vvp->xmpp);
vvp->ymfactor = MERCATOR_FACTOR (vvp->ympp);
vvp->coord_mode = VIK_COORD_LATLON;
vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
vvp->center.mode = VIK_COORD_LATLON;
vvp->center.north_south = ll.lat;
vvp->center.east_west = ll.lon;
vvp->center.utm_zone = (int)utm.zone;
vvp->center.utm_letter = utm.letter;
vvp->scr_buffer = NULL;
vvp->alpha_pixbuf = NULL;
vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
vvp->utm_zone_width = 0.0;
vvp->background_gc = NULL;
vvp->highlight_gc = NULL;
vvp->scale_bg_gc = NULL;
vvp->copyrights = NULL;
vvp->draw_scale = TRUE;
vvp->draw_centermark = TRUE;
vvp->draw_highlight = TRUE;
vvp->trigger = NULL;
vvp->snapshot_buffer = NULL;
vvp->half_drawn = FALSE;
g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
#if GTK_CHECK_VERSION (2,18,0)
gtk_widget_set_can_focus ( GTK_WIDGET(vvp), TRUE );
#else
GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
#endif
}
