/**
* Based on a simple average speed, but with a twist - to give a moving average.
* . GPSs often report a moving average in their statistics output
* . bicycle speedos often don't factor in time when stopped - hence reporting a moving average for speed
*
* Often GPS track will record every second but not when stationary
* This method doesn't use samples that differ over the specified time limit - effectively skipping that time chunk from the total time
*
* Suggest to use 60 seconds as the stop length (as the default used in the TrackWaypoint draw stops factor)
*/
gdouble vik_track_get_average_speed_moving (const VikTrack *tr, int stop_length_seconds)
{
gdouble len = 0.0;
guint32 time = 0;
if ( tr->trackpoints )
{
GList *iter = tr->trackpoints->next;
while (iter)
{
if ( VIK_TRACKPOINT(iter->data)->has_timestamp &&
VIK_TRACKPOINT(iter->prev->data)->has_timestamp &&
(! VIK_TRACKPOINT(iter->data)->newsegment) )
{
if ( ( VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp ) < stop_length_seconds ) {
len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord),
&(VIK_TRACKPOINT(iter->prev->data)->coord) );
time += ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp);
}
}
iter = iter->next;
}
}
return (time == 0) ? 0 : ABS(len/time);
}
VikTrackpoint* vik_track_get_tp_by_max_speed ( const VikTrack *tr )
{
gdouble maxspeed = 0.0, speed = 0.0;
if ( !tr->trackpoints )
return NULL;
GList *iter = tr->trackpoints;
VikTrackpoint *max_speed_tp = NULL;
while (iter) {
if (iter->prev) {
if ( VIK_TRACKPOINT(iter->data)->has_timestamp &&
VIK_TRACKPOINT(iter->prev->data)->has_timestamp &&
(! VIK_TRACKPOINT(iter->data)->newsegment) ) {
speed = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), &(VIK_TRACKPOINT(iter->prev->data)->coord) )
/ ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp);
if ( speed > maxspeed ) {
maxspeed = speed;
max_speed_tp = VIK_TRACKPOINT(iter->data);
}
}
}
iter = iter->next;
}
if (!max_speed_tp)
return NULL;
return max_speed_tp;
}
static void datasource_gc_draw_circle ( datasource_gc_widgets_t *widgets )
{
gdouble lat, lon;
if ( widgets->circle_onscreen ) {
vik_viewport_draw_arc ( widgets->vvp, widgets->circle_gc, FALSE,
widgets->circle_x - widgets->circle_width/2,
widgets->circle_y - widgets->circle_width/2,
widgets->circle_width, widgets->circle_width, 0, 360*64 );
}
/* calculate widgets circle_x and circle_y */
/* split up lat,lon into lat and lon */
if ( 2 == sscanf ( gtk_entry_get_text ( GTK_ENTRY(widgets->center_entry) ), "%lf,%lf", &lat, &lon ) ) {
struct LatLon ll;
VikCoord c;
gint x, y;
ll.lat = lat; ll.lon = lon;
vik_coord_load_from_latlon ( &c, vik_viewport_get_coord_mode ( widgets->vvp ), &ll );
vik_viewport_coord_to_screen ( widgets->vvp, &c, &x, &y );
/* TODO: real calculation */
if ( x > -1000 && y > -1000 && x < (vik_viewport_get_width(widgets->vvp) + 1000) &&
y < (vik_viewport_get_width(widgets->vvp) + 1000) ) {
VikCoord c1, c2;
gdouble pixels_per_meter;
widgets->circle_x = x;
widgets->circle_y = y;
/* determine miles per pixel */
vik_viewport_screen_to_coord ( widgets->vvp, 0, vik_viewport_get_height(widgets->vvp)/2, &c1 );
vik_viewport_screen_to_coord ( widgets->vvp, vik_viewport_get_width(widgets->vvp), vik_viewport_get_height(widgets->vvp)/2, &c2 );
pixels_per_meter = ((gdouble)vik_viewport_get_width(widgets->vvp)) / vik_coord_diff(&c1, &c2);
/* this is approximate */
widgets->circle_width = gtk_spin_button_get_value_as_float ( GTK_SPIN_BUTTON(widgets->miles_radius_spin) )
* METERSPERMILE * pixels_per_meter * 2;
vik_viewport_draw_arc ( widgets->vvp, widgets->circle_gc, FALSE,
widgets->circle_x - widgets->circle_width/2,
widgets->circle_y - widgets->circle_width/2,
widgets->circle_width, widgets->circle_width, 0, 360*64 );
widgets->circle_onscreen = TRUE;
} else
widgets->circle_onscreen = FALSE;
}
/* see if onscreen */
/* okay */
vik_viewport_sync ( widgets->vvp );
}
gdouble vik_track_get_length_including_gaps(const VikTrack *tr)
{
gdouble len = 0.0;
if ( tr->trackpoints )
{
GList *iter = tr->trackpoints->next;
while (iter)
{
len += vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord),
&(VIK_TRACKPOINT(iter->prev->data)->coord) );
iter = iter->next;
}
}
return len;
}
/* by Alex Foobarian */
VikTrackpoint *vik_track_get_closest_tp_by_percentage_dist ( VikTrack *tr, gdouble reldist, gdouble *meters_from_start )
{
gdouble dist = vik_track_get_length_including_gaps(tr) * reldist;
gdouble current_dist = 0.0;
gdouble current_inc = 0.0;
if ( tr->trackpoints )
{
GList *iter = tr->trackpoints->next;
GList *last_iter = NULL;
gdouble last_dist = 0.0;
while (iter)
{
current_inc = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord),
&(VIK_TRACKPOINT(iter->prev->data)->coord) );
last_dist = current_dist;
current_dist += current_inc;
if ( current_dist >= dist )
break;
last_iter = iter;
iter = iter->next;
}
if (!iter) { /* passing the end the track */
if (last_iter) {
if (meters_from_start)
*meters_from_start = last_dist;
return(VIK_TRACKPOINT(last_iter->data));
}
else
return NULL;
}
/* we've gone past the dist already, was prev trackpoint closer? */
/* should do a vik_coord_average_weighted() thingy. */
if ( iter->prev && abs(current_dist-current_inc-dist) < abs(current_dist-dist) ) {
if (meters_from_start)
*meters_from_start = last_dist;
iter = iter->prev;
}
else
if (meters_from_start)
*meters_from_start = current_dist;
return VIK_TRACKPOINT(iter->data);
}
return NULL;
}
static void tpwin_sync_ll_to_tp ( VikTrwLayerTpwin *tpwin )
{
if ( tpwin->cur_tp && (!tpwin->sync_to_tp_block) )
{
struct LatLon ll;
VikCoord coord;
ll.lat = gtk_spin_button_get_value ( tpwin->lat );
ll.lon = gtk_spin_button_get_value ( tpwin->lon );
vik_coord_load_from_latlon ( &coord, tpwin->cur_tp->coord.mode, &ll );
/* don't redraw unless we really have to */
if ( vik_coord_diff(&(tpwin->cur_tp->coord), &coord) > 0.05 ) /* may not be exact due to rounding */
{
tpwin->cur_tp->coord = coord;
gtk_dialog_response ( GTK_DIALOG(tpwin), VIK_TRW_LAYER_TPWIN_DATA_CHANGED );
}
}
}
gdouble vik_track_get_max_speed(const VikTrack *tr)
{
gdouble maxspeed = 0.0, speed = 0.0;
if ( tr->trackpoints )
{
GList *iter = tr->trackpoints->next;
while (iter)
{
if ( VIK_TRACKPOINT(iter->data)->has_timestamp &&
VIK_TRACKPOINT(iter->prev->data)->has_timestamp &&
(! VIK_TRACKPOINT(iter->data)->newsegment) )
{
speed = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord), &(VIK_TRACKPOINT(iter->prev->data)->coord) )
/ ABS(VIK_TRACKPOINT(iter->data)->timestamp - VIK_TRACKPOINT(iter->prev->data)->timestamp);
if ( speed > maxspeed )
maxspeed = speed;
}
iter = iter->next;
}
}
return maxspeed;
}
/**
* vik_trw_layer_tpwin_set_tp:
* @tpwin: The Trackpoint Edit Window
* @tpl: The #Glist of trackpoints pointing at the current trackpoint
* @track_name: The name of the track in which the trackpoint belongs
* @is_route: Is the track of the trackpoint actually a route?
*
* Sets the Trackpoint Edit Window to the values of the current trackpoint given in @tpl.
*
*/
void vik_trw_layer_tpwin_set_tp ( VikTrwLayerTpwin *tpwin, GList *tpl, const gchar *track_name, gboolean is_route )
{
static char tmp_str[64];
static struct LatLon ll;
VikTrackpoint *tp = VIK_TRACKPOINT(tpl->data);
if ( tp->name )
gtk_entry_set_text ( GTK_ENTRY(tpwin->trkpt_name), tp->name );
else
gtk_editable_delete_text ( GTK_EDITABLE(tpwin->trkpt_name), 0, -1 );
gtk_widget_set_sensitive ( tpwin->trkpt_name, TRUE );
/* Only can insert if not at the end (otherwise use extend track) */
gtk_widget_set_sensitive ( tpwin->button_insert, (gboolean) GPOINTER_TO_INT (tpl->next) );
gtk_widget_set_sensitive ( tpwin->button_delete, TRUE );
/* We can only split up a track if it's not an endpoint. Makes sense to me. */
gtk_widget_set_sensitive ( tpwin->button_split, tpl->next && tpl->prev );
gtk_widget_set_sensitive ( tpwin->button_forward, (gboolean) GPOINTER_TO_INT (tpl->next) );
gtk_widget_set_sensitive ( tpwin->button_back, (gboolean) GPOINTER_TO_INT (tpl->prev) );
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->lat), TRUE );
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->lon), TRUE );
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->alt), TRUE );
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->ts), tp->has_timestamp );
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->time), tp->has_timestamp );
// Enable adding timestamps - but not on routepoints
if ( !tp->has_timestamp && !is_route ) {
gtk_widget_set_sensitive ( GTK_WIDGET(tpwin->time), TRUE );
GtkWidget *img = gtk_image_new_from_stock ( GTK_STOCK_ADD, GTK_ICON_SIZE_MENU );
gtk_button_set_image ( GTK_BUTTON(tpwin->time), img );
}
else
vik_trw_layer_tpwin_set_track_name ( tpwin, track_name );
tpwin->sync_to_tp_block = TRUE; /* don't update while setting data. */
vik_coord_to_latlon ( &(tp->coord), &ll );
gtk_spin_button_set_value ( tpwin->lat, ll.lat );
gtk_spin_button_set_value ( tpwin->lon, ll.lon );
vik_units_height_t height_units = a_vik_get_units_height ();
switch (height_units) {
case VIK_UNITS_HEIGHT_METRES:
gtk_spin_button_set_value ( tpwin->alt, tp->altitude );
break;
case VIK_UNITS_HEIGHT_FEET:
gtk_spin_button_set_value ( tpwin->alt, VIK_METERS_TO_FEET(tp->altitude) );
break;
default:
gtk_spin_button_set_value ( tpwin->alt, tp->altitude );
g_critical("Houston, we've had a problem. height=%d", height_units);
}
tpwin_update_times ( tpwin, tp );
tpwin->sync_to_tp_block = FALSE; // don't update while setting data.
vik_units_speed_t speed_units = a_vik_get_units_speed ();
vik_units_distance_t dist_units = a_vik_get_units_distance ();
if ( tpwin->cur_tp )
{
switch (dist_units) {
case VIK_UNITS_DISTANCE_KILOMETRES:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f m", vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)));
break;
case VIK_UNITS_DISTANCE_MILES:
case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f yards", vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord))*1.0936133);
break;
default:
g_critical("Houston, we've had a problem. distance=%d", dist_units);
}
gtk_label_set_text ( tpwin->diff_dist, tmp_str );
if ( tp->has_timestamp && tpwin->cur_tp->has_timestamp )
{
g_snprintf ( tmp_str, sizeof(tmp_str), "%ld s", tp->timestamp - tpwin->cur_tp->timestamp);
gtk_label_set_text ( tpwin->diff_time, tmp_str );
if ( tp->timestamp == tpwin->cur_tp->timestamp )
gtk_label_set_text ( tpwin->diff_speed, "--" );
else
{
switch (speed_units) {
case VIK_UNITS_SPEED_KILOMETRES_PER_HOUR:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f km/h", VIK_MPS_TO_KPH(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_MILES_PER_HOUR:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f mph", VIK_MPS_TO_MPH(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_METRES_PER_SECOND:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f m/s", vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / ABS(tp->timestamp - tpwin->cur_tp->timestamp) );
break;
case VIK_UNITS_SPEED_KNOTS:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f knots", VIK_MPS_TO_KNOTS(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_SECONDS_PER_KM:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f s/km", VIK_MPS_TO_PACE_SPK(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_MINUTES_PER_KM:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f min/km", VIK_MPS_TO_PACE_MPK(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_SECONDS_PER_MILE:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f sec/mi", VIK_MPS_TO_PACE_SPM(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
case VIK_UNITS_SPEED_MINUTES_PER_MILE:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f min/mi", VIK_MPS_TO_PACE_MPM(vik_coord_diff(&(tp->coord), &(tpwin->cur_tp->coord)) / (ABS(tp->timestamp - tpwin->cur_tp->timestamp))) );
break;
default:
g_snprintf ( tmp_str, sizeof(tmp_str), "--" );
g_critical("Houston, we've had a problem. speed=%d", speed_units);
}
gtk_label_set_text ( tpwin->diff_speed, tmp_str );
}
}
else
{
gtk_label_set_text ( tpwin->diff_time, NULL );
gtk_label_set_text ( tpwin->diff_speed, NULL );
}
}
if ( isnan(tp->course) )
g_snprintf ( tmp_str, sizeof(tmp_str), "--" );
else
g_snprintf ( tmp_str, sizeof(tmp_str), "%05.1f\302\260", tp->course );
gtk_label_set_text ( tpwin->course, tmp_str );
if ( isnan(tp->speed) )
g_snprintf ( tmp_str, sizeof(tmp_str), "--" );
else {
switch (speed_units) {
case VIK_UNITS_SPEED_MILES_PER_HOUR:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f mph", VIK_MPS_TO_MPH(tp->speed) );
break;
case VIK_UNITS_SPEED_METRES_PER_SECOND:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f m/s", tp->speed );
break;
case VIK_UNITS_SPEED_KNOTS:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f knots", VIK_MPS_TO_KNOTS(tp->speed) );
break;
case VIK_UNITS_SPEED_SECONDS_PER_KM:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f s/km", VIK_MPS_TO_PACE_SPK(tp->speed) );
break;
case VIK_UNITS_SPEED_MINUTES_PER_KM:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f min/km", VIK_MPS_TO_PACE_MPK(tp->speed) );
break;
case VIK_UNITS_SPEED_SECONDS_PER_MILE:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f s/mi", VIK_MPS_TO_PACE_SPM(tp->speed) );
break;
case VIK_UNITS_SPEED_MINUTES_PER_MILE:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f min/mi", VIK_MPS_TO_PACE_MPM(tp->speed) );
break;
default:
// VIK_UNITS_SPEED_KILOMETRES_PER_HOUR:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.2f km/h", VIK_MPS_TO_KPH(tp->speed) );
break;
}
}
gtk_label_set_text ( tpwin->speed, tmp_str );
switch (dist_units) {
case VIK_UNITS_DISTANCE_KILOMETRES:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f m", tp->hdop );
gtk_label_set_text ( tpwin->hdop, tmp_str );
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f m", tp->pdop );
gtk_label_set_text ( tpwin->pdop, tmp_str );
break;
case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
case VIK_UNITS_DISTANCE_MILES:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f yards", tp->hdop*1.0936133 );
gtk_label_set_text ( tpwin->hdop, tmp_str );
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f yards", tp->pdop*1.0936133 );
gtk_label_set_text ( tpwin->pdop, tmp_str );
break;
default:
g_critical("Houston, we've had a problem. distance=%d", dist_units);
}
switch (height_units) {
case VIK_UNITS_HEIGHT_METRES:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f m", tp->vdop );
break;
case VIK_UNITS_HEIGHT_FEET:
g_snprintf ( tmp_str, sizeof(tmp_str), "%.5f feet", VIK_METERS_TO_FEET(tp->vdop) );
break;
default:
g_snprintf ( tmp_str, sizeof(tmp_str), "--" );
g_critical("Houston, we've had a problem. height=%d", height_units);
}
gtk_label_set_text ( tpwin->vdop, tmp_str );
g_snprintf ( tmp_str, sizeof(tmp_str), "%d / %d", tp->nsats, tp->fix_mode );
gtk_label_set_text ( tpwin->sat, tmp_str );
tpwin->cur_tp = tp;
}
/**
* vu_trackpoint_formatted_message:
* @format_code: String describing the message to generate
* @trkpt: The trackpoint for which the message is generated about
* @trkpt_prev: A trackpoint (presumed previous) for interpolating values with the other trackpoint (such as speed)
* @trk: The track in which the trackpoints reside
*
* TODO: One day replace this cryptic format code with some kind of tokenizer parsing
* thus would make it more user friendly and maybe even GUI controlable.
* However for now at least there is some semblance of user control
*/
gchar* vu_trackpoint_formatted_message ( gchar *format_code, VikTrackpoint *trkpt, VikTrackpoint *trkpt_prev, VikTrack *trk )
{
if ( !trkpt )
return NULL;
gint len = 0;
if ( format_code )
len = strlen ( format_code );
if ( len > FMT_MAX_NUMBER_CODES )
len = FMT_MAX_NUMBER_CODES;
gchar* values[FMT_MAX_NUMBER_CODES];
int i;
for ( i = 0; i < FMT_MAX_NUMBER_CODES; i++ ) {
values[i] = '\0';
}
gchar *speed_units_str = NULL;
vik_units_speed_t speed_units = a_vik_get_units_speed ();
switch (speed_units) {
case VIK_UNITS_SPEED_MILES_PER_HOUR:
speed_units_str = g_strdup ( _("mph") );
break;
case VIK_UNITS_SPEED_METRES_PER_SECOND:
speed_units_str = g_strdup ( _("m/s") );
break;
case VIK_UNITS_SPEED_KNOTS:
speed_units_str = g_strdup ( _("knots") );
break;
default:
// VIK_UNITS_SPEED_KILOMETRES_PER_HOUR:
speed_units_str = g_strdup ( _("km/h") );
break;
}
gchar *separator = g_strdup ( " | " );
for ( i = 0; i < len; i++ ) {
switch ( g_ascii_toupper ( format_code[i] ) ) {
case 'G': values[i] = g_strdup ( _("GPSD") ); break; // GPS Preamble
case 'K': values[i] = g_strdup ( _("Trkpt") ); break; // Trkpt Preamble
case 'S': {
gdouble speed = 0.0;
gchar *speedtype = NULL;
if ( isnan(trkpt->speed) && trkpt_prev ) {
if ( trkpt->has_timestamp && trkpt_prev->has_timestamp ) {
if ( trkpt->timestamp == trkpt_prev->timestamp ) {
// Work out from previous trackpoint location and time difference
speed = vik_coord_diff(&(trkpt->coord), &(trkpt_prev->coord)) / ABS(trkpt->timestamp - trkpt_prev->timestamp);
switch (speed_units) {
case VIK_UNITS_SPEED_KILOMETRES_PER_HOUR:
speed = VIK_MPS_TO_KPH(speed);
break;
case VIK_UNITS_SPEED_MILES_PER_HOUR:
speed = VIK_MPS_TO_MPH(speed);
break;
case VIK_UNITS_SPEED_KNOTS:
speed = VIK_MPS_TO_KNOTS(speed);
break;
default:
// VIK_UNITS_SPEED_METRES_PER_SECOND:
// Already in m/s so nothing to do
break;
}
speedtype = g_strdup ( "*" ); // Interpolated
}
else
speedtype = g_strdup ( "**" );
}
else
speedtype = g_strdup ( "**" );
}
else {
speed = trkpt->speed;
speedtype = g_strdup ( "" );
}
values[i] = g_strdup_printf ( _("%sSpeed%s %.1f%s"), separator, speedtype, speed, speed_units_str );
g_free ( speedtype );
break;
}
case 'A': {
vik_units_height_t height_units = a_vik_get_units_height ();
switch (height_units) {
case VIK_UNITS_HEIGHT_FEET:
values[i] = g_strdup_printf ( _("%sAlt %dfeet"), separator, (int)round(VIK_METERS_TO_FEET(trkpt->altitude)) );
break;
default:
//VIK_UNITS_HEIGHT_METRES:
values[i] = g_strdup_printf ( _("%sAlt %dm"), separator, (int)round(trkpt->altitude) );
break;
}
break;
}
case 'C': {
gint heading = isnan(trkpt->course) ? 0 : (gint)round(trkpt->course);
values[i] = g_strdup_printf ( _("%sCourse %03d\302\260" ), separator, heading );
break;
}
case 'P': {
if ( trkpt_prev ) {
gint diff = (gint) round ( vik_coord_diff ( &(trkpt->coord), &(trkpt_prev->coord) ) );
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 ( _("yards") );
break;
default:
// VIK_UNITS_DISTANCE_KILOMETRES:
dist_units_str = g_strdup ( _("m") );
break;
}
values[i] = g_strdup_printf ( _("%sDistance diff %d%s"), separator, diff, dist_units_str );
g_free ( dist_units_str );
}
break;
}
case 'T': {
gchar tmp[64];
tmp[0] = '\0';
if ( trkpt->has_timestamp ) {
// Compact date time format
strftime (tmp, sizeof(tmp), "%x %X", localtime(&(trkpt->timestamp)));
}
else
g_snprintf (tmp, sizeof(tmp), "--");
values[i] = g_strdup_printf ( _("%sTime %s"), separator, tmp );
break;
}
case 'M': {
if ( trkpt_prev ) {
if ( trkpt->has_timestamp && trkpt_prev->has_timestamp ) {
time_t t_diff = trkpt->timestamp - trkpt_prev->timestamp;
values[i] = g_strdup_printf ( _("%sTime diff %lds"), separator, t_diff );
}
}
break;
}
case 'X': values[i] = g_strdup_printf ( _("%sNo. of Sats %d"), separator, trkpt->nsats ); 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;
default:
// VIK_UNITS_DISTANCE_KILOMETRES:
dist_units_str = g_strdup ( _("km") );
distd = distd / 1000.0;
break;
}
values[i] = g_strdup_printf ( _("%sDistance along %.2f%s"), separator, distd, dist_units_str );
g_free ( dist_units_str );
}
break;
}
case 'L': {
// Location (Lat/Long)
gchar *lat = NULL, *lon = NULL;
struct LatLon ll;
vik_coord_to_latlon (&(trkpt->coord), &ll);
a_coords_latlon_to_string ( &ll, &lat, &lon );
values[i] = g_strdup_printf ( "%s%s %s", separator, lat, lon );
g_free ( lat );
g_free ( lon );
break;
}
case 'N': // Name of track
values[i] = g_strdup_printf ( _("%sTrack: %s"), separator, trk->name );
break;
case 'E': // Name of trackpoint if available
if ( trkpt->name )
values[i] = g_strdup_printf ( "%s%s", separator, trkpt->name );
else
values[i] = g_strdup ( "" );
break;
default:
break;
}
}
g_free ( separator );
g_free ( speed_units_str );
gchar *msg = g_strconcat ( values[0], values[1], values[2], values[3], values[4], values[5], values[6], values[7], values[8], NULL );
for ( i = 0; i < FMT_MAX_NUMBER_CODES; i++ ) {
if ( values[i] != '\0' )
g_free ( values[i] );
}
return msg;
}
/**
* Make a speed/distance map
*/
gdouble *vik_track_make_speed_dist_map ( const VikTrack *tr, guint16 num_chunks )
{
gdouble *v, *s, *t;
time_t t1, t2;
gint i, pt_count, numpts, index;
GList *iter;
gdouble duration, total_length, chunk_length;
if ( ! tr->trackpoints )
return NULL;
t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp;
t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp;
duration = t2 - t1;
if ( !t1 || !t2 || !duration )
return NULL;
if (duration < 0) {
g_warning("negative duration: unsorted trackpoint timestamps?");
return NULL;
}
total_length = vik_track_get_length_including_gaps ( tr );
chunk_length = total_length / num_chunks;
pt_count = vik_track_get_tp_count(tr);
if (chunk_length <= 0) {
return NULL;
}
v = g_malloc ( sizeof(gdouble) * num_chunks );
s = g_malloc ( sizeof(double) * pt_count );
t = g_malloc ( sizeof(double) * pt_count );
// No special handling of segments ATM...
iter = tr->trackpoints->next;
numpts = 0;
s[0] = 0;
t[0] = VIK_TRACKPOINT(iter->prev->data)->timestamp;
numpts++;
while (iter) {
s[numpts] = s[numpts-1] + vik_coord_diff ( &(VIK_TRACKPOINT(iter->prev->data)->coord), &(VIK_TRACKPOINT(iter->data)->coord) );
t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp;
numpts++;
iter = iter->next;
}
// Iterate through a portion of the track to get an average speed for that part
// This will essentially interpolate between segments, which I think is right given the usage of 'get_length_including_gaps'
index = 0; /* index of the current trackpoint. */
for (i = 0; i < num_chunks; i++) {
// Similar to the make_speed_map, but instead of using a time chunk, use a distance chunk
if (s[0] + i*chunk_length >= s[index]) {
gdouble acc_t = 0, acc_s = 0;
while (s[0] + i*chunk_length >= s[index]) {
acc_s += (s[index+1]-s[index]);
acc_t += (t[index+1]-t[index]);
index++;
}
v[i] = acc_s/acc_t;
}
else if (i) {
v[i] = v[i-1];
}
else {
v[i] = 0;
}
}
g_free(s);
g_free(t);
return v;
}
/**
* Make a distance/time map, heavily based on the vik_track_make_speed_map method
*/
gdouble *vik_track_make_distance_map ( const VikTrack *tr, guint16 num_chunks )
{
gdouble *v, *s, *t;
gdouble duration, chunk_dur;
time_t t1, t2;
int i, pt_count, numpts, index;
GList *iter;
if ( ! tr->trackpoints )
return NULL;
t1 = VIK_TRACKPOINT(tr->trackpoints->data)->timestamp;
t2 = VIK_TRACKPOINT(g_list_last(tr->trackpoints)->data)->timestamp;
duration = t2 - t1;
if ( !t1 || !t2 || !duration )
return NULL;
if (duration < 0) {
g_warning("negative duration: unsorted trackpoint timestamps?");
return NULL;
}
pt_count = vik_track_get_tp_count(tr);
v = g_malloc ( sizeof(gdouble) * num_chunks );
chunk_dur = duration / num_chunks;
s = g_malloc(sizeof(double) * pt_count);
t = g_malloc(sizeof(double) * pt_count);
iter = tr->trackpoints->next;
numpts = 0;
s[0] = 0;
t[0] = VIK_TRACKPOINT(iter->prev->data)->timestamp;
numpts++;
while (iter) {
s[numpts] = s[numpts-1] + vik_coord_diff ( &(VIK_TRACKPOINT(iter->prev->data)->coord), &(VIK_TRACKPOINT(iter->data)->coord) );
t[numpts] = VIK_TRACKPOINT(iter->data)->timestamp;
numpts++;
iter = iter->next;
}
/* In the following computation, we iterate through periods of time of duration chunk_dur.
* The first period begins at the beginning of the track. The last period ends at the end of the track.
*/
index = 0; /* index of the current trackpoint. */
for (i = 0; i < num_chunks; i++) {
/* we are now covering the interval from t[0] + i*chunk_dur to t[0] + (i+1)*chunk_dur.
* find the first trackpoint outside the current interval, averaging the distance between intermediate trackpoints.
*/
if (t[0] + i*chunk_dur >= t[index]) {
gdouble acc_s = 0; // No need for acc_t
while (t[0] + i*chunk_dur >= t[index]) {
acc_s += (s[index+1]-s[index]);
index++;
}
// The only bit that's really different from the speed map - just keep an accululative record distance
v[i] = i ? v[i-1]+acc_s : acc_s;
}
else if (i) {
v[i] = v[i-1];
}
else {
v[i] = 0;
}
}
g_free(s);
g_free(t);
return v;
}
/* I understood this when I wrote it ... maybe ... Basically it eats up the
* proper amounts of length on the track and averages elevation over that. */
gdouble *vik_track_make_elevation_map ( const VikTrack *tr, guint16 num_chunks )
{
gdouble *pts;
gdouble total_length, chunk_length, current_dist, current_area_under_curve, current_seg_length, dist_along_seg = 0.0;
gdouble altitude1, altitude2;
guint16 current_chunk;
gboolean ignore_it = FALSE;
GList *iter = tr->trackpoints;
if (!iter || !iter->next) /* zero- or one-point track */
return NULL;
{ /* test if there's anything worth calculating */
gboolean okay = FALSE;
while ( iter )
{
if ( VIK_TRACKPOINT(iter->data)->altitude != VIK_DEFAULT_ALTITUDE ) {
okay = TRUE; break;
}
iter = iter->next;
}
if ( ! okay )
return NULL;
}
iter = tr->trackpoints;
g_assert ( num_chunks < 16000 );
pts = g_malloc ( sizeof(gdouble) * num_chunks );
total_length = vik_track_get_length_including_gaps ( tr );
chunk_length = total_length / num_chunks;
/* Zero chunk_length (eg, track of 2 tp with the same loc) will cause crash */
if (chunk_length <= 0) {
g_free(pts);
return NULL;
}
current_dist = 0.0;
current_area_under_curve = 0;
current_chunk = 0;
current_seg_length = 0;
current_seg_length = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord),
&(VIK_TRACKPOINT(iter->next->data)->coord) );
altitude1 = VIK_TRACKPOINT(iter->data)->altitude;
altitude2 = VIK_TRACKPOINT(iter->next->data)->altitude;
dist_along_seg = 0;
while ( current_chunk < num_chunks ) {
/* go along current seg */
if ( current_seg_length && (current_seg_length - dist_along_seg) > chunk_length ) {
dist_along_seg += chunk_length;
/* /
* pt2 *
* /x altitude = alt_at_pt_1 + alt_at_pt_2 / 2 = altitude1 + slope * dist_value_of_pt_inbetween_pt1_and_pt2
* /xx avg altitude = area under curve / chunk len
*pt1 *xxx avg altitude = altitude1 + (altitude2-altitude1)/(current_seg_length)*(dist_along_seg + (chunk_len/2))
* / xxx
* / xxx
**/
if ( ignore_it )
// Seemly can't determine average for this section - so use last known good value (much better than just sticking in zero)
pts[current_chunk] = altitude1;
else
pts[current_chunk] = altitude1 + (altitude2-altitude1)*((dist_along_seg - (chunk_length/2))/current_seg_length);
current_chunk++;
} else {
/* finish current seg */
if ( current_seg_length ) {
gdouble altitude_at_dist_along_seg = altitude1 + (altitude2-altitude1)/(current_seg_length)*dist_along_seg;
current_dist = current_seg_length - dist_along_seg;
current_area_under_curve = current_dist*(altitude_at_dist_along_seg + altitude2)*0.5;
} else { current_dist = current_area_under_curve = 0; } /* should only happen if first current_seg_length == 0 */
/* get intervening segs */
iter = iter->next;
while ( iter && iter->next ) {
current_seg_length = vik_coord_diff ( &(VIK_TRACKPOINT(iter->data)->coord),
&(VIK_TRACKPOINT(iter->next->data)->coord) );
altitude1 = VIK_TRACKPOINT(iter->data)->altitude;
altitude2 = VIK_TRACKPOINT(iter->next->data)->altitude;
ignore_it = VIK_TRACKPOINT(iter->next->data)->newsegment;
if ( chunk_length - current_dist >= current_seg_length ) {
current_dist += current_seg_length;
current_area_under_curve += current_seg_length * (altitude1+altitude2) * 0.5;
iter = iter->next;
} else {
break;
}
}
/* final seg */
dist_along_seg = chunk_length - current_dist;
if ( ignore_it || ( iter && !iter->next ) ) {
pts[current_chunk] = current_area_under_curve / current_dist;
if (!iter->next) {
int i;
for (i = current_chunk + 1; i < num_chunks; i++)
pts[i] = pts[current_chunk];
break;
}
}
else {
current_area_under_curve += dist_along_seg * (altitude1 + (altitude2 - altitude1)*dist_along_seg/current_seg_length);
pts[current_chunk] = current_area_under_curve / chunk_length;
}
current_dist = 0;
current_chunk++;
}
}
return pts;
}
void vik_viewport_draw_scale ( VikViewport *vvp )
{
g_return_if_fail ( vvp != NULL );
if ( vvp->draw_scale ) {
VikCoord left, right;
gdouble unit, base, diff, old_unit, old_diff, ratio;
gint odd, len, SCSIZE = 5, HEIGHT=10;
PangoLayout *pl;
gchar s[128];
vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
vik_units_distance_t dist_units = a_vik_get_units_distance ();
switch (dist_units) {
case VIK_UNITS_DISTANCE_KILOMETRES:
base = vik_coord_diff ( &left, &right ); // in meters
break;
case VIK_UNITS_DISTANCE_MILES:
// in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
break;
default:
base = 1; // Keep the compiler happy
g_critical("Houston, we've had a problem. distance=%d", dist_units);
}
ratio = (vvp->width/SCSIZE)/base;
unit = 1;
diff = fabs(base-unit);
old_unit = unit;
old_diff = diff;
odd = 1;
while (diff <= old_diff) {
old_unit = unit;
old_diff = diff;
unit = unit * (odd%2 ? 5 : 2);
diff = fabs(base-unit);
odd++;
}
unit = old_unit;
len = unit * ratio;
/* white background */
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
/* black scale */
vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
if (odd%2) {
int i;
for (i=1; i<5; i++) {
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
}
} else {
int i;
for (i=1; i<10; i++) {
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
}
}
pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
switch (dist_units) {
case VIK_UNITS_DISTANCE_KILOMETRES:
if (unit >= 1000) {
sprintf(s, "%d km", (int)unit/1000);
} else {
sprintf(s, "%d m", (int)unit);
}
break;
case VIK_UNITS_DISTANCE_MILES:
// Handle units in 0.1 miles
if (unit < 10.0) {
sprintf(s, "%0.1f miles", unit/10.0);
}
else if ((int)unit == 10.0) {
sprintf(s, "1 mile");
}
else {
sprintf(s, "%d miles", (int)(unit/10.0));
}
break;
default:
g_critical("Houston, we've had a problem. distance=%d", dist_units);
}
pango_layout_set_text(pl, s, -1);
vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD + len + PAD, vvp->height - PAD - 10, pl);
g_object_unref(pl);
pl = NULL;
}
}
