mappix/mappix-trackedit.c

/*
 *  mappix-trackedit.c
 *
 *  Copyright (C) 2006 Nils Faerber <nils.faerber@kernelconcepts.de>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 

#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "mappix.h"
#include "geo-dist.h"
#include "geo-tools.h"


/*
 * takes head of a track
 * returns number of data points in a track
 */
static gint
track_get_number_of_points(track_head *track)
{
GList *lp;
gint pcount=0;

	lp = track->track;
	while ((lp = g_list_next(lp))) {
		pcount++;
	}

return pcount;
}


/*
 * takes head of a track
 * returns total length of a track in meters
 */
double
track_get_length(track_head *track)
{
gdouble plat, plong;
gdouble olat, olong;
trackdata *tdata;
GList *lp;
double dist=0.;
double tdist=0.;

	lp = track->track;
	tdata = (trackdata *)lp->data;
	unit2latlon(tdata->unitx, tdata->unity, olat, olong);
	while ((lp = g_list_next(lp))) {
		tdata = (trackdata *)lp->data;
		unit2latlon(tdata->unitx, tdata->unity, plat, plong);
		dist = dist_ell(olat, olong, plat, plong, WGS84);
		if (!isnan(dist)) {
			tdist += dist;
		}
		olat = plat;
		olong = plong;
	}
	tdist *= NAUTICAL_MILE;

return tdist;
}


/*
 * takes head of a track
 * returns mean distance between two data points in meters
 */
double
track_get_mean_pointdistance(track_head *track)
{
gdouble dist;
gint pcount;
gdouble mdist;

	dist = track_get_length(track);
	pcount = track_get_number_of_points(track);
	mdist = (dist / (double)pcount) * 1000.;
	// fprintf(stderr, "total data points in track = %d\ntotal tracklength = %lf km\nmean distance = %lf m\n", pcount, tdist, mdist);

return mdist;
}


void
track_add_new_to_main(mapwin *Mapper, track_head *track)
{
GtkListStore *store;
GtkTreeIter iter;

	g_list_foreach(track->track, track_find_minmax, track);
	Mapper->tracklist = g_list_prepend(Mapper->tracklist, track);
	store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW(Mapper->track_treeview)));
	gtk_list_store_append (store, &iter);
	if (g_str_has_suffix(track->name, ".gpx"))
		track->name[strlen(track->name)-4] = 0;
	gtk_list_store_set (store, &iter, 0, track->show, 1, g_path_get_basename(track->name), 2, track, -1);
}


/* calculate distance from point to next point,
 * if actual distance > dist then create new track:
 *   cut old track at current position,
 *   end old track here,
 *   start new track at next point
 */
static int
do_auto_split_track(mapwin *Mapper, track_head *track, gint dist)
{
gdouble olat, olong;
gdouble plat, plong;
trackdata *tdata;
GList *lp;
gint pcount=0;
double pdist=0.;
track_head *split_track;
trackdata *split_track_data;

	lp = track->track;
	tdata = (trackdata *)lp->data;
	unit2latlon(tdata->unitx, tdata->unity, olat, olong);

	split_track = (track_head *)malloc(sizeof(track_head));
	split_track->name = g_strdup_printf("%s-%03d", track->name, pcount);
	split_track->type = track->type;
	split_track->show = TRUE;
	split_track->track = NULL;
	split_track->xmin = WORLD_SIZE_UNITS;
	split_track->ymin = WORLD_SIZE_UNITS;
	split_track->xmax = 0;
	split_track->ymax = 0;

	while ((lp = g_list_next(lp))) {
		tdata = (trackdata *)lp->data;
		split_track_data = (trackdata *)malloc(sizeof(trackdata));
		memcpy(split_track_data, tdata, sizeof(trackdata));
		unit2latlon(tdata->unitx, tdata->unity, plat, plong);
		pdist = dist_ell(olat, olong, plat, plong, WGS84);
		pdist *= NAUTICAL_MILE * 1000.;
		if (pdist > dist) {
			pcount++;
			track_add_new_to_main(Mapper, split_track);

			split_track = (track_head *)malloc(sizeof(track_head));
			split_track->name = g_strdup_printf("%s-%03d", track->name, pcount);
			split_track->type = track->type;
			split_track->show = TRUE;
			split_track->track = NULL;
			split_track->xmin = WORLD_SIZE_UNITS;
			split_track->ymin = WORLD_SIZE_UNITS;
			split_track->xmax = 0;
			split_track->ymax = 0;
			split_track->track = g_list_prepend(split_track->track, split_track_data);
		} else {
			split_track->track = g_list_prepend(split_track->track, split_track_data);
		}
		olat = plat;
		olong = plong;
	}
	track_add_new_to_main(Mapper, split_track);
	// fprintf(stderr, "would split into %d new tracks\n", pcount);

return 0;
}


void
track_find_minmax(gpointer data, gpointer user_data)
{
trackdata *tdata = (trackdata *)data;
track_head *ntrack = (track_head *)user_data;

	if (tdata->unitx > ntrack->xmax)
		ntrack->xmax = tdata->unitx;
	if (tdata->unitx < ntrack->xmin)
		ntrack->xmin = tdata->unitx;
	if (tdata->unity > ntrack->ymax)
		ntrack->ymax = tdata->unity;
	if (tdata->unity < ntrack->ymin)
		ntrack->ymin = tdata->unity;
}


gboolean
get_selected_track (GtkTreeModel **tree_model, GtkTreeIter *iter, mapwin *Mapper)
{
GtkTreeSelection *tree_selection;
GtkWidget *dialog;

	tree_selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(Mapper->track_treeview));
	if (!gtk_tree_selection_get_selected(tree_selection, tree_model, iter)) {
		// gtk_widget_destroy(dialog);
		dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_ERROR,
			GTK_BUTTONS_OK,
			"%s", "No track selected,\nselect a track first.");
		gtk_dialog_run(GTK_DIALOG(dialog));
		gtk_widget_hide (dialog);
		gtk_widget_destroy (dialog);
		return FALSE;
	}
	return TRUE;
}


static gint
do_auto_split_dialog(mapwin *Mapper, track_head **track, guint *dist)
{
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *stock;
GtkWidget *table;
GtkWidget *spinb_split_dist;
GtkWidget *label;
GtkWidget *w;
gint result;
GtkTreeModel *tree_model;
GtkTreeIter iter;
gchar *tname;
track_head *trackh;
gdouble mean_dist;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return -1;

	dialog = gtk_dialog_new_with_buttons("Auto Split Track", GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_STOCK_OK,
			GTK_RESPONSE_ACCEPT,
			GTK_STOCK_CANCEL,
			GTK_RESPONSE_REJECT,
			NULL);

	hbox = gtk_hbox_new (FALSE, 8);
	gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
	gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

	stock = gtk_image_new_from_stock (GTK_STOCK_DIALOG_QUESTION, GTK_ICON_SIZE_DIALOG);
	gtk_box_pack_start (GTK_BOX (hbox), stock, FALSE, FALSE, 0);

	table = gtk_table_new (2, 4, FALSE);
	gtk_table_set_row_spacings (GTK_TABLE (table), 4);
	gtk_table_set_col_spacings (GTK_TABLE (table), 4);
	gtk_table_set_homogeneous(GTK_TABLE (table), FALSE);
	gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE, 0);

	label = gtk_label_new ("Track to split");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 0, 1);
	w = gtk_entry_new();
	gtk_table_attach_defaults (GTK_TABLE (table), w, 1, 2, 0, 1);
	gtk_entry_set_editable(GTK_ENTRY(w), FALSE);

	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);
	gtk_entry_set_text(GTK_ENTRY(w), tname);
	gtk_entry_set_max_length(GTK_ENTRY(w), strlen(tname) + 1);
	gtk_entry_set_width_chars(GTK_ENTRY(w), strlen(tname) + 1);

	mean_dist = track_get_mean_pointdistance(trackh);

	label = gtk_label_new ("Split Distance (m)\n(default: mean distance)");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 1, 2);

	spinb_split_dist = gtk_spin_button_new_with_range(0, 9999999, 1);
	gtk_spin_button_set_value(GTK_SPIN_BUTTON(spinb_split_dist), mean_dist);
	gtk_table_attach_defaults (GTK_TABLE (table), spinb_split_dist, 1, 2, 1, 2);
  
	gtk_widget_show_all (hbox);

	result = gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_hide (dialog);

	switch (result) {
		case GTK_RESPONSE_ACCEPT:
			*dist = gtk_spin_button_get_value(GTK_SPIN_BUTTON(spinb_split_dist));
			*track = trackh;
			break;
		default:
			break;
	}
	gtk_widget_destroy (dialog);

return result;
}


void
on_auto_split (GtkButton *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
track_head *track;
guint dist;
gint result;

	track = NULL;
	dist = 0;
	result = do_auto_split_dialog(Mapper, &track, &dist);
	if (result == -1 || result == GTK_RESPONSE_REJECT)
		return;
	// fprintf(stderr, "split: track '%s' if dist > %dm\n", track->name, dist);
	do_auto_split_track(Mapper, track, dist);
}


/* split the selected track at the selected postion
 * into one new track and the rest of the other
 * split-point will be duplicated, original track will be preserved
 */
void
on_split_track (GtkToolButton *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
track_head *track;
GtkTreeModel *tree_model;
GtkTreeIter iter;
gchar *tname;
trackdata *tdata;
GList *lp;
gint pcount=0;
track_head *split_track;
trackdata *split_track_data;


	if (!get_selected_track(&tree_model, &iter, Mapper))
		return;
	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &track, -1);

	lp = track->track;
	while ((lp = g_list_next(lp))) {
		tdata = (trackdata *)lp->data;
		if (tdata->selected)
			break;
	}
	if (!lp) {
		GtkWidget *dialog;

		dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_ERROR,
			GTK_BUTTONS_OK,
			"%s", "No selected split-point,\non selected track.");
		gtk_dialog_run(GTK_DIALOG(dialog));
		gtk_widget_hide (dialog);
		gtk_widget_destroy (dialog);

		return;
	}

	lp = track->track;
	tdata = (trackdata *)lp->data;

	split_track = (track_head *)malloc(sizeof(track_head));
	split_track->name = g_strdup_printf("%s-%03d", track->name, pcount);
	split_track->type = track->type;
	split_track->show = TRUE;
	split_track->track = NULL;
	split_track->xmin = WORLD_SIZE_UNITS;
	split_track->ymin = WORLD_SIZE_UNITS;
	split_track->xmax = 0;
	split_track->ymax = 0;

	while ((lp = g_list_next(lp))) {
		tdata = (trackdata *)lp->data;
		split_track_data = (trackdata *)malloc(sizeof(trackdata));
		memcpy(split_track_data, tdata, sizeof(trackdata));
		if (tdata->selected) {
			tdata->selected = FALSE;
			pcount++;
			split_track->track = g_list_prepend(split_track->track, split_track_data);
			track_add_new_to_main(Mapper, split_track);

			split_track = (track_head *)malloc(sizeof(track_head));
			split_track->name = g_strdup_printf("%s-%03d", track->name, pcount);
			split_track->type = track->type;
			split_track->show = TRUE;
			split_track->track = NULL;
			split_track->xmin = WORLD_SIZE_UNITS;
			split_track->ymin = WORLD_SIZE_UNITS;
			split_track->xmax = 0;
			split_track->ymax = 0;
			split_track_data = (trackdata *)malloc(sizeof(trackdata));
			memcpy(split_track_data, tdata, sizeof(trackdata));
			split_track->track = g_list_prepend(split_track->track, split_track_data);
		} else {
			split_track->track = g_list_prepend(split_track->track, split_track_data);
		}
	}
	track_add_new_to_main(Mapper, split_track);
	// fprintf(stderr, "would split into %d new tracks\n", pcount);
}


static void
delete_track_data(gpointer data, gpointer user_data)
{
trackdata *tdata = (trackdata *)data;

	g_free(tdata);
}


/* the calculated distance is not at all exact but serves
 * the purpose for greater, lower comparison
 */
static inline guint
dist_point_to_point(gint x1, gint y1, gint x2, gint y2)
{
guint dist;

	dist = ABS((gint)x2-(gint)x1) + ABS((gint)y2-(gint)y1);

return dist;
}


void
do_select_trackpoint(gint sx, gint sy, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GList *tracks, *track;
track_head *trackh;
trackdata *tdata, *least_tdata;
guint dist, least_dist;
gint x,y;

	/* find nearest trackpoint to pointer */
	least_dist = WORLD_SIZE_UNITS;
	least_tdata = NULL;
	if (Mapper->tracklist != NULL) {
		for (tracks=Mapper->tracklist; tracks; tracks=g_list_next(tracks)) {
			trackh = (track_head *)tracks->data;
			if (trackh->show) {
				if (trackh->xmax < Mapper->xoffset ||
					trackh->ymax < Mapper->yoffset ||
					trackh->xmin > (Mapper->xoffset + (Mapper->canvas_x / Mapper->scale)) ||
					trackh->ymin > (Mapper->yoffset + (Mapper->canvas_y / Mapper->scale))) {
					// fprintf(stderr, "not drawing track '%s'\n", trackh->name);
				} else {
					/* now search in this track */
					for (track=trackh->track; track; track=g_list_next(track)) {
						tdata = (trackdata *)track->data;
						dist = dist_point_to_point(sx, sy, tdata->unitx, tdata->unity);
						if (dist < least_dist) {
							least_dist = dist;
							least_tdata = tdata;
						}
					}
				}
			}
		}
	}
	if (least_tdata != NULL) {
		least_tdata->selected = ! least_tdata->selected;
		// draw_tracks(Mapper);
		x = (least_tdata->unitx - Mapper->xoffset) * Mapper->scale;
		y = (least_tdata->unity - Mapper->yoffset) * Mapper->scale;
		draw_marker(x, y, Mapper->marker_size, Mapper->marker_type | (least_tdata->selected ? MARKER_SELECTED : 0), Mapper);
		gtk_widget_queue_draw(Mapper->drawarea);
	}
}


void
do_trackpoint_region_select(gint sx1, gint sy1, guint sx2, guint sy2, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GList *tracks, *track;
track_head *trackh;
trackdata *tdata;
gint x,y;

	if (sx1 > sx2) {
		x=sx1;
		sx1=sx2;
		sx2=x;
	}
	if (sy1 > sy2) {
		y=sy1;
		sy1=sy2;
		sy2=y;
	}
	/* find trackpoints in boundary box */
	if (Mapper->tracklist != NULL) {
		for (tracks=Mapper->tracklist; tracks; tracks=g_list_next(tracks)) {
			trackh = (track_head *)tracks->data;
			if (trackh->show) {
				if (trackh->xmax < Mapper->xoffset ||
					trackh->ymax < Mapper->yoffset ||
					trackh->xmin > (Mapper->xoffset + (Mapper->canvas_x / Mapper->scale)) ||
					trackh->ymin > (Mapper->yoffset + (Mapper->canvas_y / Mapper->scale))) {
					// fprintf(stderr, "not drawing track '%s'\n", trackh->name);
				} else {
					/* now search in this track */
					for (track=trackh->track; track; track=g_list_next(track)) {
						tdata = (trackdata *)track->data;
						if (tdata->unitx >= sx1 && tdata->unitx <= sx2 &&
						    tdata->unity >= sy1 && tdata->unity <= sy2) {
						    	tdata->selected = ! tdata->selected;
							x = (tdata->unitx - Mapper->xoffset) * Mapper->scale;
							y = (tdata->unity - Mapper->yoffset) * Mapper->scale;
			/*XXX*/				draw_marker(x, y, Mapper->marker_size, Mapper->marker_type | (tdata->selected ? MARKER_SELECTED : 0), Mapper);
							gtk_widget_queue_draw(Mapper->drawarea);
						}
					}
				}
			}
		}
	}
}


void
do_move_trackpoint(gint sx, gint sy, gint ex, gint ey, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
gint moffset_x, moffset_y;
GList *tracks, *track;
track_head *trackh;
trackdata *tdata;

	moffset_x = ex - sx;
	moffset_y = ey - sy;

	if (Mapper->tracklist != NULL) {
		for (tracks=Mapper->tracklist; tracks; tracks=g_list_next(tracks)) {
			trackh = (track_head *)tracks->data;
			if (trackh->show) {
				if (trackh->xmax < Mapper->xoffset ||
					trackh->ymax < Mapper->yoffset ||
					trackh->xmin > (Mapper->xoffset + (Mapper->canvas_x / Mapper->scale)) ||
					trackh->ymin > (Mapper->yoffset + (Mapper->canvas_y / Mapper->scale))) {
					// fprintf(stderr, "not drawing track '%s'\n", trackh->name);
				} else {
					/* now search in this track */
					for (track=trackh->track; track; track=g_list_next(track)) {
						tdata = (trackdata *)track->data;
						if (tdata->selected) {
							tdata->unitx += moffset_x;
							tdata->unity += moffset_y;
						}
					}
				}
			}
		}
	}
	draw_tracks(Mapper);

}


void
on_select_trackpoint_cb(GtkToolButton *toolbutton, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;

	Mapper->toolmode = MAPPIX_TOOL_SELECT_TRACKPOINT;
}


void
on_select_region_cb(GtkToolButton *toolbutton, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;

	Mapper->toolmode = MAPPIX_TOOL_SELECT_REGION;
}


void
on_move_trackpoint_cb(GtkToolButton *toolbutton, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;

	Mapper->toolmode = MAPPIX_TOOL_MOVE_TRACKPOINT;
}


void
on_track_delete(GtkToolButton *toolbutton, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GtkWidget *dialog;
GtkTreeModel *tree_model;
GtkTreeIter iter;
track_head *trackh;
gchar *tname;
gint res;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return;
	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);

	dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
		GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
		GTK_MESSAGE_QUESTION,
		GTK_BUTTONS_YES_NO,
		"Are you sure you want to delete track\n%s", tname);
	res = gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_hide (dialog);
	gtk_widget_destroy (dialog);
	if (res != GTK_RESPONSE_YES) {
		return;
	}
	// fprintf(stderr, "would delete %s\n", tname);
	gtk_list_store_remove(GTK_LIST_STORE(tree_model), &iter);
	g_list_foreach(trackh->track, delete_track_data, NULL);
	g_list_free(trackh->track);
	Mapper->tracklist = g_list_remove(Mapper->tracklist, trackh);
	do_redraw(Mapper);
}


static void
track_delete_selected_nodes(track_head *trackh)
{
GList *track;
trackdata *tdata;

	for (track=trackh->track; track; track=g_list_next(track)) {
		tdata = (trackdata *)track->data;
		if (tdata->selected) {
			//track = g_list_remove(track, tdata);
			g_free(track->data);
			trackh->track = g_list_delete_link(trackh->track, track);
			track=trackh->track;
		}
	}
}


void
on_delete_nodes_cb(GtkToolButton *toolbutton, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GList *tracks; //, *track;
track_head *trackh;
// trackdata *tdata;

	if (Mapper->tracklist != NULL) {
		for (tracks=Mapper->tracklist; tracks; tracks=g_list_next(tracks)) {
			trackh = (track_head *)tracks->data;
			if (trackh->show) {
				if (trackh->xmax < Mapper->xoffset ||
					trackh->ymax < Mapper->yoffset ||
					trackh->xmin > (Mapper->xoffset + (Mapper->canvas_x / Mapper->scale)) ||
					trackh->ymin > (Mapper->yoffset + (Mapper->canvas_y / Mapper->scale))) {
					// fprintf(stderr, "not drawing track '%s'\n", trackh->name);
				} else {
					/* now search in this track */
					track_delete_selected_nodes(trackh);
				}
			}
		}
	}
	do_redraw(Mapper);
}


/* calculate distance from point to next point,
 * if actual distance > dist then create new track:
 *   cut old track at current position,
 *   end old track here,
 *   start new track at next point
 */
static int
do_thin_track(mapwin *Mapper, track_head *track, gint dist)
{
double olat, olong;
double plat, plong;
trackdata *tdata;
GList *lp;
double pdist=0.;
track_head *split_track;
trackdata *split_track_data;
gint pkept, pskip;
GtkWidget *dialog;

	lp = track->track;
	tdata = (trackdata *)lp->data;

	split_track = (track_head *)malloc(sizeof(track_head));
	split_track->name = g_strdup_printf("%s-thin-%d", track->name, dist);
	split_track->show = TRUE;
	split_track->track = NULL;
	split_track->xmin = WORLD_SIZE_UNITS;
	split_track->ymin = WORLD_SIZE_UNITS;
	split_track->xmax = 0;
	split_track->ymax = 0;

	pkept=0;
	pskip=0;

	split_track_data = (trackdata *)malloc(sizeof(trackdata));
	memcpy(split_track_data, tdata, sizeof(trackdata));
	split_track->track = g_list_prepend(split_track->track, split_track_data);
	unit2latlon(tdata->unitx, tdata->unity, olat, olong);
	lp = g_list_next(lp);
	while ((lp = g_list_next(lp))) {
		tdata = (trackdata *)lp->data;
		unit2latlon(tdata->unitx, tdata->unity, plat, plong);
		pdist = dist_ell(olat, olong, plat, plong, WGS84);
		pdist *= NAUTICAL_MILE * 1000.;
		if (pdist > dist) {
			split_track_data = (trackdata *)malloc(sizeof(trackdata));
			memcpy(split_track_data, tdata, sizeof(trackdata));
			split_track->track = g_list_prepend(split_track->track, split_track_data);
			olat = plat;
			olong = plong;
			pkept++;
		} else
			pskip++;
	}
	track_add_new_to_main(Mapper, split_track);
	// fprintf(stderr, "would split into %d new tracks\n", pcount);
	// g_message("kept %d points, skipped %d points", pkept, pskip);
	dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)), GTK_DIALOG_MODAL| GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_INFO, GTK_BUTTONS_OK, "Kept %d points,\nskipped %d points", pkept, pskip);
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_hide(dialog);
	gtk_widget_destroy(dialog);

return 0;
}


static gint
do_auto_thin_dialog(mapwin *Mapper, track_head **track, gint *dist)
{
GtkWidget *dialog;
GtkWidget *hbox;
GtkWidget *stock;
GtkWidget *table;
GtkWidget *spinb_split_dist;
GtkWidget *label;
GtkWidget *w;
gint result;
GtkTreeModel *tree_model;
GtkTreeIter iter;
gchar *tname;
track_head *trackh;
gdouble mean_dist;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return -1;
	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);

	dialog = gtk_dialog_new_with_buttons("Auto Thin Track", GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_STOCK_OK,
			GTK_RESPONSE_ACCEPT,
			GTK_STOCK_CANCEL,
			GTK_RESPONSE_REJECT,
			NULL);

	hbox = gtk_hbox_new (FALSE, 8);
	gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
	gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

	stock = gtk_image_new_from_stock (GTK_STOCK_DIALOG_QUESTION, GTK_ICON_SIZE_DIALOG);
	gtk_box_pack_start (GTK_BOX (hbox), stock, FALSE, FALSE, 0);

	table = gtk_table_new (2, 4, FALSE);
	gtk_table_set_row_spacings (GTK_TABLE (table), 4);
	gtk_table_set_col_spacings (GTK_TABLE (table), 4);
	gtk_table_set_homogeneous(GTK_TABLE (table), FALSE);
	gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE, 0);

	label = gtk_label_new ("Track to thin-out");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 0, 1);
	w = gtk_entry_new();
	gtk_table_attach_defaults (GTK_TABLE (table), w, 1, 2, 0, 1);
	gtk_entry_set_editable(GTK_ENTRY(w), FALSE);

	//gtk_combo_box_append_text(GTK_COMBO_BOX(track_combo), tname);
	gtk_entry_set_text(GTK_ENTRY(w), tname);
	gtk_entry_set_max_length(GTK_ENTRY(w), strlen(tname) + 1);
	gtk_entry_set_width_chars(GTK_ENTRY(w), strlen(tname) + 1);

	mean_dist = track_get_mean_pointdistance(trackh);

	label = gtk_label_new ("Minimum Distance (m)\n(default: mean distance)");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 1, 2);

	spinb_split_dist = gtk_spin_button_new_with_range(0, 9999, 1);
	gtk_spin_button_set_value(GTK_SPIN_BUTTON(spinb_split_dist), mean_dist);
	gtk_table_attach_defaults (GTK_TABLE (table), spinb_split_dist, 1, 2, 1, 2);
  
	gtk_widget_show_all (hbox);

	result = gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_hide (dialog);

	switch (result) {
		case GTK_RESPONSE_ACCEPT:
			*dist = gtk_spin_button_get_value(GTK_SPIN_BUTTON(spinb_split_dist));
			*track = trackh;
			break;
		default:
			break;
	}
	gtk_widget_destroy (dialog);

return result;
}


void
on_auto_thin (GtkButton *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
track_head *track;
gint dist;
gint result;

	track = NULL;
	dist = 0;
	result = do_auto_thin_dialog(Mapper, &track, &dist);
	if (result == -1 || result == GTK_RESPONSE_REJECT)
		return;
	// fprintf(stderr, "split: track '%s' if dist > %dm\n", track->name, dist);
	do_thin_track(Mapper, track, dist);
}


void
on_properties_track (GtkButton *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GtkWidget *dialog, *hbox, *stock, *table, *label, *entry_name, *entry_type;
GtkTreeModel *tree_model;
GtkTreeIter iter;
track_head *trackh;
gchar *tname;
const gchar *tmp_name;
gint result;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return;
	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);

	dialog = gtk_dialog_new_with_buttons("Rename track", GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_STOCK_OK,
			GTK_RESPONSE_ACCEPT,
			GTK_STOCK_CANCEL,
			GTK_RESPONSE_REJECT,
			NULL);

	hbox = gtk_hbox_new (FALSE, 8);
	gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
	gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

	stock = gtk_image_new_from_stock (GTK_STOCK_DIALOG_QUESTION, GTK_ICON_SIZE_DIALOG);
	gtk_box_pack_start (GTK_BOX (hbox), stock, FALSE, FALSE, 0);

	table = gtk_table_new (3, 4, FALSE);
	gtk_table_set_row_spacings (GTK_TABLE (table), 4);
	gtk_table_set_col_spacings (GTK_TABLE (table), 4);
	gtk_table_set_homogeneous(GTK_TABLE (table), FALSE);
	gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE, 0);

	label = gtk_label_new ("Track name");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 0, 1);
	// track_combo = gtk_combo_box_new_text();
	entry_name = gtk_entry_new();
	gtk_entry_set_text(GTK_ENTRY(entry_name), tname);
	gtk_entry_set_editable(GTK_ENTRY(entry_name), TRUE);
	gtk_table_attach_defaults (GTK_TABLE (table), entry_name, 1, 2, 0, 1);

	label = gtk_label_new ("Track type");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 1, 2);
	// track_combo = gtk_combo_box_new_text();
	entry_type = gtk_combo_box_new_text();
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Unknown");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Outline / Border");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "River");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Footpath");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Agricultural");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "City");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Urban");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Motorway");
	gtk_combo_box_append_text (GTK_COMBO_BOX(entry_type), "Highway");
	gtk_combo_box_set_active (GTK_COMBO_BOX(entry_type), trackh->type);
	gtk_table_attach_defaults (GTK_TABLE (table), entry_type, 1, 2, 1, 2);

	gtk_widget_show_all (hbox);

	result = gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_hide (dialog);

	switch (result) {
		case GTK_RESPONSE_ACCEPT:
			tmp_name = gtk_entry_get_text(GTK_ENTRY(entry_name));
			g_free(trackh->name);
			trackh->name = g_strdup(tmp_name);
			gtk_list_store_set(GTK_LIST_STORE(tree_model), &iter, 1, trackh->name, -1);
			if (trackh->type != gtk_combo_box_get_active(GTK_COMBO_BOX(entry_type))) {
				trackh->type = gtk_combo_box_get_active(GTK_COMBO_BOX(entry_type));
				draw_tracks(Mapper);
			}
			break;
		default:
			break;
	}
	gtk_widget_destroy (dialog);
}


/*
 * Simplify a track by judging the angle variation between trackpoints
 * takes head of a track, minimum angle difference, main Mapper struct
 * does not return a value
 *
 * Idea of operation:
 * We do not need to record trackpoints which are "lineary" aligned on a track.
 * That means if the direction of a track section does not change by more than a
 * minimum angle we assume that the previous direction continues and we can drop
 * the current trackpoint.
 * Assume four consequent trackpoints A, B, C and D.
 * We calculate the angle of the track between points A and B.
 * We do the same for the angle between points B and C.
 * If the difference of the angles is less than min_angle we assume only a minimal change
 * and ignore (delete) point B. Next we calculate the angles from A to C and C to D and do
 * the same comparison, etc.
 * If the angle is greater than min_angle then we have a certain "twist" in direction and
 * the trackpoint should be kept, i.e. we move the triple forward one point and calculate
 * the next angles from B to C and C to D, etc.
 * The result will pretty well take care of curves and even light circles while eliminating
 * quite useless points from almost straight lines.
 * Good results can be expected for angle differences around 1.0 degree.
 */
void
track_calc_angles(track_head *track, gdouble min_angle, mapwin *Mapper)
{
GtkWidget *dialog;
trackdata *tdata1;
trackdata *tdata2;
trackdata *tdata3;
GList *lp1, *lp2,*lp3;
gdouble angle1=0.;
gdouble angle2=0.;
gdouble angle_diff;
gint dx1, dy1;
gint dx2, dy2;
gint pkept=0, pskipped=0;

	lp1 = track->track;
	lp2 = g_list_next(lp1);
	if (!lp2)
		return;
	lp3 = g_list_next(lp2);
	if (!lp3)
		return;
	while (lp3) {
		tdata1 = (trackdata *)lp1->data;
		tdata2 = (trackdata *)lp2->data;
		tdata3 = (trackdata *)lp3->data;

		dx1 = tdata1->unitx - tdata2->unitx;
		dy1 = tdata1->unity - tdata2->unity;

		dx2 = tdata2->unitx - tdata3->unitx;
		dy2 = tdata2->unity - tdata3->unity;

		angle1 = atan2((gdouble)dx1, (gdouble)dy1);
		angle2 = atan2((gdouble)dx2, (gdouble)dy2);

		angle_diff = angle1 - angle2;

		if (fabs(angle_diff) < min_angle) {
			/* OK, zap point 2 ! */
			tdata2->selected = TRUE;
			lp2 = g_list_next(lp2);
			lp3 = g_list_next(lp3);
			pskipped++;
		} else {
			do {
				lp1 = g_list_next(lp1);
				if (lp1)
					tdata1 = (trackdata *)lp1->data;
			} while (lp1 && tdata1->selected);
			lp2 = g_list_next(lp1);
			if (!lp2)
				break;
			lp3 = g_list_next(lp2);
			if (!lp3)
				break;
			pkept++;
		}
	}
	track_delete_selected_nodes(track);
	draw_tracks(Mapper);
	dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)), GTK_DIALOG_MODAL| GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_MESSAGE_INFO, GTK_BUTTONS_OK, "Kept %d points,\nskipped %d points", pkept, pskipped);
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_hide(dialog);
	gtk_widget_destroy(dialog);
}


void
on_track_angle_simplify (GtkButton *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GtkWidget *dialog, *hbox, *stock, *table, *label, *spinb_angle;
GtkTreeModel *tree_model;
GtkTreeIter iter;
track_head *trackh;
gchar *tname;
gdouble min_angle;
gint result;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return;

	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);

	dialog = gtk_dialog_new_with_buttons("Angle Simplify", GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
			GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
			GTK_STOCK_OK,
			GTK_RESPONSE_ACCEPT,
			GTK_STOCK_CANCEL,
			GTK_RESPONSE_REJECT,
			NULL);

	hbox = gtk_hbox_new (FALSE, 8);
	gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
	gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), hbox, FALSE, FALSE, 0);

	stock = gtk_image_new_from_stock (GTK_STOCK_DIALOG_QUESTION, GTK_ICON_SIZE_DIALOG);
	gtk_box_pack_start (GTK_BOX (hbox), stock, FALSE, FALSE, 0);

	table = gtk_table_new (2, 4, FALSE);
	gtk_table_set_row_spacings (GTK_TABLE (table), 4);
	gtk_table_set_col_spacings (GTK_TABLE (table), 4);
	gtk_table_set_homogeneous(GTK_TABLE (table), FALSE);
	gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE, 0);

	label = gtk_label_new ("Minimum angle (degree)");
	gtk_table_attach_defaults (GTK_TABLE (table),
			label,
			0, 1, 0, 1);
	
	spinb_angle = gtk_spin_button_new_with_range(0, 2 * M_PI, .01);
	gtk_spin_button_set_value(GTK_SPIN_BUTTON(spinb_angle), 4.0);
	gtk_table_attach_defaults (GTK_TABLE (table), spinb_angle, 1, 2, 0, 1);

	gtk_widget_show_all (hbox);

	result = gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_hide (dialog);

	switch (result) {
		case GTK_RESPONSE_ACCEPT:
			min_angle = gtk_spin_button_get_value(GTK_SPIN_BUTTON(spinb_angle));
			min_angle = ((2. * M_PI) / 360.) * min_angle;
			track_calc_angles(trackh, min_angle, Mapper);
			break;
		default:
			break;
	}
	gtk_widget_destroy (dialog);
}


void
on_track_length(GtkWidget *widget, gpointer user_data)
{
mapwin *Mapper = (mapwin *)user_data;
GtkWidget *dialog;
GtkTreeModel *tree_model;
GtkTreeIter iter;
gchar *tname;
track_head *trackh;
double length=0.;

	if (!get_selected_track(&tree_model, &iter, Mapper))
		return;

	gtk_tree_model_get(tree_model, &iter, 1, &tname, 2, &trackh, -1);
	length = track_get_length(trackh);

	// gtk_widget_destroy(dialog);
	dialog = gtk_message_dialog_new(GTK_WINDOW(gtk_widget_get_toplevel(Mapper->mainwin)),
		GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
		GTK_MESSAGE_INFO,
		GTK_BUTTONS_OK,
		"Track '%s' length is\n %lfkm", tname, length);
	gtk_dialog_run(GTK_DIALOG(dialog));
	gtk_widget_hide (dialog);
	gtk_widget_destroy (dialog);
}