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/*
* Copyright © 2015 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* 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.
*/
package org.altusmetrum.altoslib_11;
import java.io.*;
import java.util.*;
import java.util.concurrent.*;
import java.text.*;
import java.lang.Math;
import java.net.URL;
import java.net.URLConnection;
public class AltosMapLoader extends Thread implements AltosMapStoreListener {
AltosMapLoaderListener listener;
double latitude, longitude;
int min_z;
int max_z;
int cur_z;
int all_types;
int cur_type;
double radius;
int scale;
int tiles_loaded_layer;
int tiles_loaded_total;
int tiles_this_layer;
int tiles_total;
int layers_total;
int layers_loaded;
private static final int MAX_LOADING = 200;
private Semaphore loading = new Semaphore(MAX_LOADING);
boolean abort;
int tile_radius(int zoom) {
double delta_lon = AltosMapTransform.lon_from_distance(latitude, radius);
AltosMapTransform t = new AltosMapTransform(256, 256, zoom + AltosMap.default_zoom, new AltosLatLon(latitude, longitude));
AltosPointDouble center = t.point(new AltosLatLon(latitude, longitude));
AltosPointDouble edge = t.point(new AltosLatLon(latitude, longitude + delta_lon));
int tile_radius = (int) Math.ceil(Math.abs(center.x - edge.x) / AltosMap.px_size);
return tile_radius;
}
int tiles_per_layer(int zoom) {
int tile_radius = tile_radius(zoom);
return (tile_radius * 2 + 1) * (tile_radius * 2 + 1);
}
private boolean do_load() {
tiles_this_layer = tiles_per_layer(cur_z);
tiles_loaded_layer = 0;
listener.debug("tiles_this_layer %d (zoom %d)\n", tiles_this_layer, cur_z);
int load_radius = tile_radius(cur_z);
int zoom = cur_z + AltosMap.default_zoom;
int maptype = cur_type;
AltosLatLon load_centre = new AltosLatLon(latitude, longitude);
AltosMapTransform transform = new AltosMapTransform(256, 256, zoom, load_centre);
AltosPointInt upper_left;
AltosPointInt lower_right;
AltosPointInt centre = AltosMap.floor(transform.point(load_centre));
upper_left = new AltosPointInt(centre.x - load_radius * AltosMap.px_size,
centre.y - load_radius * AltosMap.px_size);
lower_right = new AltosPointInt(centre.x + load_radius * AltosMap.px_size,
centre.y + load_radius * AltosMap.px_size);
for (int y = (int) upper_left.y; y <= lower_right.y; y += AltosMap.px_size) {
for (int x = (int) upper_left.x; x <= lower_right.x; x += AltosMap.px_size) {
try {
loading.acquire();
} catch (InterruptedException ie) {
return false;
}
AltosPointInt point = new AltosPointInt(x, y);
AltosLatLon ul = transform.lat_lon(point);
AltosLatLon center = transform.lat_lon(new AltosPointDouble(x + AltosMap.px_size/2, y + AltosMap.px_size/2));
AltosMapStore store = AltosMapStore.get(center, zoom, maptype, AltosMap.px_size, scale);
listener.debug("load state %s url %s\n", AltosMapTile.status_name(store.status()), store.url);
store.add_listener(this);
if (abort)
return false;
}
}
return true;
}
private int next_type(int start) {
int next_type;
for (next_type = start;
next_type <= AltosMap.maptype_terrain && (all_types & (1 << next_type)) == 0;
next_type++)
;
return next_type;
}
private boolean next_load() {
int next_type = next_type(cur_type + 1);
if (next_type > AltosMap.maptype_terrain) {
if (cur_z == max_z) {
return false;
} else {
cur_z++;
}
next_type = next_type(0);
}
cur_type = next_type;
return true;
}
public void run() {
cur_z = min_z;
int ntype = 0;
for (int t = AltosMap.maptype_hybrid; t <= AltosMap.maptype_terrain; t++)
if ((all_types & (1 << t)) != 0)
ntype++;
if (ntype == 0) {
all_types = (1 << AltosMap.maptype_hybrid);
ntype = 1;
}
cur_type = next_type(0);
tiles_total = 0;
for (int z = min_z; z <= max_z; z++)
tiles_total += tiles_per_layer(z) * ntype;
layers_total = (max_z - min_z + 1) * ntype;
layers_loaded = 0;
tiles_loaded_total = 0;
listener.debug("total tiles %d layers %d\n", tiles_total, layers_total);
listener.loader_start(tiles_total);
do {
if (!do_load())
break;
} while (next_load());
if (abort)
listener.loader_done(tiles_total);
}
public synchronized void notify_store(AltosMapStore store, int status) {
boolean do_next = false;
if (status == AltosMapTile.fetching)
return;
loading.release();
store.remove_listener(this);
if (layers_loaded >= layers_total)
return;
++tiles_loaded_total;
++tiles_loaded_layer;
listener.debug("AltosMapLoader.notify_store status %d total %d of %d layer %d of %d\n",
status, tiles_loaded_total, tiles_total, tiles_loaded_layer, tiles_this_layer);
if (tiles_loaded_layer == tiles_this_layer) {
++layers_loaded;
listener.debug("%d layers loaded\n", layers_loaded);
do_next = true;
}
if (tiles_loaded_total == tiles_total)
listener.loader_done(tiles_total);
else
listener.loader_notify(tiles_loaded_total,
tiles_total, store.file.toString());
}
public void abort() {
this.abort = true;
}
public AltosMapLoader(AltosMapLoaderListener listener,
double latitude, double longitude, int min_z, int max_z, double radius, int all_types, int scale) {
listener.debug("lat %f lon %f min_z %d max_z %d radius %f all_types %d\n",
latitude, longitude, min_z, max_z, radius, all_types);
this.listener = listener;
this.latitude = latitude;
this.longitude = longitude;
this.min_z = min_z;
this.max_z = max_z;
this.radius = radius;
this.all_types = all_types;
this.scale = scale;
this.abort = false;
start();
}
}
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