git.gag.com Git - fw/altos/blob - altoslib/AltosMapLoader.java

   1 /*
   2  * Copyright © 2015 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package org.altusmetrum.altoslib_11;
  19
  20 import java.io.*;
  21 import java.util.*;
  22 import java.util.concurrent.*;
  23 import java.text.*;
  24 import java.lang.Math;
  25 import java.net.URL;
  26 import java.net.URLConnection;
  27
  28 public class AltosMapLoader extends Thread implements AltosMapStoreListener {
  29         AltosMapLoaderListener  listener;
  30
  31         double  latitude, longitude;
  32         int     min_z;
  33         int     max_z;
  34         int     cur_z;
  35         int     all_types;
  36         int     cur_type;
  37         double  radius;
  38         int     scale;
  39
  40         int     tiles_loaded_layer;
  41         int     tiles_loaded_total;
  42         int     tiles_this_layer;
  43         int     tiles_total;
  44         int     layers_total;
  45         int     layers_loaded;
  46
  47         private static final int        MAX_LOADING = 200;
  48
  49         private Semaphore       loading = new Semaphore(MAX_LOADING);
  50
  51         boolean abort;
  52
  53         int tile_radius(int zoom) {
  54                 double  delta_lon = AltosMapTransform.lon_from_distance(latitude, radius);
  55
  56                 AltosMapTransform t = new AltosMapTransform(256, 256, zoom + AltosMap.default_zoom, new AltosLatLon(latitude, longitude));
  57
  58                 AltosPointDouble        center = t.point(new AltosLatLon(latitude, longitude));
  59                 AltosPointDouble        edge = t.point(new AltosLatLon(latitude, longitude + delta_lon));
  60
  61                 int tile_radius = (int) Math.ceil(Math.abs(center.x - edge.x) / AltosMap.px_size);
  62
  63                 return tile_radius;
  64         }
  65
  66         int tiles_per_layer(int zoom) {
  67                 int     tile_radius = tile_radius(zoom);
  68                 return (tile_radius * 2 + 1) * (tile_radius * 2 + 1);
  69         }
  70
  71         private boolean do_load() {
  72                 tiles_this_layer = tiles_per_layer(cur_z);
  73                 tiles_loaded_layer = 0;
  74                 listener.debug("tiles_this_layer %d (zoom %d)\n", tiles_this_layer, cur_z);
  75
  76                 int load_radius = tile_radius(cur_z);
  77                 int zoom = cur_z + AltosMap.default_zoom;
  78                 int maptype = cur_type;
  79                 AltosLatLon load_centre = new AltosLatLon(latitude, longitude);
  80                 AltosMapTransform transform = new AltosMapTransform(256, 256, zoom, load_centre);
  81
  82                 AltosPointInt   upper_left;
  83                 AltosPointInt   lower_right;
  84
  85                 AltosPointInt centre = AltosMap.floor(transform.point(load_centre));
  86
  87                 upper_left = new AltosPointInt(centre.x - load_radius * AltosMap.px_size,
  88                                                centre.y - load_radius * AltosMap.px_size);
  89                 lower_right = new AltosPointInt(centre.x + load_radius * AltosMap.px_size,
  90                                                 centre.y + load_radius * AltosMap.px_size);
  91
  92
  93                 for (int y = (int) upper_left.y; y <= lower_right.y; y += AltosMap.px_size) {
  94                         for (int x = (int) upper_left.x; x <= lower_right.x; x += AltosMap.px_size) {
  95                                 try {
  96                                         loading.acquire();
  97                                 } catch (InterruptedException ie) {
  98                                         return false;
  99                                 }
 100                                 AltosPointInt   point = new AltosPointInt(x, y);
 101                                 AltosLatLon     ul = transform.lat_lon(point);
 102                                 AltosLatLon     center = transform.lat_lon(new AltosPointDouble(x + AltosMap.px_size/2, y + AltosMap.px_size/2));
 103                                 AltosMapStore   store = AltosMapStore.get(center, zoom, maptype, AltosMap.px_size, scale);
 104                                 listener.debug("load state %s url %s\n", AltosMapTile.status_name(store.status()), store.url);
 105                                 store.add_listener(this);
 106                                 if (abort)
 107                                         return false;
 108                         }
 109                 }
 110                 return true;
 111         }
 112
 113         private int next_type(int start) {
 114                 int next_type;
 115                 for (next_type = start;
 116                      next_type <= AltosMap.maptype_terrain && (all_types & (1 << next_type)) == 0;
 117                      next_type++)
 118                         ;
 119                 return next_type;
 120         }
 121
 122         private boolean next_load() {
 123                 int next_type = next_type(cur_type + 1);
 124
 125                 if (next_type > AltosMap.maptype_terrain) {
 126                         if (cur_z == max_z) {
 127                                 return false;
 128                         } else {
 129                                 cur_z++;
 130                         }
 131                         next_type = next_type(0);
 132                 }
 133                 cur_type = next_type;
 134                 return true;
 135         }
 136
 137         public void run() {
 138
 139                 cur_z = min_z;
 140                 int ntype = 0;
 141
 142                 for (int t = AltosMap.maptype_hybrid; t <= AltosMap.maptype_terrain; t++)
 143                         if ((all_types & (1 << t)) != 0)
 144                                 ntype++;
 145                 if (ntype == 0) {
 146                         all_types = (1 << AltosMap.maptype_hybrid);
 147                         ntype = 1;
 148                 }
 149
 150                 cur_type = next_type(0);
 151
 152                 tiles_total = 0;
 153                 for (int z = min_z; z <= max_z; z++)
 154                         tiles_total += tiles_per_layer(z) * ntype;
 155
 156                 layers_total = (max_z - min_z + 1) * ntype;
 157                 layers_loaded = 0;
 158                 tiles_loaded_total = 0;
 159
 160                 listener.debug("total tiles %d layers %d\n", tiles_total, layers_total);
 161
 162                 listener.loader_start(tiles_total);
 163                 do {
 164                         if (!do_load())
 165                                 break;
 166                 } while (next_load());
 167                 if (abort)
 168                         listener.loader_done(tiles_total);
 169         }
 170
 171         public synchronized void notify_store(AltosMapStore store, int status) {
 172                 boolean do_next = false;
 173                 if (status == AltosMapTile.fetching)
 174                         return;
 175
 176                 loading.release();
 177
 178                 store.remove_listener(this);
 179
 180                 if (layers_loaded >= layers_total)
 181                         return;
 182
 183                 ++tiles_loaded_total;
 184                 ++tiles_loaded_layer;
 185
 186                 listener.debug("AltosMapLoader.notify_store status %d total %d of %d layer %d of %d\n",
 187                                status, tiles_loaded_total, tiles_total, tiles_loaded_layer, tiles_this_layer);
 188
 189                 if (tiles_loaded_layer == tiles_this_layer) {
 190                         ++layers_loaded;
 191                         listener.debug("%d layers loaded\n", layers_loaded);
 192                         do_next = true;
 193                 }
 194
 195                 if (tiles_loaded_total == tiles_total)
 196                         listener.loader_done(tiles_total);
 197                 else
 198                         listener.loader_notify(tiles_loaded_total,
 199                                                tiles_total, store.file.toString());
 200         }
 201
 202         public void abort() {
 203                 this.abort = true;
 204         }
 205
 206         public AltosMapLoader(AltosMapLoaderListener listener,
 207                               double latitude, double longitude, int min_z, int max_z, double radius, int all_types, int scale) {
 208                 listener.debug("lat %f lon %f min_z %d max_z %d radius %f all_types %d\n",
 209                                latitude, longitude, min_z, max_z, radius, all_types);
 210                 this.listener = listener;
 211                 this.latitude = latitude;
 212                 this.longitude = longitude;
 213                 this.min_z = min_z;
 214                 this.max_z = max_z;
 215                 this.radius = radius;
 216                 this.all_types = all_types;
 217                 this.scale = scale;
 218                 this.abort = false;
 219                 start();
 220         }
 221 }