2 * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
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, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #ifndef __GIS_TILE_H__
19 #define __GIS_TILE_H__
22 #include <glib-object.h>
23 #include "gis-object.h"
25 #define GIS_TYPE_TILE (gis_tile_get_type())
33 GisObject parent_instance;
35 /* Pointer to the tile data */
38 /* North,South,East,West limits */
43 /* Pointers to parent/child nodes */
45 GisTile *children[2][2];
47 /* Last access time (for garbage collection) */
51 struct _GisTileClass {
52 GisObjectClass parent_class;
55 typedef void (*GisTileLoadFunc)(GisTile *tile, gpointer user_data);
56 typedef void (*GisTileFreeFunc)(GisTile *tile, gpointer user_data);
58 /* Forech functions */
59 #define gis_tile_foreach(tile, child) \
60 for (int _x = 0; _x < G_N_ELEMENTS(tile->children); _x++) \
61 for (int _y = 0; child = tile->children[_x][_y], \
62 _y < G_N_ELEMENTS(tile->children[_x]); _y++) \
64 #define gis_tile_foreach_index(tile, x, y) \
65 for (x = 0; x < G_N_ELEMENTS(tile->children); x++) \
66 for (y = 0; y < G_N_ELEMENTS(tile->children[x]); y++)
68 /* Path to string table, keep in sync with tile->children */
69 extern gchar *gis_tile_path_table[2][2];
71 /* Allocate a new Tile */
72 GisTile *gis_tile_new(GisTile *parent,
73 gdouble n, gdouble s, gdouble e, gdouble w);
75 /* Return a string representation of the tile's path */
76 gchar *gis_tile_get_path(GisTile *child);
78 /* Update a root tile */
79 /* Based on eye distance (lat,lon,elev) */
80 void gis_tile_update(GisTile *root,
81 gdouble res, gint width, gint height,
82 gdouble lat, gdouble lon, gdouble elev,
83 GisTileLoadFunc load_func, gpointer user_data);
85 /* Find the leaf tile containing lat-lon */
86 GisTile *gis_tile_find(GisTile *root, gdouble lat, gdouble lon);
88 /* Delete nodes that haven't been accessed since atime */
89 GisTile *gis_tile_gc(GisTile *root, time_t atime,
90 GisTileFreeFunc free_func, gpointer user_data);
92 /* Free a tile and all it's children */
93 void gis_tile_free(GisTile *root,
94 GisTileFreeFunc free_func, gpointer user_data);