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/* -*- Mode: JS2; indent-tabs-mode: nil; js2-basic-offset: 4 -*- */
/* vim: set et ts=4 sw=4: */
/*
* GNOME Maps 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.
*
* GNOME Maps 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 GNOME Maps; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Jonas Danielsson <jonas@threetimestwo.org>
*/
const Champlain = imports.gi.Champlain;
const GdkPixbuf = imports.gi.GdkPixbuf;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Soup = imports.gi.Soup;
const Utils = imports.utils;
let _tileService = null;
let _attributionImage = null;
const _TILE_SERVICE_URL = 'https://gis.gnome.org/services/v1/service.json';
const _DEFAULT_SERVICE_FILE = 'maps-service.json';
const _FILE_CACHE_SIZE_LIMIT = (10 * 1024 * 1024); /* 10Mb */
const _MEMORY_CACHE_SIZE_LIMIT = 100; /* number of tiles */
const AttributionLogo = new Lang.Class({
Name: 'AttributionLogo',
Extends: Gtk.Bin,
_init: function() {
this.parent({ margin_end: 6,
margin_bottom: 25,
halign: Gtk.Align.END,
valign: Gtk.Align.END });
this.add(_attributionImage);
}
});
function _updateAttributionImage(source) {
if (!_attributionImage)
_attributionImage = new Gtk.Image();
if (!source.attribution_logo || source.attribution_logo === "") {
_attributionImage.visible = false;
return;
}
let data = GLib.base64_decode(source.attribution_logo);
let stream = Gio.MemoryInputStream.new_from_bytes(GLib.Bytes.new(data));
_attributionImage.pixbuf = GdkPixbuf.Pixbuf.new_from_stream(stream, null);
}
function _createDefaultService() {
let filename = GLib.build_filenamev([pkg.pkgdatadir,
_DEFAULT_SERVICE_FILE]);
let data = Utils.readFile(filename);
_tileService = JSON.parse(data).tiles;
return _tileService;
}
function _getTileService() {
if (_tileService)
return _tileService;
let user_agent = 'gnome-maps/' + pkg.version;
let session = new Soup.Session({ user_agent : user_agent });
let msg = Soup.Message.new('GET', _TILE_SERVICE_URL);
try {
let stream = Gio.DataInputStream.new(session.send(msg, null));
let lines = "";
while(true) {
let [line, _] = stream.read_line_utf8(null);
if (line === null)
break;
lines += line;
}
_tileService = JSON.parse(lines).tiles;
return _tileService;
} catch(e) {
Utils.debug(e);
return _createDefaultService();
}
}
function _createTileSource(source) {
let tileSource = new Champlain.NetworkTileSource({
id: source.id,
name: source.name,
license: source.license,
license_uri: source.license_uri,
min_zoom_level: source.min_zoom_level,
max_zoom_level: source.max_zoom_level,
tile_size: source.tile_size,
renderer: new Champlain.ImageRenderer(),
uri_format: source.uri_format
});
tileSource.max_conns = source.max_connections;
return tileSource;
}
function _createCachedSource(source) {
let tileSource = _createTileSource(source);
_updateAttributionImage(source);
let fileCache = new Champlain.FileCache({
size_limit: _FILE_CACHE_SIZE_LIMIT,
renderer: new Champlain.ImageRenderer()
});
let memoryCache = new Champlain.MemoryCache({
size_limit: _MEMORY_CACHE_SIZE_LIMIT,
renderer: new Champlain.ImageRenderer()
});
let errorSource = new Champlain.NullTileSource({
renderer: new Champlain.ImageRenderer()
});
/*
* When the a source in the chain fails to load a given tile
* the next one in the chain tries instead. Until we get to the error
* source.
*/
let sourceChain = new Champlain.MapSourceChain();
sourceChain.push(errorSource);
sourceChain.push(tileSource);
sourceChain.push(fileCache);
sourceChain.push(memoryCache);
return sourceChain;
}
function createAerialSource() {
return _createCachedSource(_getTileService().aerial);
}
function createStreetSource() {
return _createCachedSource(_getTileService().street);
}
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