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/*
* L.TileLayer is used for standard xyz-numbered tile layers.
*/
L.TileLayer = L.Class.extend({
includes: L.Mixin.Events,
options: {
minZoom: 0,
maxZoom: 18,
tileSize: 256,
subdomains: 'abc',
errorTileUrl: '',
attribution: '',
opacity: 1,
scheme: 'xyz',
noWrap: false,
unloadInvisibleTiles: L.Browser.mobileWebkit,
updateWhenIdle: L.Browser.mobileWebkit
},
initialize: function(url, options) {
L.Util.setOptions(this, options);
this._url = url;
if (typeof this.options.subdomains == 'string') {
this.options.subdomains = this.options.subdomains.split('');
}
},
onAdd: function(map) {
this._map = map;
// create a container div for tiles
this._initContainer();
// create an image to clone for tiles
this._createTileProto();
// set up events
map.on('viewreset', this._reset, this);
if (this.options.updateWhenIdle) {
map.on('moveend', this._update, this);
} else {
this._limitedUpdate = L.Util.limitExecByInterval(this._update, 100, this);
map.on('move', this._limitedUpdate, this);
}
this._reset();
this._update();
},
onRemove: function(map) {
this._map.getPanes().tilePane.removeChild(this._container);
this._container = null;
this._map.off('viewreset', this._reset, this);
if (this.options.updateWhenIdle) {
this._map.off('moveend', this._update, this);
} else {
this._map.off('move', this._limitedUpdate, this);
}
},
getAttribution: function() {
return this.options.attribution;
},
setOpacity: function(opacity) {
this.options.opacity = opacity;
this._setOpacity(opacity);
// stupid webkit hack to force redrawing of tiles
if (L.Browser.webkit) {
for (i in this._tiles) {
this._tiles[i].style.webkitTransform += ' translate(0,0)';
}
}
},
_setOpacity: function(opacity) {
if (opacity < 1) {
L.DomUtil.setOpacity(this._container, opacity);
}
},
_initContainer: function() {
var tilePane = this._map.getPanes().tilePane;
if (!this._container || tilePane.empty) {
this._container = L.DomUtil.create('div', 'leaflet-layer', tilePane);
this._setOpacity(this.options.opacity);
}
},
_reset: function() {
this._tiles = {};
this._initContainer();
this._container.innerHTML = '';
},
_update: function() {
var bounds = this._map.getPixelBounds(),
tileSize = this.options.tileSize;
var nwTilePoint = new L.Point(
Math.floor(bounds.min.x / tileSize),
Math.floor(bounds.min.y / tileSize)),
seTilePoint = new L.Point(
Math.floor(bounds.max.x / tileSize),
Math.floor(bounds.max.y / tileSize)),
tileBounds = new L.Bounds(nwTilePoint, seTilePoint);
this._addTilesFromCenterOut(tileBounds);
if (this.options.unloadInvisibleTiles) {
this._removeOtherTiles(tileBounds);
}
},
_addTilesFromCenterOut: function(bounds) {
var queue = [],
center = bounds.getCenter();
for (var j = bounds.min.y; j <= bounds.max.y; j++) {
for (var i = bounds.min.x; i <= bounds.max.x; i++) {
if ((i + ':' + j) in this._tiles) { continue; }
queue.push(new L.Point(i, j));
}
}
// load tiles in order of their distance to center
queue.sort(function(a, b) {
return a.distanceTo(center) - b.distanceTo(center);
});
this._tilesToLoad = queue.length;
for (var k = 0, len = this._tilesToLoad; k < len; k++) {
this._addTile(queue[k]);
}
},
_removeOtherTiles: function(bounds) {
var kArr, x, y, key;
for (key in this._tiles) {
if (this._tiles.hasOwnProperty(key)) {
kArr = key.split(':');
x = parseInt(kArr[0], 10);
y = parseInt(kArr[1], 10);
// remove tile if it's out of bounds
if (x < bounds.min.x || x > bounds.max.x || y < bounds.min.y || y > bounds.max.y) {
this._tiles[key].src = '';
if (this._tiles[key].parentNode == this._container) {
this._container.removeChild(this._tiles[key]);
}
delete this._tiles[key];
}
}
}
},
_addTile: function(tilePoint) {
var tilePos = this._getTilePos(tilePoint),
zoom = this._map.getZoom(),
key = tilePoint.x + ':' + tilePoint.y;
// wrap tile coordinates
var tileLimit = (1 << zoom);
if (!this.options.noWrap) {
tilePoint.x = ((tilePoint.x % tileLimit) + tileLimit) % tileLimit;
}
if (tilePoint.y < 0 || tilePoint.y >= tileLimit) { return; }
// create tile
var tile = this._createTile();
L.DomUtil.setPosition(tile, tilePos);
this._tiles[key] = tile;
if (this.options.scheme == 'tms') {
tilePoint.y = tileLimit - tilePoint.y - 1;
}
this._loadTile(tile, tilePoint, zoom);
this._container.appendChild(tile);
},
_getTilePos: function(tilePoint) {
var origin = this._map.getPixelOrigin(),
tileSize = this.options.tileSize;
return tilePoint.multiplyBy(tileSize).subtract(origin);
},
// image-specific code (override to implement e.g. Canvas or SVG tile layer)
getTileUrl: function(tilePoint, zoom) {
var subdomains = this.options.subdomains,
s = this.options.subdomains[(tilePoint.x + tilePoint.y) % subdomains.length];
return this._url
.replace('{s}', s)
.replace('{z}', zoom)
.replace('{x}', tilePoint.x)
.replace('{y}', tilePoint.y);
},
_createTileProto: function() {
this._tileImg = L.DomUtil.create('img', 'leaflet-tile');
this._tileImg.galleryimg = 'no';
var tileSize = this.options.tileSize;
this._tileImg.style.width = tileSize + 'px';
this._tileImg.style.height = tileSize + 'px';
},
_createTile: function() {
var tile = this._tileImg.cloneNode(false);
tile.onselectstart = tile.onmousemove = L.Util.falseFn;
return tile;
},
_loadTile: function(tile, tilePoint, zoom) {
tile._layer = this;
tile.onload = this._tileOnLoad;
tile.onerror = this._tileOnError;
tile.src = this.getTileUrl(tilePoint, zoom);
},
_tileOnLoad: function(e) {
var layer = this._layer;
this.className += ' leaflet-tile-loaded';
layer.fire('tileload', {tile: this, url: this.src});
layer._tilesToLoad--;
if (!layer._tilesToLoad) {
layer.fire('load');
}
},
_tileOnError: function(e) {
var layer = this._layer;
layer.fire('tileerror', {tile: this, url: this.src});
var newUrl = layer.options.errorTileUrl;
if (newUrl) {
this.src = newUrl;
}
}
});
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