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| goog.provide('ol.source.VectorTile');
goog.require('ol');
goog.require('ol.TileState');
goog.require('ol.VectorImageTile');
goog.require('ol.VectorTile');
goog.require('ol.size');
goog.require('ol.tilegrid');
goog.require('ol.source.UrlTile');
/**
* @classdesc
* Class for layer sources providing vector data divided into a tile grid, to be
* used with {@link ol.layer.VectorTile}. Although this source receives tiles
* with vector features from the server, it is not meant for feature editing.
* Features are optimized for rendering, their geometries are clipped at or near
* tile boundaries and simplified for a view resolution. See
* {@link ol.source.Vector} for vector sources that are suitable for feature
* editing.
*
* @constructor
* @fires ol.source.Tile.Event
* @extends {ol.source.UrlTile}
* @param {olx.source.VectorTileOptions} options Vector tile options.
* @api
*/
ol.source.VectorTile = function(options) {
var projection = options.projection || 'EPSG:3857';
var extent = options.extent || ol.tilegrid.extentFromProjection(projection);
var tileGrid = options.tileGrid || ol.tilegrid.createXYZ({
extent: extent,
maxZoom: options.maxZoom || 22,
minZoom: options.minZoom,
tileSize: options.tileSize || 512
});
ol.source.UrlTile.call(this, {
attributions: options.attributions,
cacheSize: options.cacheSize !== undefined ? options.cacheSize : 128,
extent: extent,
logo: options.logo,
opaque: false,
projection: projection,
state: options.state,
tileGrid: tileGrid,
tileLoadFunction: options.tileLoadFunction ?
options.tileLoadFunction : ol.VectorImageTile.defaultLoadFunction,
tileUrlFunction: options.tileUrlFunction,
url: options.url,
urls: options.urls,
wrapX: options.wrapX === undefined ? true : options.wrapX
});
/**
* @private
* @type {ol.format.Feature}
*/
this.format_ = options.format ? options.format : null;
/**
* @private
* @type {Object.<string,ol.VectorTile>}
*/
this.sourceTiles_ = {};
/**
* @private
* @type {boolean}
*/
this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;
/**
* @protected
* @type {function(new: ol.VectorTile, ol.TileCoord, ol.TileState, string,
* ol.format.Feature, ol.TileLoadFunctionType)}
*/
this.tileClass = options.tileClass ? options.tileClass : ol.VectorTile;
/**
* @private
* @type {Object.<string,ol.tilegrid.TileGrid>}
*/
this.tileGrids_ = {};
};
ol.inherits(ol.source.VectorTile, ol.source.UrlTile);
/**
* @return {boolean} The source can have overlapping geometries.
*/
ol.source.VectorTile.prototype.getOverlaps = function() {
return this.overlaps_;
};
/**
* @inheritDoc
*/
ol.source.VectorTile.prototype.getTile = function(z, x, y, pixelRatio, projection) {
var tileCoordKey = this.getKeyZXY(z, x, y);
if (this.tileCache.containsKey(tileCoordKey)) {
return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
} else {
var tileCoord = [z, x, y];
var urlTileCoord = this.getTileCoordForTileUrlFunction(
tileCoord, projection);
var tileUrl = urlTileCoord ?
this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;
var tile = new ol.VectorImageTile(
tileCoord,
tileUrl !== undefined ? ol.TileState.IDLE : ol.TileState.EMPTY,
tileUrl !== undefined ? tileUrl : '',
this.format_, this.tileLoadFunction, urlTileCoord, this.tileUrlFunction,
this.tileGrid, this.getTileGridForProjection(projection),
this.sourceTiles_, pixelRatio, projection, this.tileClass,
this.handleTileChange.bind(this));
this.tileCache.set(tileCoordKey, tile);
return tile;
}
};
/**
* @inheritDoc
*/
ol.source.VectorTile.prototype.getTileGridForProjection = function(projection) {
var code = projection.getCode();
var tileGrid = this.tileGrids_[code];
if (!tileGrid) {
// A tile grid that matches the tile size of the source tile grid is more
// likely to have 1:1 relationships between source tiles and rendered tiles.
var sourceTileGrid = this.tileGrid;
tileGrid = this.tileGrids_[code] = ol.tilegrid.createForProjection(projection, undefined,
sourceTileGrid ? sourceTileGrid.getTileSize(sourceTileGrid.getMinZoom()) : undefined);
}
return tileGrid;
};
/**
* @inheritDoc
*/
ol.source.VectorTile.prototype.getTilePixelRatio = function(pixelRatio) {
return pixelRatio;
};
/**
* @inheritDoc
*/
ol.source.VectorTile.prototype.getTilePixelSize = function(z, pixelRatio, projection) {
var tileSize = ol.size.toSize(this.getTileGridForProjection(projection).getTileSize(z));
return [Math.round(tileSize[0] * pixelRatio), Math.round(tileSize[1] * pixelRatio)];
};
|