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| goog.provide('ol.renderer.Layer');
goog.require('ol');
goog.require('ol.ImageState');
goog.require('ol.Observable');
goog.require('ol.TileState');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.functions');
goog.require('ol.source.State');
/**
* @constructor
* @extends {ol.Observable}
* @param {ol.layer.Layer} layer Layer.
* @struct
*/
ol.renderer.Layer = function(layer) {
ol.Observable.call(this);
/**
* @private
* @type {ol.layer.Layer}
*/
this.layer_ = layer;
};
ol.inherits(ol.renderer.Layer, ol.Observable);
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {olx.FrameState} frameState Frame state.
* @param {number} hitTolerance Hit tolerance in pixels.
* @param {function(this: S, (ol.Feature|ol.render.Feature), ol.layer.Layer): T}
* callback Feature callback.
* @param {S} thisArg Value to use as `this` when executing `callback`.
* @return {T|undefined} Callback result.
* @template S,T
*/
ol.renderer.Layer.prototype.forEachFeatureAtCoordinate = ol.nullFunction;
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {olx.FrameState} frameState Frame state.
* @return {boolean} Is there a feature at the given coordinate?
*/
ol.renderer.Layer.prototype.hasFeatureAtCoordinate = ol.functions.FALSE;
/**
* Create a function that adds loaded tiles to the tile lookup.
* @param {ol.source.Tile} source Tile source.
* @param {ol.proj.Projection} projection Projection of the tiles.
* @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
* tiles by zoom level.
* @return {function(number, ol.TileRange):boolean} A function that can be
* called with a zoom level and a tile range to add loaded tiles to the
* lookup.
* @protected
*/
ol.renderer.Layer.prototype.createLoadedTileFinder = function(source, projection, tiles) {
return (
/**
* @param {number} zoom Zoom level.
* @param {ol.TileRange} tileRange Tile range.
* @return {boolean} The tile range is fully loaded.
*/
function(zoom, tileRange) {
function callback(tile) {
if (!tiles[zoom]) {
tiles[zoom] = {};
}
tiles[zoom][tile.tileCoord.toString()] = tile;
}
return source.forEachLoadedTile(projection, zoom, tileRange, callback);
});
};
/**
* @return {ol.layer.Layer} Layer.
*/
ol.renderer.Layer.prototype.getLayer = function() {
return this.layer_;
};
/**
* Handle changes in image state.
* @param {ol.events.Event} event Image change event.
* @private
*/
ol.renderer.Layer.prototype.handleImageChange_ = function(event) {
var image = /** @type {ol.Image} */ (event.target);
if (image.getState() === ol.ImageState.LOADED) {
this.renderIfReadyAndVisible();
}
};
/**
* Load the image if not already loaded, and register the image change
* listener if needed.
* @param {ol.ImageBase} image Image.
* @return {boolean} `true` if the image is already loaded, `false`
* otherwise.
* @protected
*/
ol.renderer.Layer.prototype.loadImage = function(image) {
var imageState = image.getState();
if (imageState != ol.ImageState.LOADED &&
imageState != ol.ImageState.ERROR) {
ol.events.listen(image, ol.events.EventType.CHANGE,
this.handleImageChange_, this);
}
if (imageState == ol.ImageState.IDLE) {
image.load();
imageState = image.getState();
}
return imageState == ol.ImageState.LOADED;
};
/**
* @protected
*/
ol.renderer.Layer.prototype.renderIfReadyAndVisible = function() {
var layer = this.getLayer();
Eif (layer.getVisible() && layer.getSourceState() == ol.source.State.READY) {
this.changed();
}
};
/**
* @param {olx.FrameState} frameState Frame state.
* @param {ol.source.Tile} tileSource Tile source.
* @protected
*/
ol.renderer.Layer.prototype.scheduleExpireCache = function(frameState, tileSource) {
Iif (tileSource.canExpireCache()) {
/**
* @param {ol.source.Tile} tileSource Tile source.
* @param {ol.PluggableMap} map Map.
* @param {olx.FrameState} frameState Frame state.
*/
var postRenderFunction = function(tileSource, map, frameState) {
var tileSourceKey = ol.getUid(tileSource).toString();
if (tileSourceKey in frameState.usedTiles) {
tileSource.expireCache(frameState.viewState.projection,
frameState.usedTiles[tileSourceKey]);
}
}.bind(null, tileSource);
frameState.postRenderFunctions.push(
/** @type {ol.PostRenderFunction} */ (postRenderFunction)
);
}
};
/**
* @param {Object.<string, ol.Attribution>} attributionsSet Attributions
* set (target).
* @param {Array.<ol.Attribution>} attributions Attributions (source).
* @protected
*/
ol.renderer.Layer.prototype.updateAttributions = function(attributionsSet, attributions) {
Iif (attributions) {
var attribution, i, ii;
for (i = 0, ii = attributions.length; i < ii; ++i) {
attribution = attributions[i];
attributionsSet[ol.getUid(attribution).toString()] = attribution;
}
}
};
/**
* @param {olx.FrameState} frameState Frame state.
* @param {ol.source.Source} source Source.
* @protected
*/
ol.renderer.Layer.prototype.updateLogos = function(frameState, source) {
var logo = source.getLogo();
Iif (logo !== undefined) {
if (typeof logo === 'string') {
frameState.logos[logo] = '';
} else if (logo) {
ol.asserts.assert(typeof logo.href == 'string', 44); // `logo.href` should be a string.
ol.asserts.assert(typeof logo.src == 'string', 45); // `logo.src` should be a string.
frameState.logos[logo.src] = logo.href;
}
}
};
/**
* @param {Object.<string, Object.<string, ol.TileRange>>} usedTiles Used tiles.
* @param {ol.source.Tile} tileSource Tile source.
* @param {number} z Z.
* @param {ol.TileRange} tileRange Tile range.
* @protected
*/
ol.renderer.Layer.prototype.updateUsedTiles = function(usedTiles, tileSource, z, tileRange) {
// FIXME should we use tilesToDrawByZ instead?
var tileSourceKey = ol.getUid(tileSource).toString();
var zKey = z.toString();
if (tileSourceKey in usedTiles) {
Eif (zKey in usedTiles[tileSourceKey]) {
usedTiles[tileSourceKey][zKey].extend(tileRange);
} else {
usedTiles[tileSourceKey][zKey] = tileRange;
}
} else {
usedTiles[tileSourceKey] = {};
usedTiles[tileSourceKey][zKey] = tileRange;
}
};
/**
* Manage tile pyramid.
* This function performs a number of functions related to the tiles at the
* current zoom and lower zoom levels:
* - registers idle tiles in frameState.wantedTiles so that they are not
* discarded by the tile queue
* - enqueues missing tiles
* @param {olx.FrameState} frameState Frame state.
* @param {ol.source.Tile} tileSource Tile source.
* @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
* @param {number} pixelRatio Pixel ratio.
* @param {ol.proj.Projection} projection Projection.
* @param {ol.Extent} extent Extent.
* @param {number} currentZ Current Z.
* @param {number} preload Load low resolution tiles up to 'preload' levels.
* @param {function(this: T, ol.Tile)=} opt_tileCallback Tile callback.
* @param {T=} opt_this Object to use as `this` in `opt_tileCallback`.
* @protected
* @template T
*/
ol.renderer.Layer.prototype.manageTilePyramid = function(
frameState, tileSource, tileGrid, pixelRatio, projection, extent,
currentZ, preload, opt_tileCallback, opt_this) {
var tileSourceKey = ol.getUid(tileSource).toString();
if (!(tileSourceKey in frameState.wantedTiles)) {
frameState.wantedTiles[tileSourceKey] = {};
}
var wantedTiles = frameState.wantedTiles[tileSourceKey];
var tileQueue = frameState.tileQueue;
var minZoom = tileGrid.getMinZoom();
var tile, tileRange, tileResolution, x, y, z;
for (z = currentZ; z >= minZoom; --z) {
tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z, tileRange);
tileResolution = tileGrid.getResolution(z);
for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
if (currentZ - z <= preload) {
tile = tileSource.getTile(z, x, y, pixelRatio, projection);
if (tile.getState() == ol.TileState.IDLE) {
wantedTiles[tile.getKey()] = true;
if (!tileQueue.isKeyQueued(tile.getKey())) {
tileQueue.enqueue([tile, tileSourceKey,
tileGrid.getTileCoordCenter(tile.tileCoord), tileResolution]);
}
}
Iif (opt_tileCallback !== undefined) {
opt_tileCallback.call(opt_this, tile);
}
} else {
tileSource.useTile(z, x, y, projection);
}
}
}
}
};
|