Decouple source and rendered tile grid of vector tile sources

This commit is contained in:
Andreas Hocevar
2017-05-08 17:19:55 +02:00
parent 2486b25e5e
commit 785e7135a7
18 changed files with 620 additions and 287 deletions

288
src/ol/vectorimagetile.js Normal file
View File

@@ -0,0 +1,288 @@
goog.provide('ol.VectorImageTile');
goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileState');
goog.require('ol.array');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.extent');
goog.require('ol.events.EventType');
goog.require('ol.featureloader');
/**
* @constructor
* @extends {ol.Tile}
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {ol.TileState} state State.
* @param {string} src Data source url.
* @param {ol.format.Feature} format Feature format.
* @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
* @param {ol.TileCoord} urlTileCoord Wrapped tile coordinate for source urls.
* @param {ol.TileUrlFunctionType} tileUrlFunction Tile url function.
* @param {ol.tilegrid.TileGrid} sourceTileGrid Tile grid of the source.
* @param {ol.tilegrid.TileGrid} tileGrid Tile grid of the renderer.
* @param {Object.<string,ol.VectorTile>} sourceTiles Source tiles.
* @param {number} pixelRatio Pixel ratio.
* @param {ol.proj.Projection} projection Projection.
* @param {function(new: ol.VectorTile, ol.TileCoord, ol.TileState, string,
* ol.format.Feature, ol.TileLoadFunctionType)} tileClass Class to
* instantiate for source tiles.
*/
ol.VectorImageTile = function(tileCoord, state, src, format, tileLoadFunction,
urlTileCoord, tileUrlFunction, sourceTileGrid, tileGrid, sourceTiles,
pixelRatio, projection, tileClass) {
ol.Tile.call(this, tileCoord, state);
/**
* @private
* @type {CanvasRenderingContext2D}
*/
this.context_ = null;
/**
* @private
* @type {ol.format.Feature}
*/
this.format_ = format;
/**
* @private
* @type {ol.FeatureLoader}
*/
this.loader_;
/**
* @private
* @type {ol.TileReplayState}
*/
this.replayState_ = {
dirty: false,
renderedRenderOrder: null,
renderedRevision: -1,
renderedTileRevision: -1
};
/**
* @private
* @type {Object.<string,ol.VectorTile>}
*/
this.sourceTiles_ = sourceTiles;
/**
* @private
* @type {Array.<string>}
*/
this.usedSourceTileKeys_ = [];
/**
* @type {string}
*/
this.src_ = src;
/**
* @type {ol.TileCoord}
*/
this.wrappedTileCoord = urlTileCoord;
/**
* @type {Array.<ol.EventsKey>}
*/
this.loadListenerKeys_ = [];
if (urlTileCoord) {
var extent = tileGrid.getTileCoordExtent(urlTileCoord);
var resolution = tileGrid.getResolution(tileCoord[0]);
var sourceZ = sourceTileGrid.getZForResolution(resolution);
sourceTileGrid.forEachTileCoord(extent, sourceZ, function(sourceTileCoord) {
var sharedExtent = ol.extent.getIntersection(extent,
sourceTileGrid.getTileCoordExtent(sourceTileCoord));
if (ol.extent.getWidth(sharedExtent) / resolution >= 0.5 &&
ol.extent.getHeight(sharedExtent) / resolution >= 0.5) {
// only include source tile if overlap is at least 1 pixel
var sourceTileKey = sourceTileCoord.toString();
var sourceTile = sourceTiles[sourceTileKey];
if (!sourceTile) {
var tileUrl = /** @type {string} */
(tileUrlFunction(sourceTileCoord, pixelRatio, projection));
sourceTile = sourceTiles[sourceTileKey] = new tileClass(
sourceTileCoord, ol.TileState.IDLE, tileUrl, format, tileLoadFunction);
}
sourceTile.consumers++;
this.usedSourceTileKeys_.push(sourceTileKey);
}
}.bind(this));
}
};
ol.inherits(ol.VectorImageTile, ol.Tile);
/**
* @inheritDoc
*/
ol.VectorImageTile.prototype.disposeInternal = function() {
var sourceTiles = this.getSourceTiles();
for (var i = 0, ii = sourceTiles.length; i < ii; ++i) {
var sourceTile = sourceTiles[i];
sourceTile.consumers--;
if (sourceTile.consumers == 0) {
delete this.sourceTiles_[sourceTile.tileCoord.toString()];
sourceTile.dispose();
}
}
this.tileKeys.length = 0;
this.sourceTiles_ = null;
if (this.state == ol.TileState.LOADING) {
this.loadListenerKeys_.forEach(ol.events.unlistenByKey);
this.loadListenerKeys_.length = 0;
}
if (this.interimTile) {
this.interimTile.dispose();
}
this.state = ol.TileState.ABORT;
this.changed();
ol.Tile.prototype.disposeInternal.call(this);
};
/**
* @return {CanvasRenderingContext2D} The rendering context.
*/
ol.VectorImageTile.prototype.getContext = function() {
if (!this.context_) {
this.context_ = ol.dom.createCanvasContext2D();
}
return this.context_;
};
/**
* Get the Canvas for this tile.
* @return {HTMLCanvasElement} Canvas.
* @api
*/
ol.VectorImageTile.prototype.getImage = function() {
return this.replayState_.renderedTileRevision == -1 ?
null : this.context_.canvas;
};
/**
* Get the feature format assigned for reading this tile's features.
* @return {ol.format.Feature} Feature format.
* @api
*/
ol.VectorImageTile.prototype.getFormat = function() {
return this.format_;
};
/**
* @return {Array.<ol.Feature>} Features.
*/
ol.VectorImageTile.prototype.getFeatures = function() {
return this.features_;
};
/**
* @return {ol.TileReplayState} The replay state.
*/
ol.VectorImageTile.prototype.getReplayState = function() {
return this.replayState_;
};
/**
* @inheritDoc
*/
ol.VectorImageTile.prototype.getKey = function() {
return this.usedSourceTileKeys_.join('/') + '/' + this.src_;
};
/**
* @return {Array.<ol.VectorTile>} Source tiles for this tile.
*/
ol.VectorImageTile.prototype.getSourceTiles = function() {
return this.usedSourceTileKeys_.map(function(sourceTileKey) {
return this.sourceTiles_[sourceTileKey];
}.bind(this));
};
/**
* @inheritDoc
*/
ol.VectorImageTile.prototype.load = function() {
var leftToLoad = 0;
if (this.state == ol.TileState.IDLE) {
this.setState(ol.TileState.LOADING);
}
if (this.state == ol.TileState.LOADING) {
this.usedSourceTileKeys_.forEach(function(sourceTileKey) {
var sourceTile = this.sourceTiles_[sourceTileKey];
if (sourceTile.state == ol.TileState.IDLE) {
sourceTile.setLoader(this.loader_);
sourceTile.load();
}
if (sourceTile.state == ol.TileState.LOADING) {
var key = ol.events.listen(sourceTile, ol.events.EventType.CHANGE, function(e) {
var state = sourceTile.getState();
if (state == ol.TileState.LOADED ||
state == ol.TileState.ERROR ||
state == ol.TileState.EMPTY) {
--leftToLoad;
ol.events.unlistenByKey(key);
ol.array.remove(this.loadListenerKeys_, key);
if (leftToLoad == 0) {
this.setState(ol.TileState.LOADED);
}
}
}.bind(this));
this.loadListenerKeys_.push(key);
++leftToLoad;
}
}.bind(this));
}
if (leftToLoad == 0) {
setTimeout(function() {
this.setState(ol.TileState.LOADED);
}.bind(this), 0);
}
};
/**
* @param {Array.<ol.Feature>} features Features.
* @api
*/
ol.VectorImageTile.prototype.setFeatures = function(features) {
this.features_ = features;
this.setState(ol.TileState.LOADED);
};
/**
* @param {ol.TileState} tileState Tile state.
*/
ol.VectorImageTile.prototype.setState = function(tileState) {
this.state = tileState;
this.changed();
};
/**
* Sets the loader for a tile.
* @param {ol.VectorTile} tile Vector tile.
* @param {string} url URL.
*/
ol.VectorImageTile.defaultLoadFunction = function(tile, url) {
var loader = ol.featureloader.loadFeaturesXhr(
url, tile.getFormat(), tile.onLoad_.bind(tile), tile.onError_.bind(tile));
tile.setLoader(loader);
};