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Let the source load source tiles

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This commit is contained in:
ahocevar
2018-12-12 15:51:20 +01:00
parent 831c7621c7
commit 523d3a4e8c
4 changed files with 112 additions and 113 deletions
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54
src/ol/source/VectorTile.js
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@@ -9,6 +9,9 @@ import {toSize} from '../size.js';
import UrlTile from './UrlTile.js';
import {getKeyZXY} from '../tilecoord.js';
import {createXYZ, extentFromProjection, createForProjection} from '../tilegrid.js';
import {getIntersection, getWidth, getHeight} from '../extent.js';
import {listen} from '../events.js';
import EventType from '../events/EventType.js';
/**
* @typedef {Object} Options
@@ -151,6 +154,49 @@ class VectorTile extends UrlTile {
this.sourceTiles_ = {};
}
/**
* Finds and assigns source tiles for a vector image tile.
* @param {VectorImageTile} tile Tile.
* @param {number} pixelRatio Pixel ratio.
* @param {import("../proj/Projection").default} projection Projection.
*/
assignTiles(tile, pixelRatio, projection) {
if (!tile.wrappedTileCoord) {
return;
}
const sourceTileGrid = this.tileGrid;
const tileGrid = this.getTileGridForProjection(projection);
const urlTileCoord = tile.wrappedTileCoord;
const extent = tile.extent = tileGrid.getTileCoordExtent(urlTileCoord);
const resolution = this.resolution_ = tileGrid.getResolution(urlTileCoord[0]);
const sourceZ = sourceTileGrid.getZForResolution(resolution);
sourceTileGrid.forEachTileCoord(extent, sourceZ, function(sourceTileCoord) {
let sharedExtent = getIntersection(extent,
sourceTileGrid.getTileCoordExtent(sourceTileCoord));
const sourceExtent = sourceTileGrid.getExtent();
if (sourceExtent) {
sharedExtent = getIntersection(sharedExtent, sourceExtent, sharedExtent);
}
if (getWidth(sharedExtent) / resolution >= 0.5 &&
getHeight(sharedExtent) / resolution >= 0.5) {
// only include source tile if overlap is at least 1 pixel
const sourceTileKey = sourceTileCoord.toString();
let sourceTile = this.sourceTiles_[sourceTileKey];
if (!sourceTile) {
const tileUrl = this.tileUrlFunction(sourceTileCoord, pixelRatio, projection);
sourceTile = this.sourceTiles_[sourceTileKey] = new this.tileClass(sourceTileCoord,
tileUrl == undefined ? TileState.EMPTY : TileState.IDLE,
tileUrl == undefined ? '' : tileUrl,
this.format_, this.tileLoadFunction);
tile.sourceTileListenerKeys_.push(
listen(sourceTile, EventType.CHANGE, this.handleTileChange.bind(this)));
}
sourceTile.consumers++;
tile.tileKeys.push(sourceTileKey);
}
}.bind(this));
}
/**
* @inheritDoc
*/
@@ -168,11 +214,11 @@ class VectorTile extends UrlTile {
tileCoord,
urlTileCoord !== null ? TileState.IDLE : TileState.EMPTY,
this.getRevision(),
this.format_, this.tileLoadFunction, urlTileCoord, this.tileUrlFunction,
this.tileGrid, this.getTileGridForProjection(projection),
this.sourceTiles_, pixelRatio, projection, this.tileClass,
this.handleTileChange.bind(this));
urlTileCoord,
this.tileGrid,
this.sourceTiles_);
this.assignTiles(tile, pixelRatio, projection);
this.tileCache.set(tileCoordKey, tile);
return tile;
}