99 lines
3.0 KiB
JavaScript
99 lines
3.0 KiB
JavaScript
import VectorTileLayer from '../src/ol/layer/VectorTile.js';
|
|
import VectorTileSource from '../src/ol/source/VectorTile.js';
|
|
import MVT from '../src/ol/format/MVT.js';
|
|
import {Projection} from '../src/ol/proj.js';
|
|
import TileQueue from '../src/ol/TileQueue.js';
|
|
import {getTilePriority as tilePriorityFunction} from '../src/ol/TileQueue.js';
|
|
import {Style, Fill, Stroke, Icon, Text} from '../src/ol/style.js';
|
|
import createMapboxStreetsV6Style from './resources/mapbox-streets-v6-style.js';
|
|
import {renderDeclutterItems} from '../src/ol/render.js';
|
|
|
|
const key = 'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q';
|
|
|
|
/** @type {any} */
|
|
const worker = self;
|
|
|
|
let frameState;
|
|
const canvas = new OffscreenCanvas(1, 1);
|
|
|
|
function getCircularReplacer() {
|
|
const seen = new WeakSet();
|
|
return function(key, value) {
|
|
if (typeof value === 'object' && value !== null) {
|
|
if (seen.has(value)) {
|
|
return '[circular]';
|
|
}
|
|
seen.add(value);
|
|
}
|
|
return value;
|
|
};
|
|
}
|
|
|
|
function getTilePriority(tile, tileSourceKey, tileCenter, tileResolution) {
|
|
return tilePriorityFunction(frameState, tile, tileSourceKey, tileCenter, tileResolution);
|
|
}
|
|
|
|
const layer = new VectorTileLayer({
|
|
declutter: true,
|
|
style: createMapboxStreetsV6Style(Style, Fill, Stroke, Icon, Text),
|
|
source: new VectorTileSource({
|
|
format: new MVT(),
|
|
url: 'https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/' +
|
|
'{z}/{x}/{y}.vector.pbf?access_token=' + key
|
|
})
|
|
});
|
|
const renderer = layer.getRenderer();
|
|
const tileQueue = new TileQueue(getTilePriority, function() {
|
|
worker.postMessage({type: 'request-render'});
|
|
});
|
|
const maxTotalLoading = 8;
|
|
const maxNewLoads = 2;
|
|
|
|
let rendererTransform, rendererOpacity;
|
|
renderer.useContainer = function(target, transform, opacity) {
|
|
target.style = {};
|
|
this.canvas = target;
|
|
this.context = target.getContext('2d');
|
|
this.container = {
|
|
firstElementChild: target
|
|
};
|
|
rendererTransform = transform;
|
|
rendererOpacity = opacity;
|
|
};
|
|
|
|
let rendering = false;
|
|
|
|
worker.addEventListener('message', function(event) {
|
|
if (event.data.type !== 'render') {
|
|
return;
|
|
}
|
|
if (rendering) {
|
|
// drop this frame
|
|
worker.postMessage({type: 'request-render'});
|
|
return;
|
|
}
|
|
frameState = event.data.frameState;
|
|
frameState.tileQueue = tileQueue;
|
|
frameState.viewState.projection.__proto__ = Projection.prototype;
|
|
rendering = true;
|
|
requestAnimationFrame(function() {
|
|
renderer.renderFrame(frameState, canvas);
|
|
renderDeclutterItems(frameState, null);
|
|
if (tileQueue.getTilesLoading() < maxTotalLoading) {
|
|
tileQueue.reprioritize(); // FIXME only call if view has changed
|
|
tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);
|
|
}
|
|
const imageData = canvas.transferToImageBitmap();
|
|
worker.postMessage({
|
|
type: 'rendered',
|
|
imageData: imageData,
|
|
transform: rendererTransform,
|
|
opacity: rendererOpacity,
|
|
frameState: JSON.parse(JSON.stringify(frameState, getCircularReplacer()))
|
|
}, [imageData]);
|
|
rendering = false;
|
|
});
|
|
});
|
|
|
|
export let create;
|