mirror of
https://github.com/protomaps/PMTiles.git
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97 lines
3.4 KiB
HTML
97 lines
3.4 KiB
HTML
<html>
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<head>
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<title>PMTiles OpenLayers Vector Example</title>
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<meta charset="utf-8"/>
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<script src="https://cdn.jsdelivr.net/npm/ol@v7.3.0/dist/ol.js"></script>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.3.0/ol.css">
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<script src="https://unpkg.com/pmtiles@2.7.2/dist/index.js"></script>
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<style>
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body, #map {
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height:100vh;
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margin: 0;
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}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<script type="text/javascript">
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class VectorPMTilesSource extends ol.source.VectorTile {
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tileLoadFunction = (tile,url) => {
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// the URL construction is done internally by OL, so we need to parse it
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// back out here using a hacky regex
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const re = new RegExp(/pmtiles:\/\/(.+)\/(\d+)\/(\d+)\/(\d+)/);
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const result = url.match(re);
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const z = +result[2];
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const x = +result[3];
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const y = +result[4];
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tile.setLoader((extent, resolution, projection) => {
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tile.setState(1); // LOADING
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this._p.getZxy(z,x,y).then((tile_result) => {
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if (tile_result) {
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const format = tile.getFormat();
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const features = format.readFeatures(tile_result.data.buffer, {
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extent: extent,
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featureProjection: projection
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});
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tile.setFeatures(features);
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tile.setState(2); // LOADED
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} else {
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tile.setFeatures([]);
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tile.setState(4); // EMPTY
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}
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});
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});
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}
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constructor(options) {
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super({
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state:"loading",
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url: "pmtiles://" + options.url + "/{z}/{x}/{y}",
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format: new ol.format.MVT(),
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attributions: options.attributions
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});
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this._p = new pmtiles.PMTiles(options.url);
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this._p.getHeader().then(h => {
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if (h.tileType !== pmtiles.TileType.Mvt) {
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console.warn("Warning: pmtiles tile type is not mvt");
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}
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this.tileGrid.minZoom = h.minZoom;
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this.tileGrid.maxZoom = h.maxZoom;
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this.setTileLoadFunction(this.tileLoadFunction);
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this.setState("ready");
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});
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}
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}
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const vectorLayer = new ol.layer.VectorTile({
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declutter: true,
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source: new VectorPMTilesSource({
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url: "https://r2-public.protomaps.com/protomaps-sample-datasets/nz-buildings-v3.pmtiles",
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attributions: ["© Land Information New Zealand"]
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}),
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style: new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: 'gray',
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width: 1,
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}),
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fill: new ol.style.Fill({
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color: 'rgba(20,20,20,0.9)',
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})
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})
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});
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ol.proj.useGeographic();
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const map = new ol.Map({
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layers: [vectorLayer],
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target: 'map',
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view: new ol.View({
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center: [172.606201,-43.556510],
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zoom: 7
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}),
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});
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</script>
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</body>
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</html>
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