mirror of
https://github.com/protomaps/PMTiles.git
synced 2026-02-04 02:41:09 +00:00
improve openlayers snippets; read header min/maxzoom [#3]
This commit is contained in:
Brandon Liu
@@ -2,8 +2,8 @@
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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@v7.1.0/dist/ol.js"></script>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.1.0/ol.css">
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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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@@ -15,17 +15,8 @@
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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 OLPMTilesSource {
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constructor(url) {
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this._url = url;
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this._p = new pmtiles.PMTiles(url)
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}
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url = () => {
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return "pmtiles://" + this._url + "/{z}/{x}/{y}";
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}
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vectorTileLoadFunction = (tile,url) => {
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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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@@ -52,40 +43,50 @@
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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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// TODO: set extent based on header
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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 source = new OLPMTilesSource("https://r2-public.protomaps.com/protomaps-sample-datasets/nz-buildings-v3.pmtiles");
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const style = new ol.style.Style({
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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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const vtLayer = new ol.layer.VectorTile({
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declutter: true,
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source: new ol.source.VectorTile({
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attributions:["© Land Information New Zealand"],
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maxZoom: 14, // this could come from the PMTiles header (async)
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format: new ol.format.MVT(), // this could come from the PMTiles header (async)
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url:source.url(),
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tileLoadFunction: source.vectorTileLoadFunction
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}),
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style: style,
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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: [vtLayer],
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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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multiWorld: true,
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zoom: 7
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}),
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});
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</script>
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@@ -2,8 +2,8 @@
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<head>
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<title>PMTiles OpenLayers Raster Example</title>
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<meta charset="utf-8"/>
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<script src="https://cdn.jsdelivr.net/npm/ol@v7.1.0/dist/ol.js"></script>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.1.0/ol.css">
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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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@@ -15,50 +15,48 @@
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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 OLPMTilesSource {
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constructor(url) {
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this._url = url;
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this._p = new pmtiles.PMTiles(url)
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}
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url = () => {
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return "pmtiles://" + this._url + "/{z}/{x}/{y}";
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}
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rasterTileLoadFunction = (tile,url) => {
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tile.setState(1); // LOADING
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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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this._p.getZxy(z,x,y).then((tile_result) => {
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if (tile_result) {
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const blob = new Blob([tile_result.data]);
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const imageUrl = window.URL.createObjectURL(blob);
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tile.getImage().src = imageUrl;
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tile.setState(2); // LOADED
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} else {
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tile.setState(4); // EMPTY
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}
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class RasterPMTilesSource extends ol.source.DataTile {
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loadImage = (src) => {
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return new Promise((resolve, reject) => {
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const img = new Image();
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img.addEventListener('load', () => resolve(img));
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img.addEventListener('error', () => reject(new Error('load failed')));
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img.src = src;
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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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attributions: options.attributions
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});
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const p = new pmtiles.PMTiles(options.url);
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p.getHeader().then(h => {
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// TODO: set extent based on header
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this.tileGrid.minZoom = h.minZoom;
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this.tileGrid.maxZoom = h.maxZoom;
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this.setLoader(async (z,x,y) => {
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const response = await p.getZxy(z, x, y);
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const blob = new Blob([response.data]);
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const src = URL.createObjectURL(blob);
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const image = await this.loadImage(src);
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image.width = 512;
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URL.revokeObjectURL(src);
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return image;
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});
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this.setState("ready");
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})
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}
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}
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const source = new OLPMTilesSource("https://r2-public.protomaps.com/protomaps-sample-datasets/terrarium_z9.pmtiles");
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const rasterLayer = new ol.layer.Tile({
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source: new ol.source.XYZ({
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attributions:["https://github.com/tilezen/joerd/blob/master/docs/attribution.md"],
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url:source.url(),
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tileLoadFunction: source.rasterTileLoadFunction,
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tileSize:[512,512],
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maxZoom:9 // this could come from the PMTiles header (async)
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})
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// TODO: tile size 512,512
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const rasterLayer = new ol.layer.WebGLTile({
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source: new RasterPMTilesSource({
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url:"https://r2-public.protomaps.com/protomaps-sample-datasets/terrarium_z9.pmtiles",
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attributions:["https://github.com/tilezen/joerd/blob/master/docs/attribution.md"]
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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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@@ -67,7 +65,7 @@
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view: new ol.View({
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center: [0,0],
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zoom: 0,
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multiWorld: true,
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multiWorld: true
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}),
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});
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</script>
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