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improve openlayers snippets; read header min/maxzoom [#3]

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This commit is contained in:
Brandon Liu
2023-04-26 16:19:58 +02:00
parent f15fa2f6ce
commit d15e9a5760
2 changed files with 115 additions and 116 deletions
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129
js/examples/openlayers.html
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@@ -2,8 +2,8 @@
<head>
<title>PMTiles OpenLayers Vector Example</title>
<meta charset="utf-8"/>
<script src="https://cdn.jsdelivr.net/npm/ol@v7.1.0/dist/ol.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.1.0/ol.css">
<script src="https://cdn.jsdelivr.net/npm/ol@v7.3.0/dist/ol.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v7.3.0/ol.css">
<script src="https://unpkg.com/pmtiles@2.7.2/dist/index.js"></script>
<style>
body, #map {
@@ -15,79 +15,80 @@
<body>
<div id="map"></div>
<script type="text/javascript">
class OLPMTilesSource {
constructor(url) {
this._url = url;
this._p = new pmtiles.PMTiles(url)
}
class VectorPMTilesSource extends ol.source.VectorTile {
tileLoadFunction = (tile,url) => {
// the URL construction is done internally by OL, so we need to parse it
// back out here using a hacky regex
const re = new RegExp(/pmtiles:\/\/(.+)\/(\d+)\/(\d+)\/(\d+)/);
const result = url.match(re);
const z = +result[2];
const x = +result[3];
const y = +result[4];
url = () => {
return "pmtiles://" + this._url + "/{z}/{x}/{y}";
}
vectorTileLoadFunction = (tile,url) => {
// the URL construction is done internally by OL, so we need to parse it
// back out here using a hacky regex
const re = new RegExp(/pmtiles:\/\/(.+)\/(\d+)\/(\d+)\/(\d+)/);
const result = url.match(re);
const z = +result[2];
const x = +result[3];
const y = +result[4];
tile.setLoader((extent, resolution, projection) => {
tile.setState(1); // LOADING
this._p.getZxy(z,x,y).then((tile_result) => {
if (tile_result) {
const format = tile.getFormat();
const features = format.readFeatures(tile_result.data.buffer, {
extent: extent,
featureProjection: projection
});
tile.setFeatures(features);
tile.setState(2); // LOADED
} else {
tile.setFeatures([]);
tile.setState(4); // EMPTY
}
});
});
}
tile.setLoader((extent, resolution, projection) => {
tile.setState(1); // LOADING
this._p.getZxy(z,x,y).then((tile_result) => {
if (tile_result) {
const format = tile.getFormat();
const features = format.readFeatures(tile_result.data.buffer, {
extent: extent,
featureProjection: projection
});
tile.setFeatures(features);
tile.setState(2); // LOADED
} else {
tile.setFeatures([]);
tile.setState(4); // EMPTY
}
});
});
}
const source = new OLPMTilesSource("https://r2-public.protomaps.com/protomaps-sample-datasets/nz-buildings-v3.pmtiles");
constructor(options) {
super({
state:"loading",
url: "pmtiles://" + options.url + "/{z}/{x}/{y}",
format: new ol.format.MVT(),
attributions: options.attributions
});
const style = new ol.style.Style({
this._p = new pmtiles.PMTiles(options.url);
this._p.getHeader().then(h => {
// TODO: set extent based on header
this.tileGrid.minZoom = h.minZoom;
this.tileGrid.maxZoom = h.maxZoom;
this.setTileLoadFunction(this.tileLoadFunction);
this.setState("ready");
});
}
}
const vectorLayer = new ol.layer.VectorTile({
declutter: true,
source: new VectorPMTilesSource({
url: "https://r2-public.protomaps.com/protomaps-sample-datasets/nz-buildings-v3.pmtiles",
attributions: ["© Land Information New Zealand"]
}),
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'gray',
width: 1,
}),
fill: new ol.style.Fill({
color: 'rgba(20,20,20,0.9)',
}),
});
})
})
});
const vtLayer = new ol.layer.VectorTile({
declutter: true,
source: new ol.source.VectorTile({
attributions:["© Land Information New Zealand"],
maxZoom: 14, // this could come from the PMTiles header (async)
format: new ol.format.MVT(), // this could come from the PMTiles header (async)
url:source.url(),
tileLoadFunction: source.vectorTileLoadFunction
}),
style: style,
});
ol.proj.useGeographic();
const map = new ol.Map({
layers: [vtLayer],
target: 'map',
view: new ol.View({
center: [172.606201,-43.556510],
zoom: 7,
multiWorld: true,
}),
});
ol.proj.useGeographic();
const map = new ol.Map({
layers: [vectorLayer],
target: 'map',
view: new ol.View({
center: [172.606201,-43.556510],
zoom: 7
}),
});
</script>
</body>
</html>