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| import Feature from 'ol/Feature.js';
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import {
DragAndDrop,
defaults as defaultInteractions,
} from 'ol/interaction.js';
import {GPX, GeoJSON, IGC, KML, MVT, TopoJSON} from 'ol/format.js';
import {OSM, Vector as VectorSource} from 'ol/source.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {createXYZ} from 'ol/tilegrid.js';
const tileCoordZ = document.getElementById('tileCoordZ');
const tileCoordX = document.getElementById('tileCoordX');
const tileCoordY = document.getElementById('tileCoordY');
class customMVT extends MVT {
constructor() {
super({featureClass: Feature});
}
readFeatures(source, options) {
options.extent = createXYZ().getTileCoordExtent([
parseInt(tileCoordZ.value),
parseInt(tileCoordX.value),
parseInt(tileCoordY.value),
]);
return super.readFeatures(source, options);
}
}
const dragAndDropInteraction = new DragAndDrop({
formatConstructors: [customMVT, GPX, GeoJSON, IGC, KML, TopoJSON],
});
const map = new Map({
interactions: defaultInteractions().extend([dragAndDropInteraction]),
layers: [
new TileLayer({
source: new OSM(),
}),
],
target: 'map',
view: new View({
center: [0, 0],
zoom: 2,
}),
});
dragAndDropInteraction.on('addfeatures', function (event) {
const vectorSource = new VectorSource({
features: event.features,
});
map.addLayer(
new VectorLayer({
source: vectorSource,
})
);
map.getView().fit(vectorSource.getExtent());
});
const displayFeatureInfo = function (pixel) {
const features = [];
map.forEachFeatureAtPixel(pixel, function (feature) {
features.push(feature);
});
if (features.length > 0) {
const info = [];
let i, ii;
for (i = 0, ii = features.length; i < ii; ++i) {
const description =
features[i].get('name') ||
features[i].get('_name') ||
features[i].get('layer');
if (description) {
info.push(description);
}
}
document.getElementById('info').innerHTML = info.join(', ') || ' ';
} else {
document.getElementById('info').innerHTML = ' ';
}
};
map.on('pointermove', function (evt) {
if (evt.dragging) {
return;
}
const pixel = map.getEventPixel(evt.originalEvent);
displayFeatureInfo(pixel);
});
map.on('click', function (evt) {
displayFeatureInfo(evt.pixel);
});
const link = document.getElementById('download');
function download(fullpath, filename) {
fetch(fullpath)
.then(function (response) {
return response.blob();
})
.then(function (blob) {
link.href = URL.createObjectURL(blob);
link.download = filename;
link.click();
});
}
document.getElementById('download-mvt').addEventListener('click', function () {
const fullpath =
'https://basemaps.arcgis.com/arcgis/rest/services/World_Basemap_v2/VectorTileServer/tile/' +
tileCoordZ.value +
'/' +
tileCoordY.value +
'/' +
tileCoordX.value +
'.pbf';
const filename =
tileCoordZ.value + '-' + tileCoordX.value + '-' + tileCoordY.value + '.mvt';
download(fullpath, filename);
});
|
)
