Support formats that read ArrayBuffer sources

Drag-and-Drop support for formats that read arraybuffer sources Add TextDecoder to polyfills Add custom Drag-and-Drop examples for KMZ and MVT Add sample download and KML styles option to existing example Test arraybuffer and constructed formats
2020-11-06 16:22:34 +00:00
parent bdd343e87b
commit a6860118c7
17 changed files with 5280 additions and 34 deletions
@@ -0,0 +1,133 @@
+import Feature from '../src/ol/Feature.js';
+import Map from '../src/ol/Map.js';
+import View from '../src/ol/View.js';
+import {
+  DragAndDrop,
+  defaults as defaultInteractions,
+} from '../src/ol/interaction.js';
+import {GPX, GeoJSON, IGC, KML, MVT, TopoJSON} from '../src/ol/format.js';
+import {OSM, Vector as VectorSource} from '../src/ol/source.js';
+import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
+import {createXYZ} from '../src/ol/tilegrid.js';
+
+// Define a custom MVT format as ol/format/MVT requires an extent
+
+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);
+  }
+}
+
+// Set up map with Drag and Drop interaction
+
+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(', ') || '&nbsp';
+  } else {
+    document.getElementById('info').innerHTML = '&nbsp;';
+  }
+};
+
+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);
+});
+
+// Sample data download
+
+const link = document.getElementById('download');
+
+function download(fullpath, filename) {
+  fetch(fullpath)
+    .then(function (response) {
+      return response.blob();
+    })
+    .then(function (blob) {
+      if (navigator.msSaveBlob) {
+        // link download attribuute does not work on MS browsers
+        navigator.msSaveBlob(blob, filename);
+      } else {
+        link.href = URL.createObjectURL(blob);
+        link.download = filename;
+        link.click();
+      }
+    });
+}
+
+document.getElementById('download-mvt').addEventListener('click', function () {
+  const fullpath =
+    'https://basemaps.arcgis.com/v1/arcgis/rest/services/World_Basemap/VectorTileServer/tile/' +
+    tileCoordZ.value +
+    '/' +
+    tileCoordY.value +
+    '/' +
+    tileCoordX.value +
+    '.pbf';
+  const filename =
+    tileCoordZ.value + '-' + tileCoordX.value + '-' + tileCoordY.value + '.mvt';
+  download(fullpath, filename);
+});