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
--- a/examples/drag-and-drop-custom-kmz.js
+++ b/examples/drag-and-drop-custom-kmz.js
@@ -0,0 +1,155 @@
+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, 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';
+
+// Create functions to extract KML and icons from KMZ array buffer,
+// which must be done synchronously.
+
+const zip = new JSZip();
+
+function getKMLData(buffer) {
+  let kmlData;
+  zip.load(buffer);
+  const kmlFile = zip.file(/.kml$/i)[0];
+  if (kmlFile) {
+    kmlData = kmlFile.asText();
+  }
+  return kmlData;
+}
+
+function getKMLImage(href) {
+  let url = href;
+  let path = window.location.href;
+  path = path.slice(0, path.lastIndexOf('/') + 1);
+  if (href.indexOf(path) === 0) {
+    const regexp = new RegExp(href.replace(path, '') + '$', 'i');
+    const kmlFile = zip.file(regexp)[0];
+    if (kmlFile) {
+      url = URL.createObjectURL(new Blob([kmlFile.asArrayBuffer()]));
+    }
+  }
+  return url;
+}
+
+// Define a KMZ format class by subclassing ol/format/KML
+
+class KMZ extends KML {
+  constructor(opt_options) {
+    const options = opt_options || {};
+    options.iconUrlFunction = getKMLImage;
+    super(options);
+  }
+
+  getType() {
+    return 'arraybuffer';
+  }
+
+  readFeature(source, options) {
+    const kmlData = getKMLData(source);
+    return super.readFeature(kmlData, options);
+  }
+
+  readFeatures(source, options) {
+    const kmlData = getKMLData(source);
+    return super.readFeatures(kmlData, options);
+  }
+}
+
+// Set up map with Drag and Drop interaction
+
+const dragAndDropInteraction = new DragAndDrop({
+  formatConstructors: [KMZ, 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('description') ||
+        features[i].get('name') ||
+        features[i].get('_name') ||
+        features[i].get('layer');
+      if (description) {
+        info.push(description);
+      }
+    }
+    document.getElementById('info').innerHTML = info.join('<br/>') || '&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-kmz').addEventListener('click', function () {
+  download('data/kmz/iceland.kmz', 'iceland.kmz');
+});