Drag-and-Drop Image Vector

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Drag-and-Drop Image Vector

Example of using the drag-and-drop interaction with image vector rendering.

Example of using the drag-and-drop interaction with an ol/layer/VectorImage layer. Drag and drop GPX, GeoJSON, IGC, KML, or TopoJSON files on to the map. Each file is rendered to an image on the client.

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Drag-and-Drop Image Vector</title>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="info">&nbsp;</div>
    <script src="index.js"></script>
  </body>
</html>

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index.jsimport 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import {GPX, GeoJSON, IGC, KML, TopoJSON} from 'ol/format';
import {defaults as defaultInteractions, DragAndDrop} from 'ol/interaction';
import {VectorImage as VectorImageLayer, Tile as TileLayer} from 'ol/layer';
import {BingMaps, Vector as VectorSource} from 'ol/source';

var dragAndDropInteraction = new DragAndDrop({
  formatConstructors: [
    GPX,
    GeoJSON,
    IGC,
    KML,
    TopoJSON
  ]
});

var map = new Map({
  interactions: defaultInteractions().extend([dragAndDropInteraction]),
  layers: [
    new TileLayer({
      source: new BingMaps({
        imagerySet: 'Aerial',
        key: 'Your Bing Maps Key from http://www.bingmapsportal.com/ here'
      })
    })
  ],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2
  })
});

dragAndDropInteraction.on('addfeatures', function(event) {
  var vectorSource = new VectorSource({
    features: event.features
  });
  map.addLayer(new VectorImageLayer({
    source: vectorSource
  }));
  map.getView().fit(vectorSource.getExtent());
});

var displayFeatureInfo = function(pixel) {
  var features = [];
  map.forEachFeatureAtPixel(pixel, function(feature) {
    features.push(feature);
  });
  if (features.length > 0) {
    var info = [];
    var i, ii;
    for (i = 0, ii = features.length; i < ii; ++i) {
      info.push(features[i].get('name'));
    }
    document.getElementById('info').innerHTML = info.join(', ') || '&nbsp';
  } else {
    document.getElementById('info').innerHTML = '&nbsp;';
  }
};

map.on('pointermove', function(evt) {
  if (evt.dragging) {
    return;
  }
  var pixel = map.getEventPixel(evt.originalEvent);
  displayFeatureInfo(pixel);
});

map.on('click', function(evt) {
  displayFeatureInfo(evt.pixel);
});

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package.json{
  "name": "drag-and-drop-image-vector",
  "dependencies": {
    "ol": "6.1.1"
  },
  "devDependencies": {
    "parcel": "1.11.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --experimental-scope-hoisting --public-url . index.html"
  }
}