JSFiddle - React, Tailwind, and code Playground

by ahocevar

HTML

<script src="https://openlayers.org/en/v3.19.1/build/ol.js"></script>
<link rel="stylesheet" href="https://openlayers.org/en/v3.19.1/css/ol.css">
<div id="map" class="map"></div>

JavaScript

var raster = new ol.layer.Tile({
  source: new ol.source.OSM()
});

var map = new ol.Map({
  layers: [raster],
  target: 'map',
  view: new ol.View({
    center: [-11000000, 4600000],
    zoom: 4
  })
});

var features = new ol.Collection();
var featureSource = new ol.source.Vector({features: features});
var featureOverlay = new ol.layer.Vector({
  source: featureSource,
  style: new ol.style.Style({
    fill: new ol.style.Fill({
      color: 'rgba(255, 255, 255, 0.2)'
    }),
    stroke: new ol.style.Stroke({
      color: '#ffcc33',
      width: 2
    }),
    image: new ol.style.Circle({
      radius: 7,
      fill: new ol.style.Fill({
        color: '#ffcc33'
      })
    })
  })
});
map.addLayer(featureOverlay);

var modify = new ol.interaction.Modify({
  features: features,
  // the SHIFT key must be pressed to delete vertices, so
  // that new vertices can be drawn at the same position
  // of existing vertices
  deleteCondition: function(event) {
    return ol.events.condition.shiftKeyOnly(event) &&
        ol.events.condition.singleClick(event);
  }
});
map.addInteraction(modify);

var draw = new ol.interaction.Draw({
    features: features,
    type: 'Point'
});
map.addInteraction(draw);

var id = 0;
featureSource.on(['addfeature', 'changefeature'], function(e) {
  if (!e.feature.getId()) {
    e.feature.setId(++id);
  }
  console.log(e.type, e.feature.getId(), e.feature.getGeometry().getCoordinates());
});