Example of using the ol.interaction.Draw interaction together with the ol.interaction.Modify interaction.
<!DOCTYPE html> <html> <head> <title>Draw and modify features example</title> <script src="https://code.jquery.com/jquery-1.11.2.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <link rel="stylesheet" href="http://openlayers.org/en/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/build/ol.js"></script> </head> <body> <div class="container-fluid"> <div class="row-fluid"> <div class="span12"> <div id="map" class="map"></div> </div> <form class="form-inline"> <label>Geometry type </label> <select id="type"> <option value="Point">Point</option> <option value="LineString">LineString</option> <option value="Polygon">Polygon</option> </select> </form> </div> </div> <script> var raster = new ol.layer.Tile({ source: new ol.source.MapQuest({layer: 'sat'}) }); var map = new ol.Map({ layers: [raster], target: 'map', view: new ol.View({ center: [-11000000, 4600000], zoom: 4 }) }); var features = new ol.Collection(); var featureOverlay = new ol.layer.Vector({ source: new ol.source.Vector({features: features}), 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' }) }) }) }); featureOverlay.setMap(map); 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; // global so we can remove it later function addInteraction() { draw = new ol.interaction.Draw({ features: features, type: /** @type {ol.geom.GeometryType} */ (typeSelect.value) }); map.addInteraction(draw); } var typeSelect = document.getElementById('type'); /** * Let user change the geometry type. * @param {Event} e Change event. */ typeSelect.onchange = function(e) { map.removeInteraction(draw); addInteraction(); }; addInteraction(); </script> </body> </html>