Example sources in the examples dir

examples/draw-and-modify-features.js

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+goog.require('ol.FeatureOverlay');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.events.condition');
+goog.require('ol.interaction.Draw');
+goog.require('ol.interaction.Modify');
+goog.require('ol.layer.Tile');
+goog.require('ol.source.MapQuest');
+goog.require('ol.style.Circle');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Stroke');
+goog.require('ol.style.Style');
+
+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
+  })
+});
+
+// The features are not added to a regular vector layer/source,
+// but to a feature overlay which holds a collection of features.
+// This collection is passed to the modify and also the draw
+// interaction, so that both can add or modify features.
+var featureOverlay = new ol.FeatureOverlay({
+  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: featureOverlay.getFeatures(),
+  // 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: featureOverlay.getFeatures(),
+    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();