Extent interaction example

2016-08-26 08:38:57 +02:00
parent 7ed96f69f7
commit 4b2884f10f
2 changed files with 61 additions and 0 deletions
@@ -0,0 +1,49 @@
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.events.condition');
+goog.require('ol.format.GeoJSON');
+goog.require('ol.interaction.Extent');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.OSM');
+goog.require('ol.source.Vector');
+
+var vectorSource = new ol.source.Vector({
+  url: 'data/geojson/countries.geojson',
+  format: new ol.format.GeoJSON()
+});
+
+var map = new ol.Map({
+  layers: [
+    new ol.layer.Tile({
+      source: new ol.source.OSM()
+    }),
+    new ol.layer.Vector({
+      source: vectorSource
+    })
+  ],
+  renderer: 'canvas',
+  target: 'map',
+  view: new ol.View({
+    center: [0, 0],
+    zoom: 2
+  })
+});
+
+var extent = new ol.interaction.Extent({
+  condition: ol.events.condition.platformModifierKeyOnly
+});
+map.addInteraction(extent);
+extent.setActive(false);
+
+//Enable interaction by holding shift
+this.addEventListener('keydown', function(event) {
+  if (event.keyCode == 16) {
+    extent.setActive(true);
+  }
+});
+this.addEventListener('keyup', function(event) {
+  if (event.keyCode == 16) {
+    extent.setActive(false);
+  }
+});