Add new line-arrows example

examples/line-arrows.js

@@ -0,0 +1,67 @@
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.geom.Point');
+goog.require('ol.interaction.Draw');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.MapQuest');
+goog.require('ol.source.Vector');
+goog.require('ol.style.Icon');
+goog.require('ol.style.Stroke');
+goog.require('ol.style.Style');
+
+var raster = new ol.layer.Tile({
+  source: new ol.source.MapQuest({layer: 'sat'})
+});
+
+var source = new ol.source.Vector();
+
+var styleFunction = function(feature, resolution) {
+  var geometry = feature.getGeometry();
+  var styles = [
+    // linestring
+    new ol.style.Style({
+      stroke: new ol.style.Stroke({
+        color: '#ffcc33',
+        width: 2
+      })
+    })
+  ];
+
+  geometry.forEachSegment(function(start, end) {
+    var dx = end[0] - start[0];
+    var dy = end[1] - start[1];
+    var rotation = Math.atan2(dy, dx);
+    // arrows
+    styles.push(new ol.style.Style({
+      geometry: new ol.geom.Point(end),
+      image: new ol.style.Icon({
+        src: 'data/arrow.png',
+        anchor: [0.75, 0.5],
+        rotateWithView: false,
+        rotation: -rotation
+      })
+    }));
+  });
+
+  return styles;
+};
+var vector = new ol.layer.Vector({
+  source: source,
+  style: styleFunction
+});
+
+var map = new ol.Map({
+  layers: [raster, vector],
+  renderer: exampleNS.getRendererFromQueryString(),
+  target: 'map',
+  view: new ol.View({
+    center: [-11000000, 4600000],
+    zoom: 4
+  })
+});
+
+map.addInteraction(new ol.interaction.Draw({
+  source: source,
+  type: /** @type {ol.geom.GeometryType} */ ('LineString')
+}));