https://cloud.dstar.su/maps/TrackLayer.js

1// TrackLayer.js
2// Copyright 2012 Artem Prilutskiy
3
4var TrackFormat = OpenLayers.Class(OpenLayers.Format.JSON,
5  {
6    read: function(data, filter)
7    {
8      var points = [];
9      var features = [];
10      for (var key in data)
11      {
12        var position = data[key];
13        if ((position['position'] != undefined) &&
14            (position['key'] != undefined))
15        {
16          var point = new OpenLayers.Geometry.Point(position['position'][0], position['position'][1]);
17          features.push(new OpenLayers.Feature.Vector(point, { name: position['key'] }));
18          points.push(point.clone());
19        }
20      }
21      var line = new OpenLayers.Geometry.LineString(points)
22      features.push(new OpenLayers.Feature.Vector(line));
23      return features;
24    }
25  }
26);
27
28function createTrackLayer(name, call, interval, color)
29{
30  var style = new OpenLayers.Style(
31    {
32      strokeColor: color,
33      strokeOpacity: 0.6,
34      strokeWidth: 1.4,
35      fillColor: color,
36      fillOpacity: 0.6,
37      pointRadius: 3,
38      pointerEvents: 'visiblePainted'
39    }
40  );
41
42  var strategy = new OpenLayers.Strategy.Refresh(
43    {
44      interval: 30000
45    }
46  );
47
48  var layer = new OpenLayers.Layer.Vector(
49    name,
50    {
51      projection: new OpenLayers.Projection('EPSG:4326'),
52      strategies:
53      [
54        new OpenLayers.Strategy.Fixed(),
55        strategy
56      ],
57      protocol: new OpenLayers.Protocol.Script(
58        {
59          url: 'https://tracker.dstar.su/api/track.php',
60          params: { call: call, interval: interval },
61          callbackKey: 'callback',
62          format: new TrackFormat()
63        }
64      ),
65      styleMap: new OpenLayers.StyleMap({ default: style })
66    }
67  );
68
69  if (typeof tryRegisterPushUpdates == 'function')
70    tryRegisterPushUpdates(strategy, 'APRS/' + call, 'updatePosition');
71
72  return layer;
73};