examples/pathlines.html

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    <title>Flickr Photos with Pathlines</title>
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    <script src="../src/loaders/json.js" type="text/javascript"></script>
    <script src="../src/loaders/flickr.js" type="text/javascript"></script>
    <script type="text/javascript">
    
var tm;

$(function() {

    tm = TimeMap.init({
        mapId: "map",               // Id of map div element (required)
        timelineId: "timeline",     // Id of timeline div element (required) 
        options: {
            eventIconPath: "../images/"
        },
        datasets: [
            {
                title: "Photos",
                id: "photos",
                theme: "green",
                // load JSON data from Flickr - see the Flickr API for more info
                type: "flickr",
                options: {
                    // Thanks to Ken-ichi for his geotagged photos
                    url: "http://www.flickr.com/services/feeds/geo/?format=json&id=18024068@N00&jsoncallback=?"
                }
            }
        ], 
        bandIntervals: [
            Timeline.DateTime.DAY, 
            Timeline.DateTime.WEEK
        ],
        // make pathlines. This is accomplished by adding a new filter chain with a new filter
        dataDisplayedFunction: function(tm) {
            // new filter chain for map lines
            tm.addFilterChain("pathlines",
                // true condition: add a pathline
                function(item) {
                    if (!item.pathline && !item.skip) {
                        // obviously this is Google-specific, but I think it could be abstracted
                        item.pathline = new GPolyline([
                            item.opts.infoPoint.toProprietary('google'), 
                            item.next.opts.infoPoint.toProprietary('google')
                        ], "#0000CC");
                        tm.getNativeMap().addOverlay(item.pathline);
                    }
                },
                // false condition: remove a pathline
                function(item) {
                    if (item.pathline) {
                        tm.getNativeMap().removeOverlay(item.pathline);
                        item.pathline = null;
                    }
                }
            );
            // define the filter that creates the pathlines
            tm.addFilter("pathlines", function(item) {
                if (!item.next && item.event && !item.skip) {
                    // use the Timeline sequential iterator
                    var i = tm.timeline.getBand(0).getEventSource().getEventIterator(item.event.getStart(), new Date());
                    FINDNEXT: {
                        while (!item.next) {
                            if (i.hasNext()) {
                                var next = i.next().item;
                                // if the next one's taken we can skip
                                if (next.taken) {
                                    item.skip = true;
                                    break FINDNEXT;
                                }
                                // skip missing placemarks at the same location
                                if (next.placemark && !item.opts.infoPoint.equals(next.opts.infoPoint)) {
                                    item.next = next;
                                    next.taken = true;
                                }
                            }
                            else break FINDNEXT;
                        }
                    }
                }
                return (item.next && item.placemarkVisible && item.next.placemarkVisible);
            });
            // invoke the filter once data is displayed
            tm.filter("pathlines");
            // update map on timeline scroll
            tm.timeline.getBand(0).addOnScrollListener(function() {
                tm.filter("pathlines");
            });
        }
    });
    
});
    </script>
    <link href="examples.css" type="text/css" rel="stylesheet"/>
    <style>
    div#timelinecontainer{ height: 300px; }
    div#mapcontainer{ height: 400px; }
    </style>
  </head>

  <body>
    <div id="help">
    <h1>Flickr Photos with Pathlines</h1>
    This example loads geotagged Flickr photos (thanks, <a href="http://flickr.com/photos/ken-ichi/">Ken-ichi</a>!), displays them on the map and timeline, and draws lines between them sequentially, creating a rough route map (you may need to zoom in to see the effect). The lines are created using a filter that creates the line elements and shows or hides them based on the timeline location.
    </div>
    <div id="timemap">
        <div id="timelinecontainer">
          <div id="timeline"></div>
        </div>
        <div id="mapcontainer">
          <div id="map"></div>
        </div>
    </div>
  </body>
</html>