/// <summary>
/// Starts tracking at a given location.
/// </summary>
/// <param name="location"></param>
public void Track(GeoCoordinate location)
{
if (_lastTouch.HasValue) {
// is tracking disabled now?
TimeSpan timeFromLastTouch = new TimeSpan (DateTime.Now.Ticks - _lastTouch.Value);
if (timeFromLastTouch.TotalSeconds >= this.RestartAfterTouch.Value) {
// ok, the animator has waited long enough.
_lastTouch = null;
} else {
// ok, the animator still has to wait for user-input.
return;
}
}
// check if the minimum gap between tracking events is respected.
long now = DateTime.Now.Ticks;
if (_lastTrack.HasValue) {
if (_minimumTrackGap > now - _lastTrack.Value) {
return; // too fast!
}
}
_lastTrack = now;
// animate the next step(s).
TimeSpan lastTrackInterval = new TimeSpan(0, 0, 0, 0, 750);
long ticks = DateTime.Now.Ticks;
if (_lastTicks.HasValue)
{ // update the last track interval.
lastTrackInterval = TimeSpan.FromTicks(ticks - _lastTicks.Value);
}
_lastTicks = ticks;
OsmSharp.Logging.Log.TraceEvent("", System.Diagnostics.TraceEventType.Information,
"Interval: {0}ms", lastTrackInterval.TotalMilliseconds);
// give location to the route tracker.
_routeTracker.Track(location);
// calculate all map view parameters (zoom, location, tilt) to display the route/direction correctly.
float zoom = this.DefaultZoom;
GeoCoordinate center = _routeTracker.PositionRoute;
double nextDistance = 20;
Degree tilt = _mapView.MapTilt;
GeoCoordinate next = _routeTracker.PositionIn(nextDistance);
if (next != null) {
IProjection projection = _mapView.Map.Projection;
VectorF2D direction = new PointF2D(projection.ToPixel(next)) -
new PointF2D(projection.ToPixel(center));
tilt = direction.Angle(new VectorF2D(0, -1));
}
// animate to the given parameter (zoom, location, tilt).
_animator.Stop();
_animator.Start(center, zoom, tilt, lastTrackInterval.Subtract(new TimeSpan(0, 0, 0, 0, 150)));
}
