private Sdk.Annotations.Annotation AddAnnotation(Annotation at)
{
Sdk.Annotations.Annotation options = null;
if (at is PointAnnotation)
{
var marker = new MarkerOptions();
marker.SetTitle(at.Title);
marker.SetSnippet(at.Title);
marker.SetPosition(((PointAnnotation)at).Coordinate.ToLatLng());
options = map.AddMarker(marker);
}
else if (at is PolylineAnnotation)
{
var polyline = at as PolylineAnnotation;
if (polyline.Coordinates?.Count() == 0)
{
return(null);
}
var notifyCollection = polyline.Coordinates as INotifyCollectionChanged;
if (notifyCollection != null)
{
notifyCollection.CollectionChanged += (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
if (_annotationDictionaries.ContainsKey(at.Id))
{
var poly = _annotationDictionaries[at.Id] as Polyline;
poly.AddPoint(polyline.Coordinates.ElementAt(e.NewStartingIndex).ToLatLng());
}
else
{
var coords = new ArrayList();
for (var i = 0; i < polyline.Coordinates.Count(); i++)
{
coords.Add(polyline.Coordinates.ElementAt(i).ToLatLng());
}
var polylineOpt = new PolylineOptions();
polylineOpt.Polyline.Width = Context.ToPixels(1);
polylineOpt.Polyline.Color = Android.Graphics.Color.Blue;
polylineOpt.AddAll(coords);
options = map.AddPolyline(polylineOpt);
_annotationDictionaries.Add(at.Id, options);
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
if (_annotationDictionaries.ContainsKey(at.Id))
{
var poly = _annotationDictionaries[at.Id] as Polyline;
poly.Points.Remove(polyline.Coordinates.ElementAt(e.OldStartingIndex).ToLatLng());
}
}
};
}
}
else if (at is MultiPolylineAnnotation)
{
var polyline = at as MultiPolylineAnnotation;
if (polyline.Coordinates == null || polyline.Coordinates.Length == 0)
{
return(null);
}
var lines = new List <PolylineOptions>();
for (var i = 0; i < polyline.Coordinates.Length; i++)
{
if (polyline.Coordinates[i].Length == 0)
{
continue;
}
var coords = new PolylineOptions();
for (var j = 0; j < polyline.Coordinates[i].Length; j++)
{
coords.Add(new LatLng(polyline.Coordinates[i][j].Lat, polyline.Coordinates[i][j].Long));
}
lines.Add(coords);
}
map.AddPolylines(lines);
}
if (options != null)
{
if (at.Id != null)
{
_annotationDictionaries.Add(at.Id, options);
}
}
return(options);
}
MGLShape ShapeFromAnnotation(FormsMB.Annotation annotation)
{
MGLShape shape = null;
if (annotation is PointAnnotation)
{
shape = new MGLPointAnnotation()
{
Coordinate = new CLLocationCoordinate2D(((PointAnnotation)annotation).Coordinate.Lat,
((PointAnnotation)annotation).Coordinate.Long),
};
}
else if (annotation is PolylineAnnotation)
{
var polyline = annotation as PolylineAnnotation;
shape = PolyLineWithCoordinates(polyline.Coordinates.ToArray());
var notifiyCollection = polyline.Coordinates as INotifyCollectionChanged;
if (notifiyCollection != null)
{
notifiyCollection.CollectionChanged += (sender, e) => {
//TODO Move to a separated method
if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (Position pos in e.NewItems)
{
var coord = TypeConverter.FromPositionToCoordinate(pos);
(shape as MGLPolyline).AppendCoordinates(ref coord, 1);
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
(shape as MGLPolyline).RemoveCoordinatesInRange(new NSRange(e.OldStartingIndex, e.OldItems.Count));
}
};
}
}
else if (annotation is MultiPolylineAnnotation)
{
var polyline = annotation as MultiPolylineAnnotation;
if (polyline.Coordinates == null || polyline.Coordinates.Length == 0)
{
return(null);
}
var lines = new MGLPolyline [polyline.Coordinates.Length];
for (var i = 0; i < polyline.Coordinates.Length; i++)
{
if (polyline.Coordinates [i].Length == 0)
{
continue;
}
lines [i] = PolyLineWithCoordinates(polyline.Coordinates[i]);
}
shape = MGLMultiPolyline.MultiPolylineWithPolylines(lines);
}
if (shape != null)
{
if (annotation.Title != null)
{
shape.Title = annotation.Title;
}
if (annotation.SubTitle != null)
{
shape.Subtitle = annotation.SubTitle;
}
if (!string.IsNullOrEmpty(annotation.Id))
{
shape.SetId(annotation.Id);
}
}
return(shape);
}