private static T GetProperty <T>(
this MGLShape controller,
NSString propertyKey) where T : NSObject
{
var pointer = objc_getAssociatedObject(
controller.Handle,
propertyKey.Handle
);
return(ObjCRuntime.Runtime.GetNSObject <T>(pointer));
}
public virtual UIColor StrokeColorForShapeAnnotation(MGLMapView mapView, MGLShape annotation)
{
if (annotation.Title == "Crema to Council Crest" && annotation is MGLPolyline)
{
// Mapbox cyan
return(new UIColor(red: 59 / 255, green: 178 / 255, blue: 208 / 255, alpha: 1));
}
else
{
return(UIColor.Red);
}
}
private static void SetProperty <T>(
this MGLShape controller,
NSString propertyKey,
T value,
AssociationPolicy policy) where T : NSObject
{
objc_setAssociatedObject(
controller.Handle,
propertyKey.Handle,
value.Handle,
policy
);
}
public virtual UIColor StrokeColorForShapeAnnotation(MGLMapView mapView, MGLShape annotation)
{
if (annotation is CustomPolyline)
{
if (((CustomPolyline)annotation).Color == null)
{
return(UIColor.Orange);
}
else
{
return(((CustomPolyline)annotation).Color);
}
}
return(UIColor.Orange);
}
public static MGLShape ToShape(this GeoJSON.Net.IGeoJSONObject geoJSONObject)
{
if (geoJSONObject == null)
{
return(null);
}
var json = JsonConvert.SerializeObject(geoJSONObject);
var data = NSData.FromString(json);
var shape = MGLShape.ShapeWithData(data, (int)NSStringEncoding.UTF8, out var error);
// TODO Handle error
if (error != null)
{
return(null);
}
return(shape);
}
public UIColor MapView_StrokeColorForShapeAnnotation(MGLMapView mapView, MGLShape annotation)
{
return(UIColor.Blue);
}
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);
}
public static void SetId(this MGLShape shape, string id)
{
shape.SetProperty(kId, (NSString)id, AssociationPolicy.RetainNonAtomic);
}
public static string Id(this MGLShape shape)
{
var prop = shape.GetProperty <NSString>(kId);
return(prop);
}
public virtual nfloat AlphaForShapeAnnotation(MGLMapView mapView, MGLShape annotation)
{
return(0.5f);
}
public virtual UIColor StrokeColorForShapeAnnotation(MGLMapView mapView, MGLShape annotation)
{
return(UIColor.White);
}
void DrawPolyline()
{
var jsonPath = NSBundle.MainBundle.PathForResource("example", "geojson");
NSData data = NSFileManager.DefaultManager.Contents(jsonPath);
NSError err;
MGLShapeCollectionFeature shapeCollectionFeature = (MGLShapeCollectionFeature)MGLShape.ShapeWithData(data, (uint)NSStringEncoding.UTF8, out err);
MGLPolylineFeature polyline = (MGLPolylineFeature)shapeCollectionFeature.Shapes.First();
mapView.AddAnnotation(polyline);
}
MGLShape ShapeFromAnnotation(Annotation annotation)
{
MGLShape shape = null;
if (annotation is SymbolAnnotation symbol)
{
shape = new MGLPointAnnotation
{
Coordinate = symbol.Coordinates.ToCLCoordinate(),
};
}
else if (annotation is LineAnnotation line)
{
shape = PolyLineWithCoordinates(line.Coordinates.ToArray());
//if (polyline.Coordinates is INotifyCollectionChanged notifiyCollection)
//{
// notifiyCollection.CollectionChanged += (sender, e) =>
// {
// //TODO Move to a separated method
// if (e.Action == NotifyCollectionChangedAction.Add)
// {
// foreach (FormsMB.Point 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 FillAnnotation polyline)
{
//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);
}
annotation.NativeHandle = shape.Handle;
}
return shape;
}
