private void OnUpdateHighlight()
{
var highlightableMap = (HighlightableMap)Element;
var nativeMap = Control as MKMapView;
if (highlightableMap == null || nativeMap == null)
{
return;
}
nativeMap.RemoveOverlays(nativeMap.Overlays);
if (highlightableMap?.Highlight == null)
{
return;
}
_currentHighlight = highlightableMap.Highlight;
var overlays = new List <IMKOverlay>();
foreach (var polygon in highlightableMap.Highlight.Polygons)
{
var coordinates = new List <CLLocationCoordinate2D>();
foreach (var position in polygon.Positions)
{
coordinates.Add(new CLLocationCoordinate2D(position.Latitude, position.Longitude));
}
var blockOverlay = MKPolygon.FromCoordinates(coordinates.ToArray());
overlays.Add(blockOverlay);
}
nativeMap.AddOverlays(overlays.ToArray());
}
private void HighlightCountry()
{
//Create map polygons
var polygons = new List <MapPolygon>();
foreach (var availableCountry in AvailableCountries)
{
var feature = _countryPolygons.Features.FirstOrDefault(f =>
f.Id.Equals(availableCountry.CountryId, StringComparison.CurrentCultureIgnoreCase));
if (feature == null)
{
return;
}
if (feature.Geometry.Type == GeoJSONObjectType.MultiPolygon)
{
//Country area consists of multiple polygons
var multiPolygonGeometry = feature.Geometry as MultiPolygon;
foreach (var polygonGeometry in multiPolygonGeometry?.Coordinates)
{
var polygon = GeoJsonPolygonToMapPolygon(polygonGeometry);
if (polygon != null)
{
polygons.Add(polygon);
}
}
}
else if (feature.Geometry.Type == GeoJSONObjectType.Polygon)
{
//Single polygon
var polygonGeometry = feature.Geometry as Polygon;
var polygon = GeoJsonPolygonToMapPolygon(polygonGeometry);
if (polygon != null)
{
polygons.Add(polygon);
}
}
}
//Create the map highlight
var highlight = new MapHighlight(polygons.ToArray())
{
FillColor = Color.FromRgba(255, 0, 0, 128),
StrokeColor = Color.FromRgba(0, 0, 255, 128),
StrokeThickness = 3
};
Map.Highlight = highlight;
}
