void PolygonOnPropertyChanged(Polygon polygon, PropertyChangedEventArgs e)
{
var nativePolygon = GetNativePolygon(polygon);
if (nativePolygon == null)
{
return;
}
if (e.PropertyName == MapElement.StrokeColorProperty.PropertyName)
{
nativePolygon.StrokeColor = polygon.StrokeColor.ToAndroid(Colors.Black);
}
else if (e.PropertyName == MapElement.StrokeWidthProperty.PropertyName)
{
nativePolygon.StrokeWidth = polygon.StrokeWidth;
}
else if (e.PropertyName == Polygon.FillColorProperty.PropertyName)
{
nativePolygon.FillColor = polygon.FillColor.ToAndroid();
}
else if (e.PropertyName == nameof(polygon.Geopath))
{
nativePolygon.Points = polygon.Geopath.Select(p => new LatLng(p.Latitude, p.Longitude)).ToList();
}
}
protected virtual PolygonOptions CreatePolygonOptions(Polygon polygon)
{
var opts = new PolygonOptions();
opts.InvokeStrokeColor(polygon.StrokeColor.ToAndroid(Colors.Black));
opts.InvokeStrokeWidth(polygon.StrokeWidth);
if (!polygon.StrokeColor.IsDefault())
{
opts.InvokeFillColor(polygon.FillColor.ToAndroid());
}
// Will throw an exception when added to the map if Points is empty
if (polygon.Geopath.Count == 0)
{
opts.Points.Add(new LatLng(0, 0));
}
else
{
foreach (var position in polygon.Geopath)
{
opts.Points.Add(new LatLng(position.Latitude, position.Longitude));
}
}
return(opts);
}
void RemovePolygon(Polygon polygon)
{
var native = GetNativePolygon(polygon);
if (native != null)
{
native.Remove();
_polygons.Remove(native);
}
}
protected Polygon GetFormsPolygon(APolygon polygon)
{
Polygon targetPolygon = null;
for (int i = 0; i < Element.MapElements.Count; i++)
{
var element = Element.MapElements[i];
if ((string)element.MapElementId == polygon.Id)
{
targetPolygon = (Polygon)element;
break;
}
}
return(targetPolygon);
}
public MapElementsGallery()
{
InitializeComponent();
Map.MoveToRegion(
MapSpan.FromCenterAndRadius(
new Position(39.828152, -98.569817),
Distance.FromMiles(1681)));
_polyline = new Maps.Polyline
{
Geopath =
{
new Position(47.641944, -122.127222),
new Position(37.411625, -122.071327),
new Position(35.138901, -80.922623)
}
};
_polygon = new Maps.Polygon
{
StrokeColor = Color.FromHex("#002868"),
FillColor = Color.FromHex("#88BF0A30"),
Geopath =
{
new Position(37, -102.05),
new Position(37, -109.05),
new Position(41, -109.05),
new Position(41, -102.05)
}
};
_circle = new Circle
{
Center = new Position(42.352364, -71.067177),
Radius = Distance.FromMiles(100.0),
StrokeColor = Color.FromRgb(31, 174, 206),
FillColor = Color.FromRgba(31, 174, 206, 127)
};
Map.MapElements.Add(_polyline);
Map.MapElements.Add(_polygon);
Map.MapElements.Add(_circle);
ElementPicker.SelectedIndex = 0;
}
void AddClicked(object sender, EventArgs e)
{
switch (_selectedType)
{
case SelectedElementType.Polyline:
Map.MapElements.Add(_polyline = new Maps.Polyline());
break;
case SelectedElementType.Polygon:
Map.MapElements.Add(_polygon = new Maps.Polygon());
break;
case SelectedElementType.Circle:
Map.MapElements.Add(_circle = new Circle());
break;
}
}
protected APolygon GetNativePolygon(Polygon polygon)
{
APolygon targetPolygon = null;
if (_polygons != null)
{
for (int i = 0; i < _polygons.Count; i++)
{
var native = _polygons[i];
if (native.Id == (string)polygon.MapElementId)
{
targetPolygon = native;
break;
}
}
}
return(targetPolygon);
}
void AddPolygon(Polygon polygon)
{
var map = NativeMap;
if (map == null)
{
return;
}
if (_polygons == null)
{
_polygons = new List <APolygon>();
}
var options = CreatePolygonOptions(polygon);
var nativePolygon = map.AddPolygon(options);
polygon.MapElementId = nativePolygon.Id;
_polygons.Add(nativePolygon);
}
void RemoveClicked(object sender, EventArgs e)
{
switch (_selectedType)
{
case SelectedElementType.Polyline:
Map.MapElements.Remove(_polyline);
_polyline = Map.MapElements.OfType <Maps.Polyline>().LastOrDefault();
if (_polyline == null)
{
Map.MapElements.Add(_polyline = new Maps.Polyline());
}
break;
case SelectedElementType.Polygon:
Map.MapElements.Remove(_polygon);
_polygon = Map.MapElements.OfType <Maps.Polygon>().LastOrDefault();
if (_polygon == null)
{
Map.MapElements.Add(_polygon = new Maps.Polygon());
}
break;
case SelectedElementType.Circle:
Map.MapElements.Remove(_circle);
_circle = Map.MapElements.OfType <Circle>().LastOrDefault();
if (_circle == null)
{
Map.MapElements.Add(_circle = new Circle());
}
break;
}
}