void RemovePolyline(Polyline polyline)
{
var native = GetNativePolyline(polyline);
if (native != null)
{
native.Remove();
_polylines.Remove(native);
}
}
protected virtual PolylineOptions CreatePolylineOptions(Polyline polyline)
{
var opts = new PolylineOptions();
opts.InvokeColor(polyline.StrokeColor.ToAndroid(Colors.Black));
opts.InvokeWidth(polyline.StrokeWidth);
foreach (var position in polyline.Geopath)
{
opts.Points.Add(new LatLng(position.Latitude, position.Longitude));
}
return(opts);
}
protected Polyline GetFormsPolyline(APolyline polyline)
{
Polyline targetPolyline = null;
for (int i = 0; i < Map.MapElements.Count; i++)
{
var element = Map.MapElements[i];
if ((string)element.MapElementId == polyline.Id)
{
targetPolyline = element as Polyline;
break;
}
}
return(targetPolyline);
}
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 APolyline GetNativePolyline(Polyline polyline)
{
APolyline targetPolyline = null;
if (_polylines != null)
{
for (int i = 0; i < _polylines.Count; i++)
{
var native = _polylines[i];
if (native.Id == (string)polyline.MapElementId)
{
targetPolyline = native;
break;
}
}
}
return(targetPolyline);
}
void AddPolyline(Polyline polyline)
{
var map = NativeMap;
if (map == null)
{
return;
}
if (_polylines == null)
{
_polylines = new List <APolyline>();
}
var options = CreatePolylineOptions(polyline);
var nativePolyline = map.AddPolyline(options);
polyline.MapElementId = nativePolyline.Id;
_polylines.Add(nativePolyline);
}
void PolylineOnPropertyChanged(Polyline formsPolyline, PropertyChangedEventArgs e)
{
var nativePolyline = GetNativePolyline(formsPolyline);
if (nativePolyline == null)
{
return;
}
if (e.PropertyName == MapElement.StrokeColorProperty.PropertyName)
{
nativePolyline.Color = formsPolyline.StrokeColor.ToAndroid(Colors.Black);
}
else if (e.PropertyName == MapElement.StrokeWidthProperty.PropertyName)
{
nativePolyline.Width = formsPolyline.StrokeWidth;
}
else if (e.PropertyName == nameof(Polyline.Geopath))
{
nativePolyline.Points = formsPolyline.Geopath.Select(position => new LatLng(position.Latitude, position.Longitude)).ToList();
}
}
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;
}
}
