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;
}
}
private void DrawPolygon(Feature feature)
{
if (Preferences.Get(Constants.MapDrawPolygonsKey, true))
{
XFMPolygon xfmpolygon = new XFMPolygon
{
StrokeWidth = 4,
StrokeColor = Color.OrangeRed,
FillColor = Color.OrangeRed.AddLuminosity(.1).MultiplyAlpha(0.6),
};
Polygon polygon = (Polygon)feature.Geometry;
foreach (LineString lineString in polygon.Coordinates)
{
foreach (Position pos in lineString.Coordinates)
{
xfmpolygon.Geopath.Add(new XFMPosition(pos.Latitude, pos.Longitude));
}
}
Map.MapElements.Add(xfmpolygon);
}
}
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;
}
}
//it's Function for Draw The Polygon By Polygons (it type is FeatureCollection) That Contains Ploygon Coordinates
private void DrawPolygon()
{
for (int i = 0; i < Polygons.Features.Count; i++)
{
var coord = ((GeoJSON.Net.Geometry.Polygon)Polygons.Features[i].Geometry).Coordinates;
var positions = new List <Position>();
Xamarin.Forms.Maps.Polygon polygon = new Xamarin.Forms.Maps.Polygon
{
StrokeColor = Color.FromHex("#1BA1E2"),
StrokeWidth = 8,
FillColor = Color.FromHex("#881BA1E2")
};
for (int j = 0; j < coord[0].Coordinates.Count; j++)
{
var _lat = coord[0].Coordinates[j].Latitude;
var _long = coord[0].Coordinates[j].Longitude;
positions.Add(new Position(_lat, _long));
polygon.Geopath.Add(new Position(_lat, _long));
}
map.MapElements.Add(polygon);
}
}