private void AddPolygonOverlay(RectangleShape boundingRectangle)
{
//We are going to store all of the polygons in an in memory layer
InMemoryFeatureLayer polygonLayer = new InMemoryFeatureLayer();
//Here we generate all of our make believe polygons
Collection <Feature> features = GetGeneratedPolygons(boundingRectangle.GetBoundingBox());
//Add all of the polygons to the layer
foreach (var feature in features)
{
polygonLayer.InternalFeatures.Add(feature);
}
//We are going to style them based on their values we randomly added using the column DataPoint1
ValueStyle valueStyle = new ValueStyle();
valueStyle.ColumnName = "DataPoint1";
//Here we add all of the different sub styles so for example "1" is going to be a red semitransparent fill with a black border etc.
valueStyle.ValueItems.Add(new ValueItem("1", new AreaStyle(new GeoPen(GeoColors.Black, 1f), new GeoSolidBrush(new GeoColor(50, GeoColors.Red)))));
valueStyle.ValueItems.Add(new ValueItem("2", new AreaStyle(new GeoPen(GeoColors.Black, 1f), new GeoSolidBrush(new GeoColor(50, GeoColors.Blue)))));
valueStyle.ValueItems.Add(new ValueItem("3", new AreaStyle(new GeoPen(GeoColors.Black, 1f), new GeoSolidBrush(new GeoColor(50, GeoColors.Green)))));
valueStyle.ValueItems.Add(new ValueItem("4", new AreaStyle(new GeoPen(GeoColors.Black, 1f), new GeoSolidBrush(new GeoColor(50, GeoColors.White)))));
//We add the style we just created to the custom styles of the first zoom level. Zoom level on is the highest
// on as such you can see the whole globe. Zoom level 20 is the lowest street level.
polygonLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(valueStyle);
// He we say that whatever is one zoom level 1 is applied all the way to zoom level 20. If you only wanted to see this style at lower levels
// you would make the above line start at ZoomLevel15 say and them apply it to 20. That way once you zoomed out further than 15 the style would no longer apply.
polygonLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
// Create the overlay to house the layer and add it to the map.
LayerOverlay polygonOverlay = new LayerOverlay();
// Here we set the overlay to draw as a single tile. Alternatively we could draw it as multiples tiles all threaded but single tile is a bit faster
//We like to use multi tile for slow data sources or very complex ones that may take sime to render as you can start to see data as it comes in.
polygonOverlay.TileType = TileType.SingleTile;
polygonOverlay.Layers.Add("PolygonLayer", polygonLayer);
mapView.Overlays.Add("PolygonOverlay", polygonOverlay);
}
/// <summary>
/// Setup the map with the ThinkGeo Cloud Maps overlay to show a basic map
/// </summary>
protected override void OnAppearing()
{
base.OnAppearing();
// It is important to set the map unit first to either feet, meters or decimal degrees.
mapView.MapUnit = GeographyUnit.DecimalDegree;
// Create the background world maps using vector tiles requested from the ThinkGeo Cloud Service and add it to the map.
ThinkGeoCloudVectorMapsOverlay thinkGeoCloudVectorMapsOverlay = new ThinkGeoCloudVectorMapsOverlay("itZGOI8oafZwmtxP-XGiMvfWJPPc-dX35DmESmLlQIU~", "bcaCzPpmOG6le2pUz5EAaEKYI-KSMny_WxEAe7gMNQgGeN9sqL12OA~~", ThinkGeoCloudVectorMapsMapType.Light);
mapView.Overlays.Add(thinkGeoCloudVectorMapsOverlay);
// Creating a rectangle area we will use to generate the polygons and also start the map there.
RectangleShape currentExtent = new RectangleShape(-10810995.245624, 3939081.90719325, -10747552.5124997, 3884429.43227297);
//Do all the things we need to setup the polygon layer and overlay such as creating all the polygons etc.
AddPolygonOverlay(AreaBaseShape.ScaleDown(currentExtent.GetBoundingBox(), 80).GetBoundingBox());
//Set the maps current extent so we start there
mapView.CurrentExtent = currentExtent;
}