ThinkGeo.com    |     Documentation    |     Premium Support

Query Layer Shapes contained within Shape from another layer

#1

I have 2 layers on a given map.  When a user click on the map, I am getting the shape from layer1 they are selecting, I then need to query layer2 the shapes that are contained within the shape from layer1.  Got any sample code for that?


Thanx,


Rob



#2

 


Robert,
Welcome to MapSuite discussion forum. Any questions please feel free to post here.


 public partial class DisplayASimpleMap : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Map1.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"));
                Map1.CurrentExtent = new RectangleShape(-125, 72, 50, -46);
                Map1.MapUnit = GeographyUnit.DecimalDegree;

                ShapeFileFeatureLayer layer1 = new ShapeFileFeatureLayer("");
                ShapeFileFeatureLayer layer2 = new ShapeFileFeatureLayer("");

                Map1.StaticOverlay.Layers.Add("layer1",layer1);
                Map1.StaticOverlay.Layers.Add("layer2",layer2);

                Map1.Click += new EventHandler<MapClickedEventArgs>(Map1_Click);
            }
        }

        void Map1_Click(object sender, MapClickedEventArgs e)
        {
            ShapeFileFeatureLayer layer1 = Map1.StaticOverlay.Layers["layer1"] as ShapeFileFeatureLayer;
            ShapeFileFeatureLayer layer2 = Map1.StaticOverlay.Layers["layer2"] as ShapeFileFeatureLayer;
            
            // To get the shape from layer1
            Collection<Feature> features = layer1.FeatureSource.GetFeaturesNearestTo(e.Position, GeographyUnit.DecimalDegree, 1, ReturningColumnsType.NoColumns);
            PolygonShape polygon = features[0].GetShape() as PolygonShape;

            // Get the Shapes that are contained within the selected shape
            RectangleShape rec = features[0].GetBoundingBox();
            Collection<Feature> featuresWithin = layer2.FeatureSource.GetFeaturesInsideBoundingBox(rec, ReturningColumnsType.NoColumns);
            foreach (Feature item in featuresWithin)
            {
                if (polygon.Contains(item))
                { 
                    // The feature is in the selected area.
                }
            }
        }


Here is the sample code that is helpful.
Johnny