private void MarkerSymbols_QueryTask_ExecuteCompleted(object sender, QueryEventArgs e)
{
//Create centroid for all US States
FeatureSet featureSet = e.FeatureSet;
GraphicsLayer graphicsLayer = null; // layerDemo6.Layer as GraphicsLayer;
if (featureSet != null && featureSet.Features.Count > 0)
{
foreach (Graphic feature in featureSet.Features)
{
ESRI.ArcGIS.Client.Geometry.Polygon polygon = feature.Geometry as ESRI.ArcGIS.Client.Geometry.Polygon;
if (polygon == null)
{
return;
}
polygon.SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326);
Graphic graphic;
//Getting the center point of the polygon MBR:
ESRI.ArcGIS.Client.Geometry.MapPoint featureCentroid = feature.Geometry.Extent.GetCenter();
bool pointInPolygon = featureCentroid.IsWithin(polygon);
if (pointInPolygon)
{
graphic = new Graphic()
{
Geometry = featureCentroid,
};
}
else
{
graphic = new Graphic()
{
Geometry = polygon,
Symbol = null
};
}
//Assigning attributes from the feature to the graphic:
foreach (string key in feature.Attributes.Keys)
{
//for (int i = 0; i < pieChartMarkerSymbol.Fields.Count; i++)
//{
// if (pieChartMarkerSymbol.Fields[i].FieldName == key)
// graphic.Attributes.Add(key, feature.Attributes[key]);
//}
}
graphicsLayer.Graphics.Add(graphic);
//Using the geometry service to find a new centroid in the case the
//calculated centroid is not inside of the polygon:
if (!pointInPolygon)
{
GeometryService geometryService = new GeometryService("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
List <Graphic> graphicsList = new List <Graphic>();
graphicsList.Add(graphic);
geometryService.LabelPointsCompleted += MarkerSymbols_GeometryService_LabelPointsCompleted;
geometryService.LabelPointsAsync(graphicsList);
}
}
}
}
public static bool Contains(this ESRI.ArcGIS.Client.Geometry.Polygon polygon, ESRI.ArcGIS.Client.Geometry.MapPoint mapPoint)
{
return(mapPoint.IsWithin(polygon));
}
