ArcGIS API for Silverlight 在地图上画圆

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        //Silverlight前台添加 GraphicsLayer 图层        <esri:GraphicsLayer ID="MyGraphicsLayer"  Opacity="0.5"/>         /// <summary>        /// ArcGIS API for Silverlight 画圆        /// </summary>        /// <param name="radius">圆的半径</param>        /// <param name="centerP">圆心的点</param>        /// <param name="graphicsLayer">GraphicsLayer图层</param>        public void GetEllipseGraphic(double radius, MapPoint centerP, GraphicsLayer graphicsLayer)        {            Graphic result = new Graphic();            List<MapPoint> points = new List<MapPoint>();            for (double i = 0; i <= 360; i++)            {                points.Add(new MapPoint((centerP.X - Math.Cos(Math.PI * i / 180.0) * radius), (centerP.Y - Math.Sin(Math.PI * i / 180.0) * radius)));            }            ESRI.ArcGIS.Client.Geometry.PointCollection pCollection = new ESRI.ArcGIS.Client.Geometry.PointCollection(points);            ESRI.ArcGIS.Client.Geometry.Polygon g = new ESRI.ArcGIS.Client.Geometry.Polygon();            g.Rings.Add(pCollection);            result.Geometry = g;            SimpleFillSymbol sfs = new SimpleFillSymbol();            sfs.BorderBrush = new SolidColorBrush(Colors.Red);            sfs.BorderThickness = 2;            sfs.Fill = new SolidColorBrush(Colors.DarkGray);            result.Symbol = sfs;            graphicsLayer.Graphics.Add(result);        }

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