ArcGIS API for Silverlight 在地图上画圆

最新推荐文章于 2024-07-27 15:57:19 发布

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#arcgis server #silverlight

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本文介绍如何使用ArcGIS API for Silverlight在地图上绘制动态圆形。通过指定圆的半径、圆心坐标及图层，可以实现精确的地理图形绘制。文章提供了完整的代码示例。

        //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);
        }