ArcGIS API for Silverlight 地圖中解決點眾多的簇解決方案

1、通用類

   #region 多點的簇顯示    public class SumClusterer : GraphicsClusterer    {        public SumClusterer()        {            MinimumColor = Colors.Red;            MaximumColor = Colors.Yellow;            SymbolScale = 2;            base.Radius = 100;        }        public string AggregateColumn { get; set; }        public double SymbolScale { get; set; }        public Color MinimumColor { get; set; }        public Color MaximumColor { get; set; }        protected override Graphic OnCreateGraphic(GraphicCollection cluster, MapPoint point, int maxClusterCount)        {            if (cluster.Count == 1) return cluster[0];            Graphic graphic = null;            double sum = 0;            foreach (Graphic g in cluster)            {                if (g.Attributes.ContainsKey(AggregateColumn))                {                    try                    {                        sum += Convert.ToDouble(g.Attributes[AggregateColumn]);                    }                    catch { }                }            }            double size = (sum + 450) / 30;            size = (Math.Log(sum * SymbolScale / 10) * 10 + 20);            if (size < 12) size = 12;            graphic = new Graphic() { Symbol = new ClusterSymbol() { Size = size }, Geometry = point };            graphic.Attributes.Add("Count", sum);            graphic.Attributes.Add("Size", size);            graphic.Attributes.Add("Color", InterpolateColor(size - 12, 100));            return graphic;        }        private static Brush InterpolateColor(double value, double max)        {            value = (int)Math.Round(value * 255.0 / max);            if (value > 255) value = 255;            else if (value < 0) value = 0;            return new SolidColorBrush(Color.FromArgb(127, 255, (byte)value, 0));        }    }    internal class ClusterSymbol : ESRI.ArcGIS.Client.Symbols.MarkerSymbol    {        public ClusterSymbol()        {            string template = @"            <ControlTemplate xmlns=""http://schemas.microsoft.com/client/2007"" xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"" >                <Grid IsHitTestVisible=""False""><EllipseFill=""{Binding Attributes[Color]}"" Width=""{Binding Attributes[Size]}""Height=""{Binding Attributes[Size]}"" /><Grid HorizontalAlignment=""Center"" VerticalAlignment=""Center""><TextBlock Text=""{Binding Attributes[Count]}"" FontSize=""9"" Margin=""1,1,0,0"" FontWeight=""Bold""Foreground=""#99000000"" /><TextBlockText=""{Binding Attributes[Count]}"" FontSize=""9"" Margin=""0,0,1,1"" FontWeight=""Bold""Foreground=""White"" /></Grid></Grid></ControlTemplate>";            this.ControlTemplate = System.Windows.Markup.XamlReader.Load(template) as ControlTemplate;        }        public double Size { get; set; }        public override double OffsetX        {            get            {                return Size / 2;            }            set            {                throw new NotSupportedException();            }        }        public override double OffsetY        {            get            {                return Size / 2;            }            set            {                throw new NotSupportedException();            }        }    }    #endregion

        void client_GetMonitorInfoCompleted(object sender, GetMonitorInfoCompletedEventArgs e)        {            ObservableCollection<MonitorInfo> list = e.Result;            ESRI.ArcGIS.Client.Projection.WebMercator mercator = new ESRI.ArcGIS.Client.Projection.WebMercator();            GraphicsLayer graphicsLayer = myMap.Layers["MyGraphicsLayer"] as GraphicsLayer;            //每次載入時先清空地圖上資料            graphicsLayer.ClearGraphics();            Uri uri = null;            Graphic graphic = null;            foreach (MonitorInfo item in list)            {                if (!string.IsNullOrEmpty(item.Latitute.ToString()) && !string.IsNullOrEmpty(item.Longitute.ToString()))                {                    //有座標值時，將該監測點添加到地圖上去                    graphic = new Graphic()                    {                        Geometry = mercator.FromGeographic(new MapPoint(double.Parse(item.Latitute.ToString().Trim()), double.Parse(item.Longitute.ToString().Trim()))),                        Symbol = LayoutRoot.Resources["DefaultMarkerSymbol"] as Symbol,                    };                    //手動為graphic添加屬性(需要用到的和資料庫表之間的關聯)                    graphic.Attributes["Id"] = item.ID;                    graphic.Attributes["Name"] = item.Name;                    graphic.Attributes["AreaID"] = item.CountyAreaID;                    for (int i = 0; i < areaId.Length; i++)                    {                        if (areaId[i] == item.ID.ToString())                        {                            switch (seedlingType[i])                            {                                case "1":                                    uri = new Uri("Images/red.png", UriKind.Relative);                                    break;                                case "2":                                    uri = new Uri("Images/yellow.png", UriKind.Relative);                                    break;                                case "3":                                    uri = new Uri("Images/green.png", UriKind.Relative);                                    break;                                case "4":                                    uri = new Uri("Images/red.png", UriKind.Relative);                                    break;                                default:                                    break;                            }                        }                    }                    BitmapImage image = new BitmapImage(uri);                    //定義Symbol樣式，包括填充顏色                    Symbol symbol = new PictureMarkerSymbol()                    {                        OffsetX = 8,                        OffsetY = 8,                        Source = image                    };                    graphic.Symbol = symbol;                    //將該Graphics添加到GraphicsLayer中去                    graphicsLayer.Graphics.Add(graphic);                    //為眾多的監測點提供簇彙總功能                    graphicsLayer.Clusterer = new SumClusterer() { AggregateColumn = "AreaID", SymbolScale = 0.008 };                    //左鍵菜單                    graphic.MouseLeftButtonDown += new MouseButtonEventHandler(Feature_MouseLeftButtonDown);                    graphic.MouseLeftButtonUp += new MouseButtonEventHandler(Feature_MouseLeftButtonUp);                    //右鍵菜單                    graphic.MouseRightButtonDown += new MouseButtonEventHandler(Feature_MouseRightButtonDown);                    graphic.MouseRightButtonUp += new MouseButtonEventHandler(Feature_MouseRightButtonUp);                }                else                {                    //不做任何處理，不添加任何點資訊                }                //座標點聚焦                ESRI.ArcGIS.Client.Geometry.Envelope selectedFeatureExtent = graphic.Geometry.Extent; //最後一個點的位置                double expandPercentage = 30;                double widthExpand = selectedFeatureExtent.Width * (expandPercentage / 100);                double heightExpand = selectedFeatureExtent.Height * (expandPercentage / 100);                ESRI.ArcGIS.Client.Geometry.Envelope displayExtent = new ESRI.ArcGIS.Client.Geometry.Envelope(                selectedFeatureExtent.XMin - (widthExpand / 2),                selectedFeatureExtent.YMin - (heightExpand / 2),                selectedFeatureExtent.XMax + (widthExpand / 2),                selectedFeatureExtent.YMax + (heightExpand / 2));                myMap.ZoomTo(displayExtent);            }        }