ArcGIS API for Silverlight 地图中解决点众多的簇解决方法

概述1、通用类 #region 多点的簇显示 public class SumClusterer : GraphicsClusterer { public SumClusterer() { MinimumColor = Colors.Red; MaximumColor = Colors.Yellow;

1、通用类

   #region 多点的簇显示    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"">					<Ellipse						Fill=""{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"" FontWeight=""Bold""						Foreground=""#99000000"" />					<TextBlock						Text=""{Binding Attributes[Count]}"" 						FontSize=""9"" margin=""0,1"" 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;            //每次加载时先清空地图上数据            graphicslayer.Cleargraphics();            Uri uri = null;            Graphic graphic = null;            foreach (MonitorInfo item in List)            {                if (!string.IsNullOrEmpty(item.Latitute.ToString()) && !string.IsNullOrEmpty(item.Longitute.ToString()))                {                    //有坐标值时，将该监测点添加到地图上去                    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,};                    //手动为graphic添加属性(需要用到的和数据库表之间的关联)                    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);                    //定义Symbol样式，包括填充颜色                    Symbol symbol = new PictureMarkerSymbol()                    {                        OffsetX = 8,OffsetY = 8,Source = image                    };                    graphic.Symbol = symbol;                    //将该Graphics添加到Graphicslayer中去                    graphicslayer.Graphics.Add(graphic);                    //为众多的监测点提供簇聚合功能                    graphicslayer.Clusterer = new SumClusterer() { AggregateColumn = "AreaID",SymbolScale = 0.008 };                    //左键菜单                    graphic.MouseleftbuttonDown += new MousebuttonEventHandler(Feature_MouseleftbuttonDown);                    graphic.MouseleftbuttonUp += new MousebuttonEventHandler(Feature_MouseleftbuttonUp);                    //右键菜单                    graphic.MouseRightbuttonDown += new MousebuttonEventHandler(Feature_MouseRightbuttonDown);                    graphic.MouseRightbuttonUp += new MousebuttonEventHandler(Feature_MouseRightbuttonUp);                }                else                {                    //不做任何处理，不添加任何点信息                }                //坐标点聚焦                ESRI.ArcGIS.ClIEnt.Geometry.Envelope selectedFeatureExtent = graphic.Geometry.Extent; //最后一个点的位置                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);            }        }

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