====== Source Code DesktopEditionSample GetFeatureClickedOn CS 100715.zip ======


====Program.cs====

<code csharp> using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
  
 namespace GetFeaturesClickedOn  
 {  
     static class Program  
     {  
         /// <summary>  
         /// The main entry point for the application.  
         /// </summary>  
         [STAThread]  
         static void Main()  
         {  
             Application.EnableVisualStyles();  
             Application.SetCompatibleTextRenderingDefault(false);  
             Application.Run(new TestForm());  
         }  
     }  
 }  
 </code>



====TestForm.cs====

<code csharp> using System;  
 using System.Windows.Forms;  
 using System.Collections.ObjectModel;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.DesktopEdition;  
  
  
 namespace  GetFeaturesClickedOn  
 {  
     public partial class TestForm : Form  
     {  
         public TestForm()  
         {  
             InitializeComponent();  
         }  
  
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             winformsMap1.CurrentExtent = new RectangleShape(-97.7583,30.2714,-97.7444,30.2632);  
             winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.StandardColors.LightGoldenrodYellow);  
  
             ShapeFileFeatureLayer streetLayer = new ShapeFileFeatureLayer(@"..\..\Data\Streets.shp");  
             streetLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.LocalRoad1;  
             streetLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
  
             LayerOverlay layerOverlay = new LayerOverlay();  
             layerOverlay.Layers.Add("StreetLayer", streetLayer);  
             winformsMap1.Overlays.Add("LayerOverlay", layerOverlay);  
  
             //InMemoryFeature to show the selected feature (the feature clicked on).  
             InMemoryFeatureLayer selectLayer = new InMemoryFeatureLayer();  
             selectLayer.Open();  
             selectLayer.Columns.Add(new FeatureSourceColumn("FENAME"));  
             selectLayer.Close();  
             selectLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.Red), 10, true);  
             selectLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.LocalRoad1("FENAME");  
             selectLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
  
             LayerOverlay selectOverlay = new LayerOverlay();  
             selectOverlay.Layers.Add("SelectLayer", selectLayer);  
             winformsMap1.Overlays.Add("SelectOverlay",selectOverlay);  
  
             winformsMap1.Refresh();  
         }  
  
         private void winformsMap1_MapClick(object sender, MapClickWinformsMapEventArgs e)  
         {  
             //Here we use a buffer of 15 in screen coordinate. This means that regardless of the zoom level, we will always find the nearest feature  
             //within 15 pixels to where we clicked.  
             int screenBuffer = 15;  
  
             //Logic for converting screen coordinate values to world coordinate for the spatial query. Notice that the distance buffer for the spatial query  
             //will change according to the zoom level while it remains the same for the screen buffer distance.  
             ScreenPointF clickedPointF = new ScreenPointF(e.ScreenX, e.ScreenY);  
             ScreenPointF bufferPointF = new ScreenPointF(clickedPointF.X + screenBuffer, clickedPointF.Y);  
  
             double distanceBuffer = ExtentHelper.GetWorldDistanceBetweenTwoScreenPoints(winformsMap1.CurrentExtent, clickedPointF, bufferPointF,  
                                                                 winformsMap1.Width , winformsMap1.Height, winformsMap1.MapUnit, DistanceUnit.Meter);  
  
             ShapeFileFeatureLayer streetLayer = (ShapeFileFeatureLayer)winformsMap1.FindFeatureLayer("StreetLayer");  
             Collection<string> columnNames = new Collection<string>();  
             columnNames.Add("FENAME");  
  
             Collection<Feature> features = streetLayer.FeatureSource.GetFeaturesNearestTo(new PointShape(e.WorldX, e.WorldY),winformsMap1.MapUnit,1,columnNames,distanceBuffer,DistanceUnit.Meter);  
  
  
             //Adds the feature clicked on to the selected layer to be displayed as highlighed and with the name labeled.  
             InMemoryFeatureLayer selectLayer = (InMemoryFeatureLayer)winformsMap1.FindFeatureLayer("SelectLayer");  
  
             selectLayer.InternalFeatures.Clear();  
  
             if (features.Count > 0)  
             {  
                 selectLayer.InternalFeatures.Add(features[0]);  
             }  
  
             //Refreshes only the select layer.  
             winformsMap1.Refresh(winformsMap1.Overlays["SelectOverlay"]);  
  
         }  
  
  
         private void winformsMap1_MouseMove(object sender, MouseEventArgs e)  
         {  
             //Displays the X and Y in screen coordinates.  
             statusStrip1.Items["toolStripStatusLabelScreen"].Text = "X:" + e.X + " Y:" + e.Y;  
  
             //Gets the PointShape in world coordinates from screen coordinates.  
             PointShape pointShape = ExtentHelper.ToWorldCoordinate(winformsMap1.CurrentExtent, new ScreenPointF(e.X, e.Y), winformsMap1.Width, winformsMap1.Height);  
  
             //Displays world coordinates.  
             statusStrip1.Items["toolStripStatusLabelWorld"].Text = "(world) X:" + Math.Round(pointShape.X, 4) + " Y:" + Math.Round(pointShape.Y, 4);  
         }  
  
         private void btnClose_Click(object sender, EventArgs e)  
         {  
             this.Close();  
         }  
  
  
  
     }  
 }  
 </code>