using System.Collections.ObjectModel;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.DesktopEdition;  
 
 namespace PresetVertexToTrackedPolygon  
 {  
     //Custom TrackInteractiveOverlay to add preset vertices to polygon while tracking  
     class PresetVertexTrackInteractiveOverlay : TrackInteractiveOverlay  
     {  
         private Collection<PointShape> presetPointShapes = new Collection<PointShape>();  
         private Collection<int> addVertexIndexes = new Collection<int>();  
         private PointShape newAddedVertex = null;  
 
         public Collection<PointShape> PresetPointShapes  
         {  
             get { return presetPointShapes; }  
             set { presetPointShapes = value; }  
         }  
 
         public Collection<int> AddVertexIndexes  
         {  
             get { return addVertexIndexes; }  
             set { addVertexIndexes = value; }  
         }  
 
         public PointShape NewAddedVertex  
         {  
             get { return newAddedVertex; }  
             set { newAddedVertex = value; }  
         }  
 
         protected override void OnTrackEnded(TrackEndedTrackInteractiveOverlayEventArgs e)  
         {  
             addVertexIndexes = new Collection<int>();  
             presetPointShapes = new Collection<PointShape>();  
             base.OnTrackEnded(e);  
         }  
 
         protected override BaseShape GetTrackingShapeCore()  
         {  
             BaseShape baseShape = base.GetTrackingShapeCore();  
             if (baseShape is PolygonShape)  
             {  
                 PolygonShape polygon = (PolygonShape)baseShape;  
                 if (polygon != null)  
                 {  
                     if (newAddedVertex != null)  
                     {  
                         AddVertexIndexes.Add(Vertices.Count - 2);  
                         PresetPointShapes.Add(new PointShape(newAddedVertex.X, newAddedVertex.Y));  
                         newAddedVertex = null;  
                     }  
 
                     int index = 0;  
                     foreach (int addVertexIndex in AddVertexIndexes)  
                     {  
                         PointShape presetPointShape = presetPointShapes[index];  
                         index++;  
 
                         if (presetPointShape != null)  
                         {  
                             Vertices[addVertexIndex] = new Vertex(presetPointShape);  
                         }  
                     }  
                 }  
             }  
             return baseShape;  
         }  
 
         protected override InteractiveResult MouseClickCore(InteractionArguments interactionArguments)  
         {  
             if (interactionArguments.MouseButton == MapMouseButton.Left)  
             {  
                 return base.MouseClickCore(interactionArguments);  
             }  
             else  
             {  
                 return new InteractiveResult();  
             }  
         }  
     }  
 }  
 

using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
 
 namespace PresetVertexToTrackedPolygon  
 {  
     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());  
         }  
     }  
 }  
 

using System;  
 using System.Windows.Forms;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.DesktopEdition;  
 
 namespace  PresetVertexToTrackedPolygon  
 {  
     public partial class TestForm : Form  
     {  
         PresetVertexTrackInteractiveOverlay presetVertexTrackInteractiveOverlay = new PresetVertexTrackInteractiveOverlay();  
 
         public TestForm()  
         {  
             InitializeComponent();  
         }  
 
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             winformsMap1.CurrentExtent = new RectangleShape(-96.8405,33.109,-96.812,33.092);  
             winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.FromArgb(255, 198, 255, 255));  
 
             //Displays the World Map Kit as a background.  
             ThinkGeo.MapSuite.DesktopEdition.WorldMapKitWmsDesktopOverlay worldMapKitDesktopOverlay = new ThinkGeo.MapSuite.DesktopEdition.WorldMapKitWmsDesktopOverlay();  
             winformsMap1.Overlays.Add(worldMapKitDesktopOverlay);  
 
             //Sets the TrackOverlay to PresetVertexTrackInteractiveOverlay.  
             winformsMap1.TrackOverlay = presetVertexTrackInteractiveOverlay;  
             winformsMap1.TrackOverlay.TrackMode = TrackMode.Polygon;  
 
             winformsMap1.Refresh();  
         }  
 
         private void button1_Click(object sender, EventArgs e)  
         {  
             presetVertexTrackInteractiveOverlay.NewAddedVertex = new PointShape(Convert.ToDouble(txtX.Text), Convert.ToDouble(txtY.Text));  
         }  
 
         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();  
         }  
      }  
 }