====== Source Code DesktopEditionSample TrackOverlayWithEsc CS 090811.zip ======


====CustomTrackInteractiveOverlay.cs====

<code csharp>using ThinkGeo.MapSuite.DesktopEdition;  
 namespace TrackOverlayWithEscNew  
 {  
     /// <summary>  
     /// This class is used to handle dismissing the trackshape.  It also has a property to determine if you are in a trackshape operation.  The Interactive click interval is changed because the is a discrepency between when the user clicks and the point is registerd when the vlaue is left at the default 500.  
     /// </summary>  
     public class CustomTrackInteractiveOverlay : TrackInteractiveOverlay  
     {  
         private bool isTracking = false;  
         public CustomTrackInteractiveOverlay():base()  
         {  
  
         }  
  
         public bool IsTracking  
         {  
             get { return isTracking; }  
  
         }  
  
         public new void EndTracking()  
         {  
             base.EndTracking();  
         }  
         protected override void OnTrackStarted(TrackStartedTrackInteractiveOverlayEventArgs e)  
         {  
             InteractiveClickInterval = 400;  
             isTracking = true;  
             base.OnTrackStarted(e);  
         }  
         protected override void OnTrackEnded(TrackEndedTrackInteractiveOverlayEventArgs e)  
         {  
             InteractiveClickInterval = 1;  
             isTracking = false;  
             base.OnTrackEnded(e);  
         }  
  
     }  
 }  
 </code>



====Program.cs====

<code csharp>using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
  
 namespace TrackOverlayWithEscNew  
 {  
     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  TrackOverlayWithEscNew  
 {  
     public partial class TestForm : Form  
     {  
         public TestForm()  
         {  
             InitializeComponent();  
         }  
  
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             winformsMap1.TrackOverlay = new CustomTrackInteractiveOverlay();  
             winformsMap1.TrackOverlay.TrackEnded += new EventHandler<TrackEndedTrackInteractiveOverlayEventArgs>(TrackOverlay_TrackEnded);  
             winformsMap1.KeyDown += new KeyEventHandler(winformsMap1_KeyDown);  
             winformsMap1.TrackOverlay.TrackMode = TrackMode.Polygon;  
             //setting the interactiveclick interval here ensures the first point is set in the proper location.  After the trackshape is started, the value is set to 400 in the customtrackoverlay.  
             InteractiveOverlay.InteractiveClickInterval = 1;  
  
             //winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             winformsMap1.CurrentExtent = new RectangleShape(-125, 47, -67, 25);  
             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);  
  
             winformsMap1.Refresh();  
         }  
  
         void winformsMap1_KeyDown(object sender, KeyEventArgs e)  
         {  
             switch (e.KeyCode)  
             {  
                 case Keys.Escape: //cancels the current lasso operation  
                     TrackOverlayCancelled();  
                     break;  
             }  
         }  
  
         void TrackOverlay_TrackEnded(object sender, TrackEndedTrackInteractiveOverlayEventArgs e)  
         {  
             //setting the interactiveclick interval here ensures the first point is set in the proper location.  After the trackshape is started, the value is set to 400 in the customtrackoverlay.  
             InteractiveOverlay.InteractiveClickInterval = 1;  
         }  
         /// <summary>  
         /// Cancels the current lasso operation  
         /// </summary>  
         private void TrackOverlayCancelled()  
         {  
             ClearTrackingLayer();  
  
             if (winformsMap1.TrackOverlay.TrackMode == TrackMode.Polygon ||  
                 winformsMap1.TrackOverlay.TrackMode == TrackMode.Line)  
             {   //we are using a custom overlay to handle this  
                 ((CustomTrackInteractiveOverlay)winformsMap1.TrackOverlay).EndTracking();  
                 winformsMap1.TrackOverlay.MouseDoubleClick(new InteractionArguments());  
             }  
             else  
             {  
                 winformsMap1.TrackOverlay.MouseUp(new InteractionArguments());  
             }  
  
             winformsMap1.Refresh();  
         }  
  
         private void ClearTrackingLayer()  
         {  
             winformsMap1.TrackOverlay.Lock.EnterWriteLock();  
             try  
             {  
                 int count = winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Count;  
                 if (count > 0)  
                 {  
                     winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();  
                 }  
             }  
             finally  
             {  
                 winformsMap1.TrackOverlay.Lock.ExitWriteLock();  
             }  
         }  
  
  
         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>