using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
 
 namespace StreamLoading  
 {  
     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.IO;  
 using System.Windows.Forms;  
 using ThinkGeo.MapSuite.Core;  
 using ThinkGeo.MapSuite.DesktopEdition;  
 
 namespace  StreamLoading  
 {  
     public partial class TestForm : Form  
     {  
         public TestForm()  
         {  
             InitializeComponent();  
         }  
 
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             winformsMap1.MapUnit = GeographyUnit.DecimalDegree;  
             winformsMap1.CurrentExtent = new RectangleShape(-122,74,106,-62);  
 
             GdiPlusRasterLayer worldImageLayer = new GdiPlusRasterLayer(@"world.tif");  
             ((GdiPlusRasterSource)(worldImageLayer.ImageSource)).StreamLoading += new EventHandler<StreamLoadingEventArgs>(MainForm_StreamLoading);  
             worldImageLayer.UpperThreshold = double.MaxValue;  
             worldImageLayer.LowerThreshold = 0;  
             worldImageLayer.IsGrayscale = false;  
 
             LayerOverlay testOverlay = new LayerOverlay();  
             testOverlay.Layers.Add("worldImageLayer", worldImageLayer);  
             winformsMap1.Overlays.Add("testOverlay", testOverlay);  
 
             winformsMap1.Refresh();  
         }  
 
         void MainForm_StreamLoading(object sender, StreamLoadingEventArgs e)  
         {  
             if (e.StreamType == "Image File")  
             {  
                 Stream stream = new FileStream(@"..\..\Data\world.tif", FileMode.Open, FileAccess.Read);  
                 e.AlternateStream = stream;  
             }  
 
             if (e.StreamType == "World File")  
             {  
                 Stream stream = new FileStream(@"..\..\Data\world.tfw", FileMode.Open, FileAccess.Read);  
                 e.AlternateStream = stream;  
             }  
         }  
 
 
         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();  
         }  
 
     }  
 }