source code for zoom window(c#.net)

[murry19830507]

i want creat an web application(c#.net),which contains an image and one radiobutton list with 3 radiobuttons(zoom in ,zoom out ,zoom window)
when user checked on zoom in
imge has to be zoom
inthe similar manner when zoom window is checked,it allow to create a rectangle window by using mouse pressed and released.and particular area of the map/image must be zoomed


or my source code writen bellow.

using System;
using System.Data;
using System.Drawing;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
public partial class Simple : System.Web.UI.Page
{
    private SharpMap.Map myMap;
 
    protected void Page_Load(object sender, EventArgs e)
    {
        //Set up the map. We use the method in the App_Code folder for initializing the map
        myMap = MapHelper.InitializeMap(new System.Drawing.Size((int)imgMap.Width.Value,(int)imgMap.Height.Value));
        if (Page.IsPostBack) 
        {
            //Page is post back. Restore center and zoom-values from viewstate
            myMap.Center = (SharpMap.Geometries.Point)ViewState["mapCenter"];
            myMap.Zoom = (double)ViewState["mapZoom"];
        }
        else
        {
            //This is the initial view of the map. Zoom to the extents of the map:
            //myMap.ZoomToExtents();
            //or center on 0,0 and zoom to full earth (360 degrees)
            //myMap.Center = new SharpMap.Geometries.Point(0,0);
            //myMap.Zoom = 360;
            //Create the map
            GenerateMap();
        }
    }
 
    protected void imgMap_Click(object sender, ImageClickEventArgs e)
    {
        //Set center of the map to where the client clicked
        myMap.Center = myMap.ImageToWorld(new System.Drawing.Point(e.X, e.Y));
        //Set zoom value if any of the zoom tools were selected
        if (rblMapTools.SelectedValue == "0") //Zoom in
            myMap.Zoom = myMap.Zoom * 0.5;
         if (rblMapTools.SelectedValue == "1") //Zoom out
            myMap.Zoom = myMap.Zoom * 2;
        else if (rblMapTools.SelectedValue == "3") // Zoom Extent
            myMap.ZoomToExtents();
 
        //Create the map
        GenerateMap();
    }
 
    /// <summary>
    /// Creates the map, inserts it into the cache and sets the ImageButton Url
    /// </summary>
    private void GenerateMap()
    {
        //Save the current mapcenter and zoom in the viewstate
        ViewState.Add("mapCenter", myMap.Center);
        ViewState.Add("mapZoom", myMap.Zoom);
        //Render map
        System.Drawing.Image img = myMap.GetMap();
        string imgID = SharpMap.Web.Caching.InsertIntoCache(1, img);
        imgMap.ImageUrl = "getmap.aspx?ID=" + HttpUtility.UrlEncode(imgID);
    }
 
}
 replay