Static Google Maps Web Control

using System.Drawing;
using System.Security.Permissions;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using System.Web;
using System.Web.UI;
using System.Collections.Specialized;
using System.Web.UI.WebControls;

namespace WCM.Core.Controls
{
    [ToolboxData("<{0}:GoogleMap runat=server></{0}:GoogleMap>")]
    public class GoogleMap : ControlBase, IPostBackEventHandler
    {

        public Unit Height
        {
            get
            {
                object value = ViewState["Height"];
                if (value == null) { return new Unit(400, UnitType.Pixel); }
                return (Unit)value;
            }
            set { ViewState["Height"] = value; }
        }

        public Unit Width
        {
            get
            {
                object value = ViewState["Width"];
                if (value == null) { return new Unit(600, UnitType.Pixel); }
                return (Unit)value;
            }
            set { ViewState["Width"] = value; }
        }

        public System.Int64 Latitude
        {
            get
            {
                object value = ViewState["Latitude"];
                if (value == null) { return 0; }
                return (System.Int64)value;
            }
            set { ViewState["Latitude"] = value; }
        }

        public bool ShowControlPanel
        {
            get
            {
                object value = ViewState["ShowControlPanel"];
                if (value == null) { return true; }
                return (bool)value;
            }
            set { ViewState["ShowControlPanel"] = value; }
        }

        public System.Int64 Longitude
        {
            get
            {
                object value = ViewState["Longitude"];
                if (value == null) { return 0; }
                return (System.Int64)value;
            }
            set { ViewState["Longitude"] = value; }
        }

        public int Zoom
        {
            get
            {
                object value = ViewState["Zoom"];
                if (value == null) { return 9600; }
                return (int)value;
            }
            set { ViewState["Zoom"] = value; }
        }

        public MapZoomLevel ZoomLevel
        {
            get
            {
                switch (this.Zoom)
                {
                    case 1200: return MapZoomLevel.Level0;
                    case 2400: return MapZoomLevel.Level1;
                    case 4800: return MapZoomLevel.Level2;
                    case 9600: return MapZoomLevel.Level3;
                    case 19200: return MapZoomLevel.Level4;
                    case 38400: return MapZoomLevel.Level5;
                    case 76800: return MapZoomLevel.Level6;
                    case 180000: return MapZoomLevel.Level7;
                    case 600000: return MapZoomLevel.Level8;
                    case 1800000: return MapZoomLevel.Level9;
                }
                return MapZoomLevel.Custom;
            }
            set
            {
                int zoom1 = GetZoomLevel(value);
                this.Zoom = zoom1;
            }
        }

        public string ToolTipText
        {
            get
            {
                object value = ViewState["ToolTipText"];
                if (value == null) { return ""; }
                return (string)value;
            }
            set
            {
                ViewState["ToolTipText"] = value;
            }
        }

        private const string mapurl = "http://maps.google.com/mapdata?latitude_e6={0}&longitude_e6={1}&zm={2}&w={3}&h={4}&cc=&min_priority=2";


        private int GetZoomLevel(MapZoomLevel value)
        {
            switch (value)
            {
                case MapZoomLevel.Level0: return 1200;
                case MapZoomLevel.Level1: return 2400;
                case MapZoomLevel.Level2: return 4800;
                case MapZoomLevel.Level3: return 9600;
                case MapZoomLevel.Level4: return 19200;
                case MapZoomLevel.Level5: return 38400;
                case MapZoomLevel.Level6: return 76800;
                case MapZoomLevel.Level7: return 180000;
                case MapZoomLevel.Level8: return 600000;
                case MapZoomLevel.Level9: return 1800000;
                case MapZoomLevel.Custom: return this.Zoom;
            }
            return this.Zoom;
        }

        protected override void Render(HtmlTextWriter writer)
        {
            writer.AddAttribute("border", "0");
            writer.AddAttribute("cellpadding", "0");
            writer.AddAttribute("cellspacing", "0");
            writer.RenderBeginTag("table");
            writer.RenderBeginTag("tr");
            writer.RenderBeginTag("td");
            writer.AddAttribute("id", this.ClientID);
            writer.AddAttribute("width", this.Width.ToString());
            writer.AddAttribute("height", this.Height.ToString());
            writer.AddAttribute("alt", this.ToolTipText);
            writer.AddAttribute("src", string.Format(mapurl, this.Latitude, this.Longitude, this.Zoom, this.Width.Value, this.Height.Value));
            writer.RenderBeginTag("img");
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderEndTag();

            if (this.ShowControlPanel)
            {
                writer.AddStyleAttribute("background-color","#eeeeee");
                writer.RenderBeginTag("tr");
                writer.RenderBeginTag("td");
                writer.Write("Zoom:");
                for (var i = 0; i < 10; i++)
                {
                    if (i == (int)ZoomLevel) { writer.AddStyleAttribute("background-color", "#0A246A"); writer.AddStyleAttribute("color", "white"); } else { writer.AddStyleAttribute("color", "black"); }
                    writer.AddStyleAttribute("font-size", "14px");                    
                    writer.AddAttribute("href", Page.ClientScript.GetPostBackClientHyperlink(this, "Zoom$" + i.ToString()));
                    writer.AddAttribute ("title", GetZoomLevel((MapZoomLevel)i).ToString() + " Feet.");
                    writer.RenderBeginTag("a");
                    writer.Write(" " + i.ToString() + " ");
                    writer.RenderEndTag();
                    writer.Write("&nbsp;");
                }
                writer.RenderEndTag();
                writer.RenderEndTag();
            }

            writer.RenderEndTag();
        }

        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument)
        {
            string[] parameters = eventArgument.Split(new string[] { "$" }, StringSplitOptions.None);
            switch (parameters[0].ToLower())
            {
                case "zoom":
                    this.ZoomLevel = (MapZoomLevel)Convert.ToInt32(parameters[1]);  break;
            }
        }
    }

    public enum MapZoomLevel
    {
        Level0, Level1, Level2, Level3, Level4, Level5, Level6, Level7, Level8, Level9, Custom
    }
}