using System;
using System.Globalization;
using System.Configuration;
using System.Collections.ObjectModel;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.WebEdition;
namespace DetectGPS
{
    public partial class TestForm : System.Web.UI.Page
    {
        Collection<PointShape> GPSlocations = new Collection<PointShape>();
        int index;
        WebImage webImage = null;
        WebImage webImage2 = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Map1.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"));
                Map1.CurrentExtent = new RectangleShape(-95.3018,38.9647,-95.2818,38.9534);
                Map1.MapUnit = GeographyUnit.DecimalDegree;
                WorldMapKitWmsWebOverlay overlay = new WorldMapKitWmsWebOverlay();
                Map1.CustomOverlays.Add(overlay);
                //InMemoryFeatureLayer for the two reference points en red.
                InMemoryFeatureLayer pointLayer = new InMemoryFeatureLayer();
                pointLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.CreateSimpleCircleStyle(GeoColor.StandardColors.Red, 12, GeoColor.StandardColors.Black);
                pointLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                Feature feature1 = new Feature(new PointShape(-95.2949, 38.957));
                Feature feature2 = new Feature(new PointShape(-95.2883, 38.957));
                pointLayer.InternalFeatures.Add(feature1);
                pointLayer.InternalFeatures.Add(feature2);
                LayerOverlay pointOverlay = new LayerOverlay("PointOverlay");
                pointOverlay.Layers.Add("PointLayer", pointLayer);
                pointOverlay.IsBaseOverlay = false;
                Map1.CustomOverlays.Add(pointOverlay);
                //Collection of PointShapes for the GPS locations.
                GPSlocations.Add(new PointShape(-95.2946, 38.9602));
                GPSlocations.Add(new PointShape(-95.2928, 38.9602));
                GPSlocations.Add(new PointShape( -95.2903,38.9602));
                GPSlocations.Add(new PointShape(-95.2883,38.9602));
                GPSlocations.Add(new PointShape(-95.2883,38.9587));
                GPSlocations.Add(new PointShape(-95.2883,38.957));
                GPSlocations.Add(new PointShape(-95.2897,38.957));
                GPSlocations.Add(new PointShape(-95.2918,38.957));
                GPSlocations.Add(new PointShape(-95.2934,38.957));
                GPSlocations.Add(new PointShape(-95.2947,38.957));
                GPSlocations.Add(new PointShape(-95.2946,38.9582));
                GPSlocations.Add(new PointShape(-95.2946,38.9593));
                //SimpleMarkerOverlay for autorefresh GPS locations
                SimpleMarkerOverlay markerOverlay = new SimpleMarkerOverlay("MarkerOverlay");
                markerOverlay.AutoRefreshInterval = TimeSpan.FromMilliseconds(1000);
                markerOverlay.Tick += new EventHandler<EventArgs>(markerOverlay_Tick);
                webImage = new WebImage("/Images/top.png");
                webImage2 = new WebImage("/Images/top2.png");
                markerOverlay.Markers.Add(new Marker(new PointShape(-95.2946, 38.9602), webImage));
                Map1.CustomOverlays.Add(markerOverlay);
             }
        }
        void markerOverlay_Tick(object sender, EventArgs e)
        {
            if (index == GPSlocations.Count - 1) { index = 0; }
            else { index = index + 1; }
            LayerOverlay pointOverlay = (LayerOverlay)Map1.CustomOverlays["PointOverlay"];
            InMemoryFeatureLayer pointLayer = (InMemoryFeatureLayer)pointOverlay.Layers["PointLayer"];
            SimpleMarkerOverlay markerOverlay = (SimpleMarkerOverlay)Map1.CustomOverlays["MarkerOverlay"];
            double lon = GPSlocations[index].X;
            double lat = GPSlocations[index].Y;
            markerOverlay.Markers[0].Position = new PointShape(lon, lat);
            //If the new GPS location is within 200 meters of a reference point, it displays with a different icon.
            pointLayer.Open();
            Collection<Feature> features = pointLayer.QueryTools.GetFeaturesWithinDistanceOf(new PointShape(lon, lat), Map1.MapUnit,
                                                                            DistanceUnit.Meter, 200, ReturningColumnsType.NoColumns);
            pointLayer.Close();
            if (features.Count > 0)
            {
                markerOverlay.Markers[0].WebImage = webImage2;
            }
            else
            {
                markerOverlay.Markers[0].WebImage = webImage;
            }
          }
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestForm.aspx.cs" Inherits="DetectGPS.TestForm" %>
<%@ Register Assembly="WebEdition" Namespace="ThinkGeo.MapSuite.WebEdition" TagPrefix="cc1" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <link href="~/theme/default/samplepic/style.css" rel="stylesheet" type="text/css" />
    <title>Detect GPS</title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <cc1:Map ID="Map1" runat="server" Height="100%" Width="100%">
    </cc1:Map>
   <%-- <description:descriptionpanel ID="DescPanel" runat="server">
        This sample displays a google map. Click buttons below to switch between different Google maps.
        <br />
        <br />
        <asp:Button CssClass="btn" ID="btnRoad" runat="server" Text="Normal" OnClientClick="Map1.SetCurrentBackgroundMapType(G_NORMAL_MAP); return false;" />
        <asp:Button CssClass="btn" ID="btnAerial" runat="server" Text="Hybrid" OnClientClick="Map1.SetCurrentBackgroundMapType(G_HYBRID_MAP); return false;" /><br />
        <asp:Button CssClass="btn" ID="btnSatellite" runat="server" Text="Satellite" OnClientClick="Map1.SetCurrentBackgroundMapType(G_SATELLITE_MAP); return false;" />
        <asp:Button CssClass="btn" ID="btnPhysical" runat="server" Text="Physical" OnClientClick="Map1.SetCurrentBackgroundMapType(G_PHYSICAL_MAP); return false;" />
    </description:descriptionpanel>--%>
    </form>
</body>
</html>