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GMap.NET - Great Maps for Windows Forms and Presentation

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16 Apr 2013MIT1 min read 1.8M   614   508   373
GMap.NET is a powerful, free, cross platform, Open Source .NET control. It enables the use of routing, geocoding, and maps from Google, Yahoo!, OpenStreet in Windows Forms and Presentation, and supports caching!

GMapNET/GMapNETv7cp.PNG

Introduction

Google Maps are cool, yeah? But it's useful only in the browser, and is insufficient for real time tracking. It also does not have cache so Google servers are overloaded. This control removes all these deficiencies! It also gives the .NET developer unlimited ability to extend it!

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding, directions and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex, Mapy.cz, Maps.lt, iKarte.lv, NearMap, OviMap, CloudMade, WikiMapia, MapQuest in Windows Forms & Presentation, supports caching and runs on windows mobile! 

Background

The basic idea is simple: get the required data from Google/etc., cache it, and use it. Fast, simple, and practical.

Using the Code

It's more than easy. GMap.NET.dll and GMap.NET.WindowsForms.dll contain the user control. Add it to your project and simply use it.

Here are the basic control initial options: 

C#
public MainForm()
{

InitializeComponent();

try
{
   System.Net.IPHostEntry e =
        System.Net.Dns.GetHostEntry("www.google.com");
}
catch
{
   MainMap.Manager.Mode = AccessMode.CacheOnly;
   MessageBox.Show("No internet connection avaible, going to CacheOnly mode.", 
         "GMap.NET - Demo.WindowsForms", MessageBoxButtons.OK,
         MessageBoxIcon.Warning);
}

// config map
MainMap.MapProvider = GMapProviders.OpenStreetMap;
MainMap.Position = new PointLatLng(54.6961334816182, 25.2985095977783);
MainMap.MinZoom = 0;
MainMap.MaxZoom = 24;
MainMap.Zoom = 9;

// add your custom map db provider
//GMap.NET.CacheProviders.MySQLPureImageCache ch = new GMap.NET.CacheProviders.MySQLPureImageCache();
//ch.ConnectionString = @"server=sql2008;User Id=trolis;Persist Security Info=True;database=gmapnetcache;password=trolis;";
//MainMap.Manager.SecondaryCache = ch;

// set your proxy here if need
//GMapProvider.WebProxy = new WebProxy("10.2.0.100", 8080);
//GMapProvider.WebProxy.Credentials = new NetworkCredential("ogrenci@bilgeadam.com", "bilgeada");

// map events
{
   MainMap.OnPositionChanged += new PositionChanged(MainMap_OnPositionChanged);

   MainMap.OnTileLoadStart += new TileLoadStart(MainMap_OnTileLoadStart);
   MainMap.OnTileLoadComplete += new TileLoadComplete(MainMap_OnTileLoadComplete);

   MainMap.OnMapZoomChanged += new MapZoomChanged(MainMap_OnMapZoomChanged);
   MainMap.OnMapTypeChanged += new MapTypeChanged(MainMap_OnMapTypeChanged);

   MainMap.OnMarkerClick += new MarkerClick(MainMap_OnMarkerClick);
   MainMap.OnMarkerEnter += new MarkerEnter(MainMap_OnMarkerEnter);
   MainMap.OnMarkerLeave += new MarkerLeave(MainMap_OnMarkerLeave);

   MainMap.OnPolygonEnter += new PolygonEnter(MainMap_OnPolygonEnter);
   MainMap.OnPolygonLeave += new PolygonLeave(MainMap_OnPolygonLeave);

   MainMap.OnRouteEnter += new RouteEnter(MainMap_OnRouteEnter);
   MainMap.OnRouteLeave += new RouteLeave(MainMap_OnRouteLeave);

   MainMap.Manager.OnTileCacheComplete += new TileCacheComplete(OnTileCacheComplete);
   MainMap.Manager.OnTileCacheStart += new TileCacheStart(OnTileCacheStart);
   MainMap.Manager.OnTileCacheProgress += new TileCacheProgress(OnTileCacheProgress);
}   
} 

As you can see, the control options are quite simple. And there is nothing more to add.

Points of Interest

Well, it was quite cryptic to figure out how Google manages tiles, what coordinate system it uses, the JSON decryption, etc.

History

Go to the project's CodePlex site to get a running update of any changes or improvements I've made.  

License

This article, along with any associated source code and files, is licensed under The MIT License


Written By
Software Developer
Lithuania Lithuania
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Comments and Discussions

 
GeneralRe: Is it possible to change opacity of map? Pin
Joe Sonderegger3-May-11 0:34
Joe Sonderegger3-May-11 0:34 
GeneralRe: Is it possible to change opacity of map? Pin
radioman.lt3-May-11 0:41
radioman.lt3-May-11 0:41 
GeneralRe: Is it possible to change opacity of map? Pin
Joe Sonderegger11-May-11 23:34
Joe Sonderegger11-May-11 23:34 
QuestionGoogle Maps zoom slider Pin
p4t0721-Apr-11 11:50
p4t0721-Apr-11 11:50 
AnswerRe: Google Maps zoom slider Pin
radioman.lt21-Apr-11 19:27
radioman.lt21-Apr-11 19:27 
GeneralHow to make the control active or inactive Pin
Member 228177120-Apr-11 8:36
Member 228177120-Apr-11 8:36 
GeneralRe: How to make the control active or inactive Pin
radioman.lt20-Apr-11 21:33
radioman.lt20-Apr-11 21:33 
GeneralRe: How to make the control active or inactive Pin
Member 228177120-Apr-11 21:40
Member 228177120-Apr-11 21:40 
Ok , but how to make the map control instance active/inactive .Actually , when I put the map control into the form , it always connects to the net and download data , even without making any code.


Thanks for your continuous support.
GeneralRe: How to make the control active or inactive Pin
radioman.lt20-Apr-11 21:47
radioman.lt20-Apr-11 21:47 
GeneralRe: How to make the control active or inactive Pin
Member 228177120-Apr-11 22:05
Member 228177120-Apr-11 22:05 
GeneralHow to display a route Pin
Member 228177119-Apr-11 23:45
Member 228177119-Apr-11 23:45 
GeneralRe: How to display a route Pin
radioman.lt20-Apr-11 0:48
radioman.lt20-Apr-11 0:48 
GeneralRe: How to display a route Pin
Member 228177120-Apr-11 6:23
Member 228177120-Apr-11 6:23 
GeneralRe: How to display a route Pin
radioman.lt20-Apr-11 7:13
radioman.lt20-Apr-11 7:13 
GeneralRe: How to display a route Pin
Member 228177120-Apr-11 8:22
Member 228177120-Apr-11 8:22 
GeneralRe: How to display a route Pin
tataivt_884-May-11 16:07
tataivt_884-May-11 16:07 
GeneralRe: How to display a route Pin
radioman.lt4-May-11 23:26
radioman.lt4-May-11 23:26 
GeneralException and question Pin
serhhio14-Apr-11 5:12
serhhio14-Apr-11 5:12 
GeneralRe: Exception and question Pin
radioman.lt14-Apr-11 9:12
radioman.lt14-Apr-11 9:12 
GeneralRe: Exception and question Pin
serhhio14-Apr-11 23:04
serhhio14-Apr-11 23:04 
QuestionException: SingletonCreator and singning Pin
serhhio14-Apr-11 4:00
serhhio14-Apr-11 4:00 
AnswerRe: Exception: SingletonCreator and singning Pin
radioman.lt14-Apr-11 4:09
radioman.lt14-Apr-11 4:09 
GeneralRe: Exception: SingletonCreator and singning Pin
serhhio14-Apr-11 4:22
serhhio14-Apr-11 4:22 
GeneralVilnus Transport throwing exceptions Pin
serhhio13-Apr-11 23:33
serhhio13-Apr-11 23:33 
GeneralRe: Vilnus Transport throwing exceptions Pin
radioman.lt14-Apr-11 0:06
radioman.lt14-Apr-11 0:06 

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