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GMap.NET - Great Maps for Windows Forms and Presentation

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4.80/5 (136 votes)
16 Apr 2013MIT1 min read 1.8M   615   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

 
AnswerRe: Google approved? Pin
radioman.lt11-Mar-11 9:05
radioman.lt11-Mar-11 9:05 
GeneralJust to say Thanks again Pin
Member 22817717-Jan-11 21:52
Member 22817717-Jan-11 21:52 
Generalx86 target Pin
ric944-Jan-11 10:58
ric944-Jan-11 10:58 
GeneralRe: x86 target Pin
radioman.lt4-Jan-11 12:13
radioman.lt4-Jan-11 12:13 
GeneralRe: x86 target Pin
radioman.lt23-Nov-11 10:39
radioman.lt23-Nov-11 10:39 
GeneralMy vote of 1 Pin
Nazmi Altun21-Dec-10 9:44
Nazmi Altun21-Dec-10 9:44 
GeneralRe: My vote of 1 Pin
radioman.lt4-Jan-11 12:14
radioman.lt4-Jan-11 12:14 
GeneralWorks like Magic . Thanks so much . Pin
Member 228177121-Dec-10 8:38
Member 228177121-Dec-10 8:38 
Dear radioman ,

First of all , Thanks so much . for this control . It really works like Magic . I do not know really how someone idiot like the guy from the previous post was not convinced about such great tool . Thanks again .

I would like to know if the control support caching the maps into separate tiles that are save separately into the hard-disk . I know that it took you much time to save the images into SQLlite database , but the problem is that when working with the images stored into the SQLlite database file , it is much slower that when the images are saved as standalone separate image files.

This is case as a program called GMapCatcher , although your program is much much much better .


Thanks

WSN
GeneralRe: Works like Magic . Thanks so much . Pin
radioman.lt21-Dec-10 9:43
radioman.lt21-Dec-10 9:43 
GeneralRe: Works like Magic . Thanks so much . Pin
Member 228177121-Dec-10 13:06
Member 228177121-Dec-10 13:06 
GeneralRe: Works like Magic . Thanks so much . Pin
radioman.lt21-Dec-10 20:51
radioman.lt21-Dec-10 20:51 
GeneralThis sucks Pin
Sam Dahan9-Nov-10 7:02
Sam Dahan9-Nov-10 7:02 
GeneralRe: This sucks Pin
radioman.lt9-Nov-10 7:29
radioman.lt9-Nov-10 7:29 
GeneralRe: This sucks Pin
radioman.lt9-Nov-10 7:37
radioman.lt9-Nov-10 7:37 
GeneralRe: This sucks Pin
Jane11011010-Nov-10 9:11
Jane11011010-Nov-10 9:11 
GeneralThanks for a excellent piece of work. Pin
AllanMunro28-Oct-10 7:45
AllanMunro28-Oct-10 7:45 
GeneralMy vote of 5 Pin
iskandar700727-Jul-10 18:47
iskandar700727-Jul-10 18:47 
QuestionAre you mad? Pin
Jim Buckley Barrett22-Apr-10 6:12
Jim Buckley Barrett22-Apr-10 6:12 
AnswerRe: Are you mad? Pin
radioman.lt22-Apr-10 7:27
radioman.lt22-Apr-10 7:27 
GeneralRe: Are you mad? Pin
Jim Buckley Barrett22-Apr-10 22:10
Jim Buckley Barrett22-Apr-10 22:10 
GeneralRe: Are you mad? Pin
franva3-Jun-10 20:57
franva3-Jun-10 20:57 
GeneralSafety of Core class Pin
Bernhard Hiller1-Apr-10 4:49
Bernhard Hiller1-Apr-10 4:49 
GeneralRe: Safety of Core class Pin
radioman.lt1-Apr-10 5:36
radioman.lt1-Apr-10 5:36 
GeneralRe: Safety of Core class Pin
Bernhard Hiller4-Apr-10 22:31
Bernhard Hiller4-Apr-10 22:31 
GeneralRe: Safety of Core class [modified] Pin
radioman.lt5-Apr-10 2:01
radioman.lt5-Apr-10 2:01 

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