What’s more fun than popping balloons? Last week at CouchConf SF, we demo’ed an experimental social game app (Pop-it) powered by Couchbase Server 2.0 (Beta). It is a HTML5 browser app with a C#.Net game server.

Check out the game in action – http://www.youtube.com/watch?v=13nCv_AMCi0

Now that you’ve seen how addictive this game can get, let me get into how it actually works! The game server senses hand joint locations using the Microsoft Kinect Sensor and streams the coordinates of the hand joints to the client using websockets. The client renders balloons using javascript and performs collision detection between the balloon objects and the hand joint points. Basically, you touch the balloons to pop them and gain points. At the end of the game, Couchbase Server is used to store the player points. The client sends the score and player name to the server and the C# application writes this data into Couchbase. To store the score, we create a GameResult object as shown below:

 

Kinect1

Then using the C#.Net client for Couchbase Server 2.0, we write this data into Couchbase Server using:

var gameResult = new GameResult { Name = name, Score = score };

//Create a timestamp key
TimeSpan t = (DateTime.UtcNow – new DateTime(1970, 1, 1));
int timestamp = (int) t.TotalSeconds;

//Call the StoreJSON client method to store the score in Couchbase
m_cclient.StoreJson(StoreMode.Set, timestamp.ToString(), gameResult);

Now that the score is stored in Couchbase Server, by using the indexing and querying features in 2.0, a real-time leaderboard can be generated so that players can track their progress. The map function to create a leaderboard in Couchbase Server looks like below: 

LeaderboardPopIt

 

The map function emits the score of the player and the name of the player. The C# application can query the view, sort it using the descending modifier and limit the number of results (top 10 players in this case).

public ActionResult Index () {

var view = _client.GetView(“scoreboard”, “by_score”, true).Descending(true).Limit(10);

return Json(view.ToArray(), JsonRequestBehavior.AllowGet);

}

Feel like playing? Download the code here, compile it and enjoy ! (If you don’t have a Kinect, no problem, mouse-clicks on the balloons also work). Here are the top players from CouchConf SF. 

 

WinnersPopIt

Congratulations Pop-It champions!

 

Author

Posted by Don Pinto, Principal Product Manager, Couchbase

Don Pinto is a Principal Product Manager at Couchbase and is currently focused on advancing the capabilities of Couchbase Server. He is extremely passionate about data technology, and in the past has authored several articles on Couchbase Server including technical blogs and white papers. Prior to joining Couchbase, Don spent several years at IBM where he maintained the role of software developer in the DB2 information management group and most recently as a program manager on the SQL Server team at Microsoft. Don holds a master's degree in computer science and a bachelor's in computer engineering from the University of Toronto, Canada.

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