Answer: PhysicsEditor

The PhysicsEditor is a shape editor for physics engines like Box2D and Chipmunk.

Before when I was making physics objects in Cocos2D, I used VertexHelper (Johannes Fahrenkrug), which is great and all, but there were a lot of things that you had to consider, such as you had to define the vertices yourself (meaning: ‘click “around” each sprite to define it’s vertices’) and you have to make sure that you don’t accidentally create any concave polygons (what are concave polygons again? check Wikipedia), and then you have to copy paste the generated code into your project. VertexHelper served me well and all, and it was free.

But PhysicsEditor did make me life a whole lot easier.

Andreas Loew wrote tutorials on his blog on how to use PhysicsEditor with Cocos2D:

• http://www.physicseditor.de/cocos2d-box2d/
• http://www.physicseditor.de/2011/03/07/chipmunk-generic-loader-chipmunk-cocos2d-demo/

So I used random.org to draw the winners… and the winners are… *drumroll*…

• tetna
• win_t
• mishta
• cocos2Developer

Since I allowed different ways to enter my contest, some of the winners on the list are from the cocos2d forums, while some are on Twitter.

So winners, please contact me (or check your forum messages or DMs) :)

“Cocos2d for iPhone 1 Game Development Cookbook” is written by Nathan Burba (@nathanburba).

According to the description, it has “over 90 recipes for iOS 2D game development using cocos2d”. and just by looking at it’s Table of Contents, you’d see that this book covers a lot of topics (some advanced techniques that other cocos2d books have not covered). It also provides solutions to some common problems that we developers might encounter during Cocos2d iOS development.

Like in Chapter 1, it covers graphics, but unlike other books that would only teach you how to make sprites and spritesheets, this book even teaches you how to use apply mipmapping so that that when you scale up or down a sprite it wouldn’t look pixelated. It also has a recipe for a cool technique by swapping palettes so that even with limited amount of art, you can create various versions of a sprite (a single baseball player texture can have be used to create different baseball players with different colored shirts and pants etc). Chapter 1 also answers some questions that you might encounter while working on your game, such as how to I play a video clip of my company’s logo or my game’s cutscene (playing video files recipe). It also covers how to render 3D objects, drawing OpenGL primitives, particles, etc.

Chapter 2 is all about User Input on iOS devices, including the usual (tap, hold, drag), making virtual buttons (creating an analog stick recipe and directional pad recipe) and using the accelerometer. One really cool (for me) recipe that’s also included is gestures (you’d be able to tell what shape the user drew on the screen)!

Chapter 3 is about Files and Data. In making games, we’d need ways to store data (just us score, or level design, etc) and this chapter covers different ways for us to do this. This chapter has recipes for reading plist, json, xml data files, it also includes recipes about archiving objects, saving data using plist, SQLite, Core Data, etc.

Chapter 4 is about physics. Cocos2d has two physics engines that we can use Box2d and Chipmunk. This book only covers Box2d (which is the engine that Angry Birds used), it includes detailed explanations and recipes on how to set up your Box2d environment and simulating physics properties. it even includes a recipe on how to make a car drive up a bumpy hill road!

Chapter 5 is about Scenes and Menus. It also includes how to create buttons and labels (with fancy shadow effects even)! It also has a recipe for wrapping the UIKIT and using it in our Cocos2d game.

Chapter 6 is all about Audio: how to play background sound effects, play music, using the iPod music library. But the really fun bits about this chapter is it even teaches you how to record audio, create a MIDI synthesizer, and to top it all off, it even covers spech recognition and text to speech! Imagine all the games and apps that you can make with those things.

Chapter 7 covers AI, including waypoints, flocking using boids and A* pathfinding. it also teaches you how to run lua scripts and use lua scripts for dialog trees.

Chapter 8 is called Tips, Tools and Ports, and sure enough it includes information about tools that can be used for our Cocos2d game development. Best part, it also includes detailed step by step instructions of how to put your game on the AppStore!

Overall this is a good book with a lot of useful and varied information that have not been covered in other books (and are often lacking in online tutorials). Also

the best thing about this book is it comes with complete working code and detailed explanations on how the code works.

Except some of the topics covered in this book are a bit advanced, so this book is not recommended for beginners, basic Objective C and Cocos2d knowledge is required.

Also the author, Nathan is also very active in the Cocos2d forums, if you have any questions about the book you can just ask him, and he almost always responds immediately.

So if you’re interested to learn new things about Cocos2d iOS development, do check it out! Also if you are interested in this book, I am holding a giveaway contest (where I am giving away 3-4 copies of the book), join now (it’s only until this Wednesday). For more details read my previous blog post (http://purplelilgirl.tumblr.com/post/15713172087/cocos2d-for-iphone-1-game-development-cookbook-giveaway)

Link: http://www.packtpub.com/cocos2d-for-iphone-1-game-development-cookbook/book

UPDATE: This contest is now closed

Like I mentioned in my previous post, Packt published a new Cocos2d book and they asked me to hold a giveaway contest. I’m holding it both here and in the Cocos2d forums (http://www.cocos2d-iphone.org/forum/topic/28099).

So here it is, rules, rules:

• Just visit the Packt book page http://www.packtpub.com/cocos2d-for-iphone-1-game-development-cookbook/book and list one particular feature that makes you want to own the book, and list it as a comment EDIT: here (tumblr blog) or cocos2d forum thread (http://www.cocos2d-iphone.org/forum/topic/28099) or tweet me (@purplelilgirl) or email me (purplelittlegirl@yahoo.com)
• Also tweet the Packt book link: “New book on cocos2d game development: http://www.packtpub.com/cocos2d-for-iphone-1-game-development-cookbook/book”.

• I will select a winner using random.org :)

• Contest ends on 12 Noon Pacific Standard Time January 18th.

There, pretty simple right? :)

Also ManiacDev is also holding a book giveaway contest, he is giving away Unity3D and iOS books. If you guys are interested you can check out his blog: http://maniacdev.com/2012/01/giveaway-get-a-unity-3d-or-ios-book-there-will-be-6-winners-enter-here/

That’s about it :)

Packt recently released a new Cocos2d book: “Cocos2d for iPhone 1 Game Development Cookbook” by Nathan Burba.

Overview of Cocos2d for iPhone 1 Game Development Cookbook

• Discover advanced Cocos2d, OpenGL ES, and iOS techniques spanning all areas of the game development process
• Learn how to create top-down isometric games, side-scrolling platformers, and games with realistic lighting
• Full of fun and engaging recipes with modular libraries that can be plugged into your project
• Over 90 recipes for iOS 2D game development using cocos2d

Link: http://www.packtpub.com/cocos2d-for-iphone-1-game-development-cookbook/book

Okay, so I figured out how to add audio to my video.

In my previous blog post (http://purplelilgirl.tumblr.com/post/10974345146/mini-tutorial-how-to-capture-video-of-iphone-app-in), I managed to take a video of my app and save it into a file. However I am just stringing together screenshots of my app taken at every 0.1 second, so it doesn’t capture the audio.

So I have a different function that is capturing my audio (AVAudioRecorder), and saving that into a file.

Now, to combine the files together. Since iOS 4.1, AVFoundation included this thing called AVMutableComposition, and with that you can make composites of stuff, like combine video and audio files together to make a new video file that has audio.

So code bits (I found bits of the code in StackOverflow):

-(void) processVideo: (NSURL*) videoUrl
{  
    AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL: videoUrl options:nil];
   
    AVMutableComposition* mixComposition = [AVMutableComposition composition];
   
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
   
    NSError * error = nil;
   
    for (NSMutableDictionary * audioInfo in appDelegate.audioInfoArray)
    {
        NSString *pathString = [[NSHomeDirectory() stringByAppendingString:@”/Documents/”] stringByAppendingString: [audioInfo objectForKey: @”fileName”]];
       
        AVURLAsset * urlAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:pathString] options:nil];
       
        AVAssetTrack * audioAssetTrack = [[urlAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
        AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
                                                                                       preferredTrackID: kCMPersistentTrackID_Invalid];
       
        NSLog(@”%lf”, [[audioInfo objectForKey: @”startTime”] doubleValue]);
       
        CMTime audioStartTime = CMTimeMake(([[audioInfo objectForKey: @”startTime”] doubleValue]*TIME_SCALE), TIME_SCALE);
       
        [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero,urlAsset.duration) ofTrack:audioAssetTrack atTime:audioStartTime error:&error];     
    }
   
   
    AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
                                                                                   preferredTrackID:kCMPersistentTrackID_Invalid];
    [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
                                   ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
                                    atTime:kCMTimeZero error:nil];
   
    AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition
                                                                          presetName:AVAssetExportPresetPassthrough];  
   
    NSString* videoName = @”export.mov”;
   
    NSString *exportPath = [[self pathToDocumentsDirectory] stringByAppendingPathComponent:videoName];
    NSURL    *exportUrl = [NSURL fileURLWithPath:exportPath];
   
    if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath])
    {
        [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
    }
   
    _assetExport.outputFileType = @”com.apple.quicktime-movie”;
    NSLog(@”file type %@”,_assetExport.outputFileType);
    _assetExport.outputURL = exportUrl;
    _assetExport.shouldOptimizeForNetworkUse = YES;
   
    [_assetExport exportAsynchronouslyWithCompletionHandler:
     ^(void ) {
         switch (_assetExport.status)
         {
             case AVAssetExportSessionStatusCompleted:
                 //export complete
                 NSLog(@”Export Complete”);
                 //[self uploadToYouTube];
                
                 break;
             case AVAssetExportSessionStatusFailed:
                 NSLog(@”Export Failed”);
                 NSLog(@”ExportSessionError: %@”, [_assetExport.error localizedDescription]);
                 //export error (see exportSession.error) 
                 break;
             case AVAssetExportSessionStatusCancelled:
                 NSLog(@”Export Failed”);
                 NSLog(@”ExportSessionError: %@”, [_assetExport.error localizedDescription]);
                 //export cancelled 
                 break;
         }
     }];   
}

I have more than one audio file that I want to combine with my video, so I created a array file that contains information for each of the audio files (such as where the file is located and when to play that audio).

And that’s it :) You have a video of your app :) with audio :)

Someone asked me before if I knew how to do record the screen in Cocos2d as a video. I didn’t know how to record a video, so this guy sent me some codes, but his problem is that his code is recording the screen (taking screenshots) as a UIWindow. So my idea for him was to replace his screenshot code with AWScreenshot (by Manucorporat, search the Cocos2d forums for his code).

And here are the code bits:

#import <AVFoundation/AVFoundation.h>
#import <AVFoundation/AVAssetWriter.h>
#import <CoreVideo/CVPixelBuffer.h>
#import <CoreMedia/CMTime.h>

#import “AWScreenshot.h”

#define FRAME_WIDTH 320
#define FRAME_HEIGHT 480
#define TIME_SCALE 60 // frames per second

-(void) startScreenRecording
{  
    NSLog(@”start screen recording”);
   
    // create the AVAssetWriter
    NSString *moviePath = [[self pathToDocumentsDirectory] stringByAppendingPathComponent: @”video.mov”];
    if ([[NSFileManager defaultManager] fileExistsAtPath:moviePath])
    {   [[NSFileManager defaultManager] removeItemAtPath:moviePath error:nil];
    }
   
    NSURL *movieURL = [NSURL fileURLWithPath:moviePath];
    NSError *movieError = nil;
   
    [assetWriter release];
    assetWriter = [[AVAssetWriter alloc] initWithURL:movieURL
                                            fileType: AVFileTypeQuickTimeMovie
                                               error: &movieError];
    NSDictionary *assetWriterInputSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                              AVVideoCodecH264, AVVideoCodecKey,
                                              [NSNumber numberWithInt:FRAME_WIDTH], AVVideoWidthKey,
                                              [NSNumber numberWithInt:FRAME_HEIGHT], AVVideoHeightKey,
                                              nil];
    assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType: AVMediaTypeVideo
                                                          outputSettings:assetWriterInputSettings];
    assetWriterInput.expectsMediaDataInRealTime = YES;
    [assetWriter addInput:assetWriterInput];
   
    [assetWriterPixelBufferAdaptor release];
    assetWriterPixelBufferAdaptor =  [[AVAssetWriterInputPixelBufferAdaptor  alloc]
                                     initWithAssetWriterInput:assetWriterInput
                                     sourcePixelBufferAttributes:nil];
    [assetWriter startWriting];
   
    firstFrameWallClockTime = CFAbsoluteTimeGetCurrent();
    [assetWriter startSessionAtSourceTime: CMTimeMake(0, TIME_SCALE)];
   
    // start writing samples to it
    [assetWriterTimer release];
    assetWriterTimer = [NSTimer scheduledTimerWithTimeInterval:0.1
                                                        target:self
                                                      selector:@selector (writeSample:)
                                                      userInfo:nil
                                                       repeats:YES] ;
   
}

-(void) stopScreenRecording
{   [assetWriterTimer invalidate];
    assetWriterTimer = nil;
   
    [assetWriter finishWriting];
    NSLog (@”finished writing”);
}

As you can see startScreenRecording is calls writeSample.

-(void) writeSample: (NSTimer*) _timer
{   if (assetWriterInput.readyForMoreMediaData)
    {
        CVReturn cvErr = kCVReturnSuccess;
       
        // get screenshot image!
        CGImageRef image = (CGImageRef) [[self createARGBImageFromRGBAImage:[self screenshot]] CGImage];
       
        // prepare the pixel buffer
        CVPixelBufferRef pixelBuffer = NULL;
        CFDataRef imageData= CGDataProviderCopyData(CGImageGetDataProvider(image));
        cvErr = CVPixelBufferCreateWithBytes(kCFAllocatorDefault,
                                             FRAME_WIDTH,
                                             FRAME_HEIGHT,
                                             kCVPixelFormatType_32ARGB,
                                             (void*)CFDataGetBytePtr(imageData),
                                             CGImageGetBytesPerRow(image),
                                             NULL,
                                             NULL,
                                             NULL,
                                             &pixelBuffer);
       
        // calculate the time
        CFAbsoluteTime thisFrameWallClockTime = CFAbsoluteTimeGetCurrent();
        CFTimeInterval elapsedTime = thisFrameWallClockTime - firstFrameWallClockTime;
        //NSLog (@”elapsedTime: %f”, elapsedTime);
        CMTime presentationTime =  CMTimeMake (elapsedTime * TIME_SCALE, TIME_SCALE);
       
        // write the sample
        BOOL appended = [assetWriterPixelBufferAdaptor appendPixelBuffer:pixelBuffer withPresentationTime:presentationTime];
   
        if (appended)
        {   NSLog (@”appended sample at time %lf”, CMTimeGetSeconds(presentationTime));
        } else
        {   NSLog (@”failed to append”);
            [self stopScreenRecording];
        }
    }
}

And the code I used to take screenshot:

- (UIImage*)screenshot
{   return [AWScreenshot takeAsImage];
}

Notice how I called [[self createARGBImageFromRGBAImage: [self screenshot]], it’s because my UIImage is a RGBAImage, while the CVPixelBuffer’s format type is kCVPixelFormatType_32ARGB, so I had to fix thing so they match or else, my video would come up in weird tints.

I found the Googled for the createARGBImageFromRGBAImage code, and here it is:

-(UIImage *) createARGBImageFromRGBAImage: (UIImage*)image
{   CGSize dimensions = [image size];
   
    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * dimensions.width;
    NSUInteger bitsPerComponent = 8;
   
    unsigned char *rgba = malloc(bytesPerPixel * dimensions.width * dimensions.height);
    unsigned char *argb = malloc(bytesPerPixel * dimensions.width * dimensions.height);
   
    CGColorSpaceRef colorSpace = NULL;
    CGContextRef context = NULL;
   
    colorSpace = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(rgba, dimensions.width, dimensions.height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault); // kCGBitmapByteOrder32Big
    CGContextDrawImage(context, CGRectMake(0, 0, dimensions.width, dimensions.height), [image CGImage]);
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
   
    for (int x = 0; x < dimensions.width; x++) {
        for (int y = 0; y < dimensions.height; y++) {
            NSUInteger offset = ((dimensions.width * y) + x) * bytesPerPixel;
            argb[offset + 0] = rgba[offset + 3];
            argb[offset + 1] = rgba[offset + 0];
            argb[offset + 2] = rgba[offset + 1];
            argb[offset + 3] = rgba[offset + 2];
        }
    }
   
    colorSpace = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(argb, dimensions.width, dimensions.height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrderDefault); // kCGBitmapByteOrder32Big
    CGImageRef imageRef = CGBitmapContextCreateImage(context);
    image = [UIImage imageWithCGImage: imageRef];
    CGImageRelease(imageRef);
    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);
   
    free(rgba);
    free(argb);
   
    return image;
}

And there we go, I managed to record the screen of my Cocos2d app and then save it as a video file.

My next problem is, how do I add audio to my video?

So you want to add Facebook integration to your iOS Cocos2d game (allow players to upload screenshots, videos or post stuff to their wall, like how awesome your game is). First off, hop to the Facebook Developers website and check out the Mobile part, there should be a Getting Started page, this page:

Getting Started Mobile Apps

https://developers.facebook.com/docs/guides/mobile/

Follow the steps. Once you’re done with that, you pretty much already know how to post the the player’s Facebook wall.

Next question, how to upload a photo or a video. For videos, just check out a how-to blog post by Christine Abernathy. Link:

How-To: Use the Graph API to Upload a Video (iOS)

https://developers.facebook.com/blog/post/532/

Just follow that tutorial.

For photos, just replace the video code to:

UIImage *img = [UIImage imageWithContentsOfFile: @”img.jpg”];
   
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys: img, @”picture”, nil];
   
[delegate.facebook requestWithGraphPath:@”me/photos”
                                  andParams:params
                              andHttpMethod:@”POST”
                                andDelegate:self];

But, but, but the samples are not for a Cocos2d project.

For a Cocos2d project it’s more or less the same.

So your AppDelegate.h will look something like this:

#import <UIKit/UIKit.h>
#import “FBConnect.h”

@interface AppDelegate : NSObject <UIApplicationDelegate, FBSessionDelegate, FBRequestDelegate>
{    UIWindow *window;
   
    Facebook *facebook;
}

@property (nonatomic, retain) UIWindow *window;
@property (nonatomic, retain) Facebook *facebook;
@property (nonatomic, retain) NSString *appId;

@end

Just take note of the Facebook related stuff. I also added a NSString appId, which will store our app’s id.

Somewhere in AppDelegate.m applicationDidFinishLaunching (before you run your game scene):

facebook = [[Facebook alloc] initWithAppId: @”<APPID>”];
   
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@”FBAccessTokenKey”]
        && [defaults objectForKey:@”FBExpirationDateKey”])
{   facebook.accessToken = [defaults objectForKey:@”FBAccessTokenKey”];
        facebook.expirationDate = [defaults objectForKey:@”FBExpirationDateKey”];
}

And then as mentioned in the previous examples, add this to code as well:

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{   return [facebook handleOpenURL:url];
}

When I ran my app on my device I encountered this error:

sgx error: background gpu access not permitted

So I Googled and found this link:

http://dougdiego.com/2010/10/01/sgx-error-background-gpu-access-not-permitted/

And it said add these lines of codes to the AppDelegate code:

- (void)applicationDidEnterBackground:(UIApplication *)application
{   [[CCDirector sharedDirector] stopAnimation];
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{   [[CCDirector sharedDirector] startAnimation];
}

- (void)applicationWillResignActive:(UIApplication *)application
{   [[CCDirector sharedDirector] pause];
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{  [[CCDirector sharedDirector] resume];
}

Now in your game scene, or wherever in your game that needs some Facebook thingamajigie, like when the player clicks on an upload screenshot to Facebook button: (These codes are based on the upload video tutorial)

-(void) uploadToFacebookTapped: (id) sender

{  AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
    if (![delegate.facebook isSessionValid])
    {  
        NSArray* permissions =  [[NSArray arrayWithObjects:
                                  @”publish_stream”, @”user_photos”, nil] retain];
       
        [delegate.facebook authorize:permissions delegate: self];
    }   else
    {   [self uploadScreenshot];
    }

}

- (void)fbDidLogin
{   [self uploadScreenshot];
}

-(void)fbDidNotLogin:(BOOL)cancelled
{    NSLog(@”fbDidNotLogin”);
}

-(void) uploadScreenshot
{   AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
   
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent: @”screenshot.png”];
   
    UIImage *img = [UIImage imageWithContentsOfFile: path];
   
    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                   img, @”picture”,
                                   nil];
   
    [delegate.facebook requestWithGraphPath:@”me/photos”
                                  andParams:params
                              andHttpMethod:@”POST”
                                andDelegate:self];
}

So what happens is, if your player is not logged into Facebook and is using the Facebook function for your app for the first time (for that session), it will redirect the player to the Facebook app, or a web browser to allow the player to login and authorize your app. Once that is done, the fbLogin function will be called. And then uploadScreenshot.

And the call back code:

- (void)request:(FBRequest *)request didLoad:(id)result
{    if ([result isKindOfClass:[NSArray class]])
    {   result = [result objectAtIndex:0];
    }
   
    NSLog(@”Result of API call: %@”, result);
}

- (void)request:(FBRequest *)request didFailWithError:(NSError *)error
{   NSLog(@”Failed with error: %@”, [error localizedDescription]);
}

After the screenshot has been upload, request didLoad will be called, if there is some kind of error along the way, request didFailWithError will be called.

And that’s it :)

Tiny Wings is this adorable game by Andreas Illiger that involves this tiny bird who dream of flying.

It is extremely popular on the App store, and that is probably why lots of people wants to know how to make a game like it.

These are some links to tutorials and remake projects.

Sergey Tiknohov (@haqu) is working on a Tiny Wings remake project.

• https://github.com/haqu/tiny-wings

Ray Wenderlich wrote a tutorial based on Sergey’s project, which is divided into 2 parts. The tutorial uses Cocos2d and Box2d.

• http://www.raywenderlich.com/3857/how-to-create-dynamic-textures-with-ccrendertexture
• http://www.raywenderlich.com/3888/how-to-create-a-game-like-tiny-wings-part-1
• http://www.raywenderlich.com/3913/how-to-create-a-game-like-tiny-wings-part-2

@jpsarda wrote a blog post on how to make the gorgeous hills in Tiny Wings using Cocos2d.

• http://jpsarda.tumblr.com/post/6171831450/tiny-wings-hills-with-cocos2d

Emanuele Feronato wrote a tutorial on how to make the Tiny Wings terrain using Flash and Box2d.

• http://www.emanueleferonato.com/2011/07/14/create-a-terrain-like-the-one-in-tiny-wings-with-flash-and-box2d/