Hi, Sometimes you may need to get a sprite using tag while doing a project using Cocos2D. It’s easy to get a sprite by a tag in Cocos2D, use the following code to get it. Here ‘tempSprite’ is your CCSprite and it will get the sprite with tag 7. 🙂
Hi, In order to make a sprite completely invisible , use the following code while using Cocos2D, this code will set the visibility of your sprite to zero. In order to make a sprite completely visible, use the following code while using Cocos2D, this code will set the visibility of the sprite back to one.… Read More »
Hi, In order to mute and unmute sound in Cocos2D iPhone, use the following code. 🙂
Hi, In order to set font and size of a UITextView programmatically use the following code. 🙂
Hi, Use the following line of code to convert NSData to NSString in iPhone/iPad using Objective C. Here ‘yourData’ is your NSData which you want to convert to NSString. 🙂
Hi, How can you detect single/double/triple taps in iPhone using Objective C? Use the following code to detect single or multiple taps in iPhone/iPad/iPod. The code can also be used with Cocos2D & Box2D. Try it out! You can even detect Quadrup! 🙂
Hi, How can you identify the sprite associated with a particular body while using box2D ? Sometimes you may need to identify the sprite associated with the body you are using. For that use the following line of code. Now you got the corresponding sprite in your ‘yourSprite’ 🙂
Hi, Sometimes you may need to find the distance between two CGPoint in cocos2D or box2D using Objective C. See the following code to see how you could do that. 🙂
Hi, Sometimes you may want to detect shake gesture in iPhone using your programs. But how can you detect shake gesture in iPhone? Shake gesture in iPhone can be detected by using the accelerometer. The following lines of code can be used for detecting the shake gesture in iPhone. You can use these lines of… Read More »
Hi, If you are a game developer and you are using box2D for real world simulations, you would probably need a particular body to be removed from the box2D world! But how can you remove box2D body from world ? See the following sample code which does the same. – (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {… Read More »
Hi, Sometimes you may need to find/search a particular item in NSArray. How can you find whether a particular item is present in NSArray or not? Look at the code below. Here ‘yourArray is your NSArray and ‘containsObject’ returns either TRUE or FALSE and it get stored in ‘testFlag’. 🙂
Hi, Sometimes you may need to empty an NSMutableArray which is already initialized with some objects. You don’t need to release it and again alloc it for future use! You can simply empty an NSMutableArray using the following line of code. [yourArray removeAllObjects]; Here ‘yourArray’ is your NSMutableArray. 🙂
Hi, While using Box2D , in many cases you may need to connect two bodies together. But the collision between them during motion is not what you preferred! So how can you prevent those bodies being connected in Box2D from collision? Use the line of code to prevent the collision. jointDef.collideConnected = false;
Yet another animation api from cocos2D, check it out…… id move = [CCMoveTo actionWithDuration:1 position:ccp(200,250); CCEaseElasticIn *elasticIn = [CCEaseElasticIn actionWithAction:move period:2.0]; [my_sprite runAction:elasticIn ];
There are different ways for playing sound on the Mac in Objective C. Let’s look at some of the methods.. 1. Play by filename. NSSound *mySound = [NSSound soundNamed:@”sound”]; if you have no file named “sound” in your application’s main bundle, then it will return nil. 2. Play by pathName sound = [[NSSound alloc] initWithContentsOfFile:@”/Volumes/Audio/sound.aiff”… Read More »
This code snippet deletes a substring from a original string.. /** initialize two strings **/ NSString *string = @”This is heaven”; NSString *part = @”heaven”; /** Get the range of the substring in the original string **/ NSRange range = [string rangeOfString:part]; /** Delete the substring from the original string **/ [string deleteCharactersInRange:range]; Please leave… Read More »
This simple code plays a music…….. [[SimpleAudioEngine sharedEngine] playBackgroundMusic:@”my_music.mp3″]; For stopping the music use this……. [[SimpleAudioEngine sharedEngine]stopBackgroundMusic]; To pause the music use this line of code….. [[SimpleAudioEngine sharedEngine] pauseBackgroundMusic];
Gear joints are one of the real specialities of Box2D. By creating gear joints between two bodies you can actually simulate a real world gear. For creating a gear joint you need two bodies connected by a revolute or prismatic joint. The below code creates two bodies in the shape of a circle which is… Read More »
Hi all …… You know iPhone doesnot have garbage collection like ANDROID. So it becomes the responsibility of the developer or programmer to release the resources and remove the unwanted textures from your memory. If you don’t remove the unused textures and other variables from your memory your application will exit after a while. You… Read More »
For an interactive game building using Box2D, collision detection of Box2D bodies is necessary. There is an easy way to implement collision detection in Box2D. For checking whether two bodies have collided with each other in Box2D while using it with cocos2D, then use the following lines of code where ever you want to check… Read More »
Hi, In certain situations you may need to remove all the forces you have applied on different bodies in your box2D world. Then what to do? Removing all the forces from the bodies in the box2D world is simple. Just use the single line of code. yourWorld->ClearForces(); Here yourWorld is your Box2D world. Simple, isn’t… Read More »
In Cocos2D in iPhone often you may be using spritesheets which amy cause memory leaks because they are unused textures in memory even when you go from one scene to other. So make sure to remove all those unwanted textures from memory to save memory. Copy this following code to dealloc function in your class… Read More »
To check whether your body is in rest or not you need to check whether the body->IsAwake() function returns true.IF yes then your body is at rest. Take a look at the following snippet.
Follow these steps…. Select your particle system from the Particle Designer . The go to file-> save as “file.plist” Copy file.plist to your resources folder. Copy the following code to your Xcode.
Everyone will be fascinated how flash games are built on the web that implements the real world physics. Well for your information there are a lot of physics engines available. One of them is the Box2D. Box2D was written in C++. Then it was converted to flash. So now I am going to show you… Read More »