radamanthus / cocos2d-patterns

A repository of Cocos2d solutions to common problems

Cocos2D/Kobold2D Patterns

A repository of solutions to common Cocos2D/Kobold2D problems.

Drawing

Sprites

int x = 100;
int y = 100;
CCSprite *aSprite = [CCSprite spriteWithFile:@"sprite.png"];
aSprite.position = CGPointMake(x, y);
[self addChild:aSprite];

Text Labels

aLabel = [CCLabelTTF labelWithString:@"Hello, World!!"
                                           fontName:@"Marker Felt"
                                           fontSize:24];
aLabel = CGPointMake(400, 40);
aLabel = ccGREEN;
[self addChild:aLabel];

Buttons

First, create a CCSprite (see Drawing Sprites above). Then create or modify the ccTouchesBegan method:

- (void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
	UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:[touch view]];
	location = [[CCDirector sharedDirector] convertToGL:location];
    if (CGRectContainsPoint([aSprite boundingBox], location)) {
        CCLOG(@"The object aSprite was tapped!");
    }
}

Configuration

Initializing properties from a config.lua file

Create a config.lua file with this section:

MyConfig = 
{
    NumberOfPigs = 50,
    NumberOfCows = 20,
    NumberOfChickens = 30,
}

Then run this:

[KKConfig injectPropertiesFromKeyPath:@"MyConfig" target:self];

The above KKConfig call will be like running the following code:

self.numberOfPigs = 50;
self.numberOfCows = 20;
self.numberOfChickens = 30;

Scenes

To switch from OriginLayer to TargetLayer:

1. Add this class method to TargetLayer.

    +(CCScene *) scene
    {
    	CCScene *scene = [CCScene node];
    	TargetLayer* layer = [TargetLayer node];
    	[scene addChild: layer];
    
    	// return the scene
    	return scene;
    }
   

2. From OriginLayer:

    CCScene* trans = [CCTransitionFlipY transitionWithDuration:0.2 scene: [TargetLayer scene]];
    [[CCDirector sharedDirector] replaceScene: trans ];
   

You can replace CCTransitionFlipY with any of the transitions defined in CCTransition.h

Audio

TODO

Misc

Generate a Random number

This generates a random number between 1 and 100 (inclusive).

(arc4random() % 100) + 1;