Pinch gesture in cocos2d, how to? - object

Question

I need to implement a simple pinch gesture in my cocos2d project with two or more sprites. Would you be so kind to tell me, how can I handle pitch gesture?
I need something like this:
-(void)handlePinchGesture:(UIPinchGestureRecognizer *)recognizer
{
if (recognizer.state != UIGestureRecognizerStateCancelled)
{
if (recognizer.numberOfTouches == 3)
{
CGPoint firstPoint = [recognizer locationOfTouch:0 inView:recognizer.view];
CGPoint secondPoint = [recognizer locationOfTouch:1 inView:recognizer.view];
CGPoint thirdPoint = [recognizer locationOfTouch:2 inView:recognizer.view];
CGPoint fourthPoint = [recognizer locationOfTouch:3 inView:recognizer.view];
ball1.position=firstPoint;
ball2.position=secondPoint;
ball3.position=thirdPoint;
ball4.position=fourthPoint;
}
}
}

Answer 1

Here what I did (it took me quite a lot of googling)
In implementation file
-(id)init
{
self = [super init];
self.isTouchEnabled=YES;
if (self != nil)
{
}
return self;
}
//pinch recognising
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSSet *allUserTouches=[event allTouches];
if(allUserTouches.count==2)
{
UITouch* touch1=[[allUserTouches allObjects] objectAtIndex:0];
UITouch* touch2=[[allUserTouches allObjects] objectAtIndex:1];
CGPoint touch1location=[touch1 locationInView:[touch1 view]];
CGPoint touch2location=[touch2 locationInView:[touch2 view]];
touch1location=[[CCDirector sharedDirector] convertToGL:touch1location];
touch2location=[[CCDirector sharedDirector] convertToGL:touch2location];
ball.position=touch1location;
newBall.position=touch2location;
float currentdist=ccpDistance(touch1location, touch2location);
oldDist=currentdist;
}
}
-(void)ccTouchesMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
NSSet *allUserTouches=[event allTouches];
if(allUserTouches.count==2)
{
UITouch* touch1=[[allUserTouches allObjects] objectAtIndex:0];
UITouch* touch2=[[allUserTouches allObjects] objectAtIndex:1];
CGPoint touch1location=[touch1 locationInView:[touch1 view]];
CGPoint touch2location=[touch2 locationInView:[touch2 view]];
touch1location=[[CCDirector sharedDirector] convertToGL:touch1location];
touch2location=[[CCDirector sharedDirector] convertToGL:touch2location];
float currentdist=ccpDistance(touch1location, touch2location);
if (oldDist>=currentdist)
{
//[spriteToZoom setScale:spriteToZoom.scale-fabs((oldDist-currentdist)/100)];
[ball setPosition:touch1location];
[newBall setPosition:touch2location];
NSLog(#"pinch out");
}
else
{
//[spriteToZoom setScale:spriteToZoom.scale+fabs((oldDist-currentdist)/100)];
[ball setPosition:touch1location];
[newBall setPosition:touch2location];
NSLog(#"pinch in");
}
}
}