Question

Firstly, let me explain that I have googled this, and I can’t seem to find a clear answer to this; but I believe this is because I am using incorrect terminology.

I am moving a ball to a location in a cocos2d/chipmunk ipad app like this:

// Determine speed of the target
        int minDuration = 2.0;
        int maxDuration = 4.0;
        int rangeDuration = maxDuration - minDuration;
        int actualDuration = (arc4random() % rangeDuration) + minDuration;

        NSLog([NSString stringWithFormat:@"%d",actualDuration]);

        // Create the actions
        id actionMove = [CCMoveTo actionWithDuration:0.2 
                                            position:ccp(location.x, location.y)];
        id actionMoveDone = [CCCallFuncN actionWithTarget:self 
                                                 selector:@selector(spriteMoveFinished:)];
        [ball runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];

        [ball retain]; 

I want to put this piece of code into a function (perhaps called a “method” in Obj-C, right?) and pass in the name of the sprite (in this case it’s “ball”), the x coordinate (location.x) and the y coordinate (location.y). The ball is a CCSprite and the location’s are integers.

I am a beginner at this so if you provide a solution please let me know how to clean up after it (like memory deallocation).

Thank you so much!

Answer 1

Here you have a snippet that could be ok for you:

• (void)moveBall:(CCNode*)ball toLocation:(CGPoint)location {

// Determine speed of the target
int minDuration = 2.0;
int maxDuration = 4.0;
int rangeDuration = maxDuration – minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;

    NSLog([NSString stringWithFormat:@"%d",actualDuration]);

    // Create the actions
    id actionMove = [CCMoveTo actionWithDuration:0.2 
                                        position:ccp(location.x, location.y)];
    id actionMoveDone = [CCCallFuncN actionWithTarget:self 
                                             selector:@selector(spriteMoveFinished:)];
    [ball runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];

    //        [ball retain];  //-- this makes no sense here

 }

You don’t need to retain ball in this function. Anyway, since you do not specify how ball is created, I assume that it is already correctly retained where you create it. If you give more details about it, I can help further.