RANDOM OBJECT!

cocos2d-x C++
#1

Hi Again!
i would add random object from a ccArray to the scene and the array holds 6 Gems(sprite children) but the second time i run the function it says: this child has already been added. So my overall question is: HOW CAN I GET INFINITY NUMBER OF RANDOM CHILDREN FROM THAT ARRAY TO MY SCENE!
here’s all the info:
-Code:

void Game::onEnterTransitionDidFinish()
{
    CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("GEMS.plist");
    this->setTouchEnabled(true);
    this->initializeGame();
}

void Game::initializeGame()
{
    gems = CCArray::create();
    gems->retain();
    gemsOnScreen = CCArray::create();
    gemsOnScreen->retain();
    
    for (int i = 1; i <= 6; i++) {
        CCString *filename = CCString::createWithFormat("gemstone%d.png", i);
        Gem* gem = (Gem*)Gem::createWithSpriteFrameName(filename->getCString());
        gems->addObject(gem);
    }
}

void Game::ccTouchesBegan(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
    CCTouch* touch = (CCTouch*)pTouches->anyObject();
    CCPoint location = touch->getLocationInView();
    location = CCDirector::sharedDirector()->convertToGL(location);
    
    showMole();
}
void Game::showMole()
{
    Gem* gem = (Gem*)gems->randomObject();
    
    
    gem->setPosition(ccp(150*timesX, 400));
    this->addChild(gem);
    gemsOnScreen->addObject(gem);
    timesX++;
}

void Game::onExit()
{
    gems->release();
    gemsOnScreen->release();
    CCLayer::onExit();
}

BUT SECOND TIME I TOUCH AND IT RUNS SHOWMOLE() IT SAYS “THIS CHILD HAS ALREADY BEEN ADDED”.
PLZPZLZPLZPLZPZLPZL HELP ME!:slight_smile: :frowning:
IMAGE OF THE ERROR:


MyError.jpg (430.7 KB)

#2

I do this and dont have a problem, but I do it differently.

just as an example, what about something like:

CCSprite *spriteArr[ 100 ];

for ( unsigned int i = 0; i < 100; i++ ) {

    spriteArr[ i ] = new cocos2d::CCSprite();
    spriteArr[ i ]->initWithFile( "sprite.png" );
    spriteArr[ i ]->setPosition( cocos2d::CCPoint( i * 10, 100 ) );

    this->addChild( spriteArr[ i ] );

}

for randomness, maybe use something like:

      std::random_device rseed;
      std::mt19937 rgen(rseed()); // mersenne_twister
      std::uniform_int_distribution<int> idist(1, spriteArr.size()); // [0,100]
      int _random = idist(rgen);

This is just psuedo code, I assumed you were on Cocos2d-x v2

#3

OMG TYYYY~!
But i wanted to add more children from one object in an array expempel:
Gem* gem = (Gem*)array->randomObject;
this->addChild(gem);
And then run that function more than once!
BUT how can i do that without getting “this child has already been added”…
I REALLY APPRECIATE YOUR ANSWER BUT CAN U OR SOMEONE ELSE TELL ME THE ANSWER FOR THIS QUESTION:)

#4

Look at my For loop carefully. It is doing what you want. Adding multiple’s and you wont get the error.

#5

Many thanks again it worked!
But SOMEONE PLZPLZPLzPLZ tell me why this happens:

I schedule this tick function where i should get a random object.
But it is always in the same order, why and how can i actually make it random…
See the image in the bottom to see the order…:slight_smile:

void Game::tick(float dt)
{
timeElapsed += dt;
increaseElapsed += dt;
totalTime += dt;
if (timeElapsed >= TimeBetweenGems ) {
this->showMole();
timeElapsed = 0;
}
}

And the showmole() definition

void Game::showMole()
{
CCString string = (CCString)Utils::getGems()->randomObject();
Gem* gem = Gem::create();
gem->setDisplayFrame(CCSpriteFrameCache::sharedSpriteFrameCache()->spriteFrameByName(string->getCString()));
gem->setPosition(ccp(100*timesX, 400));
this->addChild(gem);
gemsOnScreen->addObject(gem);
timesX++;
}

Just ask for more info if its needed.
PLZ PLZ PLZ ZPLZ HELP ME AGAIN xD:)

#6

I already helped you! Please try my code and see that it works,

You get your error because you dont have your objects in a container so you really are creating multiple gem objects and adding it. It works the first time but 2nd time it knows you already have added one.

#7

OMG LOVE U!
I understand, but can u please give me an example:)
U r my god!

#8

PLZZZZ xD:)

#9

I already gave you the exact answer, just substitute in your Gem object.