Fun with Sprites – Sky Defense - Cocos2d-x by Example Beginner's Guide - page 130

_bomb->stopAllActions();
_bomb->setScale(0.1f);
_bomb->setPosition(tap);
_bomb->setVisible(true);
_bomb->setOpacity(50);
_bomb->runAction(_growBomb->clone());
auto child = (Sprite *)
_bomb->getChildByTag(kSpriteHalo);
child->runAction(_rotateSprite->clone());
child = (Sprite *)
_bomb->getChildByTag(kSpriteSparkle);
child->runAction(_rotateSprite->clone());
}
}
4. If _bomb is visible, it means it's already growing on the screen. So on touch, we
use the stopAllActions() method on the bomb and we use the
stopAllActions() method on its children that we retrieve through our tags:
child = (Sprite *) _bomb->getChildByTag(kSpriteHalo);
child->stopAllActions();
child = (Sprite *)
_bomb->getChildByTag(kSpriteSparkle);
child->stopAllActions();
5. If _bomb is the right size, we start our _shockwave . If it isn't, we play a bomb
failure sound effect; there is no explosion and _shockwave is not made visible.
6. If we have an explosion, then the _shockwave sprite is set to 10 percent of the
scale. It's placed at the same spot as the bomb, and we run a couple of actions on
it: we grow the _shockwave sprite to twice the scale the bomb was when it
went off and we run a copy of _shockwaveSequence that we created earlier.
7. Finally, if no _bomb is currently visible on screen, we create one. And we run
clones of previously created actions on the _bomb sprite and its children. When
_bomb grows, its children grow. But when the children rotate, the bomb does
not: a parent changes its children, but the children do not change their parent.