射击小游戏一03（碰撞检测）

/* 申明数组的时候一定要注意retain:比如  



_targets =  CCArray::create();



 _targets->retain();



*/



 



voidHelloWorld::update(CCTime dt)



{



    CCArray *projectilesToDelete = CCArray::create();



    projectilesToDelete->retain();



    



    for (int i = 0; i < _projectiles->count(); i++)



    {



        CCSprite *projectile = (CCSprite*)(_projectiles->objectAtIndex(i));



        CCRect projectileRect = CCRectMake(



                                           projectile->getPosition().x



                                           - (projectile->getContentSize().width/2),



                                           projectile->getPosition().y



                                           - (projectile->getContentSize().height/2),



                                           projectile->getContentSize().width,



                                           projectile->getContentSize().height);



        



        CCArray *targetsToDelete = CCArray::create();



        targetsToDelete->retain();



        for (int j = 0; j < _targets->count(); j++)



        {



            CCSprite *target = (CCSprite *)(_targets->objectAtIndex(j));



            CCRect targetRect = CCRectMake(



                                           target->getPosition().x - (target->getContentSize().width/2),



                                           target->getPosition().y - (target->getContentSize().height/2),



                                           target->getContentSize().width,



                                           target->getContentSize().height);



            



          //  if (CCRect::CCRectIntersectsRect(projectileRect, targetRect))



            if (projectileRect.intersectsRect(targetRect))



            {



                targetsToDelete->addObject(target);



            }



        }



        for (int k = 0; k < targetsToDelete->count(); k++)



        {



            CCSprite *target = (CCSprite *)(targetsToDelete->objectAtIndex(k));



            _targets->removeObject(target);



            this->removeChild(target, true);



        }



        



        if (targetsToDelete->count() >0)



        {



            projectilesToDelete->addObject(projectile);



        }



        targetsToDelete->release();



    }



    for (int l = 0; l < projectilesToDelete->count(); l++)



    {



        CCSprite* projectile =  (CCSprite *)(projectilesToDelete->objectAtIndex(l));



        _projectiles->removeObject(projectile);



        this->removeChild(projectile, true);



    }



    projectilesToDelete->release();



}