Hello cocos2d-x guys,
I’m a beginner from WeiFang China and am now learning a tutorial with a Chinese version at http://mssyy2010.blog.51cto.com/4595971/847000 (the corresponding English version being at http://www.raywenderlich.com/4787/how-to-make-a-catapult-shooting-game-with-cocos2d-and-box2d-part-2). I found an ‘Assertion failed’ when I run the Particle system related part of code in the demo. Long to see your help. The details is:
I’m now using the version 2.0.2 of cocos2d-x. Obviously, the demo shown above in C++ is based upon an old release of cocos2d-x, so I updated it in most parts with the newly-recommended stuff in 2.0.2. However, I still come up with the above ‘assertion’ error thrown out. Here is the related code:
`void HelloWorld::tick( float dt )
{
//It is recommended that a fixed time step is used with Box2D for stability
//of the simulation, however, we are using a variable time step here.
//You need to make an informed choice, the following URL is useful
//http://gafferongames.com/game-physics/fix-your-timestep/
int velocityIterations = 8;
int positionIterations = 1;
// Instruct the world to perform a single step of simulation. It is
// generally best to keep the time step and iterations fixed.
m_world->Step(dt, velocityIterations, positionIterations);
//Iterate over the bodies in the physics world
for (b2Body* b = m_world->GetBodyList(); b; b = b->GetNext())
{
if (b->GetUserData() != NULL) {
//Synchronize the AtlasSprites position and rotation with the corresponding body
CCSprite* myActor = (CCSprite*)b->GetUserData();
myActor->setPosition( CCPointMake( b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO) );
myActor->setRotation( -1 * CC_RADIANS_TO_DEGREES(b->GetAngle()) );
}
}
// Arm is being released.
if (m_bReleasingArm && m_bulletJoint)
{
// Check if the arm reached the end so we can return the limits
if (m_armJoint->GetJointAngle() <= CC_DEGREES_TO_RADIANS(10))
{
m_bReleasingArm = false;
// Destroy joint so the bullet will be free
m_world->DestroyJoint(m_bulletJoint);
m_bulletJoint = NULL;
runAction(CCSequence::actions(CCDelayTime::actionWithDuration(5.0f),
CCCallFunc::actionWithTarget(this, callfunc_selector(HelloWorld::resetBullet)),NULL));
}
}
// Bullet is moving.
if (m_bulletBody && m_bulletJoint == NULL)
{
b2Vec2 position = m_bulletBody->GetPosition();
CCPoint myPosition = getPosition();
CCSize screenSize = CCDirector::sharedDirector()->getWinSize();
// Move the camera.
if (position.x > screenSize.width / 2.0f / PTM_RATIO)
{
myPosition.x = -MIN(screenSize.width * 2.0f - screenSize.width, position.x * PTM_RATIO - screenSize.width / 2.0f);
//getPosition().x = myPosition.x;
setPosition(myPosition);
getChildByTag(kTagTileMap)->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20-myPosition.x, 20));
}
}
// Check for impacts
std::set<b2Body*>::iterator pos;
for(pos = m_contactListener->contacts.begin();
pos != m_contactListener->contacts.end(); ++pos)
{
b2Body *body = *pos;
CCNode *contactNode = (CCNode*)body->GetUserData();
CCPoint position = contactNode->getPosition();
removeChild(contactNode, true);
m_world->DestroyBody(body);
std::vector<b2Body*>::iterator iter;
for(iter = m_vectorTargets->begin() ; iter != m_vectorTargets->end() ; ++iter)
{
if(*iter == body)
{
m_vectorTargets->erase(iter);
break;
}
}
std::vector<b2Body*>::iterator it;
for(it = m_vectorEnemies->begin() ; it!=m_vectorEnemies->end() ; ++it)
{
if(*it == body)
{
m_vectorEnemies->erase(it);
break;
}
}
// [targets removeObject:[NSValue valueWithPointer:body]];
// [enemies removeObject:[NSValue valueWithPointer:body]];
CCParticleSun* explosion = CCParticleSun::create();
-
explosion->initWithTotalParticles(100); -
explosion->setTexture(CCTextureCache::sharedTextureCache()->addImage("fire.png")); explosion->setAutoRemoveOnFinish(true); explosion->setStartSize(10.0f); explosion->setSpeed(70.0f); explosion->setAnchorPoint(ccp(0.5f,0.5f)); explosion->setPosition(position); explosion->setDuration(1.0f); explosion->retain(); addChild(explosion, 11); explosion->release();}
// remove everything from the set
m_contactListener->contacts.clear();
}
`
Now, every time when the above code executed to this line:
explosion->initWithTotalParticles(100);
the following exception would be thrown out:
Assertion failed!
Program:…
File:e:……2d….cpp
Line: 447
Expression: pHashElement~~>entry~~>markedForDeletion
For infomation on how your program can cause an assertion failure,……
So, when I pressed “Retry” to track the debug or even re-debug the code, I found preceding error thrown when the above initWithTotalParticles method was invoked. And further, I pressed F11 to track into the method I come to ‘bool CCParticleSystem::initWithTotalParticles(unsigned int numberOfParticles)’. In this method, when ‘this->scheduleUpdateWithPriority(1);’ was executed, the above exception would be triggered!
I googled many times with several keywords but found nearly nothing that can help (I even changed the number of particle to a very small number the same story still took place), so I come here for help. Thanks in advance!
Best regards,