Time for action – creating particle systems

For particles, all we need is the XML file describing the particle system's properties.

1. So let's go to GameLayer.cpp.

2. The game initializes by calling createGameScreen, which is already in place, then createParticles and createStarGrid, which is also implemented. So let's go over the createParticles method now.

3. Go to that method in GameLayer.cpp and add the following code:

   _jet = ParticleSystemQuad::create("jet.plist");
   _jet->setSourcePosition(Vec2(-_rocket->getRadius() * 0.8f,0));
   _jet->setAngle(180);
   _jet->stopSystem();
   this->addChild(_jet, kBackground);
   
   _boom = ParticleSystemQuad::create("boom.plist");
   _boom->stopSystem();
   this->addChild(_boom, kForeground);
   
   _comet = ParticleSystemQuad::create("comet.plist");
   _comet->stopSystem();
   _comet->setPosition(Vec2(0, _screenSize.height * 0.6f));
   _comet->setVisible(false);
   this->addChild(_comet, kForeground);
   
   _pickup = ParticleSystemQuad::create("plink.plist");
   _pickup-...