title: iOS CAEmitterCell firework effect
body: <p>I'm wanna create an effect like firework. I know that I can use for it CAEmitterCell. I tried to download few examples, but I still in progress with this feature in iOS 5.0</p>
  
  <p>Anybody know good tutorial how to create firework effect using CAEmitterCell?</p>
  
  <p>I need to create something like below:</p>
  
  <p><img src="https://i.stack.imgur.com/D7qOa.png" alt="enter image description here"></p>
  
  <p>All particles are going from the center (red circle) in direction to green circles. Red circle this is initial point that will have some CGPoint value.</p>