How to have Billiards like physics in SpriteKit?

问题

I'm new to SpriteKit and am trying to make a Billiards game but it just doesn't seem to be working properly. The balls don't bounce off each other or the pool cue. I'm not sure what I'm doing wrong. Here is some sample code of one of the balls and the pool cue. Any help will be appreciated!

class PoolTableScene: SKScene, SKPhysicsContactDelegate {

  struct PhysicsCatagory {
    static let None : UInt32 = 0 //0
    static let PokeBall : UInt32 = 0b1 //1
    static let PoolCue : UInt32 = 0b1000 //5
    static let All : UInt32 = UInt32.max
  }

  let ballPoke = SKSpriteNode(imageNamed:"pokeBall")
  let cuePool = SKSpriteNode(imageNamed: "poolCue")

override func didMove(to view: SKView) {

    physicsWorld.contactDelegate = self
    self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
    let sceneBody = SKPhysicsBody(edgeLoopFrom: self.frame)
    sceneBody.friction = 0
    self.physicsBody = sceneBody 


    ballPoke.name = "ballPoke"
    ballPoke.size = CGSize(width: 50, height: 50)
    ballPoke.anchorPoint = CGPoint(x:0.5, y:0.5)
    ballPoke.position = CGPoint(x: self.frame.size.width*0.25, y:self.frame.size.height/2)
    ballPoke.zPosition = 100
    ballPoke.physicsBody = SKPhysicsBody(circleOfRadius: 25)
    ballPoke.physicsBody?.affectedByGravity = true 
    ballPoke.physicsBody?.restitution = 10 
    ballPoke.physicsBody?.linearDamping = 0 
    self.addChild(ballPoke)

  cuePool.name = "poolCue"
    cuePool.size = CGSize(width: 100, height: 500)
    cuePool.anchorPoint = CGPoint(x: 0.5, y: 0.5)
    cuePool.position = CGPoint(x: self.frame.size.width*0.20, y: self.frame.size.height/4)
    cuePool.zPosition = 100
    cuePool.physicsBody = SKPhysicsBody(circleOfRadius: 50)
    cuePool.physicsBody?.affectedByGravity = true
    cuePool.physicsBody?.restitution = 10
    cuePool.physicsBody?.linearDamping = 0

    self.addChild(cuePool)

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    for touch: AnyObject in touches {
      let positionOfTouch = touch.location(in: self)

      ballPoke.physicsBody?.categoryBitMask = PhysicsCatagory.PokeBall
      ballPoke.physicsBody?.collisionBitMask = PhysicsCatagory.BlueBall | PhysicsCatagory.OrangeBall | PhysicsCatagory.Border | PhysicsCatagory.PoolCue

 cuePool.physicsBody?.categoryBitMask = PhysicsCatagory.PoolCue
      cuePool.physicsBody?.collisionBitMask = PhysicsCatagory.BlueBall | PhysicsCatagory.OrangeBall | PhysicsCatagory.PokeBall

    }
}

来源：https://stackoverflow.com/questions/39581764/how-to-have-billiards-like-physics-in-spritekit

标签

ios

swift

sprite-kit

skspritenode