physics4

import SpriteKit
import GameplayKit


extension SKPhysicsBody {
func ideal() -> SKPhysicsBody {
  //摩擦係数の値で 1 に近いほど摩擦が多くなります0.0から1.0の間
  self.friction = 0
  self.linearDamping = 0  //粘性//体にかかる流体または空気の摩擦力
  self.angularDamping = 0  //体の回転速度を遅くする特性 0.0から1.0の間の値
  self.restitution = 0.98  //反発率
  self.isDynamic = true  //動かせる性質
  self.allowsRotation = false //角力とインパルスの影響デフォルト値はtrue
  // 重力を無視する　重力の影響を受けない
  //circleA.physicsBody?.affectedByGravity = false
  self.affectedByGravity = true
  return self
}
}

enum CollisionTypes: UInt32 {
    case player = 1
    case squareA = 2
    case squareB = 4
    case bottom = 8
}

class GameScene: SKScene, SKPhysicsContactDelegate {
  var n = 0
  let label = SKLabelNode(text: "kaisu: 0kai")
  var audio = SKAudioNode()
  var player = SKShapeNode()
  var squareA = SKShapeNode()

override func didMove(to view: SKView) {
  backgroundColor = .blue
  self.physicsWorld.contactDelegate = self
  physicsBody = SKPhysicsBody(edgeLoopFrom: frame)
    physicsWorld.gravity = CGVector(dx: 0, dy: -1.5)

  let labelSize: CGFloat = 30.0
  label.fontSize = labelSize
    label.position = CGPoint(x:self.frame.midX, y:self.frame.height/1.12)
  label.fontColor = SKColor.white
  self.addChild(label)

  player = SKShapeNode(circleOfRadius: 30)
    player.position = CGPoint(x:self.frame.midX, y:self.frame.midY + 140)
    player.fillColor = UIColor.red
    player.lineWidth = 4.0
    player.strokeColor = UIColor.lightGray
  self.addChild(player)
    player.name = "player"
    player.physicsBody = SKPhysicsBody(circleOfRadius: player.frame.width/2).ideal()

  squareA = SKShapeNode(rectOf: CGSize(width:50, height:50),cornerRadius: 3)
  squareA.position = CGPoint(x:self.frame.midX, y:self.frame.midY + 10)
  squareA.fillColor = UIColor.yellow
  squareA.lineWidth = 2.0
  squareA.strokeColor = UIColor.lightGray
  self.addChild(squareA)
  squareA.name = "squareA"
  squareA.physicsBody = SKPhysicsBody(rectangleOf: squareA.frame.size).ideal()
  squareA.physicsBody?.affectedByGravity = false

  let squareB = SKShapeNode(rectOf: CGSize(width:100, height:100),cornerRadius: 5)
  squareB.position = CGPoint(x:self.frame.midX, y:self.frame.midY - 200)
  squareB.fillColor = .green
  squareB.lineWidth = 0.0
  self.addChild(squareB)
    squareB.name = "squareB"
  squareB.physicsBody = SKPhysicsBody(rectangleOf: squareB.frame.size).ideal()

  let bottomRect = CGRect(x: self.frame.origin.x, y: self.frame.origin.y, width: self.frame.size.width, height: 1)
  let bottom = SKNode()
  bottom.physicsBody = SKPhysicsBody(edgeLoopFrom: bottomRect)
  self.addChild(bottom)
    bottom.name = "bottom"
 player.physicsBody?.categoryBitMask = CollisionTypes.player.rawValue
  squareA.physicsBody?.categoryBitMask = CollisionTypes.squareA.rawValue
  squareB.physicsBody?.categoryBitMask = CollisionTypes.squareB.rawValue
  //bottomカテゴリ
  bottom.physicsBody?.categoryBitMask = CollisionTypes.bottom.rawValue
 player.physicsBody?.contactTestBitMask = CollisionTypes.squareA.rawValue | CollisionTypes.squareB.rawValue | CollisionTypes.bottom.rawValue
}
    func testAudio() {
      audio = SKAudioNode(fileNamed: "Sounds/sound.wav")
      audio.autoplayLooped = false
      addChild(audio)
      let playAction = SKAction.play()
      let wait = SKAction.wait(forDuration: 0.2)
      let grp = SKAction.group([playAction, wait])
      let rfp = SKAction.removeFromParent()
      let sequence = SKAction.sequence([grp, rfp])
      audio.run(sequence)
       }

   func testParticle() {
      let explosion = SKEmitterNode(fileNamed: "MyParticle.sks")!
      explosion.position = CGPoint(x: squareA.position.x, y: squareA.position.y + squareA.frame.size.height * 0.5)
   //    explosion.position = squareA.position
    //   beam.position = CGPoint(x: player.position.x, y: player.position.y + player.size.height * 0.5)
      explosion.name = "explosion1"
      explosion.xScale = 0.6
      explosion.yScale = 0.6
      explosion.zPosition = 10
      let action1 = SKAction.fadeOut(withDuration: 0.2)
      let action2 = SKAction.removeFromParent()
      let actionAll = SKAction.sequence([action1, action2])
      self.addChild(explosion)
        //アクションを実行する。
      explosion.run(actionAll)
    }

   //衝突判定処理
 func didBegin(_ contact: SKPhysicsContact) {
     n += 1
     label.text = "kaisu: \(n)kai"
guard let nodeA = contact.bodyA.node else { return }
 guard let nodeB = contact.bodyB.node else { return }
      if nodeA == player {
      playerCollided(with: contact.bodyB.node!)
    } else if nodeB == player {
     playerCollided(with: contact.bodyA.node!)
   }
 }
func playerCollided(with node: SKNode) {
     if node.name == "squareA" {
         testAudio()
        testParticle()
         node.removeFromParent()
     } else if node.name == "squareB" {
           node.removeFromParent()
        //       score += 1
    } else if node.name == "bottom" {
        player.removeFromParent()
         testAudio()
       }
    }

 override func touchesBegan(_ touches: Set, with event: UIEvent?) {
}
}