BreakOutGameVansVTutorial

private var dt:TimeInterval = 0 /// 每一frame的时间差
private var lastUpdateTimeInterval:TimeInterval = 0
override func didMove(to view: SKView) {
 self.physicsWorld.gravity = CGVector.zero
 self.physicsBody?.linearDamping = 0.0
 self.physicsBody?.angularDamping = 0.0
 self.physicsWorld.contactDelegate = self
 
 initCheckDevice()
 setupBall() /// 球
 setupSkateboard() /// 滑板
 setupShose() /// 鞋子
 setupBgMusic() // 加入背景音乐;
 
}
// option+command+->展开
// MARK: - 检测是哪种设备
func initCheckDevice(){
 if UIDevice.current.isPhoneX() {
 maxAspectRatio = 2.16 /// iPhoneX 2.16 ratio
 }else {
 maxAspectRatio = UIDevice.current.isPad() ? (4.0 / 3.0) : (16.0 / 9.0) /// iPhone 16:9,iPad 4:3
 }
 /// 画出可视区域
 drawPayableArea(size: self.size,ratio: maxAspectRatio)
}
// MARK: - command + option + 左or右箭头 可以折叠/拓展函数
// MARK: - 画出可视区域
func drawPayableArea(size:CGSize,ratio:CGFloat){
 /*
 /// 安全区域即用户交互的区域,非可视区域 (iPhoneX的安全区域 < 可视区域)
 let safeInsetTop = self.size.height * AREA_INSET_WIDTH_TOP / iPhoneX_REAL_HEIGHT
 let safeInsetBottom = self.size.height * AREA_INSET_WIDTH_BOTTOM / iPhoneX_REAL_HEIGHT
 let safeHeight = self.size.height - safeInsetTop - safeInsetBottom // 安全区域的高度
 */
 
 playableHeight = size.width / ratio
 playableMargin = (size.height - playableHeight ) / 2.0 /// P70
 playableRect = CGRect(x: 0, y: playableMargin, width: size.width, height: playableHeight) /// 注意 scene的anchorPoint(0,0)原点的位置;
 
 let shapeFrame = SKShapeNode(rect: playableRect)
 shapeFrame.zPosition = 1
 shapeFrame.strokeColor = SKColor.red
 shapeFrame.lineWidth = 5.0
 addChild(shapeFrame)
 
 /// 可视区域的物理状态
 let playableBody = SKPhysicsBody(edgeLoopFrom: playableRect)
 playableBody.friction = 0
 self.physicsBody = playableBody
 playableBody.categoryBitMask = PhysicsCategory.Frame
 playableBody.contactTestBitMask = PhysicsCategory.Ball
 playableBody.collisionBitMask = PhysicsCategory.Ball
 
 /// 地板
 setupFloor()
}
//MARK: - 地板
func setupFloor(){
 let floor = SKNode()
 let startPoint = CGPoint(x: 0.0, y: playableMargin)
 let endPoint = CGPoint(x: self.size.width, y: playableMargin)
 self.addChild(floor)
 floor.physicsBody = SKPhysicsBody(edgeFrom: startPoint, to: endPoint)
 floor.physicsBody?.categoryBitMask = PhysicsCategory.Floor
 floor.physicsBody?.contactTestBitMask = PhysicsCategory.Ball /// 和球相碰
}
//MARK: - 球
func setupBall(){ 
 ballNode = childNode(withName: "ball") as! BallNode
 ballNode.setup(scene:self.scene!) // 导入size与physicsBody
 ballNode.rotate()
 ballNode.physicsBody?.applyImpulse(CGVector(dx: 100.0, dy: -ballInitSpeed)) /// dy的绝对值越大 球速越快; - 表示向下
}
//MARK: - 滑板
func setupSkateboard(){
 skateboard = childNode(withName: "skateboard") as! Skateboard
 skateboard.setup(scene: self.scene!)
}
//MARK: - 鞋子
func setupShose(){
 // 一、直接在场景中加入节点,不利于重复利用,以后每一关卡都要重建,非常麻烦;
 // 1.代码创建精灵节点到GameScene
 // let xPos = self.frame.width / 2
 // let yPos = playableHeight - 100
 // shoseNode = ShoseNode.newInstance(scene: self)
 // shoseNode.position = CGPoint(x: xPos, y: yPos)
 // self.addChild(shoseNode)
 // 2.用Class可视化加入精灵节点
 /*
 shoseNode = childNode(withName: "shose") as! ShoseNodeClass
 shoseNode.newInstance(scene: self.scene!)
 
 let emitter = SKEmitterNode(fileNamed: "Fire")!
 emitter.zPosition = 1
 emitter.targetNode = shoseNode
 emitter.setScale(3.0)
 shoseNode.addChild(emitter)
 */
 // 3.引用其它scene的节点到当前Scene中,需要convert转化到当前GameScene的坐标
 let overlayScene = SKScene(fileNamed: "ShoseScene")!
 let overlayShose = overlayScene.childNode(withName: "Overlay") as! SKSpriteNode
 let gameSceneOverlay = overlayShose.copy() as! SKSpriteNode
 overlayShose.removeFromParent() // 移除旧的
 /* 留意SpirteKit的巨坑
 * When an overlay node with actions is copied there is currently a SpriteKit bug
 * where the node’s isPaused property might be set to true
 * 一定要记得设置为 false 或者所有gamesceneOverlay内的子节点的所有action都不起作用
 */
 gameSceneOverlay.isPaused = false;
 gameSceneOverlay.enumerateChildNodes(withName: "shose") { (node, _) in
 let sprite = node as! ShoseNodeClass
 sprite.newInstance(scene: self.scene!) // 加入物理体;
 }
 gameSceneOverlay.zPosition = 2
 let yPos = self.frame.size.height - playableMargin - 150;
 gameSceneOverlay.position = CGPoint(x: 1024, y: yPos)
 self.addChild(gameSceneOverlay)
 
}
//MARK:背景音乐
func setupBgMusic(){
 let music = SKAudioNode(fileNamed: "bgmusic.mp3")
 music.autoplayLooped = true
 // self.addChild(music)
}
// 返回 -50.0 或 50.0 角度50 已经很小了;
func randomDirection() -> CGFloat {
 var xSpeed:CGFloat = 50.0
 if CGFloat.random(1, max: 100) > 50 {
 xSpeed = -xSpeed
 }
 return xSpeed
}
//MARK: - 时时校验球的运动速度和方向
func verifyBallSpeed(_ dt:TimeInterval){
 
 let xSpeed:CGFloat = abs((ballNode.physicsBody?.velocity.dx)!) /// 水平方向的dx
 let ySpeed:CGFloat = abs((ballNode.physicsBody?.velocity.dy)!)
 /// print("xSpeed:" , xSpeed)
 /// 为什么xSpeed是100,不是凭空乱猜的,可以根据打印出来的xSpeed进行查看(即快接近垂直时的角度差不多为50);
 if xSpeed < 100 { // xSpeed很小,表示球正在上下来回运动 必须赋一个值 让球再次向左右水平方向运动;
 ballNode.physicsBody?.applyImpulse(CGVector(dx: randomDirection(), dy: 0.0))
 }
 if ySpeed < 100 {
 ballNode.physicsBody?.applyImpulse(CGVector(dx: 0.0, dy: randomDirection()))
 }
 /// 三角函数 C(斜边)= sqrt(a*a + b*b) 得出球的运动速度
 let ballSpeed = sqrt((ballNode.physicsBody?.velocity.dx)! * (ballNode.physicsBody?.velocity.dx)! + (ballNode.physicsBody?.velocity.dy)! * (ballNode.physicsBody?.velocity.dy)!)
 /// 防止球的运动速度过快 把球的速度打印出来 就可以知道大概 maxSpeed要设置多少了;
 ballNode.physicsBody?.linearDamping = (ballSpeed > ballMaxSpeed) ? 0.2 : 0.0
 //print("ballSpeed",ballSpeed);
}
// 特效果汁
func emitParticles(particleName: String, sprite: SKSpriteNode) {
 let scenePos = convert(sprite.position, from: sprite.parent!)
 let emitter = SKEmitterNode(fileNamed: "Fire")!
 emitter.zPosition = 5 // 位于鞋子的上方;
 emitter.position = scenePos
 emitter.setScale(3.0)
 self.addChild(emitter)
 sprite.run(SKAction.sequence([
 SKAction.wait(forDuration: TimeInterval(0.5)),
 //SKAction.scale(to: 0.0, duration: TimeInterval(0.08)),
 SKAction.fadeAlpha(to: 0.0, duration: TimeInterval(0.3)),
 SKAction.run {
 emitter.removeFromParent()
 },
 SKAction.run {
 sprite.removeFromParent()
 },
 SKAction.run {
 print ("精灵节点内 hit shoses")
 }
 ]))
}
//MARK: - 实现物理碰撞代理SKPhysicsContactDelegate的didBegin方法
func didBegin(_ contact: SKPhysicsContact) {
 
 let bodyA:SKPhysicsBody
 let bodyB:SKPhysicsBody
 if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
 bodyA = contact.bodyA
 bodyB = contact.bodyB
 }else{
 bodyA = contact.bodyB
 bodyB = contact.bodyA
 }
 
 /// 球和四周发生碰撞
 if (bodyA.categoryBitMask == PhysicsCategory.Ball && bodyB.categoryBitMask == PhysicsCategory.Frame) {
 }
 
 /// 球和鞋子发生碰撞
 if (bodyA.categoryBitMask == PhysicsCategory.Ball && bodyB.categoryBitMask == PhysicsCategory.Shose) {
 // print(PhysicsCategory.Ball ,PhysicsCategory.Shose)
 emitParticles(particleName: "Fire", sprite: bodyB.node as! SKSpriteNode)
 bodyB.node?.physicsBody?.categoryBitMask = PhysicsCategory.None
 }
 
 /// 球和滑板发生碰撞
 if (bodyA.categoryBitMask == PhysicsCategory.Ball && bodyB.categoryBitMask == PhysicsCategory.Skateboard) {
 //print("Skateboard")
 self.run(SoundManager.shareInstanced.hitskateboard)
 }
 
 /// 球和地板发生碰撞
 if (bodyA.categoryBitMask == PhysicsCategory.Ball && bodyB.categoryBitMask == PhysicsCategory.Floor) {
 //print("Game Over")
 self.run(SoundManager.shareInstanced.gameover)
 bodyB.node?.physicsBody?.categoryBitMask = PhysicsCategory.None
 bodyA.node?.physicsBody?.linearDamping = 1.0 /// 阻力为1.0
 bodyA.node?.physicsBody?.restitution = 0.7 /// 反弹;
 self.physicsWorld.gravity = CGVector(dx: 0.0, dy: -9.8)
 }
 
}
//MARK: - 时时更新
override func update(_ currentTime: TimeInterval) {
 
 /// 获取时间差
 if lastUpdateTimeInterval == 0 {
 lastUpdateTimeInterval = currentTime
 }
 dt = currentTime - lastUpdateTimeInterval
 lastUpdateTimeInterval = currentTime
 
 verifyBallSpeed(dt) /// 限制球的速度与方向
}