Swift游戲實戰-跑酷熊貓 14 熊貓打滾

本文轉載自查看原文 2014-08-08 12:12 1388 Swift

這節內容我們來實現熊貓打滾。思路是這樣的，當熊貓起跳時記錄他的Y坐標，落到平台上的時候再記錄它的Y坐標。兩個坐標之間的差要是大於一定數值就判斷它從高處落下要進行打滾緩沖。至此跑酷熊貓已經像一個游戲的樣子了

要點：

起跳y坐標：

var jumpStart = 0.0

落地y坐標：

var jumpEnd = 0.0

在didBeginContact方法中進行判斷

panda.jumpEnd = panda.position.y
if panda.jumpEnd-panda.jumpStart <= -70 {
        panda.roll()
}

整體代碼：本節關鍵部分已加紅加粗

GameScene：

import SpriteKit

class GameScene: SKScene,ProtocolMainScene ,SKPhysicsContactDelegate{
    
    @lazy var panda = Panda()
    @lazy var platformFactory = PlatformFactory()
    @lazy var bg = BackGround()
    
    var moveSpeed:CGFloat = 15
    var lastDis = 0.0
    
    func didBeginContact(contact: SKPhysicsContact!) {
        
        if (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask) == ( BitMaskType.platform | BitMaskType.panda ){
            panda.run()
            
            panda.jumpEnd = panda.position.y if panda.jumpEnd-panda.jumpStart <= -70 { panda.roll() }
        }
        
        if (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask) == ( BitMaskType.scene | BitMaskType.panda ){
            println("游戲結束！")
        }
    }
    func didEndContact(contact: SKPhysicsContact!){
        panda.jumpStart = panda.position.y
        
    }
    override func didMoveToView(view: SKView) {
        let skyColor = SKColor(red:113/255,green:197/255,blue:207/255,alpha:1)
        self.backgroundColor = skyColor
        
        //背景
        self.addChild(bg)
        bg.zPosition = 20
        
        self.physicsWorld.contactDelegate = self
        self.physicsWorld.gravity = CGVectorMake(0, -5)
        self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
        self.physicsBody.categoryBitMask = BitMaskType.scene
        self.physicsBody.dynamic = false
        
        panda.position = CGPointMake(200, 400)
        panda.zPosition = 40
        self.addChild(panda)
        
        self.addChild(platformFactory)
        platformFactory.sceneWidth = self.frame.size.width
        platformFactory.delegate = self
        platformFactory.zPosition = 30
        platformFactory.createPlatform(3, x: 0, y: 200)

    }
    
    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        panda.jump()
    }
   
    override func update(currentTime: CFTimeInterval) {
        bg.move(moveSpeed/5)
        lastDis -= moveSpeed
        if lastDis <= 0 {
            println("生成新的平台")
            //platformFactory.createPlatform(1, x: 1500, y: 200)
            platformFactory.createPlatformRandom()
        }
        platformFactory.move(moveSpeed)
    }
    func onGetData(dist:CGFloat){
        self.lastDis = dist;
    }
}
protocol ProtocolMainScene {
    func onGetData(dist:CGFloat)
}

Panda類

import SpriteKit

enum Status:Int{
    case run=1,jump,jump2,roll;
}

class Panda : SKSpriteNode {
    let runAtlas = SKTextureAtlas(named: "run.atlas")
    let runFrames = [SKTexture]()
    
    let jumpAtlas = SKTextureAtlas(named: "jump.atlas")
    let jumpFrames = [SKTexture]();
    
    let rollAtlas = SKTextureAtlas(named: "roll.atlas")
    let rollFrames = [SKTexture]();
    
    var status = Status.run
    //起跳 y坐標
    var jumpStart = 0.0
    //落地 y坐標
    var jumpEnd = 0.0


    init(){
        let texture = runAtlas.textureNamed("panda_run_01")
        let size = texture.size()
        super.init(texture:texture,color:SKColor.whiteColor(),size:size)
        
        var i:Int
        for i=1 ; i<=runAtlas.textureNames.count ; i++ {
            let tempName = String(format: "panda_run_%.2d", i)
            let runTexture = runAtlas.textureNamed(tempName)
            if runTexture {
                runFrames.append(runTexture)
            }
        }
        for i=1 ; i<=jumpAtlas.textureNames.count ; i++ {
            let tempName = String(format: "panda_jump_%.2d", i)
            let jumpTexture = jumpAtlas.textureNamed(tempName)
            if jumpTexture {
                jumpFrames.append(jumpTexture)
            }
        }
        for i=1 ; i<=rollAtlas.textureNames.count ; i++ {
            let tempName = String(format: "panda_roll_%.2d", i)
            let rollTexture = rollAtlas.textureNamed(tempName)
            if rollTexture {
                rollFrames.append(rollTexture)
            }
        }
        
        self.physicsBody = SKPhysicsBody(rectangleOfSize: texture.size())
        self.physicsBody.dynamic = true
        self.physicsBody.allowsRotation = false
        //摩擦力
        self.physicsBody.restitution = 0
        self.physicsBody.categoryBitMask = BitMaskType.panda
        self.physicsBody.contactTestBitMask = BitMaskType.scene | BitMaskType.platform
        self.physicsBody.collisionBitMask = BitMaskType.platform
        run()
    }
    func run(){
        self.removeAllActions()
        self.status = .run
        self.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(runFrames, timePerFrame: 0.05)))
    }
    
    func jump (){
        self.removeAllActions()
        if status != Status.jump2{
            self.runAction(SKAction.animateWithTextures(jumpFrames, timePerFrame: 0.05))
            self.physicsBody.velocity = CGVectorMake(0, 450)
            if status == Status.jump{
                status = Status.jump2
                self.jumpStart = self.position.y;
            }else {
                status = Status.jump
            }
        }
        
    }
    
    func roll(){
        self.removeAllActions()
        status = .roll
        self.runAction(SKAction.animateWithTextures(rollFrames, timePerFrame: 0.05),completion:{() in self.run()})
    }
    
}