SpriteKit 시도 path 11개를 사용하여 Homming

if (enemy.enemyColor == SKColor.greenColor()) {

    // プレイヤーの位置
    let dragon: DragonUnit = childNodeWithName("dragon") as! DragonUnit
    // CGPath の宣言
    let path:CGMutablePath = CGPathCreateMutable()
    let y = Int(arc4random() % 450) + 150
    // 始点を決定
    CGPathMoveToPoint(path, nil, CGRectGetMaxX(self.frame), CGFloat(y))

    var cp1x : CGFloat = (2 * CGRectGetMaxX(self.frame) + dragon.position.x)/3
    var cp1y : CGFloat = CGRectGetMinY(self.frame)
    var cp2x : CGFloat = (CGRectGetMaxX(self.frame) + 2 * dragon.position.x)/3
    var cp2y : CGFloat = CGRectGetMaxY(self.frame)

    //最終目標はプレイヤー
    CGPathAddCurveToPoint(path, nil, cp1x, cp1y, cp2x, cp2y, dragon.position.x,     dragon.position.y)

    //プレイヤーの位置から画面の端までの動き                     
    cp1x = dragon.position.x - (CGRectGetMaxX(self.frame) - dragon.position.x)/3
    cp1y = CGRectGetMinY(self.frame)
    cp2x = dragon.position.x - (CGRectGetMaxX(self.frame) - dragon.position.x)*2/3
    cp2y = CGRectGetMaxY(self.frame)

    CGPathAddCurveToPoint(path, nil, cp1x, cp1y, cp2x, cp2y,    CGRectGetMinX(self.frame), CGRectGetMidY(self.frame))

    //作ったCGPathをSKActionにセット
    let sequenceLeft = SKAction.followPath(path, asOffset: false,orientToPath: false, duration: 3.0)
    let remove = SKAction.removeFromParent()
    let sequence = SKAction.sequence([sequenceLeft, remove])

    // 敵SKSpriteNodeのrunActionにセット 
    enemy.runAction(sequence)
}

var enemyShot1Last:CFTimeInterval! // 敵ショットタイミング

override func update(currentTime: CFTimeInterval) {

  //敵ショット
     if(enemyShot1Last == nil){
         enemyShot1Last = currentTime
     }

     if(enemyShot1Last+1.5 <= currentTime){
         if(!self.paused){
             enemyShot1Fire()
         }
         enemyShot1Last = currentTime
     }
}

if (enemy.enemyColor == SKColor.yellowColor()){
    enemy.name = "yellow"
}

if((childNodeWithName("yellow")) != nil){
    let action = SKAction.animateWithTextures([b1, b2, b3, b4], timePerFrame: 0.5)
    fire.runAction(SKAction.repeatActionForever(action))
    fire.size = CGSizeMake(60, 60)

    fire.position.x = enemyYellow.position.x + 5
    fire.position.y = enemyYellow.position.y

    let dragon: DragonUnit = childNodeWithName("dragon") as! DragonUnit

    let path:CGMutablePath = CGPathCreateMutable()

    // ｙの座標算出
    let y2 : CGFloat = fire.position.y -
     (fire.position.x * (fire.position.y -  dragon.position.y))/
     (fire.position.x - dragon.position.x)

    CGPathMoveToPoint(path, nil, fire.position.x, fire.position.y)
    CGPathAddLineToPoint(path, nil, 0, y2)

    fire.runAction(sequence)

    self.addChild(fire)
}