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override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */
    
    if lastUpdateTime == 0.0 {
        delta = 0
    } else {
        delta = currentTime - lastUpdateTime
    }

    lastUpdateTime = currentTime

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    func fireProjectile(delta:CGFloat) {
    
        if timeSinceLastFire >= 0.15
        {
            let projectile = SKSpriteNode(imageNamed:"laser1")
            projectile.xScale = 0.5
            projectile.yScale = 0.5
            projectile.position = starShip.position
            projectile.position.y += starShip.frame.height / 2
            projectile.zPosition = starShip.zPosition + 1

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override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    /* Called when a touch begins */
    
    for touch in (touches as! Set<UITouch>) {
        let location = touch.locationInNode(self)
        
        moveShipTo(location)
        self.fireWeapon = true
    }
}

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func moveShipTo(location:CGPoint)
{
    starShip.runAction(SKAction.moveTo(location, duration: 0.05))
}

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var starShip:SKSpriteNode!
var timeSinceLastFire:CGFloat = 0.0
var fireWeapon:Bool = false
var lastUpdateTime:NSTimeInterval = NSTimeInterval(0)
var delta:NSTimeInterval = NSTimeInterval(0)

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//
//  GameScene.swift
//  spaceshooter
//
//

import SpriteKit

class GameScene: SKScene {
    

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self.backgroundColor = SKColor.blackColor()

let starFieldEmmiter = SKEmitterNode(fileNamed: "StarField.sks")
starFieldEmmiter.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMaxY(self.frame))
starFieldEmmiter.zPosition = -20
starFieldEmmiter.advanceSimulationTime(NSTimeInterval(starFieldEmmiter.particleLifetime))

self.addChild(starFieldEmmiter)

let starship = SKSpriteNode(imageNamed:"Spaceship")

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//
//  GameScene.swift
//  spaceshooter
//
//

import SpriteKit

class GameScene: SKScene {
    override func didMoveToView(view: SKView) {