Animate spaceship along path

gistfile1.swift

override func didMoveToView(view: SKView) {
    let sprite = SKSpriteNode(imageNamed:"Spaceship")
    sprite.xScale = 0.25
    sprite.yScale = 0.25
    addChild(sprite)
    
    let origin = view.convertPoint(view.bounds.origin, toScene: self)
    let lowerRight = view.convertPoint(CGPoint(x: CGRectGetMaxX(view.bounds), y:CGRectGetMaxY(view.bounds)), toScene: self)
    let visibleFrame = CGRect(x: origin.x, y: origin.y, width: lowerRight.x - origin.x, height: lowerRight.y - origin.y)
    let path = sinePathInRect(visibleFrame)

    let action = SKAction.followPath(path.CGPath, asOffset: false, orientToPath: true, duration: 10)
    sprite.runAction(action)
}