Swift: Shoot Sprite at the specific direction

Determine shooting direction

func + (left: CGPoint, right: CGPoint) -> CGPoint {
    return CGPoint(x: left.x + right.x, y: left.y + right.y)
}
 
func - (left: CGPoint, right: CGPoint) -> CGPoint {
    return CGPoint(x: left.x - right.x, y: left.y - right.y)
}
 
func * (point: CGPoint, scalar: CGFloat) -> CGPoint {
    return CGPoint(x: point.x * scalar, y: point.y * scalar)
}
 
func / (point: CGPoint, scalar: CGFloat) -> CGPoint {
    return CGPoint(x: point.x / scalar, y: point.y / scalar)
}
 
#if !(arch(x86_64) || arch(arm64))
    func sqrt(a: CGFloat) -> CGFloat {
    return CGFloat(sqrtf(Float(a)))
    }
#endif
 
extension CGPoint {
    func length() -> CGFloat {
        return sqrt(x*x + y*y)
    }
    
    func normalized() -> CGPoint {
        return self / length()
    }
}
 override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
        
        let touch = touches.first as! UITouch
        let touchLocation = touch.locationInNode(self)
        let projectile = SKSpriteNode(imageNamed: "projectile")
        // add projectile to shooter location
        projectile.position = shooter.position // set projectile to the shooter postion
        self.addChild(projectile)
        
        let offset = touchLocation - projectile.position
        if offset.x < 0 { return }
        // calculate the direction to shoot
        let direction = offset.normalized()
        // add enough so that projectile pass the screen
        let shootAmount = direction * 1000
        // set the projectile direction from shooter
        let realDistance = shootAmount + projectile.position
        let actionMove = SKAction.moveTo(realDistance, duration: 1)
        let actionDone = SKAction.removeFromParent()
        projectile.runAction(SKAction.sequence([actionMove,actionDone]))
    }