Stop Pong Paddle from moving offscreen

Question

I'm making a Pong game. I can move the paddle upwards but I can't stop it from disappearing offscreen. How do I make it so that, when it reaches the top of the screen, the paddle will stop. I'm using Java.

This is my code so far:

 #pragma strict
 
 //Create a variable to hold player's speed
 var speed:int = 10;
 
 
 
 function Update ()
 {
     //Player input
     if(Input.GetButton("UP"))
     {
         transform.Translate(Vector3(0,speed,0) * Time.deltaTime);
     }
     if(Input.GetButton("Down"))
     {
         transform.Translate(Vector3(0,-speed,0) * Time.deltaTime);
     }
     //Check top bounds
     if (transform.position.y > 14) 
     {
         transform.position.y = 14;
     }
     
 }

It's the part after //Check top bounds that I'm having difficulty with. Thanks in advance.

Answer 1

Answer by kyrnal · May 28, 2014 at 07:15 PM

Setting manual limits in space is a rock solid way to have it stop. It can be automated to get screen dimensions if need be.

 #pragma strict
 
 var speed: float;
 var limitUp: float;
 var limitDown: float;
 
 private var myTransform: Transform;
 private var pos: Vector3;
 
 function Start ()
 {
     myTransform = gameObject.transform;
 }
 
 function Update ()
 {
 
     pos = myTransform.position;
 
     if(Input.GetButton("UP"))
     {
           if(myTransform.position.y >= limitDown)
           {
               pos.y -= speed;
           }
     }
      
     if(Input.GetButton("Down"))
     {
           if(myTransform.position.y <= limitUp)
           {
               pos.y += speed;
           }
     }
     
     myTransform.position = pos;
 
 }

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Answer 2

Answer by ericdl · May 28, 2014 at 07:04 PM

Your code works. Make sure to set your camera's size property to an appropriate number in the inspector panel. Or, in your code change the transform.position.y bounds check to something smaller than 14.

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Answer 3

Answer by fafase · May 28, 2014 at 07:48 PM

Place two objects in your scene at the position you want the pad to stop an drag them into the slots.

 public Transform top;
 public Transform bottom;
 
 void Update()
 {
     float sign = Input.GetAxis("Vertical"));
     if(sign == 0) return;

     Vector3 pos = transform.position;
     pos.y += speed * Time.deltaTime * sign;
     pos.y = Mathf.Clamp(pos.y, bottom.position.y, top.position.y);
 
 }

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Stop Pong Paddle from moving offscreen

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