Implementing boundaries

I’m working on a game similar to Pong:

I’m trying to figure out how to constrain the paddle so it can’t leave the viewing frustum. I’m hoping to make this work regardless of the screen dimensions. Anyone know how to do this?

Thanks.

 

http://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html

 

Thanks. I think I got it working.

Here's most of the code:

Code (CSharp):

1.         void Update ()
2.         {
3.                 float dx = Input.GetAxis ("Horizontal");
4.                 transform.Translate (dx, 0, 0);
5.  
6.                 Vector3 left = camera.WorldToScreenPoint (this.collider.bounds.min);
7.  
8.                 if (left.x < 0) {
9.                         // paddle went too far left, needs correction
10.                         left.x = 0;
11.                         Vector3 worldPoint = camera.ScreenToWorldPoint (left);
12.                         transform.position = worldPoint + collider.bounds.extents;
13.  
14.                 }
15.  
16.  
17.  
18.                 Vector3 upperRightVertex = new Vector3 (collider.bounds.max.x, collider.bounds.min.y, collider.bounds.min.z);
19.  
20.                 Vector3 right = camera.WorldToScreenPoint (upperRightVertex);
21.  
22.                 if (right.x > Screen.width) {
23.                         // paddle went too far right, needs correction
24.                         right.x = Screen.width;
25.                         Vector3 worldPoint = camera.ScreenToWorldPoint (right);
26.                         transform.position = worldPoint + new Vector3 (-collider.bounds.extents.x,
27.                                                            collider.bounds.extents.y,
28.                                                            collider.bounds.extents.z);
29.  
30.  
31.                 }
32.  
33.         }