How can I restrict/constrain my drag and drop of sprites to only be on the screen?

Question

I am trying to keep the sprites I drag and drop to be only in the screen. I don´t want it to be possible to drag and drop outside of the screen view. Is it a good way to solve this so I can change the screen size without any problems later?

This is my code so far :

         void OnMouseDown ()
         {
 
                 screenPoint = Camera.main.WorldToScreenPoint (gameObject.transform.position);
 
         }
 
         void OnMouseDrag ()
         {
                         Vector3 currentScreenPoint = new Vector3 (Input.mousePosition.x, 60, screenPoint.z);
                         Vector3 currentPos = Camera.main.ScreenToWorldPoint (currentScreenPoint);
                         transform.position = currentPos;
 
 
         }

This is to use a drag and drop constraint to the X axis to make my own slider. Now, I need it to stop where the screen ends on both sides of the X axis.

Answer 1

Answer by nypraise · Feb 09, 2014 at 12:37 AM

I solved it with using a Mathf.Clamp. First I got confused with Mathf.Clamp because of the documentation mentions Time.time etc. But after watching Will Goldstones tutorial on it I figured it out : http://www.youtube.com/watch?v=ZggxVn93ePI

Here is my C# code for it :

         void Update(){
 
         transform.position =  new Vector3(Mathf.Clamp(transform.position.x, -5.0f, 5.0f),0,0);
 
         }

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How can I restrict/constrain my drag and drop of sprites to only be on the screen?

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