Restraining moving area of a draggable UI element

Question

scene image

The image I sent is from one of the game modes of an educational game that I'm making. This mode would consist in dragging that purple object horizontally between the two red gizmos and never vertically. I've succeded in making it draggable, but none of my attempts have been successful in restraining the movement in the way I want to.

 public void OnDrag(PointerEventData eventData) {        
         Vector2 localPos = Vector2.zero;
         RectTransformUtility.ScreenPointToLocalPointInRectangle(rect, Input.mousePosition, Camera.main, out localPos);
         transform.position = transform.TransformPoint(localPos);
     }

This game is intended to be used on smartphones and the proper conversions will be made in the future, so I could consider moving the object by screen buttons or swipes if thing don't go my way.

Can anyone help me?

Answer 1

Best Answer

Answer by MSavioti · Jan 05, 2019 at 09:56 PM

Thanks to @JxWolfe (thank you very much!), I arrived in a solution:

 public class PlayerScript : MonoBehaviour, IDragHandler {
     [SerializeField]
     public Image image;
 
     private float leftLimit;
     private float rightLimit;
     private RectTransform rect;
 
     private void Start() {
         rect = GetComponent<RectTransform>();
     }
 
     public void OnDrag(PointerEventData eventData) {
         Vector2 localPos = Vector2.zero;
         RectTransformUtility.ScreenPointToLocalPointInRectangle(rect, Input.mousePosition, Camera.main, out localPos);                
 
         if (transform.TransformPoint(new Vector2(localPos.x, 0)).x >= leftLimit
                 && transform.TransformPoint(new Vector2(localPos.x, 0)).x <= rightLimit) {
 
             transform.position = transform.TransformPoint(new Vector2(localPos.x, 0));
         }
     }
 }

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JxWolfe · Jan 05, 2019 at 09:58 PM 0

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glad to be of help! $$anonymous$$eep on program$$anonymous$$g!

Restraining moving area of a draggable UI element

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