Check to see if item is in correct slot

Question

I'm making a game where players have to drag letters into the correct slot to solve an anagram puzzle.

I have 2 components: the letter (which is a UI Image) and a slot (also a UI Image)

The letter has this script on it which handles the drag and drop:

 [SerializeField] private Canvas canvas;
 private RectTransform rectTransform;
 private CanvasGroup canvasGroup;
 
     private void Awake(){
 rectTransform = GetComponent<RectTransform>();
 canvasGroup = GetComponent<CanvasGroup>();
     }
      public void OnBeginDrag(PointerEventData eventData){
          canvasGroup.alpha = .6f;
          canvasGroup.blocksRaycasts = false;
      }
       public void OnDrag(PointerEventData eventData){
          rectTransform.anchoredPosition += eventData.delta/ canvas.scaleFactor;
       }
       public void OnEndDrag(PointerEventData eventData){
            canvasGroup.alpha = 1f;
           canvasGroup.blocksRaycasts = true;
       }
     public void OnPointerDown(PointerEventData eventData){
     }

And the slot has this script, which is meant to make the letter snap to the slot:

 public void OnDrop (PointerEventData eventData){
     Debug.Log ("OnDrop");
   if (eventData.pointerDrag !=null){
       eventData.pointerDrag.GetComponent<RectTransform>().anchoredPosition = GetComponent<RectTransform>().anchoredPosition;
   }
 }

Once the player has dragged all the letters into slots, they press a 'Submit' button. At this point I want to check that the correct letter is in the correct slot (i.e. Slot 1 should contain Letter A).

How would I go about this?

Answer 1

Best Answer

Answer by pauldarius98 · Mar 02, 2021 at 01:07 PM

Create a letter class that derives from MonoBehaviour and has an Id (and any other information that you might need) and add it to your draggable letter

 public class Letter : MonoBehaviour
 {
     public string Id;
 }

Then in your Slot script add 1 field for the Id (public string Id), one private field droppedId and a method IsCorrect like below:

 public class Slot : MonoBehaviour, IDropHandler
 {
     public string Id;
     
     private string droppedItemId = string.Empty;
     
     public bool IsCorrect
     {
         return Id == droppedItemId;
     }
     
     public void OnDrop (PointerEventData eventData){
         Debug.Log ("OnDrop");
         if (eventData.pointerDrag !=null){
             eventData.pointerDrag.GetComponent<RectTransform>().anchoredPosition = GetComponent<RectTransform>().anchoredPosition;
             var letter = eventData.pointerDrag.GetComponent<Letter>();
             
             if (letter != null)
             {
                 droppedItemId = letter.Id;
             }
             else
             {
                 Debug.LogError("There was no letter attached to the dropped item!");
             }
         }
     }
 }

Now you can check for each slot if the item dropped is the right one by using slot.IsCorrect, just make sure to assign the right ids for letters and slots

Add comment · Show 2 · Share

DJgray3D · Mar 02, 2021 at 02:54 PM 1

Share

Excellent! This works wonderfully, thank you.

pauldarius98 DJgray3D · Mar 02, 2021 at 02:58 PM 0

Share

You're welcome!

Check to see if item is in correct slot

1 Reply

Your answer

Follow this Question

Related Questions