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Question by kavindu96 · May 28, 2021 at 04:44 AM · c#unity 2dscoredrag-and-drop

How to add a score when the correct object drags to the correct box?

I have created a 2d drag and drop game using mouse control. But I don't know how to add a score when the correct object drags to the correct box. what I need is, when the object overlaps the correct object the score must be increased. This is my code,

 public class Drag : MonoBehaviour{
 
     public GameObject correctForm,carrot,circle;
     private bool moving;
     private bool finish;
 
     private float startPosX;
     private float startPosY;
 
     private Vector3 resetPosition;
 
     void Start()
     {
         resetPosition = this.transform.localPosition;
     
     }
 
     void Update()
     {
         if(finish == false)
         {
             if (moving)
             {
                 Vector3 mousepos;
                 mousepos = Input.mousePosition;
                 mousepos = Camera.main.ScreenToWorldPoint(mousepos);
 
                 this.gameObject.transform.localPosition = new Vector3(mousepos.x - startPosX, mousepos.y - startPosY, this.gameObject.transform.localPosition.z);
             }
         }
         
     }
 
     public void OnMouseDown()
     {
 
         if(Input.GetMouseButtonDown(0))
         {
             Vector3 mousepos;
             mousepos = Input.mousePosition;
             mousepos = Camera.main.ScreenToWorldPoint(mousepos);
 
             startPosX = mousepos.x - this.transform.localPosition.x;
             startPosY = mousepos.y - this.transform.localPosition.y;
 
             moving = true;
         }
     }
 
     public void OnMouseUp()
     {
 
         moving = false;
 
         if(Mathf.Abs(this.transform.localPosition.x - correctForm.transform.localPosition.x) <= 0.5f &&
             Mathf.Abs(this.transform.localPosition.y - correctForm.transform.localPosition.y) <=0.5f)
         {
             this.transform.position = new Vector3(correctForm.transform.position.x, correctForm.transform.position.y, correctForm.transform.position.z);
             //MyscoreText.text = "Score : " + ScoreNum;
             //Destroy(coin);
             finish = true;
             
             if(moving == false)
             {
                 Score.ScoreNum += 2;
             }
             
         }
         else
         {
             this.transform.localPosition = new Vector3(resetPosition.x, resetPosition.y, resetPosition.z);
         }
     }
 
 }


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Answer by eneIr · May 28, 2021 at 12:05 PM

In short, you should use OnDrag() and OnDrop() (add IDropHandler next to Monobehaviour). For more details, you can search Drag and drop in unity on YouTube, there're lots of tutorials.

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