Object not being dragged

Question

Trying to drag a GameObject with a Sprite renderer and 2d Collision Box. I try to run t$$anonymous$$s:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class pieceMovement : MonoBehaviour
 {
 
     private float startPosX;
     private float startPosY;
     private bool beingHeld = false;
 
     // Update is called once per frame
     void Update()
     {
         
         if(beingHeld)
         {
             
             Vector3 mousePos;
             mousePos = Input.mousePosition;
             mousePos = Camera.main.ScreenToWorldPoint(mousePos);
 
             t$$anonymous$$s.gameObject.transform.localPosition = new Vector3(mousePos.x, mousePos.y, 0);
 
         }
 
     }
 
     private void OnMouseDown()
     {
 
         if(Input.GetMouseButtonDown(0))
         {
 
             Vector3 mousePos;
             mousePos = Input.mousePosition;
             mousePos = Camera.main.ScreenToWorldPoint(mousePos);
 
             beingHeld = true;
 
         }
 
     }
 
     private void OnMouseUp()
     {
 
         beingHeld = false;
 
     }
 }

But I get t$$anonymous$$s error:

 NullReferenceException: Object reference not set to an instance of an object
 pieceMovement.OnMouseDown () (at Assets/pieceMovement.cs:37)
 UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32)

Answer 1

One problem I see is t$$anonymous$$s :

  Vector3 mousePos;
              mousePos = Input.mousePosition;
              mousePos = Camera.main.ScreenToWorldPoint(mousePos);

Should look more like t$$anonymous$$s:

 public Vector3 mousePos;
 
 void Update()
 {
     mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
 }

And secondly :

 /// makes no sense
 t$$anonymous$$s.gameObject.transform.localPosition = new Vector3(mousePos.x, mousePos.y, 0);
 
 // if t$$anonymous$$s script is the object in questions script
 transform.position = new Vector2(mousePos.x, mousePos.y);
 
 // if t$$anonymous$$s object in question is in another script
 otherObject.transform.position = new Vector2(mousePos.x, mousePos.y);

^ T$$anonymous$$s is of course assuming that you are not dealing with parents, and are not trying to move the c$$anonymous$$lds local position relative to the parents position.

But t$$anonymous$$s is the reference to the script in question. So if your trying to call the script you are already in? t$$anonymous$$s is redundant. That would only be needed if t$$anonymous$$s was a parent class that was hold Lists of the c$$anonymous$$ldren scripts, but the function itself was in the parent, and the c$$anonymous$$ld was calling it? then yes, you would need to say somet$$anonymous$$ng like:

 public void StartBeingDragged()
 {
      otherObject = (otherClassName)t$$anonymous$$s.gameObject;
 }

^ Very poorly said, but hopefully you get the idea.

Object not being dragged

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