Drag object with mouse in diagonal direction

I have a gameobject which i want to move using mouse. Currently i can do that in x-axis and y-axis:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class MoveObject : MonoBehaviour
 {
     public bool canMoveObject = true;
 
     public LineController currentLineController;
     public bool childGO;
     public GameObject goToMove;
 
     public bool moveDiagonal;
     public bool moveX, moveY;
     public float distanceXmin, distanceXmax, distanceYmin, distanceYmax;
 
     public Vector3 screenPoint;
     public Vector3 offset;
 
     public Vector3 curPosition;  
 
     private void OnEnable()
     {
         if (canMoveObject)
             gameObject.tag = "MoveableObstacle";
     }
 
     void OnMouseDown()
     {
         if (canMoveObject )//&& !PinchZoom.Instance.IS_ZOOMING)
         {
             currentLineController.CAN_DRAW = false;
 
             if (childGO)
                 goToMove = gameObject.transform.parent.gameObject;
             else
                 goToMove = gameObject;
 
             screenPoint = Camera.main.WorldToScreenPoint(goToMove.transform.position);
             offset = goToMove.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
             //}
         }
     }
 
     private void OnMouseDrag()
     {
         if (canMoveObject )//&& !PinchZoom.Instance.IS_ZOOMING)
         {
             Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
             curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
 
             if (moveDiagonal)
             {
                
             }
             else
             {
                 if (moveX)
                 {
                     if (curPosition.x >= distanceXmin && curPosition.x <= distanceXmax)
                         goToMove.transform.position = new Vector3(curPosition.x, goToMove.transform.position.y, 0);
                 }
                 else if (moveY)
                 {
                     if (curPosition.y >= distanceYmin && curPosition.y <= distanceYmax)
                         goToMove.transform.position = new Vector3(goToMove.transform.position.x, curPosition.y, 0);
                 }
             }
             //}
         }
     }
 
     private void OnMouseUp()
     {
         currentLineController.CAN_DRAW = true;
     }
 }

I wanted to move my object diagonally as well how to do that according to its direction using mouse?