Question Why the collision between line and object is not detected in unity c#?

Hi Unity.. i have some problem i wanted to do a collision between a line drawn by the user with a checkpoint/object in 2d game.. But when the line is passing through the object it not debug any message that it already collided..

You can view my game image and video from the link below
https://drive.google.com/drive/folders/1OjEqGKxpcSkjEVROqQI-W-Vwk7w2uxfV?usp=drive_link

I already try all possible combination.. methods also i already try both OnCollision and OnTriggered and i also try with and without rigidbody.. the triggered checked also i try..

below is my code for the Checkpoint, Drawline and DrawnLineColliderUpdater.. I hope anyone can help me it so urgent.. sorry for my bad English..

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class CP : MonoBehaviour
6. {
7.     /*
8.     void OnTriggerEnter(Collider other)
9.     {
10.         Debug.Log("Checkpoint Collision Enter");
11.         //Note: we use colliders here, not collisions
12.         if (other.gameObject.tag == "DrawnLine")
13.         {
14.             Debug.Log("Collided");
15.         }
16.     }*/
17.        
18.         private void OnCollisionEnter2D(Collision2D collision)
19.     {
20.         Debug.Log("Checkpoint Collision Enter");
21.         if (collision.gameObject.CompareTag("DrawnLine"))
22.         {
23.             Debug.Log("Collide!!");
24.         }
25.     }
26. }

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class DrawLine : MonoBehaviour
6. {
7.     private LineRenderer lineRenderer;
8.     private bool isDrawing = false;
9.  
10.     void Start()
11.     {
12.         lineRenderer = GetComponent<LineRenderer>();
13.         lineRenderer.positionCount = 0; // Start with an empty line.
14.     }
15.  
16.     void Update()
17.     {
18.         // Check for user input to start/stop drawing.
19.         if (Input.GetMouseButtonDown(0))
20.         {
21.             isDrawing = true;
22.             lineRenderer.positionCount = 1; // Start with one point.
23.             lineRenderer.SetPosition(0, GetMousePosition());
24.         }
25.         else if (Input.GetMouseButtonUp(0))
26.         {
27.             isDrawing = false;
28.         }
29.  
30.         // Continue drawing while the mouse button is held down.
31.         if (isDrawing && Input.GetMouseButton(0))
32.         {
33.             int newPositionCount = lineRenderer.positionCount + 1;
34.             lineRenderer.positionCount = newPositionCount;
35.             lineRenderer.SetPosition(newPositionCount - 1, GetMousePosition());
36.         }
37.     }
38.  
39.     Vector3 GetMousePosition()
40.     {
41.         // Get the mouse position in world space.
42.         Vector3 mousePosition = Input.mousePosition;
43.         mousePosition.z = 10f; // Set an appropriate z-value for your scene.
44.         return Camera.main.ScreenToWorldPoint(mousePosition);
45.     }
46. }

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5.  
6. [RequireComponent(typeof(LineRenderer))]
7. public class DrawnLineColliderUpdater : MonoBehaviour
8. {
9.     private LineRenderer lineRenderer;
10.     private PolygonCollider2D lineCollider;
11.  
12.     void Start()
13.     {
14.         lineRenderer = GetComponent<LineRenderer>();
15.         lineCollider = transform.Find("ColliderContainer").GetComponent<PolygonCollider2D>();
16.     }
17.  
18.     void Update()
19.     {
20.         // Copy LineRenderer's positions to the PolygonCollider2D's points.
21.         Vector2[] colliderPoints = new Vector2[lineRenderer.positionCount];
22.         for (int i = 0; i < lineRenderer.positionCount; i++)
23.         {
24.             colliderPoints[i] = lineRenderer.GetPosition(i);
25.         }
26.  
27.         // Update the PolygonCollider2D's points.
28.         lineCollider.points = colliderPoints;
29.     }
30. }

 

The documentation for PolygonColldier2D specifies that "The edge must enclose an area for the collider to work." You're going to have to make a collider with an area, instead of just a line.