Changing the radius of a 2d circular collider

Unity Engine
1

I’ve been experimenting with something lately and I wanted to change the radius of a circle collider using code at runtime and not manually to change it in the editor is there any way of doing this?

I did some research and I’m not sure how to achieve this.

This is what I’ve been trying to do:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerStatus : MonoBehaviour
{
    public float hp = 100;

    public float attack = 20;
    public float attackSpeed = 10;
    public float attackRange = 15;

    private Collider2D attackRangeCollider;
    private Collider2D playerCollider;

    // Start is called before the first frame update
    void Start()
    {
        attackRangeCollider = GetComponent<CircleCollider2D>();
        playerCollider = GetComponent<BoxCollider2D>();
       

        //Vector2 radiusVector = new Vector2(attackRange, attackRange);

        attackRangeCollider.bounds.Expand(attackRange);

    }

    // Update is called once per frame
    void Update()
    {


        attackRangeCollider.bounds.Encapsulate(new Vector3 (transform.position.x + attackRange, transform.position.y + attackRange, transform.position.z));

    }
}
2

See your line 13? That declares the collider as a generic Collider2D.

If you change that variable type to CircleCollider2D, then you can use that variable to access the circle-specific property called .radius and get what you want.

Also: take out the fiddling with the bounds on line 25. Bounds will almost never get what you want…

3

Thanks so much, I’ve been trying to find out how to do this. I saw this property in the unity documentation and I tried to find it but I could not find where it was. This helped a lot. Thanks so much.

1 Like