using UnityEngine;

public class PointArrowInBox : MonoBehaviour
{
    [SerializeField] Rect viewBox;
    [SerializeField] RectTransform arrow;
    [SerializeField] RectTransform target;

    Vector2 halfSize;

    private void Start()
    {
        halfSize = new Vector2(viewBox.width / 2, viewBox.height / 2);
    }

    private void LateUpdate()
    {
        Vector2 arrowPos = target.anchoredPosition;
        arrowPos.x = Mathf.Clamp(arrowPos.x, viewBox.x - halfSize.x, viewBox.x + halfSize.x);
        arrowPos.y = Mathf.Clamp(arrowPos.y, viewBox.y - halfSize.y, viewBox.y + halfSize.y);

        float arrowAngle = Mathf.Atan2(target.anchoredPosition.y - viewBox.position.y, target.anchoredPosition.x - viewBox.position.x) * Mathf.Rad2Deg;

        arrow.anchoredPosition = arrowPos;
        arrow.localEulerAngles = new Vector3(0, 0, arrowAngle);
    }

    public void SetViewBox(Rect viewBox)
    {
        this.viewBox = viewBox;
        halfSize = new Vector2(viewBox.width / 2, viewBox.height / 2);
    }
}