BlockBreakerRogueLite/Assets/Scripts/BallEffects/ExplosiveHitEffect.cs

using UnityEngine;

public class ExplosiveHitEffect : BallEffectBase
{
    private ExplosiveHitEffectDefinition Config => definition as ExplosiveHitEffectDefinition;

    public override void OnHitBlock(BallScript ball, blockScript hitBlock, Collision2D collision)
    {
        ExplosiveHitEffectDefinition config = Config;
        if (config == null)
            return;

        Vector2 center = collision.GetContact(0).point;
        blockScript[] blocks = FindObjectsByType<blockScript>(FindObjectsSortMode.None);

        for (int i = 0; i < blocks.Length; i++)
        {
            blockScript block = blocks[i];
            if (block == null)
                continue;

            float distance = Vector2.Distance(center, block.transform.position);
            if (distance > config.Radius)
                continue;

            float t = Mathf.Clamp01(distance / config.Radius);
            float splashDamage = Mathf.Lerp(config.MaxDamageAtCenter, config.MinDamageAtEdge, t);
            block.ApplyDamage(splashDamage);
        }
    }
}