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

public class CircleDissolveEffect : MonoBehaviour
{
    public Material dissolveMaterial;
    public Image targetImage; // 使用的UI图片
    public float transitionSpeed = 1.0f;
    private float radius = 0.0f;
    public bool isTransitioning = false;

    void Start()
    {
        // 计算宽高比并应用到Shader
        float aspectRatio = (float)targetImage.rectTransform.rect.width / targetImage.rectTransform.rect.height;
        dissolveMaterial.SetFloat("_AspectRatio", aspectRatio);
    }

    void Update()
    {
        if (isTransitioning)
        {
            if (radius < 1f)
            {
                radius += Time.deltaTime * transitionSpeed;
                dissolveMaterial.SetFloat("_Radius", Mathf.Clamp01(radius));
            }
        }
        else
        {
            if (radius > 0f)
            {
                radius -= Time.deltaTime * transitionSpeed;
                dissolveMaterial.SetFloat("_Radius", Mathf.Clamp01(radius));
            }
        }
    }

    public void StartTransition()
    {
        radius = 0.0f;
        isTransitioning = true;
    }
}