using UnityEngine;
using UnityEngine.UI;

public class PanelImage : Image
{
    // 覆盖 Raycast 方法
    public override bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
    {
        // 获取当前Image的RectTransform
        RectTransform rectTransform = this.rectTransform;

        // 将屏幕坐标转换为Image的局部坐标
        Vector2 localPoint;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, eventCamera, out localPoint);

        // 将局部坐标转换为贴图坐标
        Vector2 normalizedPoint = new Vector2(
            (localPoint.x - rectTransform.rect.x) / rectTransform.rect.width,
            (localPoint.y - rectTransform.rect.y) / rectTransform.rect.height
        );

        // 确保坐标在0到1之间
        if (normalizedPoint.x < 0 || normalizedPoint.x > 1 || normalizedPoint.y < 0 || normalizedPoint.y > 1)
        {
            return false;
        }

        // 获取当前图片的Sprite（确保图片是Sprite类型）
        if (sprite == null || sprite.texture == null)
        {
            return true;
        }

        // 计算在纹理上的像素位置
        int x = Mathf.FloorToInt(normalizedPoint.x * sprite.texture.width);
        int y = Mathf.FloorToInt(normalizedPoint.y * sprite.texture.height);

        // 检查该像素是否透明
        Color pixelColor = sprite.texture.GetPixel(x, y);
        return pixelColor.a > 0.1f;  // 如果透明度小于0.1，视为透明区域
    }
}