using System;
using UnityEditor;
using UnityEngine;

// 创建正六边形网格的脚本
public class HexagonMesh : MonoBehaviour
{
    public float radius = 1f; // 六边形的边长
    public float offset = 30f; // 30f or 0f

    void Start()
    {
        RefreshMesh(offset);
    }

    void RefreshMesh(float offset)
    {
        Mesh mesh = new Mesh();
        Vector3[] vertices = new Vector3[7];
        int[] triangles = new int[18];

        // 计算六个顶点
        for (int i = 0; i < 6; i++)
        {
            float angle = Mathf.Deg2Rad * (60 * i) + offset;
            vertices[i] = new Vector3(radius * Mathf.Cos(angle), radius * Mathf.Sin(angle), 0);
        }

        vertices[6] = Vector3.zero; // 六边形的中心点

        // 设置三角形的索引
        for (int i = 0; i < 6; i++)
        {
            triangles[i * 3] = 6; // 中心点
            triangles[i * 3 + 1] = i; // 当前顶点
            triangles[i * 3 + 2] = (i + 1) % 6; // 下一个顶点
        }

        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.RecalculateNormals();
        mesh.RecalculateBounds();

        MeshFilter meshFilter = gameObject.AddComponent<MeshFilter>();
        meshFilter.mesh = mesh;
        var meshRenderer = gameObject.AddComponent<MeshRenderer>();
        meshRenderer.material = new Material(Shader.Find("Standard"));
    }

    void OnDrawGizmos()
    {
        Gizmos.color = Color.green;

        Vector3[] vertices = new Vector3[6];
        for (int i = 0; i < 6; i++)
        {
            float angle = Mathf.Deg2Rad * (60 * i);
            vertices[i] = transform.position + new Vector3(Mathf.Cos(angle) * radius, Mathf.Sin(angle) * radius, 0);
        }

        // 绘制六边形边缘
        for (int i = 0; i < 6; i++)
        {
            Gizmos.DrawLine(vertices[i], vertices[(i + 1) % 6]);
            Handles.color = Color.red;
            Handles.Label(vertices[i], vertices[(i + 1) % 6].ToString());
        }
    }
}