Game_CodeMM/Assets/00_scripts/MapScripts/MapBuildPlacer.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.UIElements;

public class MapBuildPlacer : MonoBehaviour
{
    [HideInInspector] public GameObject startPositionObject; // 坐标起始点
    [HideInInspector] public float cellSize = 2; // 单元格大小
    [HideInInspector] public Camera mainCamera;
    [HideInInspector] public MapListener mapListener;

    private Collider2D hit_oldest;
    private Color sprite_render_color;
    private readonly Color sprite_render_unable_color = new Color32(166, 73, 73, 255);
    private SpriteRenderer sprite_render_children;
    private MapBuildableCell snap_grid; // 吸附的格子
    private bool is_trigger_with_has_build = false;
    private bool isSnap = false;
    private GameObject render_container;
    private Vector2Int snap_grid_position_for_SO = Vector2Int.zero; // SO的坐标数据 , 不是世界坐标
    private Transform UIContainer;
    private LayerMask buildable_layer;
    private MapPlacerItem map_placer_item;

    private void Awake()
    {
        gameObject.AddComponent<Rigidbody2D>().isKinematic = true;
        map_placer_item = gameObject.GetComponent<MapPlacerItem>();
    }

    private void Start()
    {
        render_container = transform.Find("RenderContainer").gameObject;
        sprite_render_children = transform.Find("RenderContainer/RoomSpriteRender").GetComponent<SpriteRenderer>();
        UIContainer = transform.Find("RenderContainer/UI");
        sprite_render_color = sprite_render_children.color;
        foreach (Transform ui_child in UIContainer.transform)
        {
            ui_child.GetComponent<SpriteRenderer>().color = Color.green;
        }

        buildable_layer = 1 << LayerMask.NameToLayer("BuildableCell");
    }

    private void Update()
    {
        // render_container.SetActive(); // 设置吸附状态的响应
        self_move_with_mouse_with_ray();
    }

    // private void self__trigger_with_already_build(MapBuildableCell snap_grid)
    // {
    //     switch (buildRoomType)
    //     {
    //         case HomeMapSO.RoomType.CageRoom:
    //             Vector2Int snap_position_ = _self_get_snap_position();
    //             // is_trigger_with_has_build =
    //             // mapListener.m_send_SOMap_get_placeholder_area_has_room(snap_position_, buildRoomType);
    //             break;
    //         default:
    //             break;
    //     }
    //
    //     Vector2Int _self_get_snap_position() => snap_grid.m_recv_get_grid_position_with_vector2();
    // }

    // 跟随鼠标移动使用射线检测
    private void self_move_with_mouse_with_ray()
    {
        Vector3 mouse_world_position = mainCamera.ScreenToWorldPoint(Input.mousePosition);
        mouse_world_position.z = 0;
        RaycastHit2D hit = Physics2D.Raycast(
            origin: mouse_world_position,
            direction: Vector2.zero,
            distance: 0.1f,
            layerMask: buildable_layer);
        if (hit.collider) // 射线检测到格子, 吸附到格子坐标
        {
            if (hit.collider != hit_oldest) // 射线检测到的格子发生变化
            {
                snap_grid = hit.collider.GetComponent<MapBuildableCell>();
                hit_oldest = hit.collider;
            }

            mm_self_gameobject_snap_move();
        }
        else
        {
            mm_self_gameobject_free_move();
        }

        return;

        void mm_self_gameobject_snap_move() // 射线检测到格子, 吸附到格子坐标
        {
            Vector3 snap_grid_position = startPositionObject.transform.position +
                                         snap_grid.m_recv_get_grid_position_with_vector3() * cellSize;
            transform.position = snap_grid_position;
            isSnap = true;
            snap_grid_position_for_SO = snap_grid.m_recv_get_grid_position_with_vector2();
            is_trigger_with_has_build = mapListener.m_send_SOMap_trigger_placeholder_area_has_room(
                snap_grid_position_for_SO, map_placer_item
            );
            sprite_render_children.color = is_trigger_with_has_build ? sprite_render_unable_color : sprite_render_color; // 更改SR颜色 
        }

        void mm_self_gameobject_free_move() // 射线没有检测到格子, 自由移动
        {
            sprite_render_children.color = sprite_render_unable_color; // 更改sr为不可建造的颜色
            transform.position = mouse_world_position;
            isSnap = false;
            is_trigger_with_has_build = true;
            snap_grid_position_for_SO = Vector2Int.zero;
        }
    }

    public Vector2Int m_recv_placer_get_snap_grid_position_for_SO() => snap_grid_position_for_SO;

    public bool m_recv_placer_is_snap_to_grid() => isSnap;

    public bool m_recv_is_trigger_with_has_build() => is_trigger_with_has_build;

    // private void self_on_trigger_event(Collider2D other, bool status)
    // {
    //     // 检测是否与某个图层的碰撞器相交
    //     if (other.gameObject.layer == LayerMask.NameToLayer("AlreadyBuild"))
    //     {
    //         is_trigger_with_has_build = status;
    //     }
    // }


    // private void OnTriggerStay2D(Collider2D other)
    // {
    //     self_on_trigger_event(other, true);
    // }
    //
    // private void OnTriggerExit2D(Collider2D other)
    // {
    //     self_on_trigger_event(other, false);
    // }
}