WaterFlush/Assets/MapLodCtrl.cs

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

public class MapLodCtrl : MonoBehaviour
{
    public CameraBirdSec cameraBirdSec;

    public List<LodLayer> MapList = new List<LodLayer>();
    public int currentMapIndex = 2;

    public List<LodStayLayer> MapStayList = new List<LodStayLayer>();
    
    private void Awake()
    {
        cameraBirdSec.OnDistanceChange += OnCameraDistanceChange;
    }

    private void Start()
    {
        MapList[currentMapIndex].map.ShowMap();
    }

    private void OnDestroy()
    {
        cameraBirdSec.OnDistanceChange -= OnCameraDistanceChange;
    }

    private void OnCameraDistanceChange(float value)
    {
        if (currentMapIndex>0&&value < MapList[currentMapIndex].cameraDistanceMin)
        {
            MapList[currentMapIndex-1].map.ShowMap();
            MapList[currentMapIndex].map.Hide();
            currentMapIndex--;
        }
        if (currentMapIndex < MapList.Count - 1 && value > MapList[currentMapIndex].cameraDistanceMax)
        {
            MapList[currentMapIndex+1].map.ShowMap();
            MapList[currentMapIndex].map.Hide();
            currentMapIndex++;
        }

        var currentLayer = MapList[currentMapIndex];
        
        float distanceRange = (value-currentLayer.cameraDistanceMin)/(currentLayer.cameraDistanceMax-currentLayer.cameraDistanceMin);//27-3
        
        float minX =currentLayer.min_X_Range.x+Mathf.Abs(currentLayer.min_X_Range.x-currentLayer.max_X_Range.x)*distanceRange; 
        float maxX =currentLayer.min_X_Range.y-Mathf.Abs(currentLayer.min_X_Range.y-currentLayer.max_X_Range.y)*distanceRange; 
        float minY =currentLayer.min_Y_Range.y+Mathf.Abs(currentLayer.min_Y_Range.y-currentLayer.max_Y_Range.y)*distanceRange; 
        float maxY =currentLayer.min_Y_Range.x-Mathf.Abs(currentLayer.min_Y_Range.x-currentLayer.max_Y_Range.x)*distanceRange; 
        
//        Debug.Log($"dis:{value} disRange:{distanceRange} minX:{minX} maxX:{maxX} minY:{minY} maxY:{maxY}");
        cameraBirdSec.SetRange(minX,maxX,minY,maxY);
        for (int i = 0; i < MapStayList.Count; i++)
        {
            if (value >= MapStayList[i].cameraDistanceMin && value < MapStayList[i].cameraDistanceMax)
            {
                MapStayList[i].map.ShowMap();
            }
            else
            {
                MapStayList[i].map.Hide();
            }
        }
    }
}


[Serializable]
public class LodLayer
{
    public MapGenerator map;
    public float cameraDistanceMin;
    public float cameraDistanceMax;
    public Vector2 min_X_Range;//最短距离时候的X范围
    public Vector2 max_X_Range;//最大距离时候的X范围
    public Vector2 min_Y_Range;
    public Vector2 max_Y_Range;
}

[Serializable]
public class LodStayLayer
{
    public MapGenerator map;
    public float cameraDistanceMin;
    public float cameraDistanceMax;
}