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

    private void Start()
    {
        currentMapIndex = MapList.Count - 1;
        MapList[currentMapIndex].map.ShowMap();
        cameraBirdSec.detailLod = false;
        cameraBirdSec.currentDistance = MapList[currentMapIndex].cameraDistanceMax;
        SetCameraRange(cameraBirdSec.currentDistance);
    }

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

    private void OnCameraDistanceChange(float value)
    {
        if (currentMapIndex == 0)
        {
            if (value > MapList[currentMapIndex].cameraDistanceMax)
            {
                MapList[currentMapIndex+1].map.ShowMap();
                MapList[currentMapIndex].map.Hide();
                currentMapIndex++;

                cameraBirdSec.detailLod = false;
                cameraBirdSec.currentDistance = MapList[currentMapIndex].cameraDistanceMax;
                SetCameraRange(MapList[currentMapIndex].cameraDistanceMax);
                return;
            }
            SetCameraRange(value);
            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();
                }
            }
        }
        else
        {
            if (value>0)
            {
                MapList[currentMapIndex-1].map.ShowMap();
                MapList[currentMapIndex].map.Hide();
                currentMapIndex--;
                if (currentMapIndex == 0)
                {
                    cameraBirdSec.detailLod = true;
                }
            }
            else
            {
                if (currentMapIndex >= MapList.Count - 1)
                {
                    return;
                }
                MapList[currentMapIndex+1].map.ShowMap();
                MapList[currentMapIndex].map.Hide();
                currentMapIndex++;
            }
            cameraBirdSec.currentDistance = MapList[currentMapIndex].cameraDistanceMax;
            SetCameraRange(MapList[currentMapIndex].cameraDistanceMax);
        }
    }

    private void SetCameraRange(float cameraDistance)
    {
        var currentLayer = MapList[currentMapIndex];
        float distanceRange = (cameraDistance-currentLayer.cameraDistanceMin)/(currentLayer.cameraDistanceMax-currentLayer.cameraDistanceMin);
        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; 
        cameraBirdSec.SetRange(minX,maxX,minY,maxY);
    }
    
}

[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;
}