Unity-2D随机生成地图及障碍物（简易版）

最近在做的一个2D像素游戏 拾荒者 需要随机生成地图

这是地图效果图。
以下是生成地图及障碍物的代码。

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

/// 

/// PR_sc
/// 
public class MapManager : MonoBehaviour {
	//利用脚本生成地图。 10*10的像素地图

	public GameObject[] OutWallArray;
	public GameObject[] FloorArray;
	public GameObject[] WallArray;

	public int rows = 10;  //定义地图的行列。
	public int cols = 10;

	public int minCountWall = 2;
	public int maxCountWall = 8;

	private Transform mapHolder;
	private List positionList = new List();

	// Use this for initialization
	void Start () {
		InitMap();
	}
	
	// Update is called once per frame
	void Update () {
		
	}

	private void InitMap()
	{
		mapHolder = new GameObject("Map").transform;// 设置一个父类管理生成的地图
		for(int x = 0; x < cols; x++)
		{
			for(int y= 0; y < rows; y++)
			{
				if(x==0 ||y==0 || x == cols - 1 || y == rows - 1)//地图最外面一圈是围墙
				{
					int index = Random.Range(0, OutWallArray.Length);
					GameObject go = GameObject.Instantiate(OutWallArray[index], new Vector3(x, y, 0), Quaternion.identity) as GameObject;
					go.transform.SetParent(mapHolder);
				}
				else// 其余是地板
				{
					int index = Random.Range(0, FloorArray.Length);
					GameObject go = GameObject.Instantiate(FloorArray[index], new Vector3(x, y, 0), Quaternion.identity) as GameObject;
					go.transform.SetParent(mapHolder);
				}
			}
		}
		positionList.Clear();
		for (int x = 2; x < cols - 2; x++)
		{
			for(int y=2; y < rows - 2; y++)
			{
				positionList.Add(new Vector2(x, y));
			}
		}
		//创建障碍物 食物 敌人
		//创建障碍物
		int WallCount = Random.Range(minCountWall, maxCountWall + 1);//随机生成障碍物个数的范围
		for(int i = 0; i < WallCount; i++)
		{
			//随机取得位置
			int positionIndex = Random.Range(0, positionList.Count);
			Vector2 pos = positionList[positionIndex];
			positionList.RemoveAt(positionIndex);
			//随机取得障碍物
			int WallIndex = Random.Range(0, WallArray.Length);
			GameObject go = GameObject.Instantiate(WallArray[WallIndex], pos, Quaternion.identity) as GameObject;
			go.transform.SetParent(mapHolder);
		}
	}
}