MazeMakerGrow.cs

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

public class MazeMakerGrow : MonoBehaviour {

    public bool growOnStart = false;
    public int xMax = 11;
    public int yMax = 11;
    public int zMax = 11;
    public GameObject roadObject;
    public GameObject preRoadObject = null;

    private GameObject mMazeBase;

    private bool makeMazeComplete = false;

    private bool isActive = false;

    public delegate void MazeMakerEventHandler(object sender);
    public event MazeMakerEventHandler MakeComplete;

    // Use this for initialization
    void Start ()
    {
        if ( growOnStart )
        {
            Grow();
        }
    }
    
    public void Grow()
    {
        isActive = true;
    }

    // Update is called once per frame
    void Update () {
		if( isActive)
        {
            isActive = false;
            
            // 進行可能な方向を得る
            Vector3 direction = GetGoDirection();

            if (direction == Vector3.zero)
            {
                GoBack();
            }
            else
            {
                // 進行可能な方向に2セル進む
                GoAhead(direction);
            }
        }
	}

    Vector3 GetGoDirection()
    {
        Vector3 result = Vector3.zero;

        List<Ray> rayList = new List<Ray>();
        Ray ray;
        RaycastHit hit;
        float distance = 2.0f;
        float radious = 1.0f;

        ray = new Ray(transform.position, this.transform.forward);
        if( !Physics.SphereCast(ray, radious, out hit, distance) )
        {
            rayList.Add(ray);
        }
        ray = new Ray(transform.position, -this.transform.forward);
        if (!Physics.SphereCast(ray, radious, out hit, distance))
        {
            rayList.Add(ray);
        }
        ray = new Ray(transform.position, this.transform.right);
        if (!Physics.SphereCast(ray, radious, out hit, distance))
        {
            rayList.Add(ray);
        }
        ray = new Ray(transform.position, -this.transform.right);
        if (!Physics.SphereCast(ray, radious, out hit, distance))
        {
            rayList.Add(ray);
        }
        ray = new Ray(transform.position, this.transform.up);
        if (!Physics.SphereCast(ray, radious, out hit, distance))
        {
            rayList.Add(ray);
        }
        ray = new Ray(transform.position, -this.transform.up);
        if (!Physics.SphereCast(ray, radious, out hit, distance))
        {
            rayList.Add(ray);
        }

        if( rayList.Count > 0 )
        {
            int randIndex = Random.Range(0, rayList.Count);
            result = rayList[randIndex].direction;
        }
        Debug.Log(result);
        return result;
    }

    bool isStart()
    {
        if( preRoadObject == null )
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    void GoBack()
    {
        Debug.Log("GoBack:in");
        // 進行方向が見つからない場合
        // 2セル戻る
        // スタート地点なら生成終了
        if (isStart())
        {
            Debug.Log("Maze Generate Complete!");
            makeMazeComplete = true;
            // 完了通知
//            OnMakeComplete();
            return;
        }
        else
        {
            // 戻る
            if( preRoadObject!= null )
            {
                preRoadObject.GetComponent<MazeMakerGrow>().Grow();
            }
        }
    }

    void GoAhead( Vector3 direction )
    {
        GameObject copySpaceCube1 = Object.Instantiate(roadObject) as GameObject;
        copySpaceCube1.transform.position = this.transform.position + direction * 1.0f;

        Destroy(copySpaceCube1.GetComponent<MazeMakerGrow>());

        GameObject copySpaceCube2 = Object.Instantiate(roadObject) as GameObject;
        copySpaceCube2.transform.position = this.transform.position + direction * 2.0f;

        copySpaceCube2.GetComponent<MazeMakerGrow>().preRoadObject = this.gameObject;
        copySpaceCube2.GetComponent<MazeMakerGrow>().Grow();
    }

    /* 迷路生成完了通知 */
    public virtual void OnMakeComplete()
    {
        if (MakeComplete != null)
        {
            MakeComplete(this);
        }
    }
}