github傳送門：https://github.com/dongzizhu/unity3DLearning/tree/master/hw4/Disk

視頻傳送門：https://space.bilibili.com/472759319

打飛碟小游戲

這次的代碼架構同樣采用了MVC模式，與之前的牧師與魔鬼基本相同，這里就不重復敘述了，感興趣的可以看上上篇博文。

這里主要還是介紹一下firstController的變化以及新應用的工廠模式和真正負責飛碟移動的Emit類。

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using MyGame; using UnityEngine.SceneManagement;public class FirstController : MonoBehaviour, ISceneController, IUserAction {public ActionManager MyActionManager { get; set; }public DiskFactory factory { get; set; }public RecordController scoreRecorder;public UserGUI user; void Awake() {Director diretor = Director.getInstance();diretor.sceneCtrl = this; }// Use this for initializationvoid Start() {Begin();}// Update is called once per framevoid Update () {}public void Begin() {MyActionManager = gameObject.AddComponent<ActionManager>() as ActionManager;scoreRecorder = gameObject.AddComponent<RecordController>();user = gameObject.AddComponent<UserGUI>();user.Begin();}public void Hit(DiskController diskCtrl) { // 0=playing 1=lose 2=win 3=cooling if (user.game == 0) { Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);RaycastHit hit;if (Physics.Raycast(ray, out hit)) {//hit.collider.gameObject.SetActive(false);Debug.Log("Hit");factory.freeDisk(hit.collider.gameObject);hit.collider.gameObject.GetComponent<DiskController>().hit = true;scoreRecorder.add(hit.collider.gameObject.GetComponent<DiskController>());}}}public void PlayDisk() {MyActionManager.playDisk(user.round);}public void Restart() {SceneManager.LoadScene("scene");}public int Check() {return 0;} }

FirstController同樣是負責著所有其他的controller和userGUI，這都和之前相同；新加入的DiskFactory我們一會兒再介紹。這里主要講一下Hit函數。所謂ScreenPointToRay就是從Camera出發連接到鼠標點擊位置的一條射線，然后如果射線經過了我們目標的GameObject，就算是擊中了。當一個飛碟被擊中時，我們首先將這個Object的Active設為False，從而將擊中的消息傳回給Action；然后FreeDisk是將這個實例從放到free列表中等待下一次調用（其實在FreeDisk中我們已經有了設置Active的操作，這里將其注釋在這里是為了提醒我們它的重要性）。不知道free列表是什么東西沒關系，我們繼續看DiskFactory的代碼。

using System.Collections; using System.Collections.Generic; using UnityEngine; using MyGame;public class DiskFactory : MonoBehaviour {private static DiskFactory _instance;public FirstController sceneControler { get; set; }GameObject diskPrefab;public DiskController diskData;public List<GameObject> used;public List<GameObject> free;// Use this for initializationpublic static DiskFactory getInstance() {return _instance;}private void Awake() {if (_instance == null) {_instance = Singleton<DiskFactory>.Instance;_instance.used = new List<GameObject>();_instance.free = new List<GameObject>();diskPrefab = Instantiate(Resources.Load<GameObject>("Prefabs/disk"), new Vector3(40, 0, 0), Quaternion.identity);}}public void Start() {sceneControler = (FirstController)Director.getInstance().sceneCtrl;sceneControler.factory = _instance; }public GameObject getDisk(int round) { // 0=playing 1=lose 2=win 3=coolingif (sceneControler.scoreRecorder.Score >= round * 4) {if (sceneControler.user.round < 3) {sceneControler.user.round++;sceneControler.user.num = 0;sceneControler.scoreRecorder.Score = 0;}else {sceneControler.user.game = 2; // 贏了return null;}}else {if (sceneControler.user.num >= 10) {sceneControler.user.game = 1; // 輸了return null;} }GameObject newDisk;RoundController diskOfCurrentRound = new RoundController(sceneControler.user.round); if (free.Count == 0) {// if no free disk, then create a new disknewDisk = GameObject.Instantiate(diskPrefab) as GameObject;newDisk.AddComponent<ClickGUI>();diskData = newDisk.AddComponent<DiskController>();}else {// else let the first free disk be the newDisknewDisk = free[0];free.Remove(free[0]);newDisk.SetActive(true);}diskData = newDisk.GetComponent<DiskController>();diskData.color = diskOfCurrentRound.color;//Debug.Log(diskData);newDisk.transform.localScale = diskOfCurrentRound.scale * diskPrefab.transform.localScale;newDisk.GetComponent<Renderer>().material.color = diskData.color;used.Add(newDisk);return newDisk;}public void freeDisk(GameObject disk1) {used.Remove(disk1);disk1.SetActive(false);free.Add(disk1);return;}public void Restart() {used.Clear();free.Clear();} }

這就是所謂的工廠模式了。當游戲對象的創建與銷毀成本較高，且游戲涉及大量游戲對象的創建與銷毀時，必須考慮減少銷毀次數，比如這次的打飛碟游戲，或者像其他類型的射擊游戲，其中子彈或者中彈對象的創建與銷毀是很頻繁的。工廠模式將已經創建好正在使用的實例存在一個used列表中，然后當使用完成（被擊中）就將其放在free列表中，等待下一次調用；當我們需要一個新的實例的時候，首先檢查free列表，當其中沒有限制的實例時我們才創建一個新的。getDisk和freeDisk就實現了上面所敘述的邏輯，是核心的代碼。

最后是Emit類。

using System.Collections; using System.Collections.Generic; using UnityEngine; using MyGame;public class Emit : SSAction {public FirstController sceneControler = (FirstController)Director.getInstance().sceneCtrl;public Vector3 target; public float speed; private float distanceToTarget; float startX;float targetX;float targetY;public override void Start() {speed = sceneControler.user.round * 5;GameObject.GetComponent<DiskController>().speed = speed;startX = 6 - Random.value * 12;if (Random.value > 0.5) {targetX = 36 - Random.value * 36;targetY = 25 - Random.value * 25;}else {targetX = -36 + Random.value * 36;targetY = -25 + Random.value * 25;}this.Transform.position = new Vector3(startX, 0, 0);target = new Vector3(targetX, targetY, 30);//Debug.Log(target);distanceToTarget = Vector3.Distance(this.Transform.position, target);}public static Emit GetSSAction() {Emit action = ScriptableObject.CreateInstance<Emit>();return action;}public override void Update() {Vector3 targetPos = target;if(!GameObject.activeSelf){this.destroy = true;return;}//facing the targetGameObject.transform.LookAt(targetPos);//calculate the starting angel float angle = Mathf.Min(1, Vector3.Distance(GameObject.transform.position, targetPos) / distanceToTarget) * 45;GameObject.transform.rotation = GameObject.transform.rotation * Quaternion.Euler(Mathf.Clamp(-angle, -42, 42), 0, 0);float currentDist = Vector3.Distance(GameObject.transform.position, target);//Debug.Log("****************************");//Debug.Log(startX);//Debug.Log(target);//Debug.Log("****************************");GameObject.transform.Translate(Vector3.forward * Mathf.Min(speed * Time.deltaTime, currentDist));if (this.Transform.position == target) {sceneControler.scoreRecorder.miss();Debug.Log("here in miss!!");GameObject.SetActive(false);GameObject.transform.position = new Vector3(startX, 0, 0);sceneControler.factory.freeDisk(GameObject);this.destroy = true;this.Callback.ActionDone(this);}} }

我們在Start函數中保證了飛碟出現的位置和目標方向的隨機性。然后在Update函數中首先計算移動的角度，然后根據速度給出當前的位移，然后進行一次判斷，如果當前位置已經是終點了，那么我們首先setActive告訴外層的actionManager之前的運動可以取消了，然后將當前的實例free掉。在Update函數開始返回前也需要設置一下destroy是為了在hit后也可以告訴actionManager取消當前運動，與后面那個并不是重復操作。

最后我們來看一眼actionControl的核心ActionMananger，其他的就不全部貼上來了。

public class ActionManager : SSActionManager {public FirstController sceneController;public DiskFactory diskFactory;public RecordController scoreRecorder;public Emit EmitDisk;public GameObject Disk;int count = 0;protected void Start() {sceneController = (FirstController)Director.getInstance().sceneCtrl;diskFactory = sceneController.factory;scoreRecorder = sceneController.scoreRecorder;sceneController.MyActionManager = this;}protected new void Update() {if (sceneController.user.round <= 3 && sceneController.user.game == 0) {count++;if (count == 60 * sceneController.user.round) {playDisk(sceneController.user.round);sceneController.user.num++;count = 0;}base.Update();}}public void playDisk(int round) {EmitDisk = Emit.GetSSAction();Disk = diskFactory.getDisk(round);this.AddAction(Disk, EmitDisk, this);Disk.GetComponent<DiskController>().action = EmitDisk;}}

Update實現了每60幀*round后發出一個飛碟。之所以這樣設計是因為最后一輪的飛碟速度太快，這樣能夠適當降低游戲難度。playDisk函數就是從工廠中獲取一個飛碟，然后和下一個應該出現的飛碟的移動方向和特征一起傳給AcitionManager。

另外為了有空戰的感覺，我還加入了在AssetStore下載的StarField天空盒，最終的效果如下圖所示。

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