经典游戏案例：unity官方推荐3d跑酷

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学习目标：实现跑酷核心算法

游戏画面

项目结构目录

部分核心代码

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// 游戏管理器是一个状态机，根据当前的游戏状态，它将在状态之间切换。
/// </summary>
public class GameManager : MonoBehaviour
{/// <summary>/// 单例模式/// </summary>public static GameManager instance { get { return s_Instance; } }protected static GameManager s_Instance;public AState[] states;//返回栈顶的游戏状态public AState topState { get { if (m_StateStack.Count == 0) return null; return m_StateStack[m_StateStack.Count - 1]; } }//消耗品数据库public ConsumableDatabase m_consumableDatabase;//游戏状态栈protected List<AState> m_StateStack = new List<AState>();//游戏状态字典protected Dictionary<string, AState> m_StateDict = new Dictionary<string, AState>();//函数执行顺序：awake onenable startprotected void OnEnable(){PlayerData.Create();s_Instance = this;m_consumableDatabase.Load();m_StateDict.Clear();if (states.Length == 0){return;}//初始化游戏状态字典for (int i = 0; i < states.Length; ++i){states[i].manager = this;m_StateDict.Add(states[i].GetName(), states[i]);}m_StateStack.Clear();PushState(states[0].GetName());}protected void Update(){if (m_StateStack.Count > 0){m_StateStack[m_StateStack.Count - 1].Tick();}}#region 游戏状态管理/// <summary>/// 游戏状态间的切换/// </summary>/// <param name="newState"></param>public void SwitchState(string newState){AState state = FindState(newState);if(state == null){Debug.LogError("Can't find the state named " + newState);return;}m_StateStack[m_StateStack.Count - 1].Exit(state);state.Enter(m_StateStack[m_StateStack.Count - 1]);m_StateStack.RemoveAt(m_StateStack.Count - 1);m_StateStack.Add(state);}/// <summary>/// 返回上一步游戏状态，并移除栈顶游戏状态/// </summary>public void PopState(){if (m_StateStack.Count < 2){Debug.LogError("Can't pop states, only one in stack.");return;}m_StateStack[m_StateStack.Count - 1].Exit(m_StateStack[m_StateStack.Count - 2]);m_StateStack[m_StateStack.Count - 2].Enter(m_StateStack[m_StateStack.Count - 2]);m_StateStack.RemoveAt(m_StateStack.Count - 1);}/// <summary>/// 进入新的游戏状态，并将其入栈/// </summary>/// <param name="name"></param>public void PushState(string name){AState state;if(!m_StateDict.TryGetValue(name,out state)){Debug.LogError("Can't find the state named " + name);return;}if (m_StateStack.Count > 0){m_StateStack[m_StateStack.Count - 1].Exit(state);state.Enter(m_StateStack[m_StateStack.Count - 1]);}else{state.Enter(null);}m_StateStack.Add(state);}/// <summary>/// 在字典中查找游戏状态/// </summary>/// <param name="statename"></param>/// <returns></returns>public AState FindState(string statename){AState state;if (!m_StateDict.TryGetValue(statename, out state)){return null;}else{return state;}}#endregion
}
/// <summary>
/// 游戏状态，用栈结构来存放
/// </summary>
public abstract class AState:MonoBehaviour
{[HideInInspector]public GameManager manager;/// <summary>/// 进入目标游戏状态前要执行的操作/// </summary>/// <param name="from">从哪个状态进入</param>public abstract void Enter(AState from);/// <summary>/// 离开目标游戏状态后要执行的操作/// </summary>/// <param name="to"></param>public abstract void Exit(AState to);/// <summary>/// 在目标游戏状态中要执行的操作/// </summary>public abstract void Tick();/// <summary>/// 获取游戏状态名（返回字符串）/// </summary>/// <returns></returns>public abstract string GetName();
}

下载链接：https://gitee.com/unity_demo/carzy-dash

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