贪吃蛇小项目

C#核心实践/贪吃蛇/Lesson2/BaseScene.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 贪吃蛇
+{
+    abstract class BaseScene : ISceneUpdate
+    {
+        protected int nowSceneIndex = 0;
+        protected string title;
+        protected string str1;
+
+        public abstract void PressEnter();
+        public void Update()
+        {
+            //要完成的内容：绘制开始和结束场景，并完成切换选择功能
+            Console.ForegroundColor = ConsoleColor.White;
+
+            //绘制标题
+            Console.SetCursorPosition(Game.w / 2 - title.Length, 5);
+            Console.Write(title);
+
+            //绘制选项
+            Console.SetCursorPosition(Game.w / 2 - str1.Length, 8);
+            Console.ForegroundColor = nowSceneIndex == 0 ? ConsoleColor.Red : ConsoleColor.White;
+            Console.Write(str1);
+
+            Console.SetCursorPosition(Game.w / 2 - 4, 10);
+            Console.ForegroundColor = nowSceneIndex == 1 ? ConsoleColor.Red : ConsoleColor.White;
+            Console.Write("结束游戏");
+            //根据nowSceneIndex绘制wsj选中的索引
+            switch (Console.ReadKey(true).Key)
+            {
+                case ConsoleKey.W:
+                    nowSceneIndex = 0;
+                    break;
+                case ConsoleKey.S:
+                    nowSceneIndex = 1;
+                    break;
+                case ConsoleKey.Enter:
+                    PressEnter();
+                    break;
+            }
+        }
+    }
+}

C#核心实践/贪吃蛇/Lesson2/BeginScene.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 贪吃蛇
+{
+    class BeginScene : BaseScene
+    {
+        public BeginScene()
+        {
+            title = "贪吃蛇小游戏";
+            str1 = "开始游戏";
+        }
+        public override void PressEnter()
+        {
+            //根据nowSceneIndex的值决定按下回车后做什么
+            if( nowSceneIndex == 0 )
+            {
+                //切换到开始游戏
+                Game.ChangeScene(E_Scene.Game);
+            }
+            else
+            {
+                //结束游戏
+                Environment.Exit(0);
+            }
+        }
+    }
+}

C#核心实践/贪吃蛇/Lesson2/EndScene.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 贪吃蛇
+{
+    class EndScene : BaseScene
+    {
+        public EndScene()
+        {
+            title = "游戏结束";
+            str1 = "重新开始";
+        }
+        public override void PressEnter()
+        {
+            //根据nowSceneIndex的值决定按下回车后做什么
+            if (nowSceneIndex == 0)
+            {
+                //切换到开始游戏
+                Game.ChangeScene(E_Scene.Begin);
+            }
+            else
+            {
+                //结束游戏
+                Environment.Exit(0);
+            }
+        }
+    }
+}

C#核心实践/贪吃蛇/Lesson2/GameScene.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace 贪吃蛇
+{
+    class GameScene : ISceneUpdate
+    {
+        Map map;
+        Snake snake;
+        Food food;
+        public GameScene()
+        {
+            map = new Map();
+            snake = new Snake(40, 10);
+            food = new Food(snake);
+        }
+        public void Update()
+        {
+            
+            map.Draw();//画地图
+            food.Draw();//画食物
+            snake.Move();//让蛇动起来
+            snake.Draw();//画蛇 
+            if (snake.CheckEnd(map))//检测游戏是否结束
+            {
+                Game.ChangeScene(E_Scene.End);
+            }
+            snake.CheckEat(food);//检测蛇是否吃到食物
+            Thread.Sleep(200);//控制蛇的移动速度
+            //检测用户输入
+            if (Console.KeyAvailable)//Console.KeyAvailable的作用是：如果有按键输入才返回Ture，防止卡住
+            {
+                switch (Console.ReadKey(true).Key)
+                {
+                    case ConsoleKey.W:
+                    case ConsoleKey.UpArrow:
+                        snake.ChangeDirection(E_MoveDirection.Up);
+                        //向上
+                        break;
+                    case ConsoleKey.S:
+                    case ConsoleKey.DownArrow:
+                        snake.ChangeDirection(E_MoveDirection.Down);
+                        //向下
+                        break;
+                    case ConsoleKey.A:
+                    case ConsoleKey.LeftArrow:
+                        snake.ChangeDirection(E_MoveDirection.Left);
+                        //向左
+                        break;
+                    case ConsoleKey.D:
+                    case ConsoleKey.RightArrow:
+                        snake.ChangeDirection(E_MoveDirection.Right);
+                        //向右
+                        break;
+                    default:
+                        break;
+                }
+            }
+            
+        }
+    }
+}