贪吃蛇小项目

C#核心实践/贪吃蛇/Lesson3/GameObject.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 GameObject : IDraw
+    {
+        //当前位置
+        public Position pos; 
+
+        //绘制对象
+        //可以继承接口后，把接口中的方法变成抽象方法，让子类去实现
+        //因为时抽象行为，所以子类必须实现
+        public abstract void Draw();
+    }
+}

C#核心实践/贪吃蛇/Lesson3/IDraw.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
+{
+    interface IDraw
+    {
+        void Draw();
+    }
+}

C#核心实践/贪吃蛇/Lesson3/Position.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
+{
+    struct Position
+    {
+        public int x;
+        public int y;
+        public Position(int x, int y)
+        {
+            this.x = x;
+            this.y = y;
+        }
+        //重载==和!=运算符来判断两个Position是否相等
+        public static bool operator == (Position p1, Position p2)
+        {
+            return p1.x == p2.x && p1.y == p2.y;
+        }
+        public static bool operator !=(Position p1, Position p2)
+        {
+            return !(p1 == p2);
+        }
+    }
+}