从一个动作游戏中,去学习面向对象(接口,多态性及策略模式)

  2 
  3 {
  4 
  5     #region 武器接口和对每个武器的实现
  6 
  7     /// <summary>
  8 
  9     /// 武器攻击的通用接口
 10 
 11     /// </summary>
 12 
 13     internal interface IAttack
 14 
 15     {
 16 
 17         /// <summary>
 18 
 19         /// 攻击,参数是被攻击的对象
 20 
 21         /// </summary>
 22 
 23         /// <param name="monster"></param>
 24 
 25         void AttackTarget(Enemy enemy);
 26 
 27     }
 28 
 29  
 30 
 31     /// <summary>
 32 
 33     /// 武器-木剑
 34 
 35     /// </summary>
 36 
 37     internal sealed class WoodSword : IAttack
 38 
 39     {
 40 
 41         public void AttackTarget(Enemy enemy)
 42 
 43         {
 44 
 45             enemy.Notify(20);
 46 
 47         }
 48 
 49     }
 50 
 51  
 52 
 53     /// <summary>
 54 
 55     /// 武器-金属剑
 56 
 57     /// </summary>
 58 
 59     internal sealed class IronSword : IAttack
 60 
 61     {
 62 
 63         public void AttackTarget(Enemy enemy)
 64 
 65         {
 66 
 67             enemy.Notify(50);
 68 
 69         }
 70 
 71     }
 72 
 73     /// <summary>
 74 
 75     /// 武器-魔剑
 76 
 77     /// </summary>
 78 
 79     internal sealed class MagicSword : IAttack
 80 
 81     {
 82 
 83         private Random _random = new Random();
 84 
 85  
 86 
 87         public void AttackTarget(Enemy enemy)
 88 
 89         {
 90 
 91             Int32 loss = (_random.NextDouble() < 0.5) ? 100 : 200;
 92 
 93             if (200 == loss)
 94 
 95             {
 96 
 97                 Console.WriteLine("出现暴击！！！");
 98 
 99             }
100 
101             enemy.Notify(loss);
102 
103         }
104 
105     }
106 
107     #endregion
108 
109  
110 
111     #region 被攻击的对象,武器操作的对象
112 
113     /// <summary>
114 
115     /// 怪兽
116 
117     /// </summary>
118 
119     internal sealed class Enemy
120 
121     {
122 
123         ///　<summary>
124 
125         ///　怪物的名字
126 
127         ///　</summary>
128 
129         public String Name { get; set; }
130 
131  
132 
133         ///　<summary>
134 
135         ///　怪物的生命值
136 
137         ///　</summary>
138 
139         private Int32 HP { get; set; }
140 
141  
142 
143         public Enemy(String name, Int32 hp)
144 
145         {
146 
147             this.Name = name;
148 
149             this.HP = hp;
150 
151         }
152 
153  
154 
155         ///　<summary>
156 
157         ///　怪物被攻击时，被调用的方法，用来处理被攻击后的状态更改
158 
159         ///　</summary>
160 
161         ///　<param　name="loss">此次攻击损失的HP</param>
162 
163         public void Notify(Int32 loss)
164 
165         {
166 
167             if (this.HP <= 0)
168 
169             {
170 
171                 Console.WriteLine("此怪物已死");
172 
173                 return;
174 
175             }
176 
177  
178 
179             this.HP -= loss;
180 
181             if (this.HP <= 0)
182 
183             {
184 
185                 Console.WriteLine("怪物" + this.Name + "被打死");
186 
187             }
188 
189             else
190 
191             {
192 
193                 Console.WriteLine("怪物" + this.Name + "损失" + loss + "HP");
194 
195             }
196 
197         }
198 
199     }
200 
201     #endregion
202 
203  
204 
205     #region 游戏主人公,武器的发起者
206 
207     ///　<summary>
208 
209     ///　角色
210 
211     ///　</summary>
212 
213     internal sealed class Role
214 
215     {
216 
217         ///　<summary>
218 
219         ///　表示角色目前所持武器
220 
221         ///　</summary>
222 
223         public IAttack Weapon { get; set; }
224 
225  
226 
227         ///　<summary>
228 
229         ///　攻击怪物
230 
231         ///　</summary>
232 
233         ///　<param　name="monster">被攻击的怪物</param>
234 
235         public void Attack(Enemy enemy)
236 
237         {
238 
239             this.Weapon.AttackTarget(enemy);
240 
241         }
242 
243     }
244 
245     #endregion
246 
247  
248 
249 }

 1             #region 通过一个游戏学习设计模块
 2 
 3             Enemy enemy1 = new Enemy("小怪A", 50);
 4 
 5             Enemy enemy2 = new Enemy("小怪B", 50);
 6 
 7             Enemy enemy3 = new Enemy("关主", 200);
 8 
 9             Enemy enemy4 = new Enemy("最终Boss", 1000);
10 
11             Role role = new Role();
12 
13             role.Weapon = new WoodSword();
14 
15             role.Attack(enemy1);
16 
17             role.Attack(enemy1);
18 
19             role.Attack(enemy1);
20 
21             #endregion