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游戲人生Silverlight：星際競(jìng)技場(chǎng)

作者：webabcd
開發(fā) 后端
使用 Silverlight 2.0(c#, Farseer Physics Engine) 開發(fā)一個(gè)射擊游戲：星際競(jìng)技場(chǎng)。思路：使用一個(gè)開源的 Silverlight 物理引擎：Farseer Physics Engine.....

介紹

使用 Silverlight 2.0(c#, Farseer Physics Engine) 開發(fā)一個(gè)射擊游戲：星際競(jìng)技場(chǎng)

玩法

W 或者 ↑ = 前進(jìn)；S 或者 ↓ = 后退：A 或者 ← = 左轉(zhuǎn)；D 或者 → = 右轉(zhuǎn)；J 或者 Ctrl = 開火

思路

1、使用一個(gè)開源的 Silverlight 物理引擎：Farseer Physics Engine

2、將 Farseer Physics Engine 中的物理運(yùn)算器 PhysicsSimulator 放到一個(gè)全局變量中，對(duì) Body 和 Geom 做即時(shí)運(yùn)算，

3、寫個(gè) IPhysicsControl 接口，用于描述物理對(duì)象的各個(gè)屬性，需要運(yùn)動(dòng)和碰撞的對(duì)象，要實(shí)現(xiàn)該接口抽象出來的各個(gè)屬性

4、寫個(gè)抽象類（Sprite），在其內(nèi)封裝好物理引擎。各種類型的物理對(duì)象的模擬器，都需要重寫該抽象類的兩個(gè)方法GetForce()和GetTorque()即可，其分別要返回對(duì)象在當(dāng)前時(shí)刻所受到的牽引力和力矩

5、寫個(gè) IFire 接口，所有可開火的對(duì)象都要實(shí)現(xiàn)該接口

6、寫個(gè)控件 PhysicsBox，用于包裝 IPhysicsControl，從而將模擬器計(jì)算出的運(yùn)動(dòng)和碰撞結(jié)果呈現(xiàn)到界面上

關(guān)鍵代碼Sprite.cs（Sprite 模擬器的基類）

  1. using System;  
  2. using System.Net;  
  3. using System.Windows;  
  4. using System.Windows.Controls;  
  5. using System.Windows.Documents;  
  6. using System.Windows.Ink;  
  7. using System.Windows.Input;  
  8. using System.Windows.Media;  
  9. using System.Windows.Media.Animation;  
  10. using System.Windows.Shapes;  
  11.  
  12. using FarseerGames.FarseerPhysics;  
  13. using FarseerGames.FarseerPhysics.Mathematics;  
  14. using FarseerGames.FarseerPhysics.Dynamics;  
  15. using FarseerGames.FarseerPhysics.Collisions;  
  16.  
  17. namespace YYArena.Core  
  18. {  
  19.     /**//// <summary> 
  20.     /// Sprite 基類  
  21.     /// </summary> 
  22.     public abstract class Sprite  
  23.     {  
  24.         private PhysicsSimulator _physicsSimulator;  
  25.  
  26.         protected PhysicsBox playerBox;  
  27.         protected Geom playerGeometry;  
  28.  
  29.         /**//// <summary> 
  30.         /// 構(gòu)造函數(shù)  
  31.         /// </summary> 
  32.         /// <param name="physicsSimulator">PhysicsSimulator</param> 
  33.         /// <param name="physicsControl">IPhysicsControl</param> 
  34.         /// <param name="position">初始位置</param> 
  35.         /// <param name="angle">初始轉(zhuǎn)角</param> 
  36.         /// <param name="originalVelocity">初始速度</param> 
  37.         public Sprite(PhysicsSimulator physicsSimulator,  
  38.             IPhysicsControl physicsControl, Vector2 position, float angle, float originalVelocity)  
  39.         {  
  40.             _physicsSimulator = physicsSimulator;  
  41.  
  42.             playerBox = new PhysicsBox(physicsControl);  
  43.             playerBox.Body.Position = position;  
  44.             playerBox.Body.Rotation = (float)Helper.Angle2Radian(angle);  
  45.             playerBox.Body.LinearVelocity = Helper.Convert2Vector(originalVelocity, (float)Helper.Angle2Radian(angle));  
  46.  
  47.             // Body 和 Geom 的 Tag 保存為 Sprite，方便引用  
  48.             playerBox.Body.Tag = this;  
  49.             playerBox.Geom.Tag = this;  
  50.  
  51.             playerBox.Update();  
  52.         }  
  53.  
  54.         /**//// <summary> 
  55.         /// 即時(shí)計(jì)算力和力矩  
  56.         /// </summary> 
  57.         void CompositionTarget_Rendering(object sender, EventArgs e)  
  58.         {  
  59.             if (Enabled)  
  60.             {  
  61.                 var force = GetForce();  
  62.                 var torque = GetTorque();  
  63.  
  64.                 playerBox.Body.ApplyForce(force);  
  65.                 playerBox.Body.ApplyTorque(torque);  
  66.  
  67.                 playerBox.Update();  
  68.             }  
  69.         }  
  70.  
  71.         /**//// <summary> 
  72.         /// 返回 Sprite 當(dāng)前受的力  
  73.         /// </summary> 
  74.         protected abstract Vector2 GetForce();  
  75.         /**//// <summary> 
  76.         /// 返回 Sprite 當(dāng)前受的力矩  
  77.         /// </summary> 
  78.         protected abstract float GetTorque();  
  79.  
  80.         public PhysicsBox PhysicsBox  
  81.         {  
  82.             get { return playerBox; }  
  83.         }  
  84.  
  85.         private bool _enabled = false;  
  86.         /**//// <summary> 
  87.         /// 是否啟用此 Sprite  
  88.         /// </summary> 
  89.         public bool Enabled  
  90.         {  
  91.             get { return _enabled; }  
  92.             set  
  93.             {   
  94.                 _enabled = value;  
  95.  
  96.                 if (value)  
  97.                 {  
  98.                     CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);  
  99.  
  100.                     _physicsSimulator.Add(playerBox.Body);  
  101.                     _physicsSimulator.Add(playerBox.Geom);  
  102.                 }  
  103.                 else  
  104.                 {  
  105.                     CompositionTarget.Rendering -= new EventHandler(CompositionTarget_Rendering);  
  106.  
  107.                     GC.SuppressFinalize(this);  
  108.                     _physicsSimulator.Remove(playerBox.Body);  
  109.                     _physicsSimulator.Remove(playerBox.Geom);  
  110.                 }  
  111.             }  
  112.         }  
  113.     }  
  114. } 

#p#

PlayerSprite.cs（玩家 Sprite 模擬器）

  1. using System;  
  2. using System.Net;  
  3. using System.Windows;  
  4. using System.Windows.Controls;  
  5. using System.Windows.Documents;  
  6. using System.Windows.Ink;  
  7. using System.Windows.Input;  
  8. using System.Windows.Media;  
  9. using System.Windows.Media.Animation;  
  10. using System.Windows.Shapes;  
  11.  
  12. using System.Collections.Generic;  
  13. using FarseerGames.FarseerPhysics.Mathematics;  
  14. using FarseerGames.FarseerPhysics;  
  15. using FarseerGames.FarseerPhysics.Collisions;  
  16.  
  17. namespace YYArena.Core  
  18. {  
  19.     /**//// <summary> 
  20.     /// 玩家 Sprite  
  21.     /// </summary> 
  22.     public class PlayerSprite : Sprite, IFire  
  23.     {  
  24.         private List<Key> _upKeys { get; set; }  
  25.         private List<Key> _downKeys { get; set; }  
  26.         private List<Key> _leftKeys { get; set; }  
  27.         private List<Key> _rightKeys { get; set; }  
  28.         private List<Key> _fireKeys { get; set; }  
  29.  
  30.         private KeyboardHandler _keyHandler;  
  31.         private IPhysicsControl _physicsControl;  
  32.  
  33.         /**//// <summary> 
  34.         /// 構(gòu)造函數(shù)  
  35.         /// </summary> 
  36.         /// <param name="physicsSimulator">PhysicsSimulator</param> 
  37.         /// <param name="physicsControl">IPhysicsControl</param> 
  38.         /// <param name="position">初始位置</param> 
  39.         /// <param name="angle">初始轉(zhuǎn)角</param> 
  40.         /// <param name="originalVelocity">初始速度</param> 
  41.         /// <param name="keyboardHandler">KeyboardHandler</param> 
  42.         /// <param name="up">操作玩家向前移動(dòng)的按鍵集合</param> 
  43.         /// <param name="down">操作玩家向后移動(dòng)的按鍵集合</param> 
  44.         /// <param name="left">操作玩家向左轉(zhuǎn)動(dòng)的按鍵集合</param> 
  45.         /// <param name="right">操作玩家向右轉(zhuǎn)動(dòng)的按鍵集合</param> 
  46.         /// <param name="fire">操作玩家開火的按鍵集合</param> 
  47.         public PlayerSprite(PhysicsSimulator physicsSimulator,  
  48.             IPhysicsControl physicsControl, Vector2 position, float angle, float originalVelocity,  
  49.             KeyboardHandler keyboardHandler,  
  50.             List<Key> up, List<Key> down, List<Key> left, List<Key> right, List<Key> fire)  
  51.             : base(physicsSimulator, physicsControl, position, angle, originalVelocity)  
  52.         {  
  53.             PrevFireDateTime = DateTime.MinValue;  
  54.             MinFireInterval = 500d;  
  55.  
  56.             _upKeys = up;  
  57.             _downKeys = down;  
  58.             _leftKeys = left;  
  59.             _rightKeys = right;  
  60.             _fireKeys = fire;  
  61.  
  62.             _keyHandler = keyboardHandler;  
  63.             _physicsControl = physicsControl;  
  64.  
  65.             CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);  
  66.         }  
  67.  
  68.         void CompositionTarget_Rendering(object sender, EventArgs e)  
  69.         {  
  70.             if (Enabled)  
  71.             {  
  72.                 // 如果按了開火鍵，是否可開火  
  73.                 if (_keyHandler.AnyKeyPressed(_fireKeys) && (DateTime.Now - PrevFireDateTime).TotalMilliseconds > MinFireInterval)  
  74.                 {  
  75.                     PrevFireDateTime = DateTime.Now;  
  76.                     if (Fire != null)  
  77.                         Fire(this, EventArgs.Empty);  
  78.                 }  
  79.             }  
  80.         }  
  81.  
  82.         public DateTime PrevFireDateTime { get; set; }  
  83.  
  84.         public double MinFireInterval { get; set; }  
  85.  
  86.         public event EventHandler<EventArgs> Fire;  
  87.  
  88.         protected override Vector2 GetForce()  
  89.         {  
  90.             Vector2 force = Vector2.Zero;  
  91.  
  92.             if (_keyHandler.AnyKeyPressed(_upKeys))  
  93.                 force += Helper.Convert2Vector(_physicsControl.ForceAmount, playerBox.Body.Rotation);  
  94.             if (_keyHandler.AnyKeyPressed(_downKeys))  
  95.                 force += Helper.Convert2Vector(_physicsControl.ForceAmount, playerBox.Body.Rotation - Helper.Angle2Radian(180));  
  96.  
  97.             // 最大線性速度限制  
  98.             if (playerBox.Body.LinearVelocity.Length() > _physicsControl.MaxLinearVelocity)  
  99.                 force = Vector2.Zero;  
  100.  
  101.             return force;  
  102.         }  
  103.  
  104.         protected override float GetTorque()  
  105.         {  
  106.             float torque = 0;  
  107.  
  108.             if (_keyHandler.AnyKeyPressed(_leftKeys))  
  109.                 torque -= _physicsControl.TorqueAmount;  
  110.             if (_keyHandler.AnyKeyPressed(_rightKeys))  
  111.                 torque += _physicsControl.TorqueAmount;  
  112.  
  113.             // 用于修正 RotationalDragCoefficient （在沒有任何 Torque 的情況下，如果轉(zhuǎn)速小于 1.3 則設(shè)其為 0）  
  114.             // 如果不做此修正的話，轉(zhuǎn)速小于 1.3 后還會(huì)轉(zhuǎn)好長(zhǎng)時(shí)間  
  115.             if (!_keyHandler.AnyKeyPressed(_leftKeys) && !_keyHandler.AnyKeyPressed(_rightKeys) && Math.Abs(playerBox.Body.AngularVelocity) < 1.3)  
  116.                 playerBox.Body.AngularVelocity = 0;  
  117.  
  118.             // 最大轉(zhuǎn)速限制  
  119.             if (Math.Abs(playerBox.Body.AngularVelocity) > _physicsControl.MaxAngularVelocity)  
  120.                 torque = 0;  
  121.  
  122.             return torque;  
  123.         }  
  124.     }  
  125. } 

#p#

AISprite.cs（敵軍 Sprite 模擬器）

  1. using System;  
  2. using System.Net;  
  3. using System.Windows;  
  4. using System.Windows.Controls;  
  5. using System.Windows.Documents;  
  6. using System.Windows.Ink;  
  7. using System.Windows.Input;  
  8. using System.Windows.Media;  
  9. using System.Windows.Media.Animation;  
  10. using System.Windows.Shapes;  
  11.  
  12. using System.Collections.Generic;  
  13. using FarseerGames.FarseerPhysics.Mathematics;  
  14.  
  15. using FarseerGames.FarseerPhysics;  
  16. using FarseerGames.FarseerPhysics.Collisions;  
  17. using FarseerGames.FarseerPhysics.Dynamics;  
  18.  
  19. namespace YYArena.Core  
  20. {  
  21.     /**//// <summary> 
  22.     /// 敵軍 Sprite  
  23.     /// </summary> 
  24.     public class AISprite : Sprite, IFire  
  25.     {  
  26.         private Sprite _attackTarget;  
  27.         private int _aiLevel;  
  28.         private IPhysicsControl _physicsControl;  
  29.  
  30.         /**//// <summary> 
  31.         /// 構(gòu)造函數(shù)  
  32.         /// </summary> 
  33.         /// <param name="physicsSimulator">PhysicsSimulator</param> 
  34.         /// <param name="physicsControl">IPhysicsControl</param> 
  35.         /// <param name="position">初始位置</param> 
  36.         /// <param name="angle">初始轉(zhuǎn)角</param> 
  37.         /// <param name="originalVelocity">初始速度</param> 
  38.         /// <param name="attackTarget">攻擊目標(biāo)</param> 
  39.         /// <param name="aiLevel">ai等級(jí)</param> 
  40.         public AISprite(PhysicsSimulator physicsSimulator,  
  41.             IPhysicsControl physicsControl, Vector2 position, float angle, float originalVelocity, Sprite attackTarget, int aiLevel)  
  42.             : base(physicsSimulator, physicsControl, position, angle, originalVelocity)  
  43.         {  
  44.             // 上次開火時(shí)間  
  45.             PrevFireDateTime = DateTime.Now.AddSeconds(3);  
  46.             // 最小開火間隔  
  47.             MinFireInterval = 3000d;  
  48.  
  49.             _attackTarget = attackTarget;  
  50.             _aiLevel = aiLevel;  
  51.             _physicsControl = physicsControl;  
  52.  
  53.             InitAI();  
  54.  
  55.             CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);  
  56.         }  
  57.  
  58.         private void InitAI()  
  59.         {  
  60.             // 根據(jù) ai 等級(jí)設(shè)置最小開火間隔  
  61.             double fireCoefficient = 1 + 30 / _aiLevel;  
  62.             MinFireInterval = Helper.GenerateRandom((int)MinFireInterval, (int)(fireCoefficient * MinFireInterval));  
  63.         }  
  64.  
  65.         void CompositionTarget_Rendering(object sender, EventArgs e)  
  66.         {  
  67.             if (Enabled && AttackTarget.Enabled)  
  68.             {  
  69.                 // 是否開火  
  70.                 if ((DateTime.Now - PrevFireDateTime).TotalMilliseconds > MinFireInterval)  
  71.                 {  
  72.                     PrevFireDateTime = DateTime.Now;  
  73.  
  74.                     if (Fire != null)  
  75.                         Fire(this, EventArgs.Empty);  
  76.                 }  
  77.             }  
  78.         }  
  79.  
  80.         public DateTime PrevFireDateTime { get; set; }  
  81.  
  82.         public double MinFireInterval { get; set; }  
  83.  
  84.         public event EventHandler<EventArgs> Fire;  
  85.  
  86.  
  87.         public Sprite AttackTarget  
  88.         {  
  89.             get { return _attackTarget; }  
  90.             set { _attackTarget = value; }  
  91.         }  
  92.  
  93.         protected override Vector2 GetForce()  
  94.         {  
  95.             Vector2 force = Vector2.Zero;  
  96.  
  97.             if (!_attackTarget.Enabled)  
  98.                 return force;  
  99.  
  100.             force += Helper.Convert2Vector(_physicsControl.ForceAmount, playerBox.Body.Rotation);  
  101.  
  102.             // 根據(jù) ai 等級(jí)做最大線性速度限制  
  103.             if (playerBox.Body.LinearVelocity.Length() > _physicsControl.MaxLinearVelocity * Helper.GenerateRandom(50, 200) / 1000)  
  104.                 force = Vector2.Zero;  
  105.  
  106.             return force;  
  107.         }  
  108.  
  109.         protected override float GetTorque()  
  110.         {  
  111.             float torque = 0f;  
  112.  
  113.             if (!_attackTarget.Enabled)  
  114.                 return torque;  
  115.  
  116.             // 按某個(gè)方向旋轉(zhuǎn)，原則是以最小的旋轉(zhuǎn)角度對(duì)準(zhǔn)目標(biāo)  
  117.             Vector2 relativePosition = _attackTarget.PhysicsBox.Body.Position - playerBox.Body.Position;  
  118.             double targetRotation = Helper.Convert2Rotation(relativePosition);  
  119.             double currentRotation = playerBox.Body.Rotation;  
  120.             double relativeAngle = Helper.Radian2Angle(targetRotation - currentRotation);  
  121.             if (relativeAngle < 0)  
  122.                 relativeAngle += 360;  
  123.  
  124.             if (relativeAngle > 1)  
  125.             {  
  126.                 if (relativeAngle < 180 && relativeAngle > 0)  
  127.                     torque += _physicsControl.TorqueAmount;  
  128.                 else if (relativeAngle > 180 && relativeAngle < 360)  
  129.                     torque -= _physicsControl.TorqueAmount;  
  130.             }  
  131.             else  
  132.             {  
  133.                 playerBox.Body.AngularVelocity = 0;  
  134.             }  
  135.  
  136.  
  137.             // 最大轉(zhuǎn)速限制  
  138.             if (Math.Abs(playerBox.Body.AngularVelocity) > _physicsControl.MaxAngularVelocity)  
  139.                 torque = 0;  
  140.              
  141.             return torque;  
  142.         }  
  143.     }  
  144. } 

[源碼下載]

原文鏈接：http://www.cnblogs.com/webabcd/archive/2009/06/22/1508042.html

責(zé)任編輯：張偉 來源： webabcd的博客
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