手把手教用XNA开发winphone7游戏(四)

XNA Game Studio 游戏输入

昨天的双11让人感触颇多,幸好有http://winphone.us/和博客园还有技术陪伴我,还有很多园子里的朋友,大家一定不要放弃自己的梦想。

在这个环节,你将为游戏添加输入部分。对于windows Phone手机,他的输入主要是通过触摸板或者重力感应。由于Windows Phone模拟器不提供重力感应,我们提供了一个通过键盘来模拟重力感应的解决方案。这个只供模拟设备测试用,不能在真机上使用。

1.       添加 Microsoft.Device.Sensors 程序集的引用。

手把手教用XNA开发winphone7游戏(四)

1

Adding a reference to the Microsoft.Devices.Sensors assembly

Note:要添加引用,在解决方案资源管理器中的AlienGame项目下,右键点击References

 

2.       打开 GameplayScreen.cs (如果没有打开的话).

3.       添加如下命名申请:

(Code Snippet – Game Development with XNA – Gameplay Screen – more using statements)

C#

using Microsoft.Xna.Framework.Input;

using Microsoft.Xna.Framework.Input.Touch;

using Microsoft.Devices.Sensors;

 

4.       添加附加的类变量用以保存触摸和加速度计状态:

(Code Snippet – Game Development with XNA – Gameplay Screen – more class variables)

C#

//Input Members

AccelerometerReadingEventArgs accelState;

TouchCollection touchState;

Accelerometer Accelerometer;  

 

5.       在构造函数添加如下代码,初始化重力感应:

(Code Snippet – Game Development with XNA – Gameplay Screen – Accelerometer Initialization)

C#

Accelerometer = new Accelerometer();

if (Accelerometer.State == SensorState.Ready)

{

    Accelerometer.ReadingChanged += (s, e) =>

    {

        accelState = e;

    };

    Accelerometer.Start();

}

 

6.       创建 GameplayScreen 类中的"输入"区域:

C#

#region Input

#endregion

 

7.       在“Input”区域给基类的HandleInput方法添加一个override,此方法将读取当前用户的输入数据,并在之后根据游戏中变化作出响应。

Note: 在仿真设备中,鼠标点击将被认为是触摸或者键盘输入。但是使用真机的时候,键盘输入是不会发生的。

 

(Code Snippet – Game Development with XNA – Gameplan Screen – HandleInput method)

C#

/// <summary>

/// Input helper method provided by GameScreen. Packages up the various input

/// values for ease of use. Here it checks for pausing and handles controlling

/// the player's tank.

/// </summary>

/// <param name="input">The state of the gamepads</param>

public override void HandleInput(InputState input)

{

   if (input == null)

      throw new ArgumentNullException("input");

 

   if (input.PauseGame)

   {

      if (gameOver == true)

         finishCurrentGame();

   }

   else

   {

      touchState = TouchPanel.GetState();

      bool buttonTouched = false;

 

      //interpret touch screen presses

      foreach (TouchLocation location in touchState)

      {

         switch (location.State)

         {

            case TouchLocationState.Pressed:

               buttonTouched = true;

               break;

            case TouchLocationState.Moved:

               break;

            case TouchLocationState.Released:

               break;

         }

      }

 

    float movement = 0.0f;

    if (accelState != null)

    {

        if (Math.Abs(accelState.X) > 0.10f)

        {

            if (accelState.X > 0.0f)

                movement = 1.0f;

            else

                movement = -1.0f;

        }

    }

 

      //TODO: Update player Velocity over X axis #1

     

      //This section handles tank movement. We only allow one "movement" action

      //to occur at once so that touchpad devices don't get double hits.

      KeyboardState keyState = Keyboard.GetState();

 

      if (input.CurrentGamePadStates[0].DPad.Left ==     ButtonState.Pressed || keyState.IsKeyDown(Keys.Left))

      {

         //TODO: Update player velocity over X axis #2

 

      }

      else if (input.CurrentGamePadStates[0].DPad.Right ==  ButtonState.Pressed || keyState.IsKeyDown(Keys.Right))

      {

         //TODO: Update player velocity over X axis #3

 

      }

      else

      {

         //TODO: Update player velocity over X axis #4

 

      }

 

      // B button, or pressing on the upper half of the pad or space on keyboard or touching the touch panel fires the weapon.

      if (input.CurrentGamePadStates[0].IsButtonDown(Buttons.B) || input.CurrentGamePadStates[0].IsButtonDown(Buttons.A) || input.CurrentGamePadStates[0].ThumbSticks.Left.Y > 0.25f ||

keyState.IsKeyDown(Keys.Space) || buttonTouched)

      {

         if (!gameOver)

         {

            //TODO: Fire the bullet

 

         }

         else if (gameOver)

            finishCurrentGame();

 

      }

   }

}

 

8.       添加Helper方法来完成游戏:

(Code Snippet – Game Development with XNA – Gameplay Screen – finishCurrentGame method)

C#

private void finishCurrentGame()

{

   foreach (GameScreen screen in ScreenManager.GetScreens())

      screen.ExitScreen();

 

   ScreenManager.AddScreen(new BackgroundScreen());

   ScreenManager.AddScreen(new MainMenuScreen());

}

 

9.       编译应用程序。

 

在此部分的过程中,您创建一个游戏的输入处理子系统。 它将在创建游戏逻辑的下一个任务中使用。

 下一篇就是最后一篇了,你的游戏就要出现了:)

你可能感兴趣的:(one)