XNA游戏开发之(一)——TargetElapsedTime设置Update方法刷新频率

【原创】Alex
自定义游戏屏幕刷新时间，默认情况下XNA开发框架的屏幕刷频率为60次。在默写时候，通常需要改变屏幕的刷新次数。可以通过Game类的TargetElapsedTime自定义设置即设置TargetElapsedTime间隔时间。

  1 using System;

  2 using System.Collections.Generic;

  3 using System.Linq;

  4 using Microsoft.Xna.Framework;

  5 using Microsoft.Xna.Framework.Audio;

  6 using Microsoft.Xna.Framework.Content;

  7 using Microsoft.Xna.Framework.GamerServices;

  8 using Microsoft.Xna.Framework.Graphics;

  9 using Microsoft.Xna.Framework.Input;

 10 using Microsoft.Xna.Framework.Media;

 11 using Microsoft.Xna.Framework.Net;

 12 using Microsoft.Xna.Framework.Storage;

 13 

 14 namespace Alex

 15 {

 16     /// <summary>

 17     /// This is the main type for your game

 18     /// </summary>

 19     public class AlexGame : Microsoft.Xna.Framework.Game

 20     {

 21         GraphicsDeviceManager graphics;

 22         SpriteBatch spriteBatch;
　　　　　　　//初始化记录次数0

 23         int updateCount = 0;

 24         public AlexGame()

 25         {

 26             graphics = new GraphicsDeviceManager(this);

 27             Content.RootDirectory = "Content";

 28         }

 29 

 30         /// <summary>

 31         /// Allows the game to perform any initialization it needs to before starting to run.

 32         /// This is where it can query for any required services and load any non-graphic

 33         /// related content.  Calling base.Initialize will enumerate through any components

 34         /// and initialize them as well.

 35         /// </summary>

 36         protected override void Initialize()

 37         {

 38             // TODO: Add your initialization logic here
　　　　　　　　  //每秒调用Update1500次

 39             this.TargetElapsedTime = TimeSpan.FromSeconds(1.0f / 1500.0f);

 40             

 41             base.Initialize();

 42         }

 43 

 44         /// <summary>

 45         /// LoadContent will be called once per game and is the place to load

 46         /// all of your content.

 47         /// </summary>

 48         protected override void LoadContent()

 49         {

 50             // Create a new SpriteBatch, which can be used to draw textures.

 51             spriteBatch = new SpriteBatch(GraphicsDevice);

 52 

 53             // TODO: use this.Content to load your game content here

 54         }

 55 

 56         /// <summary>

 57         /// UnloadContent will be called once per game and is the place to unload

 58         /// all content.

 59         /// </summary>

 60         protected override void UnloadContent()

 61         {

 62             // TODO: Unload any non ContentManager content here

 63         }

 64 

 65         /// <summary>

 66         /// Allows the game to run logic such as updating the world,

 67         /// checking for collisions, gathering input, and playing audio.

 68         /// </summary>

 69         /// <param name="gameTime">Provides a snapshot of timing values.</param>

 70         protected override void Update(GameTime gameTime)

 71         {

 72             // Allows the game to exit

 73             if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)

 74             {

 75                 this.Exit();

 76             }


　　　　　　　　  //每次调用加1

 81             updateCount=updateCount+1;
　　　　　　　　　//在游戏窗口标题显示

 82             this.Window.Title =updateCount.ToString();

 83 

 84             // TODO: Add your update logic here

 85 

 86             base.Update(gameTime);

 87         }

 88 

 89         /// <summary>

 90         /// This is called when the game should draw itself.

 91         /// </summary>

 92         /// <param name="gameTime">Provides a snapshot of timing values.</param>

 93         protected override void Draw(GameTime gameTime)

 94         {

 95             GraphicsDevice.Clear(Color.CornflowerBlue);

 96 

 97             // TODO: Add your drawing code here

 98 

 99             base.Draw(gameTime);

         }

     }

 }
 

运行如图：