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。

代码

  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);
100         }
101     }
102 }

运行如图：