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
12
13 namespace start
14 {
15     //摄像机的视图和投影矩阵
16     /// <summary>
17     /// This is a game component that implements IUpdateable.
18     /// </summary>
19     public class Camera : Microsoft.Xna.Framework.GameComponent
20     {
21         //摄像机的视图和投影矩阵
22         public Matrix view { get; protected set; }
23         public Matrix projection { get; protected set; }
24         public Camera(Game game,Vector3 pos,Vector3 target,Vector3 up)
25             : base(game)
26         {
27             view = Matrix.CreateLookAt(pos,target,up);
28             projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4,(float)Game.Window.ClientBounds.Width/(float)Game.Window.ClientBounds.Height,1,100);
29             // TODO: Construct any child components here
30         }
31
32         /// <summary>
33         /// Allows the game component to perform any initialization it needs to before starting
34         /// to run.  This is where it can query for any required services and load content.
35         /// </summary>
36         public override void Initialize()
37         {
38             // TODO: Add your initialization code here
39
40             base.Initialize();
41         }
42
43         /// <summary>
44         /// Allows the game component to update itself.
45         /// </summary>
46         /// <param name="gameTime">Provides a snapshot of timing values.</param>
47         public override void Update(GameTime gameTime)
48         {
49             // TODO: Add your update code here
50
51             base.Update(gameTime);
52         }
53     }
54 }

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;namespace start
{/// <summary>/// This is the main type for your game/// </summary>public class Game1 : Microsoft.Xna.Framework.Game{GraphicsDeviceManager graphics;SpriteBatch spriteBatch;Camera camera;VertexBuffer vertexBuffer;VertexPositionColor[] verts;BasicEffect effect;Matrix world = Matrix.Identity;public Game1(){graphics = new GraphicsDeviceManager(this);}/// <summary>/// Allows the game to perform any initialization it needs to before starting to run./// This is where it can query for any required services and load any non-graphic/// related content.  Calling base.Initialize will enumerate through any components/// and initialize them as well./// </summary>protected override void Initialize(){camera = new Camera(this,new Vector3(0,0,5),Vector3.Zero,Vector3.Up);Components.Add(camera);// TODO: Add your initialization logic herebase.Initialize();}/// <summary>/// LoadContent will be called once per game and is the place to load/// all of your content./// </summary>protected override void LoadContent(){verts = new VertexPositionColor[3];verts[0] = new VertexPositionColor(new Vector3(0, 1, 0), Color.Blue);verts[1] = new VertexPositionColor(new Vector3(1, -1, 0), Color.Red);verts[2] = new VertexPositionColor(new Vector3(-1, -1, 0), Color.Green);vertexBuffer = new VertexBuffer(GraphicsDevice, typeof(VertexPositionColor), verts.Length, BufferUsage.None);vertexBuffer.SetData(verts);// Create a new SpriteBatch, which can be used to draw textures.spriteBatch = new SpriteBatch(GraphicsDevice);//初始化BasicBuffereffect = new BasicEffect(GraphicsDevice);Content.RootDirectory = "Content";// TODO: use this.Content to load your game content here
        }/// <summary>/// UnloadContent will be called once per game and is the place to unload/// all content./// </summary>protected override void UnloadContent(){// TODO: Unload any non ContentManager content here
        }/// <summary>/// Allows the game to run logic such as updating the world,/// checking for collisions, gathering input, and playing audio./// </summary>/// <param name="gameTime">Provides a snapshot of timing values.</param>protected override void Update(GameTime gameTime){// Allows the game to exitif (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)this.Exit();// TODO: Add your update logic here//平移（Tracelotion）KeyboardState keyboardstate = Keyboard.GetState();if (keyboardstate.IsKeyDown(Keys.Left)){world *= Matrix.CreateTranslation(-.01f, 0,0);world *= Matrix.CreateRotationY(MathHelper.PiOver4 / 60);}if (keyboardstate.IsKeyDown(Keys.Right)){world *= Matrix.CreateTranslation(.01f, 0, 0);world *= Matrix.CreateRotationX(MathHelper.PiOver4 / 60);}base.Update(gameTime);}/// <summary>/// This is called when the game should draw itself./// </summary>/// <param name="gameTime">Provides a snapshot of timing values.</param>protected override void Draw(GameTime gameTime){GraphicsDevice.Clear(Color.CornflowerBlue);GraphicsDevice.SetVertexBuffer(vertexBuffer);// TODO: Add your drawing code here//设置物体和摄像机的信息effect.World = world;effect.View = camera.view;effect.Projection = camera.projection;effect.VertexColorEnabled = true;//开始效果，并绘制每个Passforeach (EffectPass pass in effect.CurrentTechnique.Passes){pass.Apply();GraphicsDevice.DrawUserPrimitives<VertexPositionColor>(PrimitiveType.TriangleStrip, verts, 0, 1);}base.Draw(gameTime);}}
}