图块映射冲突检测 C# XNA

我正在尝试用C# XNA为学校项目制作一个非常简单的类似泰拉瑞亚的游戏。我的时间非常有限，否则我可能会花更多的时间试图自己解决这个问题。我创建了一个瓦片地图，但我只是不知道如何使瓷砖"坚固"且无法通过。

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 TileEngine {
     public class Game1 : Microsoft.Xna.Framework.Game
     {
         GraphicsDeviceManager graphics;
         SpriteBatch spriteBatch;
         Texture2D character;
         Vector2 cPosition;
         Rectangle cBounds, t1Bounds;
         List<Texture2D> tileTextures = new List<Texture2D>();
         int[,] tileMap = new int[,]
         {
             { 0, 1, 1, 0, 2, 1, 1, 1, 0, 1, },
             { 0, 1, 1, 0, 2, 1, 1, 1, 0, 1, },
             { 0, 1, 1, 0, 2, 1, 1, 1, 0, 1, },
             { 0, 1, 1, 0, 2, 1, 1, 1, 0, 1, },
         };
         int tileWidth = 64;
         int tileHeight = 36;
         int cameraPositionX = 0;
         int cameraPositionY = 0;
         int vSpeed = 0;
         public Game1()
         {
             graphics = new GraphicsDeviceManager(this);
             Content.RootDirectory = "Content";
         }
         protected override void Initialize()
         {
             IsMouseVisible = true;
             graphics.IsFullScreen = false;
             graphics.PreferredBackBufferWidth = 1280;
             graphics.PreferredBackBufferHeight = 720;
             graphics.ApplyChanges();
             cPosition = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2 - 15, graphics.GraphicsDevice.Viewport.Height / 2 - 20);
             cBounds = new Rectangle((int)(cPosition.X), (int)(cPosition.Y), character.Width, character.Height);
             base.Initialize();
         }
         protected override void LoadContent()
         {
             // Create a new SpriteBatch, which can be used to draw textures.
             spriteBatch = new SpriteBatch(GraphicsDevice);
             Texture2D texture;
             character = Content.Load<Texture2D>("Tiles/character");
             texture = Content.Load<Texture2D>("Tiles/green");
             tileTextures.Add(texture);
             texture = Content.Load<Texture2D>("Tiles/red");
             tileTextures.Add(texture);
             texture = Content.Load<Texture2D>("Tiles/blue");
             tileTextures.Add(texture);
             cBounds = new Rectangle((int)(cPosition.X), (int)(cPosition.Y),  
 character.Width, character.Height);
             // TODO: use this.Content to load your game content here
         }
         protected override void UnloadContent()
         {
             // TODO: Unload any non ContentManager content here
         }

         protected override void Update(GameTime gameTime)
         {
             if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                 this.Exit();
             KeyboardState keyState = Keyboard.GetState();
             vSpeed += 1;
             cameraPositionY += vSpeed;
             if (keyState.IsKeyDown(Keys.Right))
                 cameraPositionX += 5;
             if (keyState.IsKeyDown(Keys.Left))
                cameraPositionX -= 5;
             if (keyState.IsKeyDown(Keys.Space))
                 vSpeed = -15;
             if (cBounds.Intersects(t1Bounds))
             {
                 cameraPositionY = 0;
                 vSpeed = 0;
             }    
             base.Update(gameTime);
         }

         protected override void Draw(GameTime gameTime)
         {
             GraphicsDevice.Clear(Color.CornflowerBlue);
             spriteBatch.Begin();
             int tileMapWidth = tileMap.GetLength(1);
              int tileMapHeight = tileMap.GetLength(0);
             spriteBatch.Draw(character, cPosition, Color.White);
             for (int x = 0; x < tileMapWidth; x++)
             {
                 for (int y = 0; y < tileMapHeight; y++)
                 {
                     int textureIndex = tileMap[y, x];
                     Texture2D texture = tileTextures[textureIndex];
                     spriteBatch.Draw(
                         texture, t1Bounds =
                         new Rectangle(
                             320 + x * tileWidth - cameraPositionX,
                             540 + y * tileHeight - cameraPositionY,
                             tileWidth,
                             tileHeight),
                         Color.White);
                 }
             }
             spriteBatch.End();
             base.Draw(gameTime);
         }
     } }

如您所见，我试图在所有精灵周围制作矩形并检测它们何时相交，但它似乎不起作用。即使我让矩形的东西工作，我也不知道如果它们相交该怎么办。如果我将速度设置为 0，那么它仍然会慢慢"下降"通过块，因为存在默认的垂直加速度。