这节课我们将要学习在地图上随机生成金币黄色方块代替玩家碰到金币后金币消失分数增加屏幕左上角显示实时分数将game1替换为using Microsoft.Xna.Framework;using Microsoft.Xna.Framework.Graphics;using Microsoft.Xna.Framework.Input;using System;using System.Collections.Generic;namespace MY_FIRST_GAME{public class Game1 : Game{private GraphicsDeviceManager _graphics;private SpriteBatch _spriteBatch;// 玩家private Texture2D playerTexture;private Vector2 playerPosition;private float playerSpeed 200f;// ★ 金币private Texture2D coinTexture;private ListVector2 coins;private Random rng;private int score;// 字体显示分数用private SpriteFont font;public Game1(){_graphics new GraphicsDeviceManager(this);Content.RootDirectory Content;IsMouseVisible true;}protected override void Initialize(){_graphics.PreferredBackBufferWidth 800;_graphics.PreferredBackBufferHeight 600;_graphics.ApplyChanges();playerPosition new Vector2(400, 300);rng new Random();coins new ListVector2();score 0;// 生成 5 个金币SpawnCoins(5);base.Initialize();}protected override void LoadContent(){_spriteBatch new SpriteBatch(GraphicsDevice);// 加载玩家图片using var stream System.IO.File.OpenRead(Content/player.png);playerTexture Texture2D.FromStream(GraphicsDevice, stream);// ★ 创建金币纹理黄色 32x32 方块coinTexture new Texture2D(GraphicsDevice, 32, 32);Color[] data new Color[32 * 32];for (int i 0; i data.Length; i)data[i] Color.Gold;coinTexture.SetData(data);// ★ 加载字体需要先创建字体文件见下方说明// font Content.LoadSpriteFont(font);}// ★ 生成金币private void SpawnCoins(int count){for (int i 0; i count; i){float x rng.Next(50, 750);float y rng.Next(50, 550);coins.Add(new Vector2(x, y));}}protected override void Update(GameTime gameTime){KeyboardState keyboard Keyboard.GetState();float speed playerSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds;float deltaTime (float)gameTime.ElapsedGameTime.TotalSeconds;// 移动if (keyboard.IsKeyDown(Keys.W) || keyboard.IsKeyDown(Keys.Up))playerPosition.Y - speed;if (keyboard.IsKeyDown(Keys.S) || keyboard.IsKeyDown(Keys.Down))playerPosition.Y speed;if (keyboard.IsKeyDown(Keys.A) || keyboard.IsKeyDown(Keys.Left))playerPosition.X - speed;if (keyboard.IsKeyDown(Keys.D) || keyboard.IsKeyDown(Keys.Right))playerPosition.X speed;// 限制玩家不超出窗口playerPosition.X Math.Clamp(playerPosition.X, 32, 768);playerPosition.Y Math.Clamp(playerPosition.Y, 32, 568);// ★ 检测金币碰撞CheckCoinCollision();// ★ 金币捡完了重新生成if (coins.Count 0)SpawnCoins(5);if (keyboard.IsKeyDown(Keys.Escape))Exit();base.Update(gameTime);}// ★ 碰撞检测private void CheckCoinCollision(){Rectangle playerRect new Rectangle((int)playerPosition.X - 32,(int)playerPosition.Y - 32,64, 64);for (int i coins.Count - 1; i 0; i--){Rectangle coinRect new Rectangle((int)coins[i].X, (int)coins[i].Y, 32, 32);if (playerRect.Intersects(coinRect)){coins.RemoveAt(i); // 移除金币score 10; // 加分}}}protected override void Draw(GameTime gameTime){GraphicsDevice.Clear(Color.CornflowerBlue);_spriteBatch.Begin();// 画所有金币foreach (Vector2 coinPos in coins){_spriteBatch.Draw(coinTexture, coinPos, Color.White);}// 画玩家以图片中心为锚点_spriteBatch.Draw(playerTexture,playerPosition,null,Color.White,0f,new Vector2(playerTexture.Width / 2, playerTexture.Height / 2),1f,SpriteEffects.None,0f);// ★ 画分数暂时用窗口标题栏显示Window.Title $分数{score} | 剩余金币{coins.Count};_spriteBatch.End();base.Draw(gameTime);}}}本节课学习的新内容1. 碰撞检测Rectangle.Intersects()Rectangle playerRect new Rectangle(玩家左上角X, 玩家左上角Y, 宽度, 高度); Rectangle coinRect new Rectangle(金币X, 金币Y, 32, 32); if (playerRect.Intersects(coinRect)) { // 碰撞了 }2. 以图片中心为锚点画图_spriteBatch.Draw( playerTexture, // 纹理 playerPosition, // 位置 null, // 不裁剪 Color.White, // 颜色 0f, // 不旋转 new Vector2(width/2, height/2), // ★ 锚点设为中心 1f, // 不缩放 SpriteEffects.None, // 不翻转 0f // 深度 );3.Math.Clamp限制范围playerPosition.X Math.Clamp(playerPosition.X, 最小值, 最大值);好了这节课就此结束关注我下期更精彩
