C#开发跨平台游戏——自定义游戏鼠标光标
上一篇我们讲了在游戏中使用系统默认鼠标，这一篇我们来讲讲如何在游戏中使用自定义鼠标。
首先我们需要一张透明背景的png图片，鼠标箭头指向左上角顶点位置。尺寸大小为32×32像素。
如图：
各位可以右键图片另存为并重命名为MouseCursor.png。然后将该png图片拷贝到【HelloWorld.XNAContent】项目中。选中MouseCursor.png右键属性，将图片的AssetName改为MouseCursor。Content Importer为Texture-XNA Framework，Content Processor为Texture-XNA Framework （默认无需修改）
打开Game1.cs文件，找到【Color backgoundColor;】在它下面定义一个鼠标的2D纹理和一个鼠标位置
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Texture2D mouseCursor; Vector2 mouseCursorPosition; |
找到【Game1()】构造方法，在方法体内将【IsMouseVisible = true;】改为【IsMouseVisible = false;】
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IsMouseVisible = false; |
找到【LoadContent()】方法，在方法体内加入
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mouseCursor = Content.Load<Texture2D>("MouseCursor"); |
加载鼠标纹理文件，【“MouseCursor”】就是前面定义的Asset Name
找到【Update(GameTime gameTime)】方法，由于前面已经定义了鼠标状态，只需要加入
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mouseCursorPosition = new Vector2(mouseState.X, mouseState.Y); |
定义鼠标移动的位置，Vector2是一个二维坐标。游戏界面左上角顶点为0，0，向右是x轴递增，向下是y轴递增。mouseState.X和mouseState.Y就是鼠标移动到游戏界面中的坐标。
最后找到【Draw(GameTime gameTime)】方法，在【spriteBatch.End();】前面输入
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spriteBatch.Draw(mouseCursor,mouseCursorPosition,Color.White); |
由于spriteBatch.Begin存在层次关系，后画会覆盖前画，鼠标必须在最顶层，所以要放在最后即【spriteBatch.End();】前一行。spriteBatch.Draw的第一个参数是鼠标二维纹理图，第二个参数表示鼠标位置，第三个参数可以认为将白色不绘制。
完整代码如下：
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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 HelloWorld.XNA { /// <summary> /// This is the main type for your game /// </summary> public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; SpriteBatch spriteBatch; SpriteFont defaultFont; Color backgoundColor; Texture2D mouseCursor; Vector2 mouseCursorPosition; public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; graphics.PreferredBackBufferWidth = 800; graphics.PreferredBackBufferHeight = 600; graphics.IsFullScreen = false; IsMouseVisible = false;//使用自定义鼠标，关闭系统默认鼠标 } /// <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() { // TODO: Add your initialization logic here base.Initialize(); } /// <summary> /// LoadContent will be called once per game and is the place to load /// all of your content. /// </summary> protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice); // TODO: use this.Content to load your game content here defaultFont = Content.Load<SpriteFont>("DefaultFont"); backgoundColor = Color.CornflowerBlue; mouseCursor = Content.Load<Texture2D>("MouseCursor"); } /// <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 exit KeyboardState keyboardState = Keyboard.GetState(PlayerIndex.One); if(keyboardState.IsKeyDown(Keys.Escape)) { this.Exit(); } if(keyboardState.IsKeyDown(Keys.F10)) { graphics.IsFullScreen = true; graphics.ApplyChanges(); } if(keyboardState.IsKeyDown(Keys.F11)) { graphics.IsFullScreen = false; graphics.ApplyChanges(); } if (keyboardState.IsKeyDown(Keys.F12)) { graphics.PreferredBackBufferWidth = 1920; graphics.PreferredBackBufferHeight = 1080; graphics.ApplyChanges(); } MouseState mouseState = Mouse.GetState();//获取鼠标状态 if(mouseState.LeftButton==ButtonState.Pressed)//判断是否按下了鼠标左键 { backgoundColor = Color.Red;//将背景设置为红色 } else { backgoundColor = Color.CornflowerBlue;//放开鼠标左键恢复成蓝色 } mouseCursorPosition = new Vector2(mouseState.X, mouseState.Y);//设置自定义鼠标的位置为鼠标移动位置 // TODO: Add your update logic here 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(backgoundColor);//绘制游戏背景 // TODO: Add your drawing code here spriteBatch.Begin(); spriteBatch.DrawString(defaultFont, "这是我的第一个游戏", Vector2.Zero, Color.White); spriteBatch.Draw(mouseCursor,mouseCursorPosition,Color.White);//绘制自定义鼠标 spriteBatch.End(); base.Draw(gameTime); } } } |
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