在monogame中克隆和绘制对象

Posted 2023-04-14

【中文标题】在monogame中克隆和绘制对象

【英文标题】：Cloning and drawing Objects in monogame

【发布时间】：2021-12-18 08:47:27

【问题描述】：

我如何克隆一个对象，然后选择一个随机位置，然后绘制它。

这是我的对象代码：

public class Trash : ICloneable
    
        private Texture2D _texture;

        private float _rotation;

        public Vector2 Position;

        
        public Vector2 Origin;

        
        public float RotationVelocity = 3f;

       
        public float LinearVelocity = 4f;

        public Trash(Texture2D texture)
        
            _texture = texture;
        

        public void Update()
        
         // Do epic stuff here            

        

        public void Draw(SpriteBatch spriteBatch)
        
            spriteBatch.Draw(_texture, Position, null, Color.White, _rotation, Origin, 1, SpriteEffects.None, 0f);
        
        public object Clone()
        
            return this.MemberwiseClone();
        

这是我目前在 Game1.cs 中的代码：

public class Game1 : Game
    
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        private SeaJam.Objects.Trash Trash;
        

        public Game1()
        
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        

        /// <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();
        
        protected override void LoadContent()
        
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            var texture = Content.Load<Texture2D>("Prototype");

            Trash = new Objects.Trash(texture)
            
                Position = new Vector2(100, 100),
                Origin = new Vector2(texture.Width / 2, texture.Height - 25),
            ;
        
        protected override void Update(GameTime gameTime)
        
            Trash.Update();

            base.Update(gameTime);
        
        protected override void Draw(GameTime gameTime)
        
            GraphicsDevice.Clear(Color.CornflowerBlue);

            spriteBatch.Begin();

            Trash.Draw(spriteBatch);

            spriteBatch.End();

            base.Draw(gameTime);
        
        private void AddTrash()
        
            var rnd = new System.Random();
            var NewTrash = Trash.Clone();

            
        

问题是每当我尝试在 AddTrash() 方法中为克隆提供随机位置时，我只会得到错误，例如“'object'不包含'Position'的定义并且没有可以找到接受“object”类型的第一个参数的可访问扩展方法“Position”（您是否缺少 using 指令或程序集引用？）”

【参考方案1】：

你的构造函数：

public Trash(Texture2D texture)

    _texture = texture;

需要使用所需的可变参数进行扩展。在您的情况下，它需要添加Position 和Origin 作为参数，然后将其作为值应用。

像这样：

public Trash(Texture2D texture, Vector2 position, Vector2 origin)

    _texture = texture;
    Position = position;
    Origin = origin;

还要改变你在 game1.cs 中的调用方式，它们需要像 texture 一样工作：

var texture = Content.Load<Texture2D>("Prototype");
var position = new Vector2(100, 100),
var origin = new Vector2(texture.Width / 2, texture.Height - 25),

Trash = new Objects.Trash(texture, position, origin);

作为提示：保持字段名称的一致性，在一个字段中混合下划线和小写字母，而在另一个字段中混合使用大写字母会让人难以理解。特别是当参数也需要与字段不同的名称时。我更喜欢将它们全部保留第一个字母大写。