在MonoGame中绘制矩形

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Content;

public class Game1 : Game
{
    private GraphicsDeviceManager _graphics;
    private SpriteBatch _spriteBatch;
    private Texture2D _rectangleTexture;

    public Game1()
    {
        _graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
        IsMouseVisible = true;
    }

    protected override void Initialize()
    {
        // TODO: Add your initialization logic here

        base.Initialize();
    }

    protected override void LoadContent()
    {
        _spriteBatch = new SpriteBatch(GraphicsDevice);

        // 加载一个简单的矩形纹理
        _rectangleTexture = new Texture2D(GraphicsDevice, 1, 1);
        _rectangleTexture.SetData(new[] { Color.White });

        base.LoadContent();
    }

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

        _spriteBatch.Begin();

        // 绘制填充矩形
        _spriteBatch.Draw(_rectangleTexture, new Rectangle(50, 50, 100, 100), Color.Red);

        // 绘制空心矩形
        _spriteBatch.Draw(_rectangleTexture, new Rectangle(200, 50, 100, 100), Color.Blue);
        _spriteBatch.Draw(_rectangleTexture, new Rectangle(200, 50, 100, 100), Color.White, 0, Vector2.Zero, SpriteEffects.None, 0);

        _spriteBatch.End();

        base.Draw(gameTime);
    }
}