在openTK中旋转图像

using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Input;

public class Game : GameWindow
{
    private int texture;

    public Game() : base(800, 600, GraphicsMode.Default, "Image Rotation Example") { }

    protected override void OnLoad(EventArgs e)
    {
        GL.ClearColor(Color4.Black);

        GL.Enable(EnableCap.Texture2D);

        texture = LoadTexture("image.jpg"); // 加载图像并创建纹理对象

        base.OnLoad(e);
    }

    private int LoadTexture(string filename)
    {
        // 实现图像加载逻辑，并返回纹理对象ID
    }

    protected override void OnUpdateFrame(FrameEventArgs e)
    {
        if (Keyboard.GetState().IsKeyDown(Key.Escape))
            Exit();

        base.OnUpdateFrame(e);
    }

    protected override void OnRenderFrame(FrameEventArgs e)
    {
        GL.Clear(ClearBufferMask.ColorBufferBit);

        GL.MatrixMode(MatrixMode.Modelview);
        GL.LoadIdentity();

        GL.Translate(Width / 2, Height / 2, 0); // 将原点移动到窗口中心
        GL.Rotate(45, Vector3d.UnitZ); // 以Z轴为中心旋转45度

        GL.BindTexture(TextureTarget.Texture2D, texture); // 绑定纹理对象

        // 绘制矩形，并贴上纹理
        GL.Begin(PrimitiveType.Quads);
        GL.TexCoord2(0, 0); GL.Vertex2(-100, -100);
        GL.TexCoord2(1, 0); GL.Vertex2(100, -100);
        GL.TexCoord2(1, 1); GL.Vertex2(100, 100);
        GL.TexCoord2(0, 1); GL.Vertex2(-100, 100);
        GL.End();

        SwapBuffers();

        base.OnRenderFrame(e);
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        using (var game = new Game())
        {
            game.Run(60.0);
        }
    }
}