3.立方体和旋转

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static void Main(string[] args)        {            GameWindow game = new GameWindow();            game.Load += (sender, e) =>            {                // setup settings, load textures, sounds                game.VSync = VSyncMode.On;                GL.ClearColor(System.Drawing.Color.MidnightBlue);                GL.Enable(EnableCap.DepthTest);                GL.Enable(EnableCap.Blend);                GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);                GL.Viewport(0, 0, game.Width, game.Height);                //GL.Viewport(this.ClientRectangle);                GL.MatrixMode(MatrixMode.Projection);                Matrix4 proj = Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, game.ClientRectangle.Width / (float)game.ClientRectangle.Height, 1.0F, 100F);                GL.LoadMatrix(ref proj);            };            game.Resize += (sender, e) =>            {                GL.Viewport(0, 0, game.Width, game.Height);                //GL.Viewport(this.ClientRectangle);                GL.MatrixMode(MatrixMode.Projection);                Matrix4 proj = Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, game.ClientRectangle.Width / (float)game.ClientRectangle.Height, 1.0F, 100F);                GL.LoadMatrix(ref proj);            };            game.UpdateFrame += (sender, e) =>            {                // add game logic, input handling                if (game.Keyboard[Key.Escape])                {                    game.Exit();                }                if (game.Keyboard[Key.Enter])                {                    if (game.WindowState == WindowState.Fullscreen)                    {                        game.WindowState = WindowState.Normal;                    }                    else                    {                        game.WindowState = WindowState.Fullscreen;                    }                }            };            game.RenderFrame += (sender, e) =>                {                    GL.ClearColor(Color.SkyBlue);                    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);                    Matrix4 modelView = Matrix4.LookAt(new Vector3(0.0F, 5.0F, 10.0F), Vector3.Zero, Vector3.UnitY);                    GL.MatrixMode(MatrixMode.Modelview);                    GL.LoadMatrix(ref modelView);                    //                    GL.Rotate(_angle * 0.18F / (float)Math.PI, Vector3.One);                    GL.Color4(Color.FromArgb(100, Color.Red));                    GL.Begin(BeginMode.Triangles);                    int i = 0;                    foreach (var index in _cube.Indices)                    {                        switch (i%6)                        {                            case 0:                                GL.Color3(Color.MidnightBlue);                                break;                            case 1:                                GL.Color3(Color.SpringGreen);                                break;                            case 2:                                GL.Color3(Color.YellowGreen);                                break;                            case 3:                                GL.Color3(Color.YellowGreen);                                break;                            case 4:                                GL.Color3(Color.SpringGreen);                                break;                            case 5:                                GL.Color3(Color.OrangeRed);                                break;                            default:                                GL.Color3(Color.Ivory);                                break;                        }                        i++;                        GL.Vertex3(_cube.Vertices[index]);                    }                    GL.End();                    //                    _angle++;                    game.SwapBuffers();                };            game.Run();          }
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