using System;
using System.Drawing;
using OpenTK;
using OpenTK.Graphics.OpenGL;
using OpenTK.Input;

namespace Examples.Tutorial
{
    public class Runner {
        private class SimpleWindow : GameWindow
        {
            public SimpleWindow() : base(800, 600)
            {
                KeyUp += Key_Up;
            }

            void Key_Up(object sender, OpenTK.Input.KeyboardKeyEventArgs e)
            {
                if (e.Key == Key.A)
                {
                    CursorGrabbed = true;
                }
                else if (e.Key == Key.S)
                {
                    CursorGrabbed = false;
                }
                else if (e.Key == Key.Q)
                {
                    CursorVisible = true;
                }
                else if (e.Key == Key.W)
                {
                    CursorVisible = false;
                }
            }

            protected override void OnLoad(EventArgs e)
            {
                GL.ClearColor(Color.MidnightBlue);
            }

            protected override void OnResize(EventArgs e)
            {
                GL.Viewport(0, 0, Width, Height);

                GL.MatrixMode(MatrixMode.Projection);
                GL.LoadIdentity();
                GL.Ortho(-1.0, 1.0, -1.0, 1.0, 0.0, 4.0);
            }

        }

        public static void Main()
        {
            ToolkitOptions opt = new ToolkitOptions();
            opt.Backend = PlatformBackend.PreferNative;

            Toolkit.Init(opt);

            SimpleWindow example = new SimpleWindow();

            example.Run(30.0, 0.0);
        }
    }
}