#region --- License ---
/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
 * See license.txt for license info
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Diagnostics;

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

namespace Examples.Tutorial
{
    /// <summary>
    /// Demonstrates the GameWindow class.
    /// </summary>
    [Example("Simple Window", ExampleCategory.Tutorial, 1)]
    public class T01_Simple_Window : GameWindow
    {
        public T01_Simple_Window() : base(640, 480, new GraphicsMode(16))
        {
            Keyboard.KeyDown += new OpenTK.Input.KeyDownEvent(Keyboard_KeyDown);
        }

        #region Keyboard_KeyDown

        /// <summary>
        /// Occurs when a key is pressed.
        /// </summary>
        /// <param name="sender">The KeyboardDevice which generated this event.</param>
        /// <param name="key">The key that was pressed.</param>
        void Keyboard_KeyDown(KeyboardDevice sender, Key key)
        {
            if ((sender[Key.AltLeft] || sender[Key.AltRight]) && sender[Key.Enter])
                this.Fullscreen = !this.Fullscreen;

            if (sender[Key.Escape])
                this.Exit();
        }

        #endregion

        #region OnLoad

        /// <summary>
        /// Setup OpenGL and load resources here.
        /// </summary>
        /// <param name="e">Not used.</param>
        public override void OnLoad(EventArgs e)
        {
            GL.ClearColor(Color.SteelBlue);
        }

        #endregion

        #region OnResize

        /// <summary>
        /// Respond to resize events here.
        /// </summary>
        /// <param name="e">Contains information on the new GameWindow size.</param>
        /// <remarks>There is no need to call the base implementation.</remarks>
        protected override void OnResize(OpenTK.Platform.ResizeEventArgs 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);

            base.OnResize(e);
        }

        #endregion

        #region OnUpdateFrame

        /// <summary>
        /// Add your game logic here.
        /// </summary>
        /// <param name="e">Contains timing information.</param>
        /// <remarks>There is no need to call the base implementation.</remarks>
        public override void OnUpdateFrame(UpdateFrameEventArgs e)
        {
            // Nothing to do!
        }

        #endregion

        #region OnRenderFrame

        /// <summary>
        /// Add your game rendering code here.
        /// </summary>
        /// <param name="e">Contains timing information.</param>
        /// <remarks>There is no need to call the base implementation.</remarks>
        public override void OnRenderFrame(RenderFrameEventArgs e)
        {
            GL.Clear(ClearBufferMask.ColorBufferBit);

            GL.Begin(BeginMode.Triangles);

            GL.Color3(Color.LightSteelBlue);
            GL.Vertex2(-1.0f, 1.0f);
            GL.Color3(Color.SpringGreen);
            GL.Vertex2(0.0f, -1.0f);
            GL.Color3(Color.Ivory);
            GL.Vertex2(1.0f, 1.0f);

            GL.End();

            this.SwapBuffers();
        }

        #endregion
        
        #region public static void Main()

        /// <summary>
        /// Entry point of this example.
        /// </summary>
        [STAThread]
        public static void Main()
        {
            using (T01_Simple_Window example = new T01_Simple_Window())
            {
                // Get the title and category  of this example using reflection.
                Utilities.SetWindowTitle(example);
                example.Run(30.0, 0.0);
            }
        }

        #endregion
    }
}