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#region --- License ---

/* Licensed under the MIT/X11 license.

 * Copyright (c) 2006-2008 the OpenTK Team.

 * This notice may not be removed from any source distribution.

 * See license.txt for licensing detailed licensing details.

 */

#endregion

#region --- Using Directives ---

using System;

using System.Collections.Generic;

using System.Windows.Forms;

using System.Threading;

using System.Drawing;

using OpenTK;

using OpenTK.Graphics;

using OpenTK.Graphics.OpenGL;

#endregion

namespace Examples.Tutorial

{

    /// <summary>

    /// Demonstrates immediate mode rendering.

    /// </summary>

    [Example("Immediate mode", ExampleCategory.OpenGL, "1.x", 1, Documentation="ImmediateMode")]

    public class T03_Immediate_Mode_Cube : GameWindow

    {

        #region --- Fields ---

        const float rotation_speed = 180.0f;

        float angle;

        #endregion

        #region --- Constructor ---

        public T03_Immediate_Mode_Cube() : base(800, 600, new GraphicsMode(16, 16))

                { }

                #endregion      

        #region OnLoad

        protected override void OnLoad(EventArgs e)

        {

            base.OnLoad(e);

            GL.ClearColor(Color.MidnightBlue);

            GL.Enable(EnableCap.DepthTest);

        }

        #endregion

        #region OnResize

        /// <summary>

        /// Called when the user resizes the window.

        /// </summary>

        /// <param name="e">Contains the new width/height of the window.</param>

        /// <remarks>

        /// You want the OpenGL viewport to match the window. This is the place to do it!

        /// </remarks>

        protected override void OnResize(EventArgs e)

        {

            base.OnResize(e);

            GL.Viewport(0, 0, Width, Height);

            double aspect_ratio = Width / (double)Height;

            OpenTK.Matrix4 perspective = OpenTK.Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, (float)aspect_ratio, 1, 64);

            GL.MatrixMode(MatrixMode.Projection);

            GL.LoadMatrix(ref perspective);

        }

        #endregion

        #region OnUpdateFrame

        /// <summary>

        /// Prepares the next frame for rendering.

        /// </summary>

        /// <remarks>

        /// Place your control logic here. This is the place to respond to user input,

        /// update object positions etc.

        /// </remarks>

        protected override void OnUpdateFrame(FrameEventArgs e)

        {

            base.OnUpdateFrame(e);

            if (Keyboard[OpenTK.Input.Key.Escape])

            {

                this.Exit();

                return;

            }

        }

        #endregion

        #region OnRenderFrame

        /// <summary>

        /// Place your rendering code here.

        /// </summary>

        protected override void OnRenderFrame(FrameEventArgs e)

        {

            base.OnRenderFrame(e);

            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            Matrix4 lookat = Matrix4.LookAt(0, 5, 5, 0, 0, 0, 0, 1, 0);

            GL.MatrixMode(MatrixMode.Modelview);

            GL.LoadMatrix(ref lookat);

            angle += rotation_speed * (float)e.Time;

            GL.Rotate(angle, 0.0f, 1.0f, 0.0f);

            DrawCube();

            this.SwapBuffers();

            Thread.Sleep(1);

        }

        #endregion

        #region private void DrawCube()

        private void DrawCube()

        {

            GL.Begin(BeginMode.Quads);

            GL.Color3(Color.Silver);

            GL.Vertex3(-1.0f, -1.0f, -1.0f);

            GL.Vertex3(-1.0f, 1.0f, -1.0f);

            GL.Vertex3(1.0f, 1.0f, -1.0f);

            GL.Vertex3(1.0f, -1.0f, -1.0f);

            GL.Color3(Color.Honeydew);

            GL.Vertex3(-1.0f, -1.0f, -1.0f);

            GL.Vertex3(1.0f, -1.0f, -1.0f);

            GL.Vertex3(1.0f, -1.0f, 1.0f);

            GL.Vertex3(-1.0f, -1.0f, 1.0f);

            GL.Color3(Color.Moccasin);

            GL.Vertex3(-1.0f, -1.0f, -1.0f);

            GL.Vertex3(-1.0f, -1.0f, 1.0f);

            GL.Vertex3(-1.0f, 1.0f, 1.0f);

            GL.Vertex3(-1.0f, 1.0f, -1.0f);

            GL.Color3(Color.IndianRed);

            GL.Vertex3(-1.0f, -1.0f, 1.0f);

            GL.Vertex3(1.0f, -1.0f, 1.0f);

            GL.Vertex3(1.0f, 1.0f, 1.0f);

            GL.Vertex3(-1.0f, 1.0f, 1.0f);

            GL.Color3(Color.PaleVioletRed);

            GL.Vertex3(-1.0f, 1.0f, -1.0f);

            GL.Vertex3(-1.0f, 1.0f, 1.0f);

            GL.Vertex3(1.0f, 1.0f, 1.0f);

            GL.Vertex3(1.0f, 1.0f, -1.0f);

            GL.Color3(Color.ForestGreen);

            GL.Vertex3(1.0f, -1.0f, -1.0f);

            GL.Vertex3(1.0f, 1.0f, -1.0f);

            GL.Vertex3(1.0f, 1.0f, 1.0f);

            GL.Vertex3(1.0f, -1.0f, 1.0f);

            GL.End();

        }

        #endregion

        #region public static void Main()

        /// <summary>

        /// Entry point of this example.

        /// </summary>

        [STAThread]

        public static void Main()

        {

            using (T03_Immediate_Mode_Cube example = new T03_Immediate_Mode_Cube())

            {

                Utilities.SetWindowTitle(example);

                example.Run(30.0, 0.0);

            }

        }

        #endregion

    }

}