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// This code was written for the OpenTK library and has been released
// to the Public Domain.
// It is provided "as is" without express or implied warranty of any kind.
#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)
{ }
#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);
var keyboard = OpenTK.Input.Keyboard.GetState();
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(PrimitiveType.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
}
}
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