Added Fonts example (Tutorial 6) that showcases the use of the TextureFont class.

Source/Examples/Tutorial/Fonts.cs

@@ -0,0 +1,108 @@
+#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 OpenTK;
+using OpenTK.Fonts;
+using OpenTK.OpenGL;
+using OpenTK.Input;
+
+namespace Examples.Tutorial
+{
+    class Fonts : GameWindow, IExample
+    {
+        public Fonts() : base(new DisplayMode(800, 600), String.Format("OpenTK | Tutorial {0}: Fonts", order))
+        {
+            this.VSync = VSyncMode.On;
+        }
+
+        TextureFont serif;
+
+        string[] poem = Resources.Poem.Replace('\r', ' ').Split('\n');
+        float scroll_speed;
+        float scroll_position;
+        float initial_position;
+        float warparound_position;
+        float current_position;
+
+        public override void OnLoad(EventArgs e)
+        {
+            GL.Enable(GL.Enums.EnableCap.TEXTURE_2D);
+            serif = new TextureFont(new Font(FontFamily.GenericSerif, 24, FontStyle.Regular, GraphicsUnit.Pixel));
+            serif.LoadGlyphs("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz,.!?");
+
+            scroll_speed = 4/(float)Height;
+            initial_position = -1.0f - 64 / (float)Height;  // 64 pixels below the bottom of the screen;
+            warparound_position = 7.0f;
+            current_position = initial_position;
+        }
+
+        protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
+        {
+            GL.Viewport(0, 0, Width, Height);
+            GL.MatrixMode(GL.Enums.MatrixMode.PROJECTION);
+            GL.LoadIdentity();
+            GL.Ortho(-1.0, 1.0, -1.0, 1.0, 0.0, 16.0);
+        }
+
+        public override void OnUpdateFrame(UpdateFrameEventArgs e)
+        {
+            if (Keyboard[Key.Space])
+                scroll_speed = 0.0f;
+            if (Keyboard[Key.Down])
+                scroll_speed -= 1 / (float)Height;
+            if (Keyboard[Key.Up])
+                scroll_speed += 1 / (float)Height;
+            if (Keyboard[Key.Escape])
+                this.Exit();
+        }
+
+        public override void OnRenderFrame(RenderFrameEventArgs e)
+        {
+            GL.MatrixMode(GL.Enums.MatrixMode.MODELVIEW);
+            GL.LoadIdentity();
+
+            // We'll start printing from the lower left corner of the screen. The text
+            // will slowly move updwards - the user can control the movement speed with
+            // the keyboard arrows and the space bar.
+            current_position += scroll_speed * (float)e.ScaleFactor;
+            if (current_position > 0.0f && current_position > warparound_position)
+                current_position = initial_position;
+            else if (current_position < 0.0f && current_position < initial_position)
+                current_position = warparound_position;
+            scroll_position = ((int)(current_position * (float)Height)) / (float)Height;    // Round to closest pixel.
+
+            GL.Translate(-1.0f, scroll_position, 0.0f);
+
+            GL.Clear(GL.Enums.ClearBufferMask.COLOR_BUFFER_BIT);
+            
+            float line_spacing = -2.0f * serif.LineSpacing / (float)Height;
+            foreach (string line in poem)
+            {
+                serif.Print(line);
+                GL.Translate(0.0f, line_spacing, 0.0f);   // Move to the next line.
+            }
+
+            SwapBuffers();
+        }
+
+
+        #region IExample Members
+
+        public void Launch() 
+        {
+            Run(30.0, 85.0);
+        }
+
+        public static readonly int order = 6;
+
+        #endregion
+    }
+}