diff --git a/Source/OpenTK/Math/Box2d.cs b/Source/OpenTK/Math/Box2d.cs
new file mode 100644
index 00000000..eae7f46e
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+++ b/Source/OpenTK/Math/Box2d.cs
@@ -0,0 +1,218 @@
+#region --- License ---
+/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
+ * See license.txt for license info
+ */
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+namespace OpenTK
+{
+ ///
+ /// Defines a 2d box (rectangle).
+ ///
+ [StructLayout(LayoutKind.Sequential)]
+ public struct Box2d
+ {
+ ///
+ /// The left boundary of the structure.
+ ///
+ public double Left;
+
+ ///
+ /// The right boundary of the structure.
+ ///
+ public double Right;
+
+ ///
+ /// The top boundary of the structure.
+ ///
+ public double Top;
+
+ ///
+ /// The bottom boundary of the structure.
+ ///
+ public double Bottom;
+
+ ///
+ /// Constructs a new Box2d with the specified dimensions.
+ ///
+ /// An OpenTK.Vector2d describing the top-left corner of the Box2d.
+ /// An OpenTK.Vector2d describing the bottom-right corner of the Box2d.
+ public Box2d(Vector2d topLeft, Vector2d bottomRight)
+ {
+ Left = topLeft.X;
+ Top = topLeft.Y;
+ Right = bottomRight.X;
+ Bottom = bottomRight.Y;
+ }
+
+ ///
+ /// Constructs a new Box2d with the specified dimensions.
+ ///
+ /// The position of the left boundary.
+ /// The position of the top boundary.
+ /// The position of the right boundary.
+ /// The position of the bottom boundary.
+ public Box2d(double left, double top, double right, double bottom)
+ {
+ Left = left;
+ Top = top;
+ Right = right;
+ Bottom = bottom;
+ }
+
+ ///
+ /// Creates a new Box2d with the specified dimensions.
+ ///
+ /// The position of the top boundary.
+ /// The position of the left boundary.
+ /// The position of the right boundary.
+ /// The position of the bottom boundary.
+ /// A new OpenTK.Box2d with the specfied dimensions.
+ public static Box2d FromTLRB(double top, double left, double right, double bottom)
+ {
+ return new Box2d(left, top, right, bottom);
+ }
+
+ ///
+ /// Creates a new Box2d with the specified dimensions.
+ ///
+ /// The position of the top boundary.
+ /// The position of the left boundary.
+ /// The width of the box.
+ /// The height of the box.
+ /// A new OpenTK.Box2d with the specfied dimensions.
+ public static Box2d FromDimensions(double left, double top, double width, double height)
+ {
+ return new Box2d(left, top, left + width, top + height);
+ }
+
+ ///
+ /// Creates a new Box2d with the specified dimensions.
+ ///
+ /// The position of the top left corner.
+ /// The size of the box.
+ /// A new OpenTK.Box2d with the specfied dimensions.
+ public static Box2d FromDimensions(Vector2d position, Vector2d size)
+ {
+ return FromDimensions(position.X, position.Y, size.X, size.Y);
+ }
+
+ ///
+ /// Creates a new Box2d from the specified corners.
+ ///
+ /// One of the corners of the box.
+ /// The opposite corner of the box.
+ ///
+ public static Box2d FromCorners(Vector2d corner1, Vector2d corner2)
+ {
+ Box2d box;
+ if (corner1.X < corner2.X)
+ {
+ box.Left = corner1.X;
+ box.Right = corner2.X;
+ }
+ else
+ {
+ box.Left = corner2.X;
+ box.Right = corner1.X;
+ }
+
+ if (corner1.Y < corner2.Y)
+ {
+ box.Top = corner1.Y;
+ box.Bottom = corner2.Y;
+ }
+ else
+ {
+ box.Top = corner2.Y;
+ box.Bottom = corner1.Y;
+ }
+
+ return box;
+ }
+
+ ///
+ /// Gets a double describing the width of the Box2d structure.
+ ///
+ public double Width { get { return (double)System.Math.Abs(Right - Left); } }
+
+ ///
+ /// Gets a double describing the height of the Box2d structure.
+ ///
+ public double Height { get { return (double)System.Math.Abs(Bottom - Top); } }
+
+ ///
+ /// Returns whether the box contains the specified point.
+ ///
+ /// The point to query.
+ /// Whether this box contains the point.
+ public bool Contains(Vector2d point)
+ {
+ return (point.X >= Left != point.X > Right) && (point.Y >= Top != point.Y > Bottom);
+ }
+
+ ///
+ /// Returns a Box2d translated by the given amount.
+ ///
+ ///
+ ///
+ public Box2d Translate(Vector2d point)
+ {
+ return new Box2d(Left + point.X, Top + point.Y, Right + point.X, Bottom + point.Y);
+ }
+
+ ///
+ /// Equality comparator.
+ ///
+ public static bool operator ==(Box2d left, Box2d right)
+ {
+ return left.Bottom == right.Bottom && left.Top == right.Top &&
+ left.Left == right.Left && left.Right == right.Right;
+ }
+
+ ///
+ /// Inequality comparator.
+ ///
+ public static bool operator !=(Box2d left, Box2d right)
+ {
+ return !(left == right);
+ }
+
+ ///
+ /// Functional equality comparator.
+ ///
+ public bool Equals(Box2d other)
+ {
+ return this == other;
+ }
+
+ ///
+ /// Implements Object.Equals.
+ ///
+ public override bool Equals(object obj)
+ {
+ return obj is Box2d && Equals((Box2d) obj);
+ }
+
+ ///
+ /// Gets the hash code for this Box2d.
+ ///
+ ///
+ public override int GetHashCode()
+ {
+ return Left.GetHashCode() ^ Right.GetHashCode() ^ Top.GetHashCode() ^ Bottom.GetHashCode();
+ }
+
+ private static string listSeparator = System.Globalization.CultureInfo.CurrentCulture.TextInfo.ListSeparator;
+ ///
+ /// Returns a describing the current instance.
+ ///
+ ///
+ public override string ToString()
+ {
+ return String.Format("({0}{4} {1}) - ({2}{4} {3})", Left, Top, Right, Bottom, listSeparator);
+ }
+ }
+}