Disabled OpenTK.Point, Size and Rectangle structures that were meant to replace their System.Drawing implementations until the correct course of action can be determined. This change is too disruptive to existing applications, especially if they are also using Windows.Forms (see discussion here: http://www.opentk.com/node/1348).

Source/OpenTK/Graphics/ES20/Helper.cs

@@ -389,7 +389,7 @@ namespace OpenTK.Graphics.ES20
         {
             GL.Viewport(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
         }
-
+#if NO_SYSDRAWING
         public static void Viewport(OpenTK.Point location, OpenTK.Size size)
         {
             GL.Viewport(location.X, location.Y, size.Width, size.Height);
@@ -399,7 +399,7 @@ namespace OpenTK.Graphics.ES20
         {
             GL.Viewport(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
         }
-
+#endif
         #endregion
 
 #pragma warning restore 3019

Source/OpenTK/Graphics/OpenGL/GLHelper.cs

@@ -826,7 +826,7 @@ namespace OpenTK.Graphics.OpenGL
         {
             GL.Viewport(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
         }
-
+#if NO_SYSDRAWING
         public static void Viewport(OpenTK.Point location, OpenTK.Size size)
         {
             GL.Viewport(location.X, location.Y, size.Width, size.Height);
@@ -836,7 +836,7 @@ namespace OpenTK.Graphics.OpenGL
         {
             GL.Viewport(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height);
         }
-
+#endif
         #endregion
 
         #region TexEnv

Source/OpenTK/Math/Point.cs

@@ -31,6 +31,7 @@ using System.Text;
 
 namespace OpenTK
 {
+#if NO_SYSDRAWING
     /// <summary>
     /// Defines a point on a two-dimensional plane.
     /// </summary>
@@ -230,4 +231,5 @@ namespace OpenTK
 
         #endregion
     }
+#endif
 }

Source/OpenTK/Math/Rectangle.cs

@@ -31,6 +31,7 @@ using System.Text;
 
 namespace OpenTK
 {
+#if NO_SYSDRAWING
     /// <summary>
     /// Represents a rectangular region on a two-dimensional plane.
     /// </summary>
@@ -318,4 +319,5 @@ namespace OpenTK
 
         #endregion
     }
+#endif
 }

Source/OpenTK/Math/Size.cs

@@ -31,6 +31,7 @@ using System.Text;
 
 namespace OpenTK
 {
+#if NO_SYSDRAWING
     /// <summary>
     /// Stores the width and height of a rectangle.
     /// </summary>
@@ -217,4 +218,5 @@ namespace OpenTK
         
         #endregion
     }
+#endif
 }

Source/OpenTK/Platform/MacOS/QuartzDisplayDeviceDriver.cs

@@ -1,11 +1,10 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Text;
 
 namespace OpenTK.Platform.MacOS
 {
-    using Graphics;
+    using System.Drawing;
     using Carbon;
 
     class QuartzDisplayDeviceDriver : IDisplayDeviceDriver

Source/OpenTK/Platform/X11/X11XrandrDisplayDevice.cs

@@ -8,11 +8,9 @@
 
 using System;
 using System.Collections.Generic;
-using System.Runtime.InteropServices;
-using System.Text;
-
-using OpenTK.Graphics;
 using System.Diagnostics;
+using System.Drawing;
+using System.Runtime.InteropServices;
 
 namespace OpenTK.Platform.X11
 {