* Different Approach for GUI Elements

Very soon the implementation reached a point (at least on the [iPhone] side) where it was obvious, that there is a lot of functionality missing, when looking for [Tk] like widgets. That might be partially because Apple wants to look all their GUI stuff look like they want it to be displayed. 

At that time some experiments with [OpenGL ES] started. [OpenGL ES] is a cut down version of [OpenGL] running on [iOS] and on [Android] and as part of [WebGL] in [javascript] for browsers too.

The experiments were based on the idea to use screen buffer implementation of [OpenGL ES] as a base for displaying pixels on the screen and to use some primitive functions of [OpenGL ES] like drawing a line or a rectangle or a polygon and filling some area with colors. For displaying text the idea is to use a freetype font implementation, also available for the [iPhone].
 
Using that approach, it would be possible to use 3-D elements to be shown and also rotation of text would be very easy using [OpenGL ES] functionality.
 
As [OpenGL ES] is also used as a base for some games on [iOS] the guess was, that it should be fast enough for the implementation of a [Tk] GUI.

Having some small  knowledge of [OpenGL] from the implementation of  [ntkwidget] the decision was made to give [OpenGL ES] a try, to see, what can be done using that.

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