On 13 Sep 2009, at 21:32, Tomas Bym wrote:

> Hello,
>  I am trying to draw a rectangle from the point, where the user  
> starts to drag the mouse to the actual mouse position. I tried to  
> make the code like this, it draws the rectangle but only when the  
> mouse is moving. When I stop moving the mouse, the rectangle  
> disapears till I move again.
> Can you please help me to make the rectangle visible until I  
> release the mouse button?

I think the traditional way to do that is via a Fl_Overlay_Window,  
see Greg's demo:
http://www.seriss.com/people/erco/fltk/#Overlay



However, I don't think that integrates well with OpenGL, so may not  
work for you. Perhaps some of the ideas explored in Greg's example  
here might help:

http://www.seriss.com/people/erco/fltk/#GL4PortResizable





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