> Is there any (undocumented) method that I can use to access 
> the buffer that draw() or its methods (addvertex, fillpath, 
> etc..) so that, once I've  completed my drawing, I could copy 
> that buffer? I need to make a movie of my GUI for my 
> customer, and I'd prefer not to have to recreate the drawing 
> method again with a different API. Thanks!

You can read back the image that draw() creates by using the function:

uchar *fl_read_image(uchar *p, int X, int Y, int W, int H, int alpha =
0);

Which is a documented function, as it happens.

However, reading back from an on-screen buffer can be fraught with
difficulties, as that will read everything in the rectangle mapped for
your window, which may (or may not) have been overlayed by other
window's areas by the window manager (that fltk will not know about...)

You may be better compositing your image in an off-screen buffer, then
blitting that composited image to the display (and using fl_read_image()
on the offscreen to get your screen grabs too, of course.) See
fl_create_offscreen(...) et al in the docs for some description of using
this approach.

-- 
Ian








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