[Octave-bug-tracker] [bug #44959] Display coordinates of mouse cursor in QtHandles figures

[Pantxo Diribarne]

Follow-up Comment #18, bug #44959 (project octave):

@Martin:Qt uses the exact same opengl rendering class as fltk, the problem is
not the gui toolkit but OpenGl.

If you zoom-in a plot to see points that have *relative distance* (i.e.
(x1-x2)/x1) smaller than the opengl precision (~ 2e-7) you'll end up with
points that are randomly placed as opengl is unable to compute their
coordinates accurately using single precision (see bug #45271 , related to the
previously cited bug). Trying to retrieve their coordinates with the mouse is
of no use :-). 

Can you propose a simple example script, using fltk, where mouse coordinates
are not enough accurate?

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