[Octave-bug-tracker] [bug #58956] Empty plot for certain xlim / ylim settings

[Hg200]

Follow-up Comment #28, bug #58956 (project octave):

<< With the OpenGL coordinate system centered at the target, do you think that
it would be possible to do the rescaling for bug #32980 with these
transformation matrices (in a follow up patch)?

I think it is not possible to fix bug #32980 comment 25 by merely changing the
view transformation and the projection matrix. If I take the example from
comment 25, convert the time to simple precision and try to "normalize" the
view by translating the abscissa by a constant, the same artifacts are
produced:

++
t = now-1:(1/1440):now;
x = -cos(2*pi*t) + rand(size(t))/10;
t = single(t) - single(fix(now));
plot(t,x)
--

Most likely the data is already unrecoverable when we leave
opengl_renderer::draw_line() because eventually glVertex3d() is called. 


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