[Octave-bug-tracker] [bug #49053] figure scaling issue with Qt 5 on macOS with Retina / HiDPI scaling

[Rik]

Update of bug #49053 (project octave):

                 Release:                   4.2.0 => dev                    
        Operating System:                  Mac OS => Any                    

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Follow-up Comment #82:

@Ben: Could you file a separate bug report about line width?  I'm pretty sure
the issue is just conversion.  According to Matlab documentation, "LineWidth"
is specified in points.  But, Octave is using the glLineWidth call with no
conversion which sets a value in pixels.  Hence, on an average screen Matlab
draws a LineWidth 1 object that is 1/72 of an inch.  But Octave would draw a
line which is 1/96 of an inch (standard DPI).  Hence Octave's line will be
72/96 or 75% of Matlab's line.  I pulled your images up in GIMP and zoomed in
to 2300% and I measure Octave's line at ~4.3 pixels and Matlab's at ~6.1
pixels for a ratio of 70%.

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