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[Octave-bug-tracker] [bug #52588] Crazy Scrolling in imagesc

From: Dan Sebald
Subject: [Octave-bug-tracker] [bug #52588] Crazy Scrolling in imagesc
Date: Tue, 5 Dec 2017 18:36:01 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

Follow-up Comment #3, bug #52588 (project octave):

Note that FLTK is a little more similar to gnuplot toolkit in terms of zooming
and panning, except the FLTK toolkit has panning via click-drag while gnuplot
doesn't.  (gnuplot has a zoom feature .)

Furthermore, for the Qt and FLTK toolkits the plot space can be rotated for
which the image object does not rotate but merely scales and interferes with
the plot background surface.  That looks very odd, but I'm sure rotated images
in OpenGL wouldn't be a simple feature to add.  gnuplot has a feature (not
utilized in Octave, I believe) for which images can be rotated in 3D space
(see last example here):


My memory is that if there isn't some underlying support for rotated images in
the library/platform selected, gnuplot will attempt drawing pixels as
parallelograms using the polygon feature, a method that is much, much slower
but works.


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