unit vector ratio does not behave as expected

Migrated from SourceForge https://sourceforge.net/p/pgfplots/bugs/80/ Author: ljeub Timestamp: 2015-03-20 16:02:12.891000

https://sourceforge.net/p/pgfplots/bugs/80/attachment/test.png Hi,

I was trying to implement 3d-plots with fixed aspect ratio (see https://github.com/matlab2tikz/matlab2tikz/pull/560), and I ran into issues with the behaviour of scale mode=scale uniformly and unit vector ratio.

Consider this example, which is set up such that the width and height constraints can both be satisfied simultaneously, and the unit vector ratio=2 2 1 is set up such that it should produce equivalent results to plot box ratio=3 2 1 which behaves as expected:

:::latex
\documentclass[tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=6.027778in,
height=4.310278in,
scale only axis,
plot box ratio=3 2 1,
% This plot is set up to have this unit vector ratio:
%unit vector ratio=2 2 1,
%unit vector ratio=4 4 2,
%
% width and height are setup to have the correct ratio, so the startegies should be equivalent:
%scale uniformly strategy=units only,
%scale uniformly strategy=change vertical limits,
%scale uniformly strategy=change horizontal limits,
xmin=-1,
xmax=2,
ymin=-1,
ymax=1,
zmin=-1,
zmax=1,
view={-37.5}{30},
]
\end{axis}

\begin{axis}[%
width=6.027778in,
height=4.310278in,
%
% these unit vector ratios should all be equivalent:
%unit vector ratio=1.4 1,
%unit vector ratio=0.7 0.5,
%unit vector ratio=2.8 2,
%unit vector ratio=1.54 1.1,
%
% width and height are setup to have the correct ratio, so the startegies should be equivalent:
%scale uniformly strategy=units only,
%scale uniformly strategy=change vertical limits,
%scale uniformly strategy=change horizontal limits,
scale only axis,
xmin=0,
xmax=1,
ymin=0,
ymax=1,
]
\end{axis}
\end{tikzpicture}%
\end{document}

Here is what the example looks like:

pgf-tikz / pgfplots

unit vector ratio does not behave as expected #80