[Octave-bug-tracker] [bug #52185] Make it possible to position annotations relative to axes or data

[Etienne Dechamps]

Follow-up Comment #1, bug #52185 (project octave):

I discovered the following workaround which (almost) does what I want:


a = annotation('arrow', [0 1], [0 1]);
set(a, 'parent', gca());


Indeed, by default, annotations get created in a separate "implicit" axes
object that spans the entire figure. Changing the annotation to use a
different axes as its parent changes its coordinate system to the data
coordinate system of the specified axes, and voilà.

The downside is, when using arrows (for example), *everything* becomes
relative to the data coordinate system, including the drawing of the
arrowhead. This means, for example, that if the axes are non-square (or worse,
use a log scale), the arrowhead will be deformed. This is probably not a
problem for line annotations, however.

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