How to change the linewidth in a figure before actually plotting some?

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Ruben
Ruben on 2 Dec 2014
Answered: Salvador Castaneda on 23 Oct 2021
I'm working on a matlab function that automatically opens your figure in full screen mode and on a second monitor if present. So far, everything works fine. I already achieved to set the fontsize inside the function, so whitout plotting anything and without making xlabel(..) etc.:
% Fontsize used at the figure
if ~exist('fontsize_manual','var')|| isempty(fontsize_manual)
set(gca,'FontSize',16)
else
set(gca,'Fontsize',fontsize_manual)
end
Now is my question: Can I change in a same way the linewidth of the lines that will by plotted in the figure? So also here, predefining the linewidth inside the function and later on in your script plotting some lines etc. I do prefer this works only for the figure you're working on, so that you can change this 'default' for each figure and save them all with different linewidth and fontsizes if needed.
I tried the line below, but that only changed the linewidth of the axis.
set(gca,'LineWidth',2)
Is there anyone who can help me solving this problem?

Accepted Answer

dpb
dpb on 2 Dec 2014
Use the technique of the referenced page but set the default for the figure in question --
set(gca,'DefaultLineLineWidth',2)
NB: the default properties are named in run-on fashion--the name of the object you're setting then the property within that object all preceded with the keyword 'Default'. Here that's
Default:Line:LineWidth
to separate the subsets visually. I think it would've been easier if TMW had used such nomenclature or a structure form instead (and probably the parsing internally would've been simpler as well).
  9 Comments
dpb
dpb on 4 Dec 2014
Primarily it looks like everywhere you have a gca you really want something that goes back to your original question and to probably try to set defaults for the just-created figure using
set(figure_handle,'DefaultLineLineWidth',2)
or the desired property/properties on the various other objects besides Line. You'll have to investigate which are and are not inherited from the figure; I don't know that otomh. In the initial query the linewidth property is; I've not investigated for the various font properties from whom they get derived. But, if you can't get to them from the figure then you'll have to have another level at which you create and save the right handles for the axes if you do want to make these dependent on specific figures and axes within those figures rather than global.
It's all doable; you just have to figure out where is the highest point in the object hierarchy you can do so. Try the figure first, obviously, but as soon as you use gca you've gone to an axes level, not figure so you'll have to see if it works substituting gcf first, then switch to the actual figure. If gcf fails because of invalid property then you've got to make the axes object and use (and save) that handle that's tied with the given parent figure.

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More Answers (2)

Robert Cumming
Robert Cumming on 3 Dec 2014
set(0,'DefaultLineLineWidth',2)
This will set the line width for all plots in the current session
The technique your using in @dpb answer only sets the current axes (i.e. gca).
  1 Comment
Ruben
Ruben on 3 Dec 2014
Yeah, but I would have the freedom to choose the linewidth of the plotted object per figure... (A) So the answer @dpb is more suitable for my problem.

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