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

Question

Ruben 2014-12-2

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/165149-how-to-change-the-linewidth-in-a-figure-before-actually-plotting-some

回答： Salvador Castaneda 2021-10-23

This question maybe a bit like the link below, but this didn't work for me... http://nl.mathworks.com/matlabcentral/answers/102530-how-can-i-change-the-default-settings-for-the-linewidth-property-before-i-plot-a-figure-in-matlab

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?

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Answer 1

dpb 2014-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/165149-how-to-change-the-linewidth-in-a-figure-before-actually-plotting-some#answer_161009

在 MATLAB Online 中打开

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).

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Ruben 2014-12-3

在 MATLAB Online 中打开

This will be (a part of) the plotting in the test-session...

figuur1=fancy_figure('open','figuur1',[],[],[],[]);
  lijn1=plot(x(4:5),[epsilon(4) epsilon(4)],'k');%,'linewidth',2);
  figuur2=fancy_figure('open','figuur2',[],[],[],5);
  plot(x(4:5),[epsilon(4) epsilon(4)],'k')
       And this will be the function that I seperately saved as fancy_figure.m
    function [figure_handle]= fancy_figure(action,figure_handle,...
        save_name,save_format,fontsize_manual,linewidth_manual)

windows 7 tested and matlab R2014a

    %%Function code for plotting full screen figure and do this on second monitor if present.
    % If the 'action' input argument equals 'save' the figure will be saved
    % with the settings requested.
    switch action
        case 'open'
            %%Open a figure on full screen and on the second monitor if present.
            % Format of monitor_positions in pixels: [xMin yMin xMax yMax]
            mon_pos = get(0,'MonitorPositions');                       
            size_monitor = size(mon_pos);
            if (size_monitor(1) > 1)
                figure_handle = figure('Position', [mon_pos(2,1:2) 50 50]);
                pause(0.1);
                set(get(handle(gcf),'JavaFrame'),'Maximized',1);       
            else
                figure_handle=figure;
                pause(0.01);
                set(get(handle(gcf),'JavaFrame'),'Maximized',1);
            end
            % Fontsize used at the figure
            if ~exist('fontsize_manual','var')|| isempty(fontsize_manual)
                set(gca,'FontSize',16)
                set(gca,'FontName','Dotum')
            else
                set(gca,'Fontsize',fontsize_manual)
                set(gca,'FontName','Dotum')
            end

Ruben 2014-12-4

That was indeed the kind of code badness I expected that would give the 'strange' result and I slowly get your explanation. Maybe I have some time left this weekend XD

Do you get the point, what I want to reach with this function? If yes, do you have a smart idea or can you explain short what I maybe can do better, more careful etc?

dpb 2014-12-4

编辑：dpb 2014-12-6

在 MATLAB Online 中打开

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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Answer 2

Robert Cumming 2014-12-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/165149-how-to-change-the-linewidth-in-a-figure-before-actually-plotting-some#answer_161147

在 MATLAB Online 中打开

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).

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Ruben 2014-12-3

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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