Controlling the size of legend markers separately from the font size of legend labels

Question

z8080 2020-2-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503622-controlling-the-size-of-legend-markers-separately-from-the-font-size-of-legend-labels

评论： Francesco Bernardini 2023-7-21

I need to control the markers in my legend separately from the font size of the legends' labels. Inspired by this previous answer, I used this code, in Matlab 2016a:

    x = 1:10;
    plot(x, 1*x, 'o')
    hold on
    plot(x, 2*x, 's')
    h_legend = legend({'one','two'});
    objhl = findobj(h_legend, 'type', 'line'); % objects of legend of type patch
    set(objhl, 'Markersize', 99); % set marker size as desired

Funnily enough, this solution worked for me for a few plots. However, after a while, now whatever I type in place of the 99, makes no difference. If I change the 'line' into 'patch, that also makes no difference. The problem I guess comes from the fact that objhl is actually empty:

    >> objhl = findobj(h_legend, 'type', 'patch')
    objhl = 
      0x0 empty GraphicsPlaceholder array.

Any thoughts? Many thanks!

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Answer 1

Subhadeep Koley 2020-2-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503622-controlling-the-size-of-legend-markers-separately-from-the-font-size-of-legend-labels#answer_413768

在 MATLAB Online 中打开

A new MATLAB graphics system is introduced from MATLAB R2014b onwards. Your code will work for the older system I guess.

Use the code below if you are using MATLAB R2014b or later.

clc; close all;
x = 1:10;
plot(x, 1*x, 'o');
hold on;
plot(x, 2*x, 's');
[~, objh] = legend({'one','two'}); % Instead of "h_legend" use "[~, objh]"
objhl = findobj(objh, 'type', 'line');
set(objhl, 'Markersize', 15);

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z8080 2020-2-5

Thank you Subhadeep!

Adam Danz 2020-2-6

Note that since r2018b only the first output of the legend function is documented. Archived documentation for the legend function from r2016a to r2018a suggests avoiding the use of the outputs other than the first output:

Note: This syntax is not recommended and creates a legend that does not support all graphics features. Use the l = legend(__) syntax to return the legend object and set Legend Properties instead.

For example, if the first and second outputs to legend() are both included, it interferes with the ability to change the fontsize of the legend text.

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