How can I set the transparency of LINE objects in MATLAB 7.14 (R2012a)?

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MathWorks Support Team 2012-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/103074-how-can-i-set-the-transparency-of-line-objects-in-matlab-7-14-r2012a

评论： Star Strider 2022-8-3

I would like to set the transparency of LINE objects in my figures. I use the ALPHA command to set the transparency of objects in my figure. However, LINE objects do not respect ALPHA values even though I am using the OPENGL renderer.

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Answer 1

MathWorks Support Team 2012-6-25

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Line series objects do not support transparency (alpha) values. The following workaround can be used to overcome this limitation:

1. Please refer to the following MATLAB Central link:

http://www.mathworks.com/matlabcentral/fileexchange/36953-patchline/content/patchline.m

2. The above function can be used to introduce transparency in LINE objects as follows:

EXAMPLE 1:

n = 10;
xs = rand(n,1);
ys = rand(n,1);
zs = rand(n,1)*3;
plot3(xs,ys,zs,'r.')
xlabel('x');ylabel('y');zlabel('z');
p  = patchline(xs,ys,zs,'linestyle','--','edgecolor','g','linewidth',3,'edgealpha',0.2);

EXAMPLE 2:

t = 0:pi/64:4*pi;
p(1) = patchline(t,sin(t),'edgecolor','b','linewidth',2,'edgealpha',0.5);
p(2) = patchline(t,cos(t),'edgecolor','r','linewidth',2,'edgealpha',0.5);
l = legend('sine(t)','cosine(t)');
tmp = sort(findobj(l,'type','patch'));
for ii = 1:numel(tmp)
      set(tmp(ii),'facecolor',get(p(ii),'edgecolor'),'facealpha',get(p(ii),'edgealpha'),'edgecolor','none')
end

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Walter Roberson 2019-11-6

Karl Oskar Pires Bjørgen comments,

This is not the simplest approach, check fabian's answer below

Walter Roberson 2019-11-6

The question is specifically about R2012a, at which time the functionality described by Fabian did not exist.

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Answer 2

Fabian 2015-7-31

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在 MATLAB Online 中打开

you could try setting a four-element vector for the color property of the line. works for me in 2014 b.

lh.Color=[0,0,0,0.5]

with lh handle to the line, producing a black line with transparency 0.5

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DGM 2022-8-3

I can't test anything beyond R2019b, but undocumented features are subject to change without notice; after all, if there's no documentation, the changes aren't documented either.