How can I set the transparency of LINE objects in MATLAB 7.14 (R2012a)?
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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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MathWorks Support Team
2012년 6월 25일
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:
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
댓글 수: 2
Walter Roberson
2019년 11월 6일
Karl Oskar Pires Bjørgen comments,
This is not the simplest approach, check fabian's answer below
Walter Roberson
2019년 11월 6일
The question is specifically about R2012a, at which time the functionality described by Fabian did not exist.
추가 답변 (1개)
Fabian
2015년 7월 31일
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
2022년 8월 3일
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.
Star Strider
2022년 8월 3일
The 4-element colour vector seems to work in R2022a —
x = 0:0.01:2*pi;
y = sin(x);
figure
plot(x, y, '-', 'Color',[0.2 0.5 0.9 0.8], 'LineWidth',2.5) % Alpha = 0.8
hold on
plot(x, y+0.25, '-', 'Color',[0.2 0.5 0.9 0.2], 'LineWidth',2.5) % Alpha = 0.2
hold off
.
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