use "set" with trasparent color

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shamal
shamal 2025-6-6
评论： Walter Roberson 2025-6-7
selected = findobj(allLines,'Type','line','LineWidth',0.5);
set(selected, 'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2);
Error using matlab.graphics.chart.primitive.Line/set
Unrecognized property MarkerFaceAlpha for class Line.
Error in mycallback (line 19)
set(selected, 'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2);
Error while evaluating Line ButtonDown
Hi, i try to color in trasparente mode but i get error

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采纳的回答

Matt J
Matt J 2025-6-7
编辑：Matt J 2025-6-7
Ran in:
It's undocumented, I believe, but you can control line transparency by setting the Color property to a 4-element RGBA value.
h=plot(rand(5,2),'r', 'LineWidth',4);
set(h(2),'Color',[1,0,0, 0.2]);
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Matt J
Matt J 2025-6-7
编辑：Matt J 2025-6-7
What I gave you in my example does precisely that. Both lines in the plot are red, but the second line has transparency alpha=0.2. That's what a transparent red line looks like (on a white background).
Walter Roberson
Walter Roberson 2025-6-7
Note:
If you serialize a plot (such as save and restore, or send it between parallel workers), then the transparancy set in this manner will be discarded.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2025-6-7
Line objects have never supported MarkerFaceAlpha or MarkerEdgeAlpha
MarkerFaceAlpha and MarkerEdgeAlpha are used for Scatter plots.
  1 个评论
shamal
shamal 2025-6-7
What do you recommend to make the plotted lines more transparent without changing the color?

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