What property of a line is related to the transparency / opacity or alpha of a line?

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Robbin van Hoek on 14 Oct 2020

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Commented: Ameer Hamza on 17 Oct 2020

Accepted Answer: Ameer Hamza

when i plot a line with transparency by means of rgba color triplet and opacity.

hline = plot(x,y,'color',[1,0,0,0.5])

What property of the resulting handle is changed? I cannot find anything in the color triplet, nor can i find a seperate property like 'Alpha' or 'FaceAlpha' or anything similar.

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Ameer Hamza on 14 Oct 2020

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Edited: Ameer Hamza on 14 Oct 2020

This is an undocumented feature in MATLAB: http://undocumentedmatlab.com/articles/plot-line-transparency-and-color-gradient

You can access the alpha value using this line

alpha_val = hline.Edge.get.ColorData(4)

It is in uint8, you can convert to double

alpha_val = double(hline.Edge.get.ColorData(4))/255

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Robbin van Hoek on 17 Oct 2020

Thank you!

Ameer Hamza on 17 Oct 2020

I am glad to be of help!

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