Can I change the color of the label in xline / yline to be different from the color of the line?

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Michael Mazack 2023-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/2019591-can-i-change-the-color-of-the-label-in-xline-yline-to-be-different-from-the-color-of-the-line

评论： Adam Danz 2023-9-11

采纳的回答： Dyuman Joshi

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I want the label color (i.e., of the text) to be a different color than the line color in xline and/or yline.

Is there an easy way to do this without the workaround below?

xline(5, '-', 'Text');
hold on;
xline(5, '-g');
hold off;

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VINAYAK LUHA 2023-9-11

编辑：VINAYAK LUHA 2023-9-11

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Hi Michael,

Instead of plotting the same line twice, you can plot the line once followed by the text as shown below -

xline(5, '-g');

hold on;

text(5, 0, 'Text', 'Color', 'red', 'HorizontalAlignment', 'right', 'VerticalAlignment', 'bottom');

hold off;

Dyuman Joshi 2023-9-11

I believe the above method is tedious for OP's liking.

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采纳的回答

Dyuman Joshi 2023-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/2019591-can-i-change-the-color-of-the-label-in-xline-yline-to-be-different-from-the-color-of-the-line#answer_1307351

Unfortunately, No, there is no property "Label color" for xline and yline functions (Constant Line Annotation) which can be modified.

Also, you don't need to use hold for xline() and yline().

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Michael Mazack 2023-9-11

Thanks, Steven -- very helpful suggestion.

The need is to make xlines and ylines -- which may obscure the data and blank space -- have lower contrast with the plot background color while having the label of the line have high contrast so the viewer can easily read it.

I have submitted an enhancement request at the link you provided with more user story detail. Thank you.

Adam Danz 2023-9-11

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> The need is to make xlines and ylines...have lower contrast with the plot background color while having the label of the line have high contrast so the viewer can easily read it.

To achieve that, lower the Alpha value of the ConstantLine objects. This won't affect the label.

plot(peaks,'k-')

xline(10,'-k','Default Alpha')

xline([20:10:40], '-k', 'Lower alpha','Alpha',0.2)