40 views (last 30 days)
Show older comments
alessandro marino on 23 Apr 2023
Commented: alessandro marino on 1 May 2023
Accepted Answer: Aditya Srikar
Hi,
I am trying to plot multiple items on the same plot, but I would like to implement a quick method to hide or show a single item, e.g. by clicking on it on the plot legend. I have tried with the clickable legend (as described here: https://www.mathworks.com/matlabcentral/fileexchange/21799-clickablelegend-interactive-highlighting-of-data-in-figures), but this functionality seems to be unsupported in more recent MATLAB releases. I have also tried to include a callback function (as in this example: https://blogs.mathworks.com/pick/2016/03/25/interactive-legend-in-r2016a/), again with no results.
Thanks in advance for your help
7 Comments Show 5 older commentsHide 5 older comments
Show 5 older commentsHide 5 older comments
dpb on 23 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2717363
Have you tried <the example in the doc> of precisely that functionality?
alessandro marino on 24 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2718348
I have, with no successful results
dpb on 24 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2718698
Show us a SMALL working example that illustrates the issue; while I haven't done it, it's hard to imagine the doc example doesn't work...which specific release are you using?
dpb on 24 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2718718
Edited: dpb on 24 Apr 2023
I dunno if can do this interactively here or not...
function hitcallback_ex1(src,evnt)
if strcmp(evnt.Peer.Visible,'on')
evnt.Peer.Visible = 'off';
else
evnt.Peer.Visible = 'on';
end
end
plot(rand(4));
l = legend('Line 1','Line 2','Line 3','Line 4');
l.ItemHitFcn = @hitcallback_ex1;
No, can't do that here, apparently; there's a whole lot about using this interface i've yet to learn/understand what can/cannot do...
Anyways, putting the above function into an m-file and executing the example code works as advertised here on R2020b...I presume it'll work on more recent releases as well...can toggle each and every line in the plot from the legend label associated...
alessandro marino on 24 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2718768
Hi @dpb,
Thanks a lot, I tried to copy your code and it works! it looks like simpe stuff, but it was my first time studying MATLAB functions, so thanks a lot for your help.
I noticed that, when hiding one function, the y-axis adjusts to maximise the window on the remaining functions. I added the ylim command this way:
plot(rand(4));
ylim("manual");
l = legend('Line 1','Line 2','Line 3','Line 4');
l.ItemHitFcn = @hitcallback_ex1;
Not sure if ther is a more elegant way of doing it, but it works so far.
Thanks a lot again
Davindra Usov on 25 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2719469
have you tried switch cases with a tiled layout. Search switch on matlab help
dpb on 25 Apr 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2719499
Edited: dpb on 25 Apr 2023
@Davindra Usov -- what's the issue you're raising? I don't follow; I just created a tiled layout and put a legend on each of two axes/tiles and assigned the above callback function to each. Both work as advertised with no need to do anything else...
% from example for tiledlayout...
x = linspace(0,30);
y1 = sin(x/2);
y2 = sin(x/3);
y3 = sin(x/4);
% Plot into first tile twice... (doc does three, but two's plenty to illustrate)
tiledlayout('flow')
nexttile
plot(x,y1)
hLg(1)=legend('Y1'); % add a legend; save the handle...
nexttile
plot(x,y2)
hLg(2)=legend('Y2'); % add a legend; save the handle...
hLg(1).ItemHitFcn = @hitcallback_ex1;
hLg(2).ItemHitFcn = @hitcallback_ex1;
After this, clicking on the legend entry in each toggles visibility of each as expected...
set(hLg,{'ItemHitFcn'},{@hitcallback_ex1})
is a more elegant syntax to set all handles to the one callback function.
Sign in to comment.
Sign in to answer this question.
Accepted Answer
Aditya Srikar on 28 Apr 2023
Edited: Aditya Srikar on 28 Apr 2023
Hi Alessandro
You can modify legend properties to control the appearance and behaviour of a Legend object. By changing each property, you can modify certain aspects of the legend.
Consider the following example
plot(rand(3))
lgd = legend('a','b','c');
c = lgd.TextColor;
lgd.TextColor = 'red';
In the above example, the text color of legend is set to red.
To toggle visibility of legend on click event, you can use the property ItemHitFcn, which associates a callback function to legend and the callback function executes when you click legend items.
Refer the documentation for more details :
https://in.mathworks.com/help/matlab/ref/matlab.graphics.illustration.legend-properties.html
Hope it helps !
1 Comment Show -1 older commentsHide -1 older comments
Show -1 older commentsHide -1 older comments
alessandro marino on 1 May 2023
Direct link to this comment
https://www-ah.mathworks.com/matlabcentral/answers/1951673-how-can-i-use-a-plot-legend-to-toggle-an-element-s-visibility#comment_2727824
Thank you @Aditya Srikar, this helped, together with this comment by @dpb
Thank you all
Sign in to comment.
More Answers (0)
Sign in to answer this question.
See Also
Categories
MATLABGraphicsFormatting and AnnotationLabels and AnnotationsLegend
Find more on Legend in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
An Error Occurred
Unable to complete the action because of changes made to the page. Reload the page to see its updated state.
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- Deutsch
- English
- Français
- United Kingdom(English)
Asia Pacific
- Australia (English)
- India (English)
- New Zealand (English)
- 中国
- 日本Japanese (日本語)
- 한국Korean (한국어)
Contact your local office
