How to enable the data tip interaction functionality when using a custom "ButtonDownFcn" in MATLAB R2023a?

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MathWorks Support Team on 22 Mar 2024

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Edited: MathWorks Support Team on 26 Mar 2024

I am using MATLAB R2023a, and I have a custom "ButtonDownFcn" to display the point clicked in the plot.

x = linspace(0,2*pi,100);
y = sin(x);
p = plot(x,y);
xlabel('x');
ylabel('sin(x)');
% Custom ButtonDownFcn to display point clicked
set(p,'ButtonDownFcn',{@buttondownfcn}); 
function buttondownfcn(~,event)
    pts = event.IntersectionPoint(1:2);
    disp(pts);
end

However, I notice that when using a custom "ButtonDownFcn", I no longer have the default interactivity of a plot (e.g., displaying data tip upon hovering, etc.). How can I enable the data tip interaction functionality when using a custom "ButtonDownFcn"?

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Answer 1

MathWorks Support Team on 26 Mar 2024

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https://uk.mathworks.com/matlabcentral/answers/2099151-how-to-enable-the-data-tip-interaction-functionality-when-using-a-custom-buttondownfcn-in-matlab-r#answer_1431396

Edited: MathWorks Support Team on 26 Mar 2024

Currently, the "ButtonDownFcn" callback does not have the functionality to enable data tip interaction. To enable the data tip interaction functionality in MATLAB R2023a, consider using the "Hit" event instead of a "ButtonDownFcn". Please see the following code snippet for an example.

x = linspace(0,2*pi,100);
y = sin(x);
p = plot(x,y);
xlabel('x');
ylabel('sin(x)');
% Add a Hit event listener
addlistener(p,'Hit',@(src,event)buttondownfcn(src,event));
function buttondownfcn(~,event)
    pts = event.IntersectionPoint(1:2);
    disp(pts);
end