Select lines on a surf plot and output indices

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Butterflyfish
Butterflyfish on 16 Nov 2021
Commented: Butterflyfish on 16 Nov 2021
I have a plot (spectrogram) on which I added some lines. I would like to select some of these lines directly on the plot with the mouse and output the index of each selected line.
Here is part of my script for the plot
figure
hold on
H(1) = surf(t,f,20*log10(abs(s)),'EdgeColor', 'none');
axis xy; axis tight;
colormap(jet); view(0,90);
xlabel('Time (secs)');
colorbar;
ylabel('Frequency(Hz)');
% Add lines
ipt_sec = t(ipt); % Indices to seconds
for i = 1:numel(ipt_sec)
y = ylim;
H(i)= plot([ipt_sec(i),ipt_sec(i)],[y(1) y(2)], 'LineWidth', 2, 'Color', 'k');
end
set(H, 'ButtonDownFcn', {@LineSelected, H})
function LineSelected(ObjectH, EventData, H)
set(ObjectH, 'LineWidth', 4);
set(H(H ~= ObjectH), 'LineWidth', 2);
end
I would like to be able to select multiple lines (instead of just one in the script above) and output each of their index.
Any help greatly appreciated, thank you!

Answers (1)

KSSV
KSSV on 16 Nov 2021
Edited: KSSV on 16 Nov 2021
Just use
surf(20*log10(abs(s)),'EdgeColor', 'k')
Use getpts or ginput or daatip, this will give you location/ index where you have clicked on the plot. It has (i,j) r (row,column). Now you can use t(r,:) or t(:c) etc.
But why you want to click on the plot? You can use ==, <=, >= etc to get what you want.
  3 Comments
Butterflyfish
Butterflyfish on 16 Nov 2021
Thanks, I have edited my question for more precisions. The function 'ButtonDownFcn' seems to work but I don't understand completely how it works, how to select multiple lines and output the indices.

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