How to count data cursors and assign a fixed number to each?

Question

KMC 2016-6-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289252-how-to-count-data-cursors-and-assign-a-fixed-number-to-each

评论： Samuli Karvinen 2020-1-15

Dear all,

I had some code that worked relatively well on previous versions of Matlab (see below). Basically, I was using a custom data cursor function where I could count the number of cursors on the plot and each cursor had its own identifying number (for three cursors on the plot, I knew how many there were and each one was numbered 1 to 3 according to the order of creation. This was great, as I could then move a given data cursor around and it would not change the identifying number.

After I updated to 2016a it is not working anymore. Specifically, instead of keeping one number for each cursor, now it increases the number every time I move a given cursor around.

Does any one know what changed in this version that made it not work anymore, and how can I restore this function?

function txt = AddC(~,event_obj)
% Customizes text of data tips
% event_obj    Handle to event object
% output_txt   Data cursor text string (string or cell array of strings).
persistent datatip_objects % handles to the datatips on the graph
n = numel(datatip_objects);
found_match = 0;
count = 0;
%Look for the current datatip in our list of known datatips
while ~found_match && count < n
    count = count+1;
    found_match = (event_obj == datatip_objects{count});
end
if found_match;
else
    datatip_objects{n+1} = event_obj; %this datatip is new, store its handle
end
    uicontrol('Style','text','Units','normalized','Position',...
    [0.79 0.90 0.2 0.05],'String', ['Cell number: ' num2str(count)],...
    'FontUnits','normalized','FontSize',0.8)
      uicontrol('Style','text','Units','normalized','Position',...
      [0.79 0.95 0.2 0.05],'String', ['Number of cells: ' num2str(n)],...
      'FontUnits','normalized','FontSize',0.8)
pos = get(event_obj,'Position');      
txt = {['X: ',num2str(pos(1))],...
       ['Y: ',num2str(pos(2))],...
       ['N: ',num2str(count+1)]};
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Joseph Cheng 2016-6-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289252-how-to-count-data-cursors-and-assign-a-fixed-number-to-each#answer_225128

编辑：Joseph Cheng 2016-6-10

在 MATLAB Online 中打开

you can change things around and use something like this:

hfig = figure;plot(1:10,[1:10].^2)
hcursor = datacursormode(hfig)
%pause here to add data points
getCursorInfo(hcursor);

not knowing how you're envoking your function i would have it changed to just query all the data points that show up instead. newest data points will be added to first index position shifting everything to the right. you can keep your persistance since you know that if you move it it'll update the value so you can check to see which one moved or was added.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

KMC 2016-6-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/289252-how-to-count-data-cursors-and-assign-a-fixed-number-to-each#answer_225133

Dear Joseph,

Yeah, I evoke the function using a very similar code, and it still retains its order in the cursor_info vector, but the issue is that I want to see the numbering of the data cursors as I'm adding them (I need to add a few dozen data points and it can get confusing is I can't tell them apart), so it doesn't really solve the problem.

Thanks for replying though. I also tried to see if I could invoke the cursor_info vector interactively during the point adding, but couldn't get that to work really.