how to extract cursor data to a variable ?

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Hugo Trentesaux 2018-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/408991-how-to-extract-cursor-data-to-a-variable

编辑： Rachid Belaroussi 2021-3-4

The matlab doc gives a way to manually Export Cursor Data to Workspace. Is there a function to do this automatically ? I would like to make computations on the cursor coordinates that the user drags in the plot (imshow).

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采纳的回答

Kojiro Saito 2018-7-10

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https://ww2.mathworks.cn/matlabcentral/answers/408991-how-to-extract-cursor-data-to-a-variable#answer_328158

在 MATLAB Online 中打开

datacursormode and getCursorInfo will be a solution.

x = linspace(0,10,150);
y = cos(5*x);
fig = figure;
plot(x,y,'Color',[0,0.7,0.9])
title('2-D Line Plot')
xlabel('x')
ylabel('cos(5x)')
% Enable data cursor mode
datacursormode on
dcm_obj = datacursormode(fig);
% Set update function
set(dcm_obj,'UpdateFcn',@myupdatefcn)
% Wait while the user to click
disp('Click line to display a data tip, then press "Return"')
pause 
% Export cursor to workspace
info_struct = getCursorInfo(dcm_obj);
if isfield(info_struct, 'Position')
  disp('Clicked positioin is')
  disp(info_struct.Position)
end
function output_txt = myupdatefcn(~,event_obj)
  % ~            Currently not used (empty)
  % event_obj    Object containing event data structure
  % output_txt   Data cursor text
  pos = get(event_obj, 'Position');
  output_txt = {['x: ' num2str(pos(1))], ['y: ' num2str(pos(2))]};
end