Way to get handle to just brushed object?

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David Goldsmith 2011-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/5539-way-to-get-handle-to-just-brushed-object

Hi! I have a method which catches the windowButtonUp event when brushing. I'd like to use the handle to the plot object (i.e., not the axes it's a child of, but the line or surface object itself) that was just brushed, but I can't find how to retrieve it. I wrote some code to try to do it, but it behaves inconsistently; before I try further to debug it, I'd like to know that I'm not re-inventing the wheel: is there a convenient way of retrieving the handle to a just-brushed object? Thanks!

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Answer 1

Sarah Wait Zaranek 2011-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/5539-way-to-get-handle-to-just-brushed-object#answer_8699

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Not sure if this is what you are doing or not, but this seems to work for me. It works very nicely on lines (at least in my limited testing)

% find all objects with the property BrushData
 hB = findobj(gcf,'-property','BrushData');
% extract the brush data
data = get(hB,'BrushData');
% find objects where BrushData is not all zeros (i.e. you have some points "brushed").  Note: this probably could be written in a cleaner fashion, but it shows you the idea.  Then, index back into your list of objects and get the ones that were "brushed"
brushObj = hB(find(cellfun(@(x) sum(x),data)))