Accessing ROI objects in GUIDE

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John D 2019-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/492641-accessing-roi-objects-in-guide

评论： John D 2019-11-23

采纳的回答： Adam Danz

在 MATLAB Online 中打开

I'm allowing the user to create a series of line ROIs like so, using a GUIDE app pushbutton:

function pushbuttonline_Callback(hObject, eventdata, handles)
% hObject    handle to linebtn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
h = drawline(handles.axes1);

But how can I access these later on in the code?

I was thinking of placing the drawline variables in a global array, but is there a better way of doing this?

Also, if the user deleted a line using the GUI, would the line variable also be removed?

Thanks in advance.

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采纳的回答

Adam Danz 2019-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/492641-accessing-roi-objects-in-guide#answer_402864

编辑：Adam Danz 2019-11-22

在 MATLAB Online 中打开

This demo works outside of your GUI callback but it will be easy to implement it into your GUI. See inline comments for details.

% Create axes (your gui will already have axes)
handles.axes1 = axes(); 
% Draw 3 lines (your gui will only have 1 of these lines 
% but it's important to add the 'Tag' to your line.
% The tag name should be something unique - I chose 'userLine'. 
h = drawline(handles.axes1,'Tag','userLine'); 
h = drawline(handles.axes1,'Tag','userLine'); 
h = drawline(handles.axes1,'Tag','userLine'); 
% Later on from any other callback function that has 
% access to 'handles', you can find all objects in 
% your axes that has that tag.  If 'lineHandles' is
% empty, no objects were found with that tag. Otherwise
% 'lineHandles' will contain all of the handles to your
% ROI lines.
lineHandles = findobj(handles.axes1,'Tag','userLine')