How to get mouse coordinates in GUI (AppDesigner) ?

Question

Mohit Kumar 2020-10-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/603649-how-to-get-mouse-coordinates-in-gui-appdesigner

评论： Ameer Hamza 2020-10-8

I am using MATLAB App Designer and have inserted axes into the app.

When the user clicks a button, I want them to be able to then select a point on the axes. Basically, the functionality should be identical to ginput.

How should I do this? I am aware that related questions have been asked but am honestly not able to understand parts of those or the solutions don't seem to work well. It looks to be something to do with using ButtonDownFcn callback and CurrentPosition but I'm not able to understand how to use these.

Thanks for your help!

Mohit.

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Answer 1

Ameer Hamza 2020-10-2

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https://ww2.mathworks.cn/matlabcentral/answers/603649-how-to-get-mouse-coordinates-in-gui-appdesigner#answer_503908

编辑：Ameer Hamza 2020-10-2

sample.mlapp

Check the attached app for the demo.

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Mohit Kumar 2020-10-5

编辑：Mohit Kumar 2020-10-8

在 MATLAB Online 中打开

ques.jpg

EDIT : My code seemed to not be working because I was using tabs in my app. Removing the tabs made the code work just fine. Most weird.

Hi Ameer, thanks for the answer. It works perfectly in the app that you sent. However, when I implement it in my code, the Y coordinate seems to be "shifted" by -3.5 coordinates. I've tried to explain this with the picture attached. Here is my code, I don't see anything wrong with it...

% The function for ButtonPushedFcn
function fixed_pts_guess(app,ax,eve)
    x_pt = ax.CurrentPoint(1,1); 
    y_pt = ax.CurrentPoint(1,2);
    app.FixedPtsTextArea.Value=num2str([x_pt y_pt]);
end
% The callback function where the implementation happens
function GuessSolutionButtonValueChanged(app, event)
    value = app.GuessSolutionButton.Value;
    if value % If button is switched on
        app.FixedPointsAxes.ButtonDownFcn=@app.fixed_pts_guess;
    else
        app.FixedPointsAxes.ButtonDownFcn='';
    end
end