MATLAB: How to get mouse coordinates in GUI (AppDesigner)

app designerguiMATLABmouse input

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.

Best Answer

Check the attached app for the demo.

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MATLAB: Adding Second Callback to UIAxes Toolbar in App Designer

First, thanks for the interesting topic (+1).

Here's a simpler way of issuing multiple actions when pressing the Restore toolbar button without hard coding the original callback function which is undocumented, hidden in p-code, and liable to change in the future.

Get the handle to the Restore button in the axes' toolbar.
Capture and store the original callback function.
Overwrite the buttons' callback function by defining a new function where you can execute the original callback function plus do anything else you want. This demo merely shows a uialert to confirm that the axes are restored.

Tested in r2020b and r2021a.

app.UIFig = uifigure(); 
app.UIAxes = uiaxes(app.UIFig); 
axTB = axtoolbar(app.UIAxes,'default'); 
isRestoreButton = strcmpi({axTB.Children.Icon},'restoreview');
if any(isRestoreButton)
    restoreButtonHandle = axTB.Children(isRestoreButton);
    originalRestoreFcn = restoreButtonHandle.ButtonPushedFcn;
    restoreButtonHandle.ButtonPushedFcn = {@myRestoreButtonCallbackFcn, originalRestoreFcn}; 
end
function myRestoreButtonCallbackFcn(hobj, event, originalCallback)
% Responds to pressing the restore button in the axes' toolbar. 
% originalCallback is a function handle to the original callback 
%   function for this button. 
    originalCallback(hobj,event) % Evaluate original callback
    fig = ancestor(event.Axes,'figure'); 
    uialert(fig,'Axes restored', 'RestoreButtonCallback', 'Icon', 'info');
end

MATLAB: How to retrieve intensities of a ROI in App Designer

See attached demos for masking.

Best Answer

Related Solutions

MATLAB: Adding Second Callback to UIAxes Toolbar in App Designer

MATLAB: How to retrieve intensities of a ROI in App Designer

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