MATLAB: How to draw line with a mouse in the UI of the UIAxes in App Designer

Question

Using drawline() i have attached a callback function that allows a user to draw lines on the axes. Initially, clicking the button pops up a new window to carry out the drawing, and so I specified the axes: app.UIAxes. This does not seem to work, and I get the following error: "Error using images.roi.internal.ROI/parseInputs

ROI parent must be a valid Axes object.".

I am using R2019a of MATLAB.

Answer 1

It works fine in r2019b; there are quite a few limitations to UIAxes prior to r2019b which may be causing the problem.

        function ButtonPushed(app, event)
            
            % Draw line
            drawline(app.UIAxes)
            
        end