How to display rectangle ROI that was loaded from a file?

To be able to save and share figures for my app, I save user-drawn rectangles in a rectangle array and write that to a .mat file. Another user at a later time can import that rectangle array to display on a figure. I have the rectangle array imported properly to matlab, but how can I draw the rectangles from the rectangle array objects rather than the drawrectangle() function? Essentially, I want "drawrectanglefromfile" or "displayrect"

Thanks!

Answer 1

[Voss]

You can set the saved rectangles' parent to be a different/new axes.

Example:

% plot some rectangles:
xlim([0 1])
ylim([0 1])
R = [ ...
    rectangle('EdgeColor',[0 0.6 0  ],'Position',[0.2 0.1 0.7 0.6]) ...
    rectangle('EdgeColor',[0 0.2 0.8],'Position',[0.1 0.2 0.6 0.7]) ...
    ];

% save the rectangles to a mat file:
save('R.mat','R')

% load the mat file:
S = load('R.mat')

S = struct with fields:
    R: [1×2 Rectangle]

% put the loaded rectangles in a new axes in a new figure:
figure
ax = gca();
set(S.R,'Parent',ax);

[Alex]

Thanks again! :) You are the same person that helped me yesterday with the table editing

Do you know how I can write the parent for each object in the rectangle array in one line? I assume there has to be a better way than this, but the for loop below works:

for i=1:length(app.ROI_array)
    app.ROI_array(i).Parent = app.VisualModel;
end

I get an error when I try to write it like this:

app.ROI_array(:).Parent = app.VisualModel;

[Voss]

You're welcome!

Use the set function:

set(app.ROI_array,'Parent',app.VisualModel)