How do I add a draw rectangle function to an image app?

Kurt

2022 10 19

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I used App Designer to create a frame containing an image. Now I want to draw a rectangle inside that image. None of the examples I have seen describe how to do this in an object-oriented manner for Matlab 2022.

My main routine contains the following code:

scan = sky_frame;            % draw the background .gif image
value = [20 20 30 50];       % define the rectangle coordinates
scan.drawRect(value);        % call the drawRect function in sky_frame to draw the rectangle

The sky_frame class is defined as follows:

classdef sky_frame < matlab.apps.appBase
    properties(Access = public)
        etc.
    end
    % callbacks
    methods(Access = Public)
        function drawrect(value)
            rectangle('Position',value);
        end
    end

When I run this, the .gif image appears, but "rectangle" creates a new figure on the desktop, outside my original sky_frame object. How do I force the code to draw the rectangle inside the sky_frame object at the coordinates specified?

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Eric Delgado 2022-10-20

编辑：Eric Delgado 2022-10-20

在 MATLAB Online 中打开

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MATLAB.zip

Hey... you have to show your image in an uiaxes and create a handle to your ROI as property of the app, so you can draw your ROI and change it later. See app attached. Hope it's helpful! :)

% Image button callback
function ImageButtonPushed(app, event)            
    [file, path] = uigetfile({'*.png'; '*.jpg'; '*.jpeg'});
    figure(app.UIFigure)
    if ~isempty(file)
        try
            imshow(fullfile(path, file), 'Parent', app.UIAxes)
        catch ME
            uialert(app.UIFigure, ME.message, 'error', 'Icon', 'error')
        end
    end
end
% Rectangle button callback
function RectangleButtonPushed(app, event)    
    app.roi = drawrectangle(app.UIAxes);
end