MATLAB: How do you set the focus to a specific uiaxes

appdesignerguiMATLABplotuiaxesuifigure

I am designing an app with the new App Designer format and would like to be able to set the focus of my uifigure to draw on a specific set of uiaxes when I activate a particular callback.

When I attempt to target the axis for plotting using

axes(app.UIAxes)

I get the following error:

Error using axes
Functionality not supported with figures created with the uifigure function.

And calling:

uiaxes(app.UIAxes)

yields:

Error using uiaxes (line 32)
UIAxes cannot be a child of UIAxes.

Is it possible to set the current axes/panel of a uifigure object via their handle? How do I go back add a plot to uiaxes after having created them and subsequently edited other components on the uifigure?

Best Answer

I would recommend using the plot(ax,___) syntax.

" plot(ax,___) creates the line in the axes specified by ax instead of in the current axes (gca). The option ax can precede any of the input argument combinations in the previous syntaxes."

What I typically do is create a startup function that generates the initial plot

function startupFcn(app)
   ...
   app.p1 = plot(app.UIAxes,x,y1)
   ...
end

Then, when I want to update my line, my app just updates the XData and YData properties of app.p1

% Update line
app.p1.XData = x_new;
app.p1.YData = y1_new;

Of course, this all depends on what type of plot you want to create.

BTW, startup function is a callback of the app canvas. See this page for how to add/create it.

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x = 1:10;
y = sin(x);
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Hi,

Folllowing is the code and app design

classdef app1 < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure  matlab.ui.Figure
        UIAxes    matlab.ui.control.UIAxes
        UIAxes2   matlab.ui.control.UIAxes
        Button    matlab.ui.control.Button
    end
    
    properties (Access = public)
        cam;
    end
    
    % Callbacks that handle component events
    methods (Access = private)
        % Code that executes after component creation
        function startupFcn(app)
            app.UIAxes2.Visible = 'off';
            evalin("base", 'clear cam');
            app.cam = webcam;
            frame = snapshot(app.cam);
            im = image(app.UIAxes, zeros(size(frame), 'uint8'));
            axis(app.UIAxes, 'image');
            preview(app.cam, im);
        end
        % Button pushed function: Button
        function ButtonPushed(app, event)
            img = snapshot(app.cam);
            image(app.UIAxes2, img);
            app.UIAxes2.Visible = 'off';
        end
    end
    % Component initialization
    methods (Access = private)
        % Create UIFigure and components

        function createComponents(app)
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Title')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            app.UIAxes.Position = [26 270 300 185];
            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.UIFigure);
            title(app.UIAxes2, 'Title')
            xlabel(app.UIAxes2, 'X')
            ylabel(app.UIAxes2, 'Y')
            app.UIAxes2.Position = [25 43 300 185];
            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [447 249 100 22];
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = app1
            % Create UIFigure and components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            % Execute the startup function
            runStartupFcn(app, @startupFcn)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Error you are facing instantiates that the code is not able to access the camera object at that instant.

Hope it helps!!

Best Answer

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