How can I prevent a function from creating a separate window when acting on a UIfigure handle?

Question

Andrew Morris 2023-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/2004807-how-can-i-prevent-a-function-from-creating-a-separate-window-when-acting-on-a-uifigure-handle

评论： Andrew Morris 2023-8-4

I have a script that reads in some data and a UI figure with uibuttons that change how it is plotted. I've stripped the non-essential parts that don't relate to the issue out of the code. This SHOULD create a UI window that has 2 UI slider elements and a push putton that reads the current value of the sliders and uses that to plot data in the same figure to an axes inside the window on the right created by UIaxes. It will plot the data as intended, BUT it also creates a new figure window with a blank axes in it when the "update" button is pressed. How do i get it to stop doing this? If the plot() function is called outside of a local function it will plot to the correct axes, but I need it to be inside the update function so that it can replot when UI elements are changed.

% some mock data to make the simplified code run
raw_spectra.ampl = [1 2 3];
raw_spectra.field = [1 2 3];
% make the uifigure and axes
fig = uifigure("Position", [50, 300, 1200, 900]);
Error using matlab.internal.lang.capability.Capability.require
This functionality is not available on remote platforms.

Error in matlab.ui.internal.uifigureImpl (line 32)
  Capability.require(Capability.WebWindow); 

Error in uifigure (line 26)
window = matlab.ui.internal.uifigureImpl(varargin{:});
ax = uiaxes(fig,'Position',[350, 40, 820, 820]);
% make an element in the uifigure that adjusts a parameter that affects how
% plotting is done.
fig.UserData.horizStagger = uislider(fig,"Limits",[0 7],"Position",[30, 250, 200 3],...
        'Value', 0);
fig.UserData.vertStagger = uislider(fig,"Limits",[0 3],"Position",[30, 170, 200 3],...
        'Value', 0.5);
% a ui button element that when pushed, plots or replots the data with the 
% parameters selected with the other UI elements
update_btn = uibutton(fig, 'push', 'Position', [130, 450, 125, 22], ...
    'Text', 'Update', 'ButtonPushedFcn', ...
    @(update_btn, event) update(update_btn, fig, raw_spectra));
function update ( ~, fig, raw_spectra)        
    
    staggeredSpectra = stagger(raw_spectra, fig.UserData.horizStagger.Value, ...
        fig.UserData.vertStagger.Value);
    
       
    for i =1:numel(staggeredSpectra)
        plot(fig.Children(end), staggeredSpectra(i).field, ...
            staggeredSpectra(i).ampl);
        hold on;
    end
    hold off;
end
function spectra  = stagger (input_spectra, horizStagger, vertStagger)
    for s = 1:numel(input_spectra)
        %adjust center so that that maxima line up with staggering added for
        %horizontal offset 
   
        spectra(s).field = input_spectra(s).field + horizStagger;
        %scale relative to the largest spectrum height and apply vertical
        %offset
        spectra(s).ampl = input_spectra(s).ampl * vertStagger * (s-1);
    end
end

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Voss 2023-8-4

@Andrew Morris: Have you tried the modification given in my answer? I ran it, and it worked (version R2022a).

Andrew Morris 2023-8-4

yes! thank you. it requires making the plot first in this way outside of a function and then using the update callback to swap out the ax.Children.XData and ax.Children.YData vectors in place without using the plot function.

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