MATLAB: Fixed-size text that zooms/scales with a plot

MATLABplottext;zoom

When I add text to a plot using the text() command, it appears at a fixed size, and doesn't change as I zoom into the figure. For example, if I draw a rectangle with text inside it, and zoom out until the rectangle is small, the text stays the same size, and thus us now huge compared to the rectangle. I'd like text that stays put inside the rectangle. I guess this is essentially "rendering" text into a plot.
Is there a way in Matlab or something in the user community that can accomplish this? I have searched and haven't found it yet.
Many thanks. Ken

Best Answer

Here's a cute little function that does what you're looking for.
function textWithZoomEffect
    % plot some original data
    t = linspace(0,2*pi);
    x = sin(t);
    plot(t,x)
    % get axes size
    axis([0,2*pi,-1.5,1.5]);
    ax = axis;
    % add some text
    txt = text(pi/2,1,'Max','fontsize',40/(ax(4)-ax(3)));
    h = zoom; % get handle to zoom utility
    set(h,'ActionPostCallback',@zoomCallBack);
    set(h,'Enable','on');
    % everytime you zoom in, this function is executed
    function zoomCallBack(~, evd)      
        % Since i expect to zoom in ax(4)-ax(3) gets smaller, so fontsize
        % gets bigger.
        ax = axis(evd.Axes); % get axis size
        % change font size accordingly      
        set(txt,'FontSize',40/(ax(4)-ax(3))); 
    end
end
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