Fixed-size text that zooms/scales with a plot?
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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
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Kye Taylor
le 24 Avr 2013
Modifié(e) : Kye Taylor
le 24 Avr 2013
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
2 commentaires
Walter Roberson
le 25 Avr 2013
I think I saw somewhere that you can add a listener to detect this, but I do not know how one would figure out what the event would be.
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Walter Roberson
le 24 Avr 2013
zoom PostAction callback, detect the current axis xlim and ylim, decide on a scaling, and set() the text FontSize appropriately (might as well only do it for the objects that are visible.)
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