0 个投票

Is it possible to resize the y-axis automatically, so that my text always fits in the plot.
(as far as I can see, it is not clearly possible by using the "axis" and "ylim" functions)
Capture.PNG

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Walter Roberson
Walter Roberson 2019-12-9
Yes, it is possible. However, it is a nuisance at the best of times, and gets to be a pain if any text anywhere on your plot is using tex or latex interpreter.
It is a lot easier to just examine the current ylim() and make it a bit larger, such as giving an extra 5%. This simplistic solution does not take into account that there might be existing text that is notably off-screen: it makes no attempt to locate the text objects and figure out if they are visible and fontsize and vertical alignment and complications caused by tex or latex interpreters... but for the case you give the example for, making ylim just a bit larger is very likely to be good enough.
Davor Pavlovski
Davor Pavlovski 2019-12-9
yes I thought about that, but i just wondered if there is a cleaner way
Walter Roberson
Walter Roberson 2019-12-9
The only methods I can think of are not clean.

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Adam Danz
Adam Danz 2019-12-9
编辑：Adam Danz 2019-12-9

1 个投票

  1. Get the extent of the text objects after plotting the text.
  2. Add the vertical position and height to get the upper position of each text object
  3. Adjust the y axis limit so it contains all text objects.
h = text(1:numel(y),y,strsplit(num2str(y)),'VerticalAlignment','bottom');
ext = cell2mat(get(h,'Extent')); % Step 1
upperPosition = sum(ext(:,[2,4]),2); % Step 2
ylim([min(ylim()),max(max(ylim()),max(upperPosition))]) % step 3
The y limit will be adjusted so that it maintains its current lower limit and increases its upper limit only if there is text that exceeds the axis boundaries.
Result
[update]
That could be reduced to one line where h is the handle to the text output.
ylim([min(ylim()), max(max(ylim()),max(cellfun(@(x)sum(x([2,4])),get(h,'Extent'))))])
It could also be put into an anonymous function where the two inputs are h and ax which are the text handles and the axis handle.
fitText = @(ax,h)ylim(ax,[min(ylim(ax)), max(max(ylim(ax)),max(cellfun(@(x)sum(x([2,4])),get(h,'Extent'))))]);
fitText(gca,h)

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Adam Danz
Adam Danz 2019-12-9
The full code to produce the figure, text and y limits:
clf()
y = [1.6, 1.7, 2];
bar(y)
axis tight
h = text(1:numel(y),y,strsplit(num2str(y)),'VerticalAlignment','bottom');
ext = cell2mat(get(h,'Extent')); % Step 1
upperPosition = sum(ext(:,[2,4]),2); % Step 2
ylim([min(ylim()),max(max(ylim()),max(upperPosition))]) % step 3

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