How to get Greek letters in text in an IMAGE using Inserttext?

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Steven 2016-6-13

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回答： Walter Roberson 2016-6-14

Hi I want to use text with Greek letter in an image (use text as part of the image) using "Inserttext" as suggested by Mathworks. But I cannot get Greek letters there, since Interpreter (latex) is not one of this function's properties. What can I do? This is the code I use (I have to use sprintf):

imgOut = insertText(imgOut, [10 100], sprintf(['a=' num2str(i,'%0.4f \alpha') ],i))

Note: I tried \alpha or \\alpha but it did not work either. Thank you.

Steven

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Answer 1

Walter Roberson 2016-6-14

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You will need to render the character to a file or to an array, and then insert that array into the image.

Up to and including R2014a (but not later), you can work like this. Caution: this uses some magic smoke to do the job!

%use the decimal unicode character number, but only a subset is supported
%the use of HTML is documented magic... documented somewhere or other
%but you have to be aware it does not work for edit or text uicontrols
h = uicontrol('style', 'push', 'String', '<HTML>&#945;');
%now shrink the size to just what is needed to contain the letter
%there is some slinky stuff about Extent working differently on different operating systems
%so you might need to fiddle a bit.
set(h, 'Position', get(h, 'Extent'));
%now use twice-magic incantations to render the uicontrol to an array
alpha_img = getPrintImage(handle(h));

Now you can store alpha_img as needed into the image you are building up.

If you do this for a number of different characters, you can re-use the same uicontrol and set its String differently. You should expect that the Extent will vary from character to character if you are using a proportional font.