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Topic: text positioning bug (converting units)
Replies: 2   Last Post: Jul 12, 2014 9:28 AM

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Paul Mennen

Posts: 281
Registered: 12/7/04
text positioning bug (converting units)
Posted: Jul 12, 2014 3:48 AM
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Is this a known bug?

>> axis
>> t = text(.8,.8,'abcd');
>> get(t,'position')


ans =
0.8000 0.8000 0

>> for k=1:200 set(t,'units','pixels'); set(t,'units','data'); end;
>> p = get(t,'position')


ans =
0.3399 0.2149 0 % but the text has not actually moved

>> set(t,'position',p) % the text still does not move!
>> set(t,'position',p + 1e-30) % the text moves a lot!


Pretty strange behavior. 1e-30 is about 27 orders of magnitude smaller than any distance your eye could possibly perceive, so it is surprising when the text would move a few inches when adding such a small number.

What appears to be happening is that (precisely) a one pixel error in both x and y is introduced every time you switch units. This was in Matlab 2009b under Win7, but I also tried it in a much older version (Matlab 6.1 from 13 years ago) under WinXP and it seemed to do the same crazy thing.

I was wondering if someone was willing to try this in a more recent version of Matlab to see if it has been fixed?

~Paul



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