[Tcl-bugs] [ tktoolkit-Bugs-1535865 ] Different font sizes reported

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Bugs item #1535865, was opened at 2006-08-07 03:32
Message generated for change (Comment added) made by hobbs
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Category: 05. Canvas Items
Group: current: 8.5a4
>Status: Pending
>Resolution: Invalid
Priority: 5
Submitted By: Carlos Tasada (ctasada)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: Different font sizes reported

Initial Comment:
Hi guys,

Playing with the fonts I've seen an small difference in
the font sizes when I test it in different ways.

(Bin) 21 % .c create text 100 50 -text "Test String"
-font "arial 8"
8
(Bin) 22 % font measure "arial 8" "Test String"
52
(Bin) 23 % .c bbox 8
73 43 127 57
(Bin) 24 % 

As you can see, the "font measure" sais it's 52, but
the bbox sais it's 54. Looking in the bbox
documentation I see it sais it returns an "approximate
bounding box" and that "may overestimate", but it
always returns the same difference. But then I do an
screenshot, and when I measure the width I get 51.

I known is a small difference, but working with a lot
of texts in the screen and trying to make them fit
together, the code becomes a bit messy :(

Thanks again.

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>Comment By: Jeffrey Hobbs (hobbs)
Date: 2006-08-07 10:17

Message:
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I have found the bbox to always overestimate by 1px around,
so that is as expected.  This is actually useful behavior
(and perhaps originally intended?) when you want to place a
rect around a text.  As to the specific width, I'm not sure
that being off by 1px is "out of whack", as that number is
returned by native APIs.

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