[Koha-bugs] [Bug 2499] Improvement on text wrapping algorithm needed

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=2499

--- Comment #5 from wajasu <matted-34813 at mypacks.net> ---
Created attachment 15898
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http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=15898&action=edit
0001-Bug-2499 add support for text wrapping using proportional font metrics

Currently when labels are printed and the text would render past the
bounding label definition, the number of chars that can be written per
row is based off of a fixed size for a character in that font.

This change performs text wrapping based on each character's character
width metric contained in the specified font.  Once truncation is
detected, it scans back and breaks on a space, and continues with the
next words on subsequent lines.  It will allow more characters or
words from a 'title' to be written per line when possible.

0001-Bug-2499-add-support-for-text-wrapping-using-proportional font metrics
is an improvement, and deals with horizontal aspects, cramming more characters
per line when wrapping.

The original bug comment wants us to calculate the number of lines one can
write vertically so we dont arbitrarily cut off after 2, but use what we can
without overlaying a barcode or such.

To test this patch:
-With a working BIBBAR based label, use  itemcallnumber,author,title as well.
-With a test biblio, create a batch, and export it as a PDF.
-Edit that biblio, and make the title longer (add 4 3 letter words) so that it
would wrap to another line, but seems to have space to fit the words it
wrapped.
-APPLY PATCH
-Export batch as a PDF.
-Confirm that more words fit per line. 


To fulfill the original bug description:
- perform calculations to determin the number of lines we can write without
overlaying the barcode or running past the bottom of the label.
- maintain this rows_to_write counter and stop writing lines accordingly,

I got this patch in because it should not break anyones existing labels.

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