[Libreoffice-bugs] [Bug 46595] Add choice for vertical align to optical center

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46595

--- Comment #2 from Juudaime at seznam.cz 2012-04-03 11:59:11 PDT ---
To cite properly:

"Optical Center is the spot that the eye sees when it first encounters a page.
The optical center is slightly above the mathematical center of the page. It
takes a compelling object indeed to pull the eyes away from it. The optical
center is the starting point."
<http://www2.selu.edu/Academics/Faculty/galkadi/233/DTPNOTES%20modified.htm>

Optical center is closely related to golden ratio and golden ratio is afaik
most used way to construct it. The difference between geometric and optical
center can be seen on this picture:
<http://www.pixy.cz/pixylophone/obrazky/zlatyrez3.gif> (optical center is
green)

There are also some slightly different ways to construct it:

Following picture shows one of them:
<http://antypa.cz/wp-content/uploads/2010/03/Picture-38.png>

One simplified method to find optical center is descibed at
<http://books.google.cz/books?id=r5arjo6JSgQC&pg=PA29&lpg=PA29&dq=optical+center+typography&source=bl&ots=XoQBBNOU3r&sig=rj4Rm18HZcpco3sbXk5SGIXcLT8&hl=cs&sa=X&ei=QUB7T-urBobLhAfl881p&redir_esc=y#v=onepage&q=optical%20center%20typography&f=false>

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