Re: [NTG-context] Centering a figure vertically on a page

On Tue, Jul 3, 2012 at 6:08 PM, Wolfgang Schuster < schuster.wolfgang@gmail.com> wrote:

Am 03.07.2012 um 18:04 schrieb luigi scarso:

On Tue, Jul 3, 2012 at 5:27 PM, Alan BRASLAU wrote:

...

On Tue, 3 Jul 2012 15:48:43 +0200 Hans Hagen wrote:

...

It's a rather (old) low level boxing macro ...

\start \showboxes \centerbox width 10cm height 3cm {Alan is surprised} \stop

My TeX culture remains, alas, always limited (even if I have the TeXbook on my office bookshelf, indeed \centerbox does not appear in plain TeX). Nothing in the ConTeXt manual, either. Of course, a leisurely browsing of the source code would reveal many such treasures! There is also \vcenter

\starttext xxxxxxxxxxg\ruledvbox{\hsize=5cm\vcenter to 3cm{Alan is surprised}}gxxxxxxxxx \type{\vcenter}\par xxxxxxxxxxg\ruledvbox{\centerbox width5cm height3cm{Alan is surprised}}gxxxxxxxxx \type{\centerbox}\par xxxxxxxxxxg\ruledvbox{\vcenter{\centerbox width5cm height3cm{Alan is surprised}}}gxxxxxxxxx\type{\centerbox+\vcenter}\par \stoptext

(\vcenter is a TeX primitive)

ConTeXt redefines \vcenter because the primitive can only be used in math mode.

yes I know ... and original TeX primitive is still available as \normalvcenter (kind of easter egg for Alan..) -- luigi