Re: Diagrams: spurious spacing

[Valeriy E. Ushakov]

On Mon, Dec 04, 2000 at 20:46:05 -0300, Marcelo Huerta wrote:

> Finally, some charitable soul could explain for me the difference
> between / and // (and also | and ||)? Yes, I've RTFM, but sadly I
> haven't understood the explanation :-(

Lout operates on rectangular objects.  Each object has one or more
horizontal (row) and vertical (column) mark(s).  When / or |
concatenation is applied to two objects Lout aligns their marks
(column marks for / and row marks for | operator), e.g. A / B might
look like this (with common column mark protruding through the
result of concatenation)

                |
        +-------|----------------------+
        |A      |                      |
        |       |                      |
        +-------|----------------------+
                |
             +--|---+
             |B |   |
             |  |   |
             +--|---+

If objects have several marks Lout will align all marks (adjusting
gaps between marks as necessary).


OTOH, // and || ignore marks altogether and align left or top edges of
concatenated objects, e.g A // B will look like this (with ignored
marks of A and B drawn inside objects just to show they are there but
are ignored):

        +------------------------------+
        |A      |                      |
        |       |                      |
        +------------------------------+
                
        +------+
        |B |   |
        |  |   |
        +------+


You can select which mark of the concatenation will be the principal
mark by using ^ variants of concatenation operators.

You can "glue" concatenation objects for good by dropping all but the
principal mark with @OneRow and @OneCol.

You can move the principal mark with @VShift and @HShift (hint: use
'w' unit).  The names are somewhat unintuitive, the mnemonic is that
@HShift moves (vertical) column mark _H_orizontally (and v/v for @VSHift).


SY, Uwe
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