[Xy-pic] Thicker arrows

[Henning Makholm]

Scripsit "Vadim Yu. Radionov" <vadim at mccme.ru>
> On Tue, 8 Jul 2003, Christian Stork wrote:

> > How can I increase the thickness of arrows?

> I believe you cannot (unless you want to imitate it with a kind of
> poor-man's-bold trick).  Xypic uses certain fonts for arrow heads

It ought to be possible to preload the fonts at a larger size (which
will affects all lines drawn by Xy-pic), as described in section 1.3
of the reference manual.

However, the code that implements this seems to be broken in 3.7:

| \message{fonts;}
| \xydef@\xyfont@#1{\ifx#1\undefined \DN@{\global\font#1}\expandafter\next@
|  \else \xywarning@{Using previously loaded \string#1\space font}\fi}
| \xyfont@\xydashfont=xydash10

etc... so if, say, \xydashfont is already loaded,
"\xyfont@\xydashfont" will expand to commands that emit a warning,
after which TeX will attempt to *typeset* the text "=xydash10", with
probably undesirable effects.

-- 
Henning Makholm                    "*Her* sidder jaj & har *ild* bå cigarren
                            *imens* Pelle Jönsson i Nordnorge har mavepine."