[Xy-pic] Arrow with filled head
Thu, 19 Sep 2002 21:44:20 +1000 (EST)
> Thanks for your comprehensive answer.
> Let me add the following. In my (very) humble opinion, filled arrow heads
> would be a nice addition not because of elegance but because sometimes they
> are the required notation. In my case it was to draw UML activity diagrams.
> UML class diagrams are another case. In this last case, filled arrows even
> have a different associated semantics than empty triangle heads (which are
> also used) or simple arrows (also used).
OK; in that case, it sounds like it would be nice to have 2 new fonts
for Xy-pic; one of one triangular aeeow-heads, and another of filled
These fonts would need to be constructed along similar to XYATIP10, etc.
(preferably as Type 1) so that they could be used with any Xy-pic driver
When Kris and I were writing Xy-pic (many years ago) we disussed the
possibility of extra fonts of rotated characters; e.g. zig-zags, coils, etc.
It was never followed-up as neither of us had a pressing need for these.
Perhaps there is someone on the Xy-pic list who would like to take
up the challenge.
Designing with Metafont, and/or MetaPost would be a good way to start
on such a project. Adding hinting to the Type 1 fonts is the hardest aspect.
> Best regards
> Joao Paulo Barros
> ----- Original Message -----
> From: "Ross Moore" <email@example.com>
> To: "Joao Paulo Barros" <firstname.lastname@example.org>
> Sent: Thursday, September 19, 2002 11:31 AM
> Subject: Re: [Xy-pic] Arrow with filled head
> Hello Joao,
> > I am just starting to use xy-pic and would like to know how to draw an
> > with a filled triangle as head.
> You cannot do this easily, unless you define PostScript code for the
> or pick some character from a font to use, and rotate it appropriately.
> Xy-pic provides its own arrowheads which (the authors believe) are far more
> elegant than using filled triangles.
> There are 2 varieties: the standard Xy-pic sharp arrows-heads,
> and the CM wide tipped arrows-heads, which are similar in design
> to other arrow-heads in TeX fonts;
> e.g. as given by \to , \rightarrow, \downarrow, etc.
> You can make the arrow-heads to be "fatter", but still rounded,
> using a PostScript back-end, and the [thicker] modifier;
> see the Xy-pic reference manual for an example of this.
> Indeed, you should consult the section in this manual devoted to use of
> alternate arrow-tips.
> There is also an example of rotating font-characters to use as tips,
> in the section about rotations (implemented in PostScript).
> > Thanks a lot in advance
> Hope this helps,
> Ross Moore
> > Joao Paulo Barros
> > email@example.com
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