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From: Kenichi Handa <handa@gnu.org>
To: emacs-devel@gnu.org
Subject: Re: compose-region docstring update (was: using glyphs by default in perl-mode)
Date: Sun, 09 Jun 2013 08:45:48 -0400	[thread overview]
Message-ID: <yw7hah7311f.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <877gi6qa57.fsf_-_@lifelogs.com> (message from Ted Zlatanov on Fri, 07 Jun 2013 10:16:04 -0400)

In article <877gi6qa57.fsf_-_@lifelogs.com>, Ted Zlatanov <tzz@lifelogs.com> writes:

KH> Yes.  And, here are simple examples:

KH> (insert (compose-string "." 0 1 '(?+ (tc . bc) ?o)))
KH> (insert (compose-string "." 0 1 '(?+ (cc . cc) ?o)))

> Thanks for the examples.  Can you explain them (I think I do, but your
> words would be welcome help)?  I will update the docstring once I
> understand this well enough.

I'll try to explain the first example.  In it,
compose-string has the optional 4th argument COMPONENTS.
The explanation of COMPONENTS (of type "list") is explained in
compose-region as below:

If it is a vector or list, it is a sequence of alternate characters and
composition rules, where (2N)th elements are characters and (2N+1)th
elements are composition rules to specify how to compose (2N+2)th
elements with previously composed N glyphs.

So, as for (?+ (tc . bc) ?o), ?+ is the first alternate
character, (tc . bc) is the first composition rule, ?o is
the second alternate character.  This means ?o is composed
with ?+ by the rule (tc . bc).

And the docstring of reference-point-alist explains the meaing of (tc
. bc).  According to the docstring, it means that ?o is compose with ?+
by aligning the top-center point of the glyphs of ?+ and the
bottom-center point of the glyph of ?o.  That yeilds a glyph whose
lower part is ?+ and upper part is ?o.

---
Kenichi Handa
handa@gnu.org



  reply	other threads:[~2013-06-09 12:45 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-30  0:50 using glyphs by default in perl-mode Dan Nicolaescu
2013-05-05  4:37 ` Stefan Monnier
2013-05-05  7:34   ` James Cloos
2013-05-06  1:09     ` Stefan Monnier
2013-05-06  4:26       ` Dan Nicolaescu
2013-05-06 15:09         ` Stefan Monnier
2013-05-07 16:32           ` Dan Nicolaescu
2013-05-07 21:20             ` Stefan Monnier
2013-05-08  3:22               ` Dan Nicolaescu
2013-05-08  4:02                 ` Stefan Monnier
2013-05-09 16:31                   ` Dan Nicolaescu
2013-05-09 16:39                     ` Eli Zaretskii
2013-05-09 17:22                       ` Stefan Monnier
2013-05-09 18:39                         ` Dan Nicolaescu
2013-05-09 18:58                         ` Andreas Röhler
2013-05-09 19:31                         ` James Cloos
2013-05-17 13:01                         ` Ted Zlatanov
2013-05-17 15:48                           ` Stefan Monnier
2013-05-19  2:50                             ` Ted Zlatanov
2013-05-30  0:01                               ` Dan Nicolaescu
2013-05-30 14:47                                 ` Ted Zlatanov
2013-05-30 17:18                                   ` Stefan Monnier
2013-05-30 20:32                                     ` Ted Zlatanov
2013-06-01  6:29                                     ` Dan Nicolaescu
2013-06-01 13:46                                       ` Ted Zlatanov
2013-06-01 14:47                                         ` Stefan Monnier
2013-06-02 12:35                                           ` Ted Zlatanov
2013-06-02 15:52                                             ` Stefan Monnier
2013-06-03  2:02                                               ` Ted Zlatanov
2013-06-03  2:04                                                 ` Ted Zlatanov
2013-06-03  7:04                                                   ` Stefan Monnier
2013-06-04  1:52                                                     ` Ted Zlatanov
2013-06-04 14:28                                                       ` Davis Herring
2013-06-04 17:20                                                       ` Stefan Monnier
2013-06-04 20:06                                                         ` Ted Zlatanov
2013-06-05  1:27                                                           ` Stefan Monnier
2013-06-05 14:45                                                             ` Ted Zlatanov
2013-06-05 16:13                                                               ` Stefan Monnier
2013-06-05 17:28                                                                 ` Ted Zlatanov
2013-06-05 17:42                                                                   ` joakim
2013-06-05 17:58                                                                     ` Ted Zlatanov
2013-06-05 17:50                                                                   ` Ted Zlatanov
2013-06-05 18:52                                                                   ` Stefan Monnier
2013-06-05 19:36                                                                     ` Ted Zlatanov
2013-06-05 20:13                                                                       ` joakim
2013-06-05 16:43                                                               ` Glenn Morris
2013-06-05 17:52                                                                 ` Ted Zlatanov
2013-06-05 18:07                                                                   ` Glenn Morris
2013-06-05 18:33                                                                     ` Ted Zlatanov
2013-06-05 18:55                                                                   ` Stefan Monnier
2013-06-05 19:34                                                                     ` Ted Zlatanov
2013-06-05 20:19                                                                       ` Stefan Monnier
2013-06-07  7:36                                                               ` Eli Zaretskii
2013-06-07  7:45                                                                 ` bug#13189: " Jambunathan K
2013-06-07 13:05                                                                   ` Ted Zlatanov
2013-06-07 16:07                                                                     ` Stefan Monnier
2013-06-07 16:07                                                                     ` Stefan Monnier
2013-06-07 16:44                                                                       ` Glenn Morris
2013-06-07 18:03                                                                         ` Ted Zlatanov
2013-06-07 19:14                                                                         ` Jambunathan K
2013-06-07 20:04                                                                           ` Glenn Morris
2013-06-07 19:15                                                                         ` Stefan Monnier
2013-06-07  7:45                                                                 ` Jambunathan K
2013-06-07 12:48                                                                 ` Ted Zlatanov
2013-06-07 14:52                                                                   ` Eli Zaretskii
2013-06-07 15:39                                                                     ` Ted Zlatanov
2013-06-07 12:53                                                                 ` Kenichi Handa
2013-06-07 14:16                                                                   ` compose-region docstring update (was: using glyphs by default in perl-mode) Ted Zlatanov
2013-06-09 12:45                                                                     ` Kenichi Handa [this message]
2013-05-09 18:30                       ` using glyphs by default in perl-mode Dan Nicolaescu
2013-05-10  0:23                     ` Richard Stallman

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