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diff --git a/Master/texmf-dist/doc/latex/cjk/doc/vertical.txt b/Master/texmf-dist/doc/latex/cjk/doc/vertical.txt new file mode 100644 index 00000000000..1766d3c29ba --- /dev/null +++ b/Master/texmf-dist/doc/latex/cjk/doc/vertical.txt @@ -0,0 +1,120 @@ +This is the file vertical.txt of the CJK macro package ver. 4.8.0 +(22-May-2008). + + +Vertical typesetting +==================== + +TeX itself can't support vertical typesetting. Nevertheless, it is possible +to emulate it by rotating glyphs by 90 degrees. + +The CJK package supports two different approaches: + +o Provide fonts which already contain rotated glyphs. In this case, the + only difference to normal typesetting is the emulation of bold + characters by printing a character three times with slight vertical + offsets instead of horizontal ones. Both hbf2gf and ttf2pk can produce + rotated bitmap fonts. The major disadvantage is that it doesn't work + well for outline fonts since there is no portable way to implement + rotation on the font level which works for both PostScript and PDF + output. + + You need a `.fdx' file for this option which at least contains + `\CJKvdef{norotate}{}'. + +o Use the graphicx package to rotate glyphs. A disadvantage is that + processing of a document is much slower and that documents tend to be + much larger in size. On the other hand, PDF and PostScript output can be + produced from identical sources since graphicx hides the implementation + differences. + + This works even without a `.fdx' file in case CJK's default rotation + parameters are fine. + + +CJKvert.sty +----------- + +Loading CJKvert.sty activates vertical support. The two commands to be used +in documents are \CJKvert and \CJKhorz which do the obvious. \CJKvert is +the default. The two commands act locally, not globally. + +Use macro \CJKbaselinestretch to adjust the baseline stretch during vertical +typesetting. The default value is `1.3'. + +Package option `usebaselinestretch' saves the \baselinestretch value set +before loading CJKvert.sty. If this option is active, then + + new \baselinestretch = \CJKbaselinestretch * \baselinestretch + +after issuing \CJKvert. Otherwise, it is simply + + new \baselinestretch = \CJKbaselinestretch + +Similarly, \CJKhorz restores the old \baselinestretch value if +`usebaselinestretch' is active; without the option, \baselinestretch is set +to `1'. + + +Problems with vertical typesetting +---------------------------------- + +Some glyphs can't be used directly for vertical typesetting; a simple +rotation by 90 degrees would produce ugly results for various reasons: + +o Many punctuation characters have special vertical representation forms. + Some fonts contain proper vertical glyphs, but many don't. In the latter + case it is necessary to provide alternative methods to improve the + optical appearance. + +o Non-rotated (latin) text within rotated (CJK) text is aligned + differently as if text is written horizontally. Rotated glyphs thus must + be slightly shifted. + +o Some fonts contain CJK glyphs without quadratic bounding boxes but only + monospaced advance widths. It is then necessary to provide glyph + dimensions to assure monospaced advance heights after rotation. + +See the documentation file `fdxfiles.txt' for details on setting up +extended font definition files which can handle those items. + + +Fonts with vertical representation forms +---------------------------------------- + +OpenType fonts intended for vertical typesetting normally contain a GSUB +feature called `vert' which provides a mapping to vertical instead of +horizontal representation forms. ttf2tfm automatically takes care of it (see +below), but if such fonts have been converted to sets of Type 1 subfonts +this feature is lost. + +A solution to this problem is to collect all vertical representation glyphs +in a special Type 1 subfont. See the scripts vertical.pe, vertref.pe (for +FontForge), and makefdx.pl (for Perl) in the directory utils/subfonts which +do that. + +At the moment of this writing, only the fonts bsmi00lp.ttf and bkai00mp.ttf +for traditional Chinese have been transformed to Type 1 subfonts together +with a font with vertical representation glyphs (bsmilpv.pfb and +bkaimpv.pfb). They are part of the corresponding CJK font bundles found on +CTAN. See the file INSTALL for more information. + + +Rotated fonts +------------- + +o To install a rotated font to be handled by hbf2gf, simply proceed as + usual, with one difference: You have to add a line + + rotation yes + + to the hbf2gf configuration file of this font. x_offset and y_offset + values must be adjusted too. Look at the example configuration file + b5kr12.cfg for details---as you can see, the name of the non-rotated + font (b5ka12) has been changed to `b5kr12'. + +o With ttf2tfm, use the `-x' switch to activate rotation. For details + please refer to the man pages of ttf2tfm and ttf2pk. + + +---End of vertical.txt--- |