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diff --git a/share/doc/usd/22.trofftut/tt03 b/share/doc/usd/22.trofftut/tt03 new file mode 100644 index 0000000..7166f05 --- /dev/null +++ b/share/doc/usd/22.trofftut/tt03 @@ -0,0 +1,204 @@ +.\" This module is believed to contain source code proprietary to AT&T. +.\" Use and redistribution is subject to the Berkeley Software License +.\" Agreement and your Software Agreement with AT&T (Western Electric). +.\" +.\" @(#)tt03 8.1 (Berkeley) 6/8/93 +.\" +.\" $FreeBSD$ +.NH +Fonts and Special Characters +.PP +.UL troff +and the typesetter allow four different fonts at any one time. +Normally three fonts (Times roman, italic and bold) and one collection of special characters +are permanently +mounted. +.P1 2 +.ft R +abcdefghijklmnopqrstuvwxyz 0123456789 +ABCDEFGHIJKLMNOPQRSTUVWXYZ +.ft I +abcdefghijklmnopqrstuvwxyz 0123456789 +ABCDEFGHIJKLMNOPQRSTUVWXYZ +.ft B +abcdefghijklmnopqrstuvwxyz 0123456789 +ABCDEFGHIJKLMNOPQRSTUVWXYZ +.ft R +.P2 +The +greek, mathematical symbols and miscellany +of the special font are +listed in Appendix A. +.PP +.UL troff +prints in roman unless told otherwise. +To switch into bold, use +the +.BD .ft +command +.P1 +^ft B +.P2 +and for italics, +.P1 +^ft I +.P2 +To return to roman, use +.BD .ft\ R ; +to return to the previous font, +whatever it was, +use either +.BD .ft\ P +or just +.BD .ft . +The `underline' command +.P1 +^ul +.P2 +causes the next input line to print in italics. +.BD .ul +can be followed by a count to +indicate that more than one line is to be italicized. +.PP +Fonts can also be changed within a line or word +with the in-line command +.BD \ef : +.P1 +\fBbold\fIface\fR text +.P2 +is produced by +.P1 +\efBbold\efIface\efR text +.P2 +If you want to do this so the previous font, whatever it was, +is left undisturbed, insert extra +.BD \efP +commands, like this: +.P1 +\efBbold\efP\efIface\efP\efR text\efP +.P2 +Because only the immediately previous font is remembered, +you have to restore the previous font after each change +or you can lose it. +The same is true of +.BD .ps +and +.BD .vs +when used without an argument. +.PP +There are other fonts available besides the standard set, +although you can still use only four at any given time. +The command +.BD .fp +tells +.UL troff +what fonts are physically mounted on the typesetter: +.P1 +^fp 3 H +.P2 +says that the Helvetica font is mounted on position 3. +(The complete list of font sizes and styles depends on +your typesetter or laser printer.) +Appropriate +.BD .fp +commands should appear at the beginning of your document +if you do not use the standard fonts. +.PP +It is possible to make a document relatively independent +of the actual fonts used to print it +by using font numbers instead of names; +for example, +.BD \ef3 +and +.BD .ft\ 3 +mean `whatever font is mounted at position 3', +and thus work for any setting. +Normal settings are roman font on 1, italic on 2, +bold on 3, +and special on 4. +.PP +There is also a way to get `synthetic' bold fonts +by overstriking letters with a slight offset. +Look at the +.BD .bd +command in [1]. +.WS +.PP +Special characters have four-character names beginning with +.BD \e( , +and they may be inserted anywhere. +For example, +.P1 +\(14 + \(12 = \(34 +.P2 +is produced by +.P1 +\e(14 + \e(12 = \e(34 +.P2 +In particular, +greek letters are all of the form +.BD \e(*\- , +where +.BD \- +is an upper or lower case roman letter +reminiscent of the greek. +Thus +to get +.P1 +\(*S(\(*a\(mu\(*b) \(-> \(if +.P2 +in bare +.UL troff +we have to type +.P1 +\e(*S(\e(*a\e(mu\e(*b) \e(\(mi> \e(if +.P2 +That line is unscrambled as follows: +.P1 +.ta 1i 2i 3i +\e(*S \(*S +( ( +\e(*a \(*a +\e(mu \(mu +\e(*b \(*b +) ) +\e(\(mi> \(-> +\e(if \(if +.P2 +A complete list of these special names occurs in Appendix A. +.PP +In +.UL eqn +[2] +the same effect can be achieved with the input +.P1 +SIGMA ( alpha times beta ) \-> inf +.P2 +which is less concise, but clearer to the uninitiated. +.PP +Notice that +each +four-character name is a single character +as far as +.UL troff +is concerned _ +the +`translate' command +.P1 +^tr \e(mi\e(em +.P2 +is perfectly clear, meaning +.P1 +^tr \(mi\(em +.P2 +that is, to translate \(mi into \(em. +.PP +Some characters are automatically translated into others: +grave \(ga and acute \(aa accents (apostrophes) become open and close single quotes +`\|'\|; +the combination of ``...'' is generally preferable to the double quotes "...". +Similarly a typed minus sign becomes a hyphen -. +To print an explicit \- sign, use +.BD \e\|- . +To get a backslash printed, use +.BD \ee . |
