132 lines
4.3 KiB
Text
132 lines
4.3 KiB
Text
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% An example logo character. Building the PostScript program that prints
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% your company logo is not addressed here; we assume you already have
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% such a program, that it's relatively simple, and that it prints the
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% logo by itself on a page. What you'll find here are instructions for
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% converting that logo program into a character that can be accessed by
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% troff and dpost.
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%
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% Building a new charlib character involves some PostScript programming.
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% We've tried to isolate parameters that you'll need to change (Xoffset,
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% Yoffset, and Scaling), but we can't guarantee things will work properly
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% with every logo program. PostScript is a complex language and subtle
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% interactions between your logo program and what we've done here can
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% cause problems.
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%
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% Tuning the new character is an iterative process. You may want to adjust
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% the size of the logo (via Scaling), it's position relative to adjacent
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% characters and the baseline (Xoffset and Yoffset), and the distance troff
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% moves after printing the character (width field in file ../S1). The steps
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% to follow are:
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%
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% 1: Create a simple troff test file for the new character. Something
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% like,
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%
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% .sp 1i
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% .ps 10
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% size 10: \(LH
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% .sp 1i
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% .ps 18
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% size 18: \(LH
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% .sp 1i
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% .ps 36
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% size 36: \(LH
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% .sp 1i
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% .ps 10
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% four logo characters: \(LH\(LH\(LH\(LH
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%
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% is sufficient. The test file can go anywhere.
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%
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% 2: Change into directory /usr/lib/font/devpost/charlib. All file
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% pathnames will be relative to that directory.
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%
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% 3: Save a copy of the working LH logo file. Then replace LH with
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% this file (i.e. LH.example). Changes described below should be
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% be made in the new LH file (not in LH.example).
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%
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% 4: Your PostScript logo program will eventually replace whatever
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% you find between the <<StartLogo>> and <<EndLogo>> comment lines
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% in the PostScript build_LH procedure (below). What's there now
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% prints an example logo that you can use until you understand the
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% remaining steps.
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%
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% 5: Print your troff test file using (assuming your making changes
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% in the devpost charlib directory),
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%
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% troff -Tpost testfile | dpost | lp ...
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%
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% 6: Adjust the logo positioning by changing the numbers assigned to
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% Xoffset and Yoffset (below). Both are in units of 72 per inch.
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% Positive offsets should move the logo to the right and up the
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% page.
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%
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% 7: Adjust the logo size by changing the the number assigned to
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% Scaling. Unitsize also controls scaling, but there's no good
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% reason to change both Scaling and Unitsize.
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%
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% 8: Control the horizontal distance troff moves after printing the
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% new LH character by changing the width (i.e. the number in the
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% second column) assigned to LH in file ../S1. Character width
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% adjustments should probably wait until you're satisfied with
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% the Scaling set in step 7.
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%
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% 9: Back to step 5 until your satisfied with the output.
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%
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% The remaining steps are suggested but not required:
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%
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% 10: Delete PostScript comments in your new LH charlib file - comments
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% start with % and go to the end of the line.
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%
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% 11: Update the width field assigned to LH in file ../shell.lib. The
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% new width should reflect what's currently in your S1 font file.
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%
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% 12: Make a similiar set of changes in /usr/lib/font/devLatin1/charlib.
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% You can use the devpost version of LH to devLatin1/charlib/LH,
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% but changes to files devLatin1/S1 and devLatin1/shell.lib must be
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% entered by hand.
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%
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/Logo_Dict 100 dict dup begin
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/Xoffset 0 def % 72 dpi with positive to the right
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/Yoffset 0 def % 72 dpi with positive up the page
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/Scaling 1.0 def % adjust this number to change the size
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/Unitsize 36 def % for point size scaling - leave it be
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/showpage {} def
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end def
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/build_LH { % don't bind this procedure
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Logo_Dict begin
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gsave
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/charwidth exch def
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currentpoint translate
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resolution 72 div dup scale
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Xoffset Yoffset translate
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Scaling Scaling scale
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ptsize Unitsize div dup scale
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%% Replace everything between the <<StartLogo>> and <<EndLogo>>
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%% comment lines by the PostScript program that prints your
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%% logo.
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%% <<StartLogo>>
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newpath
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.5 .5 scale
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0 0 moveto
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100 0 lineto
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100 100 lineto
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closepath
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.5 setgray
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fill
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0 setgray
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10 10 translate
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45 rotate
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0 5 moveto
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/Helvetica findfont 18 scalefont setfont
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(Example Logo) show
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%% <<EndLogo>>
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grestore
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end
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} def
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