1 %
2 % An example logo character. Building the PostScript program that prints
3 % your company logo is not addressed here; we assume you already have
4 % such a program, that it's relatively simple, and that it prints the
5 % logo by itself on a page. What you'll find here are instructions for
6 % converting that logo program into a character that can be accessed by
7 % troff and dpost.
8 %
9 % Building a new charlib character involves some PostScript programming.
10 % We've tried to isolate parameters that you'll need to change (Xoffset,
11 % Yoffset, and Scaling), but we can't guarantee things will work properly
12 % with every logo program. PostScript is a complex language and subtle
13 % interactions between your logo program and what we've done here can
14 % cause problems.
15 %
16 % Tuning the new character is an iterative process. You may want to adjust
17 % the size of the logo (via Scaling), it's position relative to adjacent
18 % characters and the baseline (Xoffset and Yoffset), and the distance troff
19 % moves after printing the character (width field in file ../S1). The steps
20 % to follow are:
21 %
22 %	1: Create a simple troff test file for the new character. Something
23 %	   like,
24 %
25 %		.sp 1i
26 %		.ps 10
27 %		size 10: \(LH
28 %		.sp 1i
29 %		.ps 18
30 %		size 18: \(LH
31 %		.sp 1i
32 %		.ps 36
33 %		size 36: \(LH
34 %		.sp 1i
35 %		.ps 10
36 %		four logo characters: \(LH\(LH\(LH\(LH
37 %
38 %	   is sufficient. The test file can go anywhere.
39 % 
40 %	2: Change into directory /usr/lib/font/devpost/charlib. All file
41 %	   pathnames will be relative to that directory.
42 %
43 %	3: Save a copy of the working LH logo file. Then replace LH with
44 %	   this file (i.e. LH.example). Changes described below should be
45 %	   be made in the new LH file (not in LH.example).
46 %
47 %	4: Your PostScript logo program will eventually replace whatever
48 %	   you find between the <<StartLogo>> and <<EndLogo>> comment lines
49 %	   in the PostScript build_LH procedure (below). What's there now
50 %	   prints an example logo that you can use until you understand the
51 %	   remaining steps.
52 %
53 %	5: Print your troff test file using (assuming your making changes
54 %	   in the devpost charlib directory),
55 %
56 %		troff -Tpost testfile | dpost | lp ...
57 %
58 %	6: Adjust the logo positioning by changing the numbers assigned to
59 %	   Xoffset and Yoffset (below). Both are in units of 72 per inch.
60 %	   Positive offsets should move the logo to the right and up the
61 %	   page.
62 %
63 %	7: Adjust the logo size by changing the the number assigned to
64 %	   Scaling. Unitsize also controls scaling, but there's no good
65 %	   reason to change both Scaling and Unitsize.
66 %
67 %	8: Control the horizontal distance troff moves after printing the
68 %	   new LH character by changing the width (i.e. the number in the
69 %	   second column) assigned to LH in file ../S1. Character width
70 %	   adjustments should probably wait until you're satisfied with
71 %	   the Scaling set in step 7.
72 %
73 %	9: Back to step 5 until your satisfied with the output.
74 %
75 % The remaining steps are suggested but not required:
76 %
77 %      10: Delete PostScript comments in your new LH charlib file - comments
78 %	   start with % and go to the end of the line.
79 %
80 %      11: Update the width field assigned to LH in file ../shell.lib. The
81 %	   new width should reflect what's currently in your S1 font file.
82 %
83 %      12: Make a similiar set of changes in /usr/lib/font/devLatin1/charlib.
84 %	   You can use the devpost version of LH to devLatin1/charlib/LH,
85 %	   but changes to files devLatin1/S1 and devLatin1/shell.lib must be
86 %	   entered by hand.
87 %
88 
89 /Logo_Dict 100 dict dup begin
90 	/Xoffset 0 def			% 72 dpi with positive to the right
91 	/Yoffset 0 def			% 72 dpi with positive up the page
92 	/Scaling 1.0 def		% adjust this number to change the size
93 	/Unitsize 36 def		% for point size scaling - leave it be
94 	/showpage {} def
95 end def
96 
97 /build_LH {				% don't bind this procedure
98 	Logo_Dict begin
99 		gsave
100 		/charwidth exch def
101 		currentpoint translate
102 		resolution 72 div dup scale
103 		Xoffset Yoffset translate
104 		Scaling Scaling scale
105 		ptsize Unitsize div dup scale
106 
107 		%% Replace everything between the <<StartLogo>> and <<EndLogo>>
108 		%% comment lines by the PostScript program that prints your
109 		%% logo.
110 
111 		%% <<StartLogo>>
112 			newpath
113 			.5 .5 scale
114 			0 0 moveto
115 			100 0 lineto
116 			100 100 lineto
117 			closepath
118 			.5 setgray
119 			fill
120 			0 setgray
121 			10 10 translate
122 			45 rotate
123 			0 5 moveto
124 			/Helvetica findfont 18 scalefont setfont
125 			(Example Logo) show
126 		%% <<EndLogo>>
127 
128 		grestore
129 	end
130 } def
131