285 lines
9.3 KiB
PostScript
285 lines
9.3 KiB
PostScript
%%BeginProlog
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50 dict begin
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% This is a standard prolog for Postscript generated by Tk's canvas
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% widget.
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% SCCS: @(#) prolog.ps 1.5 96/02/17 17:45:11
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% The definitions below just define all of the variables used in
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% any of the procedures here. This is needed for obscure reasons
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% explained on p. 716 of the Postscript manual (Section H.2.7,
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% "Initializing Variables," in the section on Encapsulated Postscript).
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/baseline 0 def
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/stipimage 0 def
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/height 0 def
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/justify 0 def
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/lineLength 0 def
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/spacing 0 def
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/stipple 0 def
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/strings 0 def
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/xoffset 0 def
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/yoffset 0 def
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/tmpstip null def
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% Define the array ISOLatin1Encoding (which specifies how characters are
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% encoded for ISO-8859-1 fonts), if it isn't already present (Postscript
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% level 2 is supposed to define it, but level 1 doesn't).
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systemdict /ISOLatin1Encoding known not {
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/ISOLatin1Encoding [
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/space /space /space /space /space /space /space /space
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/space /space /space /space /space /space /space /space
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/space /space /space /space /space /space /space /space
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/space /space /space /space /space /space /space /space
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/space /exclam /quotedbl /numbersign /dollar /percent /ampersand
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/quoteright
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/parenleft /parenright /asterisk /plus /comma /minus /period /slash
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/zero /one /two /three /four /five /six /seven
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/eight /nine /colon /semicolon /less /equal /greater /question
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/at /A /B /C /D /E /F /G
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/H /I /J /K /L /M /N /O
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/P /Q /R /S /T /U /V /W
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/X /Y /Z /bracketleft /backslash /bracketright /asciicircum /underscore
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/quoteleft /a /b /c /d /e /f /g
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/h /i /j /k /l /m /n /o
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/p /q /r /s /t /u /v /w
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/x /y /z /braceleft /bar /braceright /asciitilde /space
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/space /space /space /space /space /space /space /space
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/space /space /space /space /space /space /space /space
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/dotlessi /grave /acute /circumflex /tilde /macron /breve /dotaccent
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/dieresis /space /ring /cedilla /space /hungarumlaut /ogonek /caron
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/space /exclamdown /cent /sterling /currency /yen /brokenbar /section
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/dieresis /copyright /ordfeminine /guillemotleft /logicalnot /hyphen
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/registered /macron
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/degree /plusminus /twosuperior /threesuperior /acute /mu /paragraph
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/periodcentered
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/cedillar /onesuperior /ordmasculine /guillemotright /onequarter
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/onehalf /threequarters /questiondown
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/Agrave /Aacute /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla
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/Egrave /Eacute /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex
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/Idieresis
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/Eth /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply
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/Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute /Thorn
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/germandbls
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/agrave /aacute /acircumflex /atilde /adieresis /aring /ae /ccedilla
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/egrave /eacute /ecircumflex /edieresis /igrave /iacute /icircumflex
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/idieresis
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/eth /ntilde /ograve /oacute /ocircumflex /otilde /odieresis /divide
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/oslash /ugrave /uacute /ucircumflex /udieresis /yacute /thorn
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/ydieresis
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] def
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} if
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% font ISOEncode font
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% This procedure changes the encoding of a font from the default
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% Postscript encoding to ISOLatin1. It's typically invoked just
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% before invoking "setfont". The body of this procedure comes from
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% Section 5.6.1 of the Postscript book.
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/ISOEncode {
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dup length dict begin
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{1 index /FID ne {def} {pop pop} ifelse} forall
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/Encoding ISOLatin1Encoding def
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currentdict
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end
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% I'm not sure why it's necessary to use "definefont" on this new
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% font, but it seems to be important; just use the name "Temporary"
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% for the font.
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/Temporary exch definefont
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} bind def
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% StrokeClip
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%
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% This procedure converts the current path into a clip area under
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% the assumption of stroking. It's a bit tricky because some Postscript
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% interpreters get errors during strokepath for dashed lines. If
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% this happens then turn off dashes and try again.
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/StrokeClip {
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{strokepath} stopped {
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(This Postscript printer gets limitcheck overflows when) =
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(stippling dashed lines; lines will be printed solid instead.) =
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[] 0 setdash strokepath} if
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clip
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} bind def
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% desiredSize EvenPixels closestSize
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%
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% The procedure below is used for stippling. Given the optimal size
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% of a dot in a stipple pattern in the current user coordinate system,
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% compute the closest size that is an exact multiple of the device's
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% pixel size. This allows stipple patterns to be displayed without
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% aliasing effects.
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/EvenPixels {
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% Compute exact number of device pixels per stipple dot.
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dup 0 matrix currentmatrix dtransform
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dup mul exch dup mul add sqrt
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% Round to an integer, make sure the number is at least 1, and compute
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% user coord distance corresponding to this.
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dup round dup 1 lt {pop 1} if
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exch div mul
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} bind def
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% width height string StippleFill --
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%
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% Given a path already set up and a clipping region generated from
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% it, this procedure will fill the clipping region with a stipple
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% pattern. "String" contains a proper image description of the
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% stipple pattern and "width" and "height" give its dimensions. Each
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% stipple dot is assumed to be about one unit across in the current
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% user coordinate system. This procedure trashes the graphics state.
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/StippleFill {
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% The following code is needed to work around a NeWSprint bug.
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/tmpstip 1 index def
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% Change the scaling so that one user unit in user coordinates
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% corresponds to the size of one stipple dot.
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1 EvenPixels dup scale
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% Compute the bounding box occupied by the path (which is now
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% the clipping region), and round the lower coordinates down
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% to the nearest starting point for the stipple pattern. Be
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% careful about negative numbers, since the rounding works
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% differently on them.
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pathbbox
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4 2 roll
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5 index div dup 0 lt {1 sub} if cvi 5 index mul 4 1 roll
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6 index div dup 0 lt {1 sub} if cvi 6 index mul 3 2 roll
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% Stack now: width height string y1 y2 x1 x2
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% Below is a doubly-nested for loop to iterate across this area
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% in units of the stipple pattern size, going up columns then
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% across rows, blasting out a stipple-pattern-sized rectangle at
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% each position
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6 index exch {
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2 index 5 index 3 index {
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% Stack now: width height string y1 y2 x y
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gsave
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1 index exch translate
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5 index 5 index true matrix tmpstip imagemask
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grestore
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} for
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pop
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} for
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pop pop pop pop pop
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} bind def
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% -- AdjustColor --
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% Given a color value already set for output by the caller, adjusts
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% that value to a grayscale or mono value if requested by the CL
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% variable.
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/AdjustColor {
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CL 2 lt {
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currentgray
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CL 0 eq {
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.5 lt {0} {1} ifelse
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} if
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setgray
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} if
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} bind def
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% x y strings spacing xoffset yoffset justify stipple DrawText --
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% This procedure does all of the real work of drawing text. The
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% color and font must already have been set by the caller, and the
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% following arguments must be on the stack:
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%
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% x, y - Coordinates at which to draw text.
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% strings - An array of strings, one for each line of the text item,
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% in order from top to bottom.
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% spacing - Spacing between lines.
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% xoffset - Horizontal offset for text bbox relative to x and y: 0 for
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% nw/w/sw anchor, -0.5 for n/center/s, and -1.0 for ne/e/se.
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% yoffset - Vertical offset for text bbox relative to x and y: 0 for
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% nw/n/ne anchor, +0.5 for w/center/e, and +1.0 for sw/s/se.
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% justify - 0 for left justification, 0.5 for center, 1 for right justify.
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% stipple - Boolean value indicating whether or not text is to be
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% drawn in stippled fashion. If text is stippled,
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% procedure StippleText must have been defined to call
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% StippleFill in the right way.
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%
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% Also, when this procedure is invoked, the color and font must already
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% have been set for the text.
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/DrawText {
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/stipple exch def
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/justify exch def
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/yoffset exch def
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/xoffset exch def
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/spacing exch def
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/strings exch def
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% First scan through all of the text to find the widest line.
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/lineLength 0 def
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strings {
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stringwidth pop
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dup lineLength gt {/lineLength exch def} {pop} ifelse
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newpath
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} forall
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% Compute the baseline offset and the actual font height.
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0 0 moveto (TXygqPZ) false charpath
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pathbbox dup /baseline exch def
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exch pop exch sub /height exch def pop
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newpath
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% Translate coordinates first so that the origin is at the upper-left
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% corner of the text's bounding box. Remember that x and y for
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% positioning are still on the stack.
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translate
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lineLength xoffset mul
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strings length 1 sub spacing mul height add yoffset mul translate
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% Now use the baseline and justification information to translate so
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% that the origin is at the baseline and positioning point for the
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% first line of text.
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justify lineLength mul baseline neg translate
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% Iterate over each of the lines to output it. For each line,
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% compute its width again so it can be properly justified, then
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% display it.
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strings {
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dup stringwidth pop
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justify neg mul 0 moveto
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stipple {
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% The text is stippled, so turn it into a path and print
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% by calling StippledText, which in turn calls StippleFill.
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% Unfortunately, many Postscript interpreters will get
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% overflow errors if we try to do the whole string at
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% once, so do it a character at a time.
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gsave
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/char (X) def
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{
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char 0 3 -1 roll put
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currentpoint
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gsave
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char true charpath clip StippleText
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grestore
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char stringwidth translate
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moveto
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} forall
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grestore
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} {show} ifelse
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0 spacing neg translate
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} forall
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} bind def
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%%EndProlog
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