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