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-%%BeginProlog
-50 dict begin
-
-% This is a standard prolog for Postscript generated by Tk's canvas
-% widget.
-% RCS: @(#) $Id: prolog.ps,v 1.2 1999/04/16 01:51:09 stanton Exp $
-
-% 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