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Overview
Comment:Fix the postscript generation to omit the creation date, so that we do not change the postscript on every rerun of the generator script. Change sql-stmt to unql-stmt. Add the all.wiki page.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: c6fdb1f6a7efd02d60bfc0f10df97b2ed4832ec7
User & Date: drh 2011-07-21 17:48:04
Context
2011-07-21
18:24
Internal changes to aggregate queries. check-in: 5fad391dbc user: dan tags: trunk
17:48
Fix the postscript generation to omit the creation date, so that we do not change the postscript on every rerun of the generator script. Change sql-stmt to unql-stmt. Add the all.wiki page. check-in: c6fdb1f6a7 user: drh tags: trunk
17:36
Candidate updates to the language syntax. Also add GIFs and postscript for all bubble diagrams to the check-in. check-in: f23e2c01b8 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Added doc/syntax/all.wiki. 





































































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<title>UnQL Syntax Summary</title><nowiki>
<h3>unql-stmt:</h3>
<img src="unql-stmt.gif">
<h3>select-stmt:</h3>
<img src="select-stmt.gif">
<h3>select-core:</h3>
<img src="select-core.gif">
<h3>data-source:</h3>
<img src="data-source.gif">
<h3>compound-operator:</h3>
<img src="compound-operator.gif">
<h3>create-collection-stmt:</h3>
<img src="create-collection-stmt.gif">
<h3>drop-collection-stmt:</h3>
<img src="drop-collection-stmt.gif">
<h3>insert-stmt:</h3>
<img src="insert-stmt.gif">
<h3>update-stmt:</h3>
<img src="update-stmt.gif">
<h3>delete-stmt:</h3>
<img src="delete-stmt.gif">
<h3>property:</h3>
<img src="property.gif">
<h3>expr:</h3>
<img src="expr.gif">
<h3>begin-stmt:</h3>
<img src="begin-stmt.gif">
<h3>commit-stmt:</h3>
<img src="commit-stmt.gif">
<h3>rollback-stmt:</h3>
<img src="rollback-stmt.gif">
<h3>pragma-stmt:</h3>
<img src="pragma-stmt.gif">

Changes to doc/syntax/begin-stmt.ps. 

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:07 2011
%%BoundingBox: 67 328 545 465
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
%%+ font Helvetica-Bold
%%EndComments





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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c

%%BoundingBox: 67 328 545 465
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
%%+ font Helvetica-Bold
%%EndComments

Changes to doc/syntax/bubble-generator-data.tcl. 

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#   bubble-generator-bnf.tcl
#

# Graphs:
#

set all_graphs {
  sql-stmt {
    line
      {or
         select-stmt
         create-collection-stmt
         drop-collection-stmt
         insert-stmt
         update-stmt








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#   bubble-generator-bnf.tcl
#

# Graphs:
#

set all_graphs {
  unql-stmt {
    line
      {or
         select-stmt
         create-collection-stmt
         drop-collection-stmt
         insert-stmt
         update-stmt

Changes to doc/syntax/bubble-generator.tcl. 

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  update
  .c postscript -file $name.ps -width [expr {$x1+2}] -height [expr {$y1+2}]
  global DPI
  exec convert -density ${DPI}x$DPI -antialias $name.ps $name.gif
  if {$do_xv} {
    exec xv $name.gif &
  }







}

proc draw_all_graphs {} {
  global all_graphs
  set f [open all.html w]

  foreach {name graph} $all_graphs {
    if {[regexp {^X-} $name]} continue
    puts $f "<h3>$name:</h3>"
    puts $f "<img src=\"$name.gif\">"
    draw_graph $name $graph 0
    set img($name) 1
    set children($name) {}








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  update
  .c postscript -file $name.ps -width [expr {$x1+2}] -height [expr {$y1+2}]
  global DPI
  exec convert -density ${DPI}x$DPI -antialias $name.ps $name.gif
  if {$do_xv} {
    exec xv $name.gif &
  }
  set in [open $name.ps r]
  set postscript [read $in]
  close $in
  regsub {\n%%CreationDate: [^\n]+\n} $postscript "\n" postscript
  set out [open $name.ps w]
  puts -nonewline $out $postscript
  close $out
}

proc draw_all_graphs {} {
  global all_graphs
  set f [open all.wiki w]
  puts $f "<title>UnQL Syntax Summary</title><nowiki>"
  foreach {name graph} $all_graphs {
    if {[regexp {^X-} $name]} continue
    puts $f "<h3>$name:</h3>"
    puts $f "<img src=\"$name.gif\">"
    draw_graph $name $graph 0
    set img($name) 1
    set children($name) {}

Changes to doc/syntax/commit-stmt.ps. 

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:08 2011
%%BoundingBox: 183 384 429 409
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
%%+ font Helvetica-Bold
%%EndComments





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%%Pages: 1
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%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%EndComments

Changes to doc/syntax/compound-operator.ps. 

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:06 2011
%%BoundingBox: 26 380 586 413
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%EndComments





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%!PS-Adobe-3.0 EPSF-3.0
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%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:06 2011
%%BoundingBox: 64 314 549 478
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%%EndComments

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:07 2011
%%BoundingBox: 19 364 594 428
%%Pages: 1
%%DocumentData: Clean7Bit
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%%DocumentNeededResources: font Helvetica
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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
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%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:06 2011
%%BoundingBox: 63 380 549 413
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%!PS-Adobe-3.0 EPSF-3.0
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%%CreationDate: Thu Jul 21 13:35:07 2011
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%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:06 2011
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%%Pages: 1
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%%DocumentNeededResources: font Helvetica
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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:08 2011
%%BoundingBox: 114 364 498 428
%%Pages: 1
%%DocumentData: Clean7Bit
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%%DocumentNeededResources: font Helvetica
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%%EndComments

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:07 2011
%%BoundingBox: 178 358 435 435
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%EndComments

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:08 2011
%%BoundingBox: 172 384 440 409
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%EndComments

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%!PS-Adobe-3.0 EPSF-3.0
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%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:05 2011
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%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
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%%EndComments

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%%Creator: Tk Canvas Widget
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%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:05 2011
%%BoundingBox: 143 302 469 490
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Deleted doc/syntax/sql-stmt.gif.

cannot compute difference between binary files

Deleted doc/syntax/sql-stmt.ps. 

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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%CreationDate: Thu Jul 21 13:35:05 2011
%%BoundingBox: 199 294 413 498
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
%%EndComments

%%BeginProlog
/CurrentEncoding [
/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/quotesingle
/parenleft/parenright/asterisk/plus/comma/hyphen/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
/grave/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
/space/space/space/space/space/space/space/space
/space/space/space/space/space/space/space/space
/space/exclamdown/cent/sterling/currency/yen/brokenbar/section
/dieresis/copyright/ordfeminine/guillemotleft/logicalnot/hyphen/registered/macron
/degree/plusminus/twosuperior/threesuperior/acute/mu/paragraph/periodcentered
/cedilla/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

50 dict begin
% This is a standard prolog for Postscript generated by Tk's canvas
% widget.
% RCS: @(#) $Id: mkpsenc.tcl,v 1.3 2002/07/19 14:37:21 drh 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


/cstringshow {
    {
	dup type /stringtype eq
	{ show } { glyphshow }
	ifelse
    }
    forall
} bind def



/cstringwidth {
    0 exch 0 exch
    {
	dup type /stringtype eq
	{ stringwidth } { 
	    currentfont /Encoding get exch 1 exch put (\001) stringwidth 
        }
	ifelse 
	exch 3 1 roll add 3 1 roll add exch
    }
    forall
} bind def

% font ISOEncode font
% This procedure changes the encoding of a font from the default
% Postscript encoding to current system encoding.  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 CurrentEncoding 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 {
	cstringwidth 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 cstringwidth 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
	    {
		dup type /stringtype eq {
		    % This segment is a string.
		    {
		        char 0 3 -1 roll put
		        currentpoint
		        gsave
		        char true charpath clip StippleText
		        grestore
		        char stringwidth translate
		        moveto
		    } forall
		} {
		    % This segment is glyph name
		    % Temporary override
		    currentfont /Encoding get exch 1 exch put
		    currentpoint
		    gsave (\001) true charpath clip StippleText
		    grestore
	            (\001) stringwidth translate
		    moveto
		} ifelse
	    } forall
	    grestore 
	} {cstringshow} ifelse
	0 spacing neg translate
    } forall
} bind def

%%EndProlog
%%BeginSetup
/CL 2 def
%%IncludeResource: font Helvetica
%%EndSetup

%%Page: 1 1
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matrix currentmatrix
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setmatrix
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stroke
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0.000 0.000 0.000 setrgbcolor AdjustColor
102 265 [
[(select-stmt)]
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[(create-collection-stmt)]
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[(drop-collection-stmt)]
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grestore
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100 97 [
[(begin-stmt)]
] 20 -0.5 0.5 0 false DrawText
grestore
gsave
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0.000 0.000 0.000 setrgbcolor AdjustColor
109 69 [
[(commit-stmt)]
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grestore
gsave
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[(rollback-stmt)]
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fill
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%!PS-Adobe-3.0 EPSF-3.0
%%Creator: Tk Canvas Widget
%%For: 
%%Title: Window .c
%%BoundingBox: 199 294 413 498
%%Pages: 1
%%DocumentData: Clean7Bit
%%Orientation: Portrait
%%DocumentNeededResources: font Helvetica
%%EndComments

%%BeginProlog
/CurrentEncoding [
/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/quotesingle
/parenleft/parenright/asterisk/plus/comma/hyphen/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
/grave/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
/space/space/space/space/space/space/space/space
/space/space/space/space/space/space/space/space
/space/exclamdown/cent/sterling/currency/yen/brokenbar/section
/dieresis/copyright/ordfeminine/guillemotleft/logicalnot/hyphen/registered/macron
/degree/plusminus/twosuperior/threesuperior/acute/mu/paragraph/periodcentered
/cedilla/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

50 dict begin
% This is a standard prolog for Postscript generated by Tk's canvas
% widget.
% RCS: @(#) $Id: mkpsenc.tcl,v 1.3 2002/07/19 14:37:21 drh 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


/cstringshow {
    {
	dup type /stringtype eq
	{ show } { glyphshow }
	ifelse
    }
    forall
} bind def



/cstringwidth {
    0 exch 0 exch
    {
	dup type /stringtype eq
	{ stringwidth } { 
	    currentfont /Encoding get exch 1 exch put (\001) stringwidth 
        }
	ifelse 
	exch 3 1 roll add 3 1 roll add exch
    }
    forall
} bind def

% font ISOEncode font
% This procedure changes the encoding of a font from the default
% Postscript encoding to current system encoding.  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 CurrentEncoding 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
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