204 lines
6.2 KiB
PostScript
204 lines
6.2 KiB
PostScript
% This file contains the standard Postscript prolog used when
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% generating Postscript from canvas widgets.
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%
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% $Header: /user6/ouster/wish/library/RCS/prolog.ps,v 1.6 93/04/01 14:03:52 ouster Exp $ SPRITE (Berkeley);
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%%BeginProlog
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50 dict begin
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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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/maxwidth 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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/encoding {ISOLatin1Encoding} def
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% Override setfont to automatically encode the font in the style defined by
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% by 'encoding' (ISO Latin1 by default).
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systemdict /encodefont known {
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/realsetfont /setfont load def
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/setfont {
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encoding encodefont realsetfont
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} def
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} if
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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 filled StippleFill --
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%
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% Given a path and other graphics information already set up, this
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% procedure will fill the current path in a stippled fashion. "String"
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% contains a proper image description of the stipple pattern and
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% "width" and "height" give its dimensions. If "filled" is true then
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% it means that the area to be stippled is gotten by filling the
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% current path (e.g. the interior of a polygon); if it's false, the
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% area is gotten by stroking the current path (e.g. a wide line).
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% Each stipple dot is assumed to be about one unit across in the
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% current user coordinate system.
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/StippleFill {
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% Turn the path into a clip region that we can then cover with
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% lots of images corresponding to the stipple pattern. Warning:
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% some Postscript interpreters get errors during strokepath for
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% dashed lines. If this happens, turn off dashes and try again.
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1 index /tmpstip exch def %% Works around NeWSprint bug
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gsave
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{eoclip}
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{{strokepath} stopped {grestore gsave [] 0 setdash strokepath} if clip}
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ifelse
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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.
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pathbbox
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4 2 roll
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5 index div cvi 5 index mul 4 1 roll
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6 index div 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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grestore
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newpath
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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 stipimage 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.
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% stipimage - Image for stippling, if stipple is True.
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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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/stipimage exch def
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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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/maxwidth 0 def
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strings {
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stringwidth pop
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dup maxwidth gt {/maxwidth 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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maxwidth 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 maxwidth 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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show
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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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