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%!
% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% zeroline.ps
% Test file to determine how other PostScript implementations handle
% filling zero-width lines under a variety of conditions.

% Add a small "fan" of zero-width lines at different angles to the path.
/fan
 { currentpoint 100 0 rlineto
   2 copy moveto 100 20 rlineto
   2 copy moveto 100 100 rlineto
   2 copy moveto 20 100 rlineto
   moveto 0 100 rlineto
 } def

% Append a rectangle to the current path.
/rectappend
 { 4 -2 roll moveto 1 index 0 rlineto 0 exch rlineto
   neg 0 rlineto closepath
 } def
% Fill a rectangle.
/rectfill
 { gsave newpath rectappend fill grestore
 } def
% Stroke a rectangle.
/rectstroke
 { gsave newpath rectappend stroke grestore
 } def
% Clip to a rectangle.  Unlike the real rectclip,
% this clear the current path.
/rectclip
 { newpath rectappend clip newpath
 } def

40 40 translate

% Display fans of different colors on different backgrounds.
gsave
0 setgray
0 0 120 120 rectstroke
10 10 moveto fan fill
140 0 translate
0 setgray
0 0 120 120 rectstroke
0.8 setgray
10 10 moveto fan fill
140 0 translate
0 setgray
0 0 120 120 rectfill
1 setgray
10 10 moveto fan fill
grestore
0 140 translate

% Display rectangles with two edges coincident.
gsave
newpath
0 setgray
0 0 40 40 rectappend
0 0 20 20 rectappend
eofill
60 0 translate
0 0 40 40 rectappend
40 0 -20 20 rectappend
fill
grestore
0 60 translate

% Display superimposed lines.
gsave
/super
 { currentpoint fan
   2 copy moveto 20 0 rmoveto 50 0 rlineto
   2 copy moveto 20 4 rmoveto 50 10 rlineto
   2 copy moveto 20 20 rmoveto 50 50 rlineto
   2 copy moveto 4 20 rmoveto 10 50 rlineto
   moveto 0 20 rmoveto 0 50 rlineto
 } def
0 setgray
0 0 moveto super fill
140 0 translate 0 0 moveto super eofill
grestore
0 140 translate

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✏️ zeroline.ps