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//proc/self/root/usr/share/ghostscript/8.70/examples/vasarely.ps
%! % vasarely % Elizabeth D. Zwicky % zwicky@sgi.com /vasarelysave save def % prevent residual side effects % % Inspired by Vasarely's experiments with tilting circles and squares % (for instance "Tlinko" and "Betelgeuse" %% circles /part { circle } def /nnrand false def %% squares % /part { ngon } def /nn 4 def /nnrand false def %% random polygons % /part { ngon } def /nnrand true def %% random stars (not my favorite on this program) % /part { nstar } def /nnrand true def %% tilt the base shape a random amount? /twist false def % /twist true def /rainbow false def %% To make rainbows % /rainbow true def %% Set this to 1 to go through a full range of colors /rainrange .25 def % number of different designs per page /inheight 2 def /inwidth 2 def % number of repeats in a design /xtimes 10 def /ytimes 16 def %% This sets the relationship between the two hues: comptwo is maximum contrast /colorway {comptwo} def %% monochrome comptwo harmtwo harmfour freecolor compthree closeharm %% origcolor %% This sets the brightness and saturation of the colors; vivid makes %% them both bright /colorfam {vivid} def %% vivid jewel intense medium pastel free orig contrast %% medjewel medvivid vivpastel medpastel %% Only experts below this point! usertime srand /seed rand def /starcompensate false def /constroke 1 def /circle { /radius radius 1.33 mul def currentpoint /herey exch def /herex exch def herex herey radius 0 360 arc } def /ngon{ % polygon of n sides, n determined by nn nside 2 div radius rmoveto nn cvi { nside neg 0 rlineto 360 360 nn div sub neg rotate } repeat closepath } def /nstar{ % star of n points, n determined by nstarslider /radius radius 1.33 mul def currentpoint /herey exch def /herex exch def 0 radius rmoveto 90 nstarangle 2 div add neg rotate nn cvi {nstarside 0 rlineto 180 180 nstarangle 2 mul sub sub neg rotate nstarside 0 rlineto 180 180 360 nn div sub nstarangle 2 mul sub sub rotate } repeat 90 nstarangle 2 div add rotate closepath } def /nstarangle {180 360 nn div sub 3 div} def /nstarside { 2 radius 1 180 nn div sin div div mul nstarangle sin mul 180 nstarangle 2 mul sub sin div } def /nside { 2 radius 360 nn div 2 div tan mul mul } def /tan { /alpha exch def alpha sin 1 alpha sin dup mul sub sqrt div } def /pastel { /backbright high def /backsat medlow def /fillbright high def /fillsat medlow def /eobright high def /eosat medlow def constroke 0 eq { /strokebright high def /strokesat medlow def } { /strokebright low def /strokesat high def } ifelse } def /jewel { /fillbright med def /fillsat high def /backbright med def /backsat high def /eobright med def /eosat high def constroke 0 eq { /strokebright medlow def /strokesat high def } { /strokebright high def /strokesat medlow def } ifelse } def /vivid { /fillsat 1 def /fillbright high def /eosat 1 def /eobright high def /backsat 1 def /backbright high def constroke 0 eq { /strokesat 1 def /strokebright high def } { /strokesat high def /strokebright medlow def } ifelse } def /free { /fillsat anyrand def /fillbright anyrand def /eosat anyrand def /eobright anyrand def /backsat anyrand def /backbright anyrand def /strokesat anyrand def /strokebright anyrand def } def /contrast { /sat medhigh def /bright rand 2 mod 0 eq {medhigh} {medlow} ifelse def /backsat sat def /backbright bright def /eosat sat def /eobright 1 bright sub def /fillsat sat def /fillbright bright def /strokebright rand 2 mod def /strokesat rand 2 mod def } def /medium { /backsat med def /backbright med def /eosat med def /eobright med def /fillsat med def /fillbright med def /strokebright med def /strokesat med def } def /intense { /backsat high def /backbright med def /eosat high def /eobright high def /fillsat high def /fillbright med def /strokebright high def /strokesat high def } def /orig { /backsat rand 99 mod 55 add 100 div def /backbright rand 99 mod 35 add 100 div def /eosat rand 77 mod 22 add 100 div def /eobright 90 rand 75 mod sub 15 add 100 div def /fillsat 100 rand 90 mod sub 100 div def /fillbright 100 rand 45 mod sub 20 add 100 div def /strokebright 100 rand 55 mod sub 100 div def /strokesat 100 rand 85 mod sub 100 div def } def /medjewel { /alt rand 2 mod def /backsat alt 0 eq {high} { med} ifelse def /fillsat alt 0 eq {med} {high} ifelse def /eosat alt 0 eq {high} {med} ifelse def /backbright med def /fillbright med def /eobright med def constroke 0 eq { /strokebright medlow def /strokesat high def } { /strokebright high def /strokesat medlow def } ifelse } def /medvivid { /alt rand 2 mod def /backsat alt 0 eq {1} { med} ifelse def /fillsat alt 0 eq {med} {1} ifelse def /eosat alt 0 eq {1} {med} ifelse def /backbright alt 0 eq {high} {med} ifelse def /eobright alt 0 eq {high} {med} ifelse def /fillbright alt 0 eq {med} {high} ifelse def constroke 0 eq { /strokesat 1 def /strokebright high def } { /strokesat high def /strokebright medlow def } ifelse } def /vivpastel { /backlight rand 2 mod def /backsat backlight 0 eq {medlow} {1} ifelse def /eosat backlight 0 eq {medlow} {1} ifelse def /fillsat backlight 0 eq {1} {medlow} ifelse def /fillbright high def /backbright high def /eobright high def constroke 0 eq { /strokesat 1 def /strokebright high def } { /strokesat high def /strokebright medlow def } ifelse } def /medpastel { /alt rand 2 mod def /backsat alt 0 eq {medlow} {med} ifelse def /eosat alt 0 eq {medlow} {med} ifelse def /fillsat alt 0 eq {med} {medlow} ifelse def /fillbright alt 0 eq { high } {med} ifelse def /backbright alt 0 eq {med} { high } ifelse def /eobright alt 0 eq {med} { high } ifelse def constroke 0 eq { /strokebright high def /strokesat medlow def } { /strokebright low def /strokesat high def } ifelse } def /maxcon { rand 2 mod 1 eq { /backsat 0 def /backbright 0 def /eosat 0 def /eobright 0 def /fillsat 0 def /fillbright 1 def /strokebright 1 def /strokesat 0 def } { /backsat 0 def /backbright 1 def /eosat 0 def /eobright 1 def /fillsat 0 def /fillbright 0 def /strokebright 0 def /strokesat 0 def } ifelse } def /monochrome { /fillhue hue closevary def /strokehue hue closevary def /eohue hue closevary def /backhue hue def } def /blackandwhite { /fillhue 1 def /eohue 0 def /backhue 0 def /strokehue 1 def } def /freecolor { /fillhue anyrand def /strokehue anyrand def /eohue anyrand def /backhue anyrand def } def /purple { /fillhue rand 15 mod 80 add 100 div def /backhue rand 15 mod 80 add 100 div def /strokehue rand 15 mod 80 add 100 div def /eohue rand 15 mod 80 add 100 div def /backhue rand 15 mod 80 add 100 div def } def /comptwo { /fillhue hue closevary def /strokehue hue .5 add dup 1 gt {1 sub} if def /backhue strokehue def /eohue strokehue closevary def } def /compthree { /backhue hue def /strokehue hue 1 3 div add dup 1 gt {1 sub} if closevary def /fillhue strokehue closevary def /eohue hue 1 3 div sub dup 1 lt { 1 add} if closevary def } def /origcolor { /backhue hue def /strokehue hue 1000 mul cvi 3 mod dup 1 eq {hue closevary} {2 eq {rand 999 mod 1000 div} {hue .5 add dup 1 gt {1 sub} if } ifelse } ifelse def /fillhue hue 1000 mul cvi 3 mod dup 1 eq {hue closevary} {2 eq {rand 999 mod 1000 div} {hue .5 add dup 1 gt {1 sub} if } ifelse } ifelse def /eohue hue 1000 mul cvi 2 mod 1 eq {hue closevary} {rand 999 mod 1000 div} ifelse def } def /harmtwo { /fillhue hue closevary def /backhue hue def /strokehue hue .2 add dup 1 gt {1 sub} if closevary def /eohue strokehue closevary def } def /harmfour { /fillhue hue closevary def /backhue hue .1 add dup 1 gt {1 sub} if def /strokehue hue .2 add dup 1 gt {1 sub} if closevary def /eohue hue .1 sub dup 1 lt {1 add} if closevary def } def /closeharm { /fillhue hue def /backhue hue .05 add dup 1 gt {1 sub} if closevary def /strokehue hue .1 add dup 1 gt {1 sub} if closevary def /eohue hue .05 sub dup 0 lt {1 add} if closevary def } def /high {100 rand 25 mod sub 100 div } def /med { rand 33 mod 33 add 100 div } def /medhigh {100 rand 50 mod sub 100 div } def /medlow {rand 50 mod 100 div } def /low { rand 25 mod 100 div} def /anyrand { rand 100 mod 100 div } def /closevary {rand 70 mod rand 100 mod sub 1000 div add} def %rainbow % {/colorfill {fillhue 1 1 sethsbcolor fill} def} /colorfill {fillhue fillsat fillbright sethsbcolor fill } def %ifelse /colorstroke {strokehue strokesat strokebright sethsbcolor stroke } def /eocolorfill {eohue eosat eobright sethsbcolor eofill } def /backfill{ backhue backsat backbright sethsbcolor fill } def /xstep { xrange xtimes 1 sub div x 1 sub mul } def /ystep { yrange ytimes 1 sub div y 1 sub mul} def /functionarray [ {sin abs} {sin } {cos } {cos abs} {sin dup mul } {cos dup mul } {sin abs sqrt } {cos abs sqrt } ] def /range { /top exch def /bottom exch def /number exch def % number is between -1 and 1 /rangesize top bottom sub def number 1 add 2 div % number is now between 0 and 1 rangesize mul bottom add } def /drawone { /radius width height lt {width 3 div} {height 3 div} ifelse def seed srand 0 0 moveto /origmatrix [ 0 0 0 0 0 0 ] currentmatrix def [ % xstep function ystep function2 add .4 1.3 range 1 ystep function xstep function add -.25 .25 range ystep function3 xstep function2 add -.5 .5 range % xstep function4 ystep function mul .4 1.3 range 1 0 0 ] concat twist {twistdeg rotate} if part colorfill origmatrix setmatrix rainbow {/fillhue fillhue rainrange xtimes ytimes mul div add dup 1 gt {1 sub} if def} if } def /notdrawone { seed srand twist {/twistdeg rand 360 mod def} if nnrand {/nn rand 6 mod 3 add def} if /x1 rand width 3 div cvi mod width 8 div add def /y1 rand height 3 div cvi mod height 8 div add def rand 3 mod dup 1 eq {pop /x2 rand width 2 div cvi mod def /y2 rand height 2 div cvi mod def} { 2 eq {/x2 y1 def /y2 x1 def} {/x2 y1 width mul height div def /y2 x1 height mul width div def} ifelse } ifelse /radius width height gt {width} {height} ifelse 2.5 div def /stripe rand width 10 div cvi mod 2 add def starcompensate { /stripe stripe 2 mul def /radius radius 10 nn div mul def } if /i 1 def /repeats radius stripe div cvi 1 add def /nnincr 1 def repeats { colorvary {colorfam colorway} if /i i 1 add def /radius radius stripe sub def } repeat } def /page { clippath pathbbox /ury exch def /urx exch def /lly exch def /llx exch def /pagewidth urx llx sub 36 72 mul min def /pageheight ury lly sub 36 72 mul min def 0 0 moveto llx lly translate /outerwidth pagewidth inwidth div def /outerheight pageheight inheight div def /width outerwidth xtimes div def /height outerheight ytimes div def /size width height gt {width} {height} ifelse def inwidth { inheight { /seed rand def /hue rand 999 mod 1000 div def colorway colorfam /x 1 def /y 1 def nnrand {/nn rand 6 mod 3 add def} if /twistdeg rand 360 mod def /function functionarray rand functionarray length mod get def /function2 functionarray rand functionarray length mod get def /function3 functionarray rand functionarray length mod get def /function4 functionarray rand functionarray length mod get def /xrange [ 90 180 270 360 180 360 ] rand 6 mod get def /yrange [ 90 180 270 360 180 360 ] rand 6 mod get def initclip newpath 0 0 moveto outerwidth 0 rlineto 0 outerheight rlineto outerwidth neg 0 rlineto backfill xtimes { ytimes{ /y y 1 add def width 2 div height 2 div translate drawone width 2 div neg height 2 div neg translate 0 height translate } repeat /y 1 def /x x 1 add def width height ytimes mul neg translate } repeat width xtimes mul neg outerheight translate } repeat outerwidth outerheight inheight mul neg translate } repeat } def page showpage clear cleardictstack vasarelysave restore