%PDF-
%PDF-
Mini Shell
Mini Shell
%!
% vasarely
% Elizabeth D. Zwicky
% zwicky@sgi.com
%
% 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 def
/pageheight ury lly sub 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
Zerion Mini Shell 1.0