Added portable <slate> based automata demo to contrib

diff --git a/contrib/automata.factor b/contrib/automata.factor
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+! Copyright (C) 2006 Eduardo Cavazos.
+
+USING: parser kernel hashtables namespaces sequences math io
+math-contrib threads strings arrays prettyprint gadgets slate ;
+
+IN: automata
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+! set-rule
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+SYMBOL: rule
+
+: init-rule ( -- ) 8 <hashtable> rule set ;
+
+: rule-keys ( -- { ... } )
+{ { 0 0 0 }
+  { 0 0 1 }
+  { 0 1 0 }
+  { 0 1 1 }
+  { 1 0 0 }
+  { 1 0 1 }
+  { 1 1 0 }
+  { 1 1 1 } } ;
+
+: rule-values ( n -- { ... } ) >bin 8 CHAR: 0 pad-left >array [ 48 - ] map ;
+
+: set-rule ( n -- ) rule-values rule-keys [ rule get set-hash ] 2each ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+! step
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: 3nth ( n seq -- slice ) >r dup 3 + r> <slice> ;
+
+: next-chunk ( << slice: a b c >> -- value ) >array rule get hash ;
+
+: (step) ( line -- new-line )
+dup length 2 - [ swap 3nth next-chunk ] map-with ;
+
+: step-line ( line -- new-line ) >r { 0 } r> { 0 } append append (step) ;
+
+: last ( seq -- item ) dup length 1 - swap nth ;
+
+: step-line-wrapped ( line -- new-line )
+dup last 1array swap dup first 1array append append (step) ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+! Display the rule
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+DEFER: run-rule
+
+: test-automata ( -- )
+<slate> dup self set open-window init-rule 150 set-rule run-rule ;
+
+: random-line ( -- line ) window-width [ drop 2 random-int ] map ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+! show-line
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: show-point ( { x y } p -- ) 1 = [ draw-point ] [ drop ] if ;
+
+: (show-line) ( { x y } line -- )
+[ >r dup r> show-point { 1 0 } v+ ] each drop ;
+
+: show-line ( y line -- ) >r >r 0 r> 2array r> (show-line) yield ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+! Go
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+SYMBOL: last-line
+
+! : run-rule ( -- last-line ) clear-window
+! 0 random-line window-height [ drop 2dup show-line >r 1 + r> step-line ]
+! each last-line set drop ;
+
+: estimate-capacity ( -- ) window-width window-height * 1000 + capacity set ;
+
+: check-capacity ( -- )
+"capacity: " write capacity get number>string write terpri
+"dlist length: " write dlist get length number>string write terpri ;
+
+! : run-rule ( -- )
+! [ ] set-action
+! window-width window-height * 1000 + capacity set reset-dlist
+! white set-clear-color black set-color clear-window
+! 0 random-line window-height [ drop 2dup show-line >r 1 + r> step-line ] each
+! last-line set drop
+! "capacity: " print capacity get unparse print terpri
+! "dlist length: " print dlist get length unparse print terpri
+! flush-dlist slate-flush ;
+
+: run-rule ( -- )
+estimate-capacity reset-slate
+white set-clear-color black set-color clear-window
+0 random-line window-height [ drop 2dup show-line >r 1 + r> step-line ] each
+last-line set drop check-capacity flush-dlist flush-slate ;
+
+: run-rule-wrapped ( -- last-line )
+clear-window 0 random-line 400
+[ drop 2dup show-line >r 1 + r> step-line-wrapped ] each nip ;
+
+: continue-rule ( first-line -- last-line ) clear-window
+0 swap 400 [ drop 2dup show-line swap 1 + swap step-line ] each nip ;
+
+: continue-rule-wrapped ( first-line -- last-line ) clear-window
+0 swap 400 [ drop 2dup show-line swap 1 + swap step-line-wrapped ] each nip ;
+
+: random-gallery ( -- )
+255 random-int 1 + dup unparse print flush
+set-rule run-rule 5000 sleep random-gallery ;
+
+SYMBOL: interesting
+
+: init-interesting ( -- ) { 26 150 193 165 146 144 86 104 } interesting set ;
+
+: random-item ( seq -- item ) dup length random-int swap nth ;
+
+: random-interesting-gallery ( -- )
+interesting get random-item set-rule run-rule 10000 sleep
+random-interesting-gallery ;
+
+: automata ( -- )
+<slate> dup self set open-window init-interesting init-rule
+interesting get random-item set-rule 1000 sleep run-rule ;
+
+: automata-gallery ( -- )
+<slate> dup self set open-window 1000 sleep init-interesting init-rule
+random-interesting-gallery ;
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